Severe Storms

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0239 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... CORRECTED FOR NDFD FILL ERROR ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0239 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... CORRECTED FOR NDFD FILL ERROR ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0239 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... CORRECTED FOR NDFD FILL ERROR ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0239 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... CORRECTED FOR NDFD FILL ERROR ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0239 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... CORRECTED FOR NDFD FILL ERROR ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0239 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... CORRECTED FOR NDFD FILL ERROR ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0239 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... CORRECTED FOR NDFD FILL ERROR ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

MD 1659 CONCERNING SEVERE POTENTIAL...WATCH POSSIBLE FOR CENTRAL PA INTO PARTS OF NY AND EXTREME NORTHWEST VT
Mesoscale Discussion 1659 NWS Storm Prediction Center Norman OK 1223 PM CDT Sun Jul 13 2025 Areas affected...Central PA into parts of NY and extreme northwest VT Concerning...Severe potential...Watch possible Valid 131723Z - 132000Z Probability of Watch Issuance...40 percent SUMMARY...Storms capable of producing localized wind damage are possible this afternoon. DISCUSSION...Morning soundings from KALB and KBUF depicted very rich moisture, with PWs in the 1.8 - 2 inch range. Midlevel lapse rates are weak, but strong heating of this very moist airmass will result in MLCAPE increasing into the 1500-2500 J/kg range this afternoon. Scattered to numerous thunderstorms are expected to develop with time within the minimally capped environment. Generally weak effective shear (15-20 kt across PA/southern NY and 20-25 kt across northern NY) will tend to limit storm organization. However, steepening low-level lapse rates and large PW will support a threat of isolated wet microbursts and small outflow-dominant clusters capable of producing localized wind damage, especially where stronger pre-convective heating occurs. The need for a watch is uncertain due to the anticipated lack of storm organization, but watch issuance will become increasingly possible if observational trends begin to support areas of more concentrated wind-damage potential. ..Dean/Mosier.. 07/13/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BTV...ALY...BGM...BUF...CTP...PBZ... LAT...LON 43007429 40867699 39777744 39787832 39827896 40907914 41647932 42247918 42527870 42687845 43067773 43437624 44627554 44827545 45057454 44987296 44547318 43007429 MOST PROBABLE PEAK WIND GUST...55-70 MPH Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 PM CDT Sun Jul 13 2025 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE UPPER MIDWEST TO THE CENTRAL HIGH PLAINS AND ACROSS THE MID MISSISSIPPI VALLEY... ...SUMMARY... Isolated strong to severe thunderstorms are possible Tuesday afternoon and evening across portions of the central Plains to Upper Midwest and Mid Mississippi Valley. ...Northern/Central Plains to the Upper Midwest... A broad upper trough and multiple convectively enhanced shortwave perturbations moving out of southern Canada should move east/southeastward over the Northern Rockies Tuesday. A belt of enhanced mid-level flow (30-40 kt) will also spread eastward, overlapping with a sagging cold front from the western Great Lakes, across the northern Plains and into the Rockies. Along and south of the front, rich low-level moisture is expected with dewpoints in the upper 60s to low 70s F contributing to 2500-3000 J/kg of MLCAPE. Ascent from the approach trough and flow aloft will aid in deepening a lee low across the central High Plains at the junction of the front and a prominent lee trough. Convergence along these features, should support scattered thunderstorms Tuesday afternoon and evening. With deep-layer shear increasing to 30-35 kt, scattered thunderstorms organized into multicell clusters or supercell structures is possible along the cold front from the eastern Dakotas to the western Great Lakes and within the broader warm sector across southern SD to central NE. More isolated storms will also be possible along and east of the lee trough trailing the surface low to the south. Steep low mid-level lapse rates of 8+ C/km will be more than sufficient for isolated severe storms capable of damaging gusts and some hail. Consideration was given to higher severe probabilities given large forecast buoyancy and more focused forcing along the front/triple point. However, variability in the timing of the front and overnight convective influences at this range lend low confidence to any one solution. At least an isolated severe risk should also extend westward within the post-front upslope regime across far southern MT and into eastern WY and western SD. While buoyancy will be reduced, low-level moist advection and upslope flow behind the front will support isolated to widely scattered storms within enhanced mid-level flow. Hail and isolated damaging gusts are possible. ...Mid MS Valley... Multiple model solutions show a rather well-defined MCV moving out of the southern Plains and Ozarks into the mid MS Valley by Tuesday morning. A very warm and humid air mass will remain in place ahead of this feature supporting sufficient buoyancy for scattered thunderstorms. The exact placement and intensity of this feature remains very uncertain owing to different mesoscale solutions/convective influence in the coming days. Still, some enhancement of the low/mid-level flow field could support some organized clusters capable of damaging gusts. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 PM CDT Sun Jul 13 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN NEW ENGLAND TO THE MID ATLANTIC AND THE NORTHERN ROCKIES/PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains/Rockies and across the Mid Atlantic and Southern New England Monday. ...Mid Atlantic to southern New England... Weak troughing at the northern periphery of the subtropical ridge will shift northward across parts of the Northeast Monday. At the surface, a wind shift/weak front will move from the eastern Great Lakes into the upper OH/St Lawrence Valley by early afternoon. A very warm and humid air mass is in place east of the front with dewpoints in the 70s F expected. Despite some lingering cloud cover, diurnal heating should support moderate destabilization over much of the Northeast. Widespread thunderstorm activity is expected along and ahead of the surface boundary from northern VA into southern NY. Slight enhancement of the flow aloft to near 20 kt from the approaching shortwave could be enough to foster some longer-lived clusters with damaging gust potential from northern VA into southern NY. Elsewhere across the East, confidence in storm coverage/damaging wind potential is lower, but any stronger storms will remain cable of damaging outflow gusts from heavily water-loaded downdrafts. ...Northern Rockies and Plains... An upper trough, forecast to emanate from southern Canada, will move eastward over the northern Rockies/Plains Monday and Monday night. Ascent from this feature will overspread a weak cold front and lee trough/low, that will serve as a focus for scattered thunderstorms through afternoon and evening. Along the southern fringes of enhanced westerly flow aloft, a mix of multicells and transient supercells is expected. Modest surface moisture and deep boundary-layer mixing will support moderate buoyancy atop inverted-v structures favorable for damaging gusts and some hail with storms from northern WY into the western Dakotas. Late in the evening and into the overnight hours, low-level warm advection and continued ascent from the upper trough are expected to intensify along and north of the cold front from eastern MT into ND. A belt of strong mid-level flow (35-50 kt) will overlap with elevated destabilization north of the front. While not overly robust, sufficient buoyancy (MUCAPE ~1000 J/kg) and elongated hodographs should support a few organized elevated storms (including supercell structures) capable of isolated hail. ...Southeast States... A seasonably warm and moist air mass will again reside across much of the southeastern US beneath broad subtropical ridging aloft. Scattered to numerous storms expected Monday afternoon and evening amid strong diurnal heating and weak background ascent. With PWATs near or exceeding two inches and moderate buoyancy, a few stronger thunderstorm clusters may develop. With weak vertical shear below 15 kt, organized storms on a widespread basis are not expected. Still, sporadic damaging gusts from wet microbursts are possible. ..Lyons.. 07/13/2025 Read more