Severe Storms

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0316 AM CDT Thu Jul 10 2025 Valid 131200Z - 181200Z ...DISCUSSION... At the start of the forecast period, the mid-level pattern will generally be zonal across much country, with the greatest height gradient found across the northern United States. By the middle of next week, a short-wave trough moving within the broader flow regime will amplify the height field across the northern Rockies before moving into the central US. The overall pattern recognition would suggest the potential for at least isolated severe thunderstorms ahead of this feature across then northern Plains into the Upper Great Lakes. However, model run-to-run timing differences along with inter-model timing differences precludes the ability to identify 15% unconditional probabilities on any given day. Associated with the aforementioned mid-level trough, a surface-cold front will push south through much of the Plains and into the East. Additional thunderstorms will be likely along the front, however, the location of the front on any given day will be strongly influenced by previous days' convection. As such, when coupled with the uncertainty in the timing of any mid-level wave, predictability is too low to identify unconditional probabilities at this time. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0316 AM CDT Thu Jul 10 2025 Valid 131200Z - 181200Z ...DISCUSSION... At the start of the forecast period, the mid-level pattern will generally be zonal across much country, with the greatest height gradient found across the northern United States. By the middle of next week, a short-wave trough moving within the broader flow regime will amplify the height field across the northern Rockies before moving into the central US. The overall pattern recognition would suggest the potential for at least isolated severe thunderstorms ahead of this feature across then northern Plains into the Upper Great Lakes. However, model run-to-run timing differences along with inter-model timing differences precludes the ability to identify 15% unconditional probabilities on any given day. Associated with the aforementioned mid-level trough, a surface-cold front will push south through much of the Plains and into the East. Additional thunderstorms will be likely along the front, however, the location of the front on any given day will be strongly influenced by previous days' convection. As such, when coupled with the uncertainty in the timing of any mid-level wave, predictability is too low to identify unconditional probabilities at this time. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0316 AM CDT Thu Jul 10 2025 Valid 131200Z - 181200Z ...DISCUSSION... At the start of the forecast period, the mid-level pattern will generally be zonal across much country, with the greatest height gradient found across the northern United States. By the middle of next week, a short-wave trough moving within the broader flow regime will amplify the height field across the northern Rockies before moving into the central US. The overall pattern recognition would suggest the potential for at least isolated severe thunderstorms ahead of this feature across then northern Plains into the Upper Great Lakes. However, model run-to-run timing differences along with inter-model timing differences precludes the ability to identify 15% unconditional probabilities on any given day. Associated with the aforementioned mid-level trough, a surface-cold front will push south through much of the Plains and into the East. Additional thunderstorms will be likely along the front, however, the location of the front on any given day will be strongly influenced by previous days' convection. As such, when coupled with the uncertainty in the timing of any mid-level wave, predictability is too low to identify unconditional probabilities at this time. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0316 AM CDT Thu Jul 10 2025 Valid 131200Z - 181200Z ...DISCUSSION... At the start of the forecast period, the mid-level pattern will generally be zonal across much country, with the greatest height gradient found across the northern United States. By the middle of next week, a short-wave trough moving within the broader flow regime will amplify the height field across the northern Rockies before moving into the central US. The overall pattern recognition would suggest the potential for at least isolated severe thunderstorms ahead of this feature across then northern Plains into the Upper Great Lakes. However, model run-to-run timing differences along with inter-model timing differences precludes the ability to identify 15% unconditional probabilities on any given day. Associated with the aforementioned mid-level trough, a surface-cold front will push south through much of the Plains and into the East. Additional thunderstorms will be likely along the front, however, the location of the front on any given day will be strongly influenced by previous days' convection. As such, when coupled with the uncertainty in the timing of any mid-level wave, predictability is too low to identify unconditional probabilities at this time. Read more

MD 1625 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR EASTERN NE...WESTERN IA...SOUTHWEST MN...EXTREME NORTHEAST KS/NORTHWEST MO
Mesoscale Discussion 1625 NWS Storm Prediction Center Norman OK 0139 AM CDT Thu Jul 10 2025 Areas affected...Eastern NE...western IA...southwest MN...extreme northeast KS/northwest MO Concerning...Severe potential...Watch unlikely Valid 100639Z - 100845Z Probability of Watch Issuance...20 percent SUMMARY...Locally damaging wind and isolated hail remain possible overnight. DISCUSSION...A QLCS is ongoing early this morning from eastern NE into northwest IA and southwest MN. Recent measured gusts have generally been subsevere in the 40-45 kt range, and increasing MLCINH with time and decreasing deep-layer shear with eastward extent may tend to limit severe-wind potential somewhat. However, substantial buoyancy (MLCAPE of 1500-3000 J/kg) and a well-established cold pool could still support intensification of this QLCS on a localized basis, with isolated damaging gusts possible. Relatively steep midlevel lapse rates could also result in some hail potential with the stronger embedded cores, and also with more discrete development ahead of the primary convective line. ..Dean/Guyer.. 07/10/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...MPX...DMX...EAX...FSD...OAX...TOP...GID... LAT...LON 43949643 44109534 43989433 43149378 41589347 40669452 39779589 39799701 40239868 40399846 40579800 41299665 42199618 43229634 43949643 MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CDT Thu Jul 10 2025 Valid 121200Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS PORTIONS OF THE UPPER GREAT LAKES AND ACROSS THE CENTRAL AND SOUTHERN HIGH PLAINS SOUTHEAST TOWARD THE TEXAS HILL COUNTRY... ...SUMMARY... Marginally severe thunderstorms will be possible across portions of the Upper Great Lakes during much of the day on Saturday. Additional strong-to-severe thunderstorms will be possible across the central and southern High Plains southeastward toward the Texas Hill Country. ... Upper Great Lakes ... Multiple vorticity maxima will coalesce into a singular short-wave trough across the region on Saturday. This amalgamation of vorticity will take on an increasingly negative tilt as this feature moves through the basal region of a broad Canadian trough. As this occurs, the upper-level jet core downstream of the Canadian trough will strengthen, placing much of the Upper Great lakes within the right entrance region of the jet. Thus, multiple bands of strong to severe thunderstorms are expected to develop along and ahead of a surface cold front in response to this increasing large-scale ascent. Most-unstable CAPE values between 1000-2000 J/kg and effective-layer shear between 30-40 knots will support at least some potential for damaging thunderstorm winds. ... Central High Plains southeast toward the Texas Hill Country ... Thunderstorms will be ongoing across portions of the southern Great Plains throughout the forecast period along a stalled frontal boundary. Although an isolated severe thunderstorm cannot be ruled out along the frontal boundary, the greatest chance of organized severe thunderstorms will develop during the late afternoon across the higher terrain of central and southern Colorado. Here, moist upslope flow at the surface coupled with modest north-northwesterly flow aloft should aid in the development of an MCS during the afternoon and evening. This MCS should move south-southeast during the overnight hours across portions of the Oklahoma and Texas Panhandles eventually approaching the Texas Hill Country by the end of the forecast period. ..Marsh.. 07/10/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CDT Thu Jul 10 2025 Valid 121200Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS PORTIONS OF THE UPPER GREAT LAKES AND ACROSS THE CENTRAL AND SOUTHERN HIGH PLAINS SOUTHEAST TOWARD THE TEXAS HILL COUNTRY... ...SUMMARY... Marginally severe thunderstorms will be possible across portions of the Upper Great Lakes during much of the day on Saturday. Additional strong-to-severe thunderstorms will be possible across the central and southern High Plains southeastward toward the Texas Hill Country. ... Upper Great Lakes ... Multiple vorticity maxima will coalesce into a singular short-wave trough across the region on Saturday. This amalgamation of vorticity will take on an increasingly negative tilt as this feature moves through the basal region of a broad Canadian trough. As this occurs, the upper-level jet core downstream of the Canadian trough will strengthen, placing much of the Upper Great lakes within the right entrance region of the jet. Thus, multiple bands of strong to severe thunderstorms are expected to develop along and ahead of a surface cold front in response to this increasing large-scale ascent. Most-unstable CAPE values between 1000-2000 J/kg and effective-layer shear between 30-40 knots will support at least some potential for damaging thunderstorm winds. ... Central High Plains southeast toward the Texas Hill Country ... Thunderstorms will be ongoing across portions of the southern Great Plains throughout the forecast period along a stalled frontal boundary. Although an isolated severe thunderstorm cannot be ruled out along the frontal boundary, the greatest chance of organized severe thunderstorms will develop during the late afternoon across the higher terrain of central and southern Colorado. Here, moist upslope flow at the surface coupled with modest north-northwesterly flow aloft should aid in the development of an MCS during the afternoon and evening. This MCS should move south-southeast during the overnight hours across portions of the Oklahoma and Texas Panhandles eventually approaching the Texas Hill Country by the end of the forecast period. ..Marsh.. 07/10/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CDT Thu Jul 10 2025 Valid 121200Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS PORTIONS OF THE UPPER GREAT LAKES AND ACROSS THE CENTRAL AND SOUTHERN HIGH PLAINS SOUTHEAST TOWARD THE TEXAS HILL COUNTRY... ...SUMMARY... Marginally severe thunderstorms will be possible across portions of the Upper Great Lakes during much of the day on Saturday. Additional strong-to-severe thunderstorms will be possible across the central and southern High Plains southeastward toward the Texas Hill Country. ... Upper Great Lakes ... Multiple vorticity maxima will coalesce into a singular short-wave trough across the region on Saturday. This amalgamation of vorticity will take on an increasingly negative tilt as this feature moves through the basal region of a broad Canadian trough. As this occurs, the upper-level jet core downstream of the Canadian trough will strengthen, placing much of the Upper Great lakes within the right entrance region of the jet. Thus, multiple bands of strong to severe thunderstorms are expected to develop along and ahead of a surface cold front in response to this increasing large-scale ascent. Most-unstable CAPE values between 1000-2000 J/kg and effective-layer shear between 30-40 knots will support at least some potential for damaging thunderstorm winds. ... Central High Plains southeast toward the Texas Hill Country ... Thunderstorms will be ongoing across portions of the southern Great Plains throughout the forecast period along a stalled frontal boundary. Although an isolated severe thunderstorm cannot be ruled out along the frontal boundary, the greatest chance of organized severe thunderstorms will develop during the late afternoon across the higher terrain of central and southern Colorado. Here, moist upslope flow at the surface coupled with modest north-northwesterly flow aloft should aid in the development of an MCS during the afternoon and evening. This MCS should move south-southeast during the overnight hours across portions of the Oklahoma and Texas Panhandles eventually approaching the Texas Hill Country by the end of the forecast period. ..Marsh.. 07/10/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CDT Thu Jul 10 2025 Valid 121200Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS PORTIONS OF THE UPPER GREAT LAKES AND ACROSS THE CENTRAL AND SOUTHERN HIGH PLAINS SOUTHEAST TOWARD THE TEXAS HILL COUNTRY... ...SUMMARY... Marginally severe thunderstorms will be possible across portions of the Upper Great Lakes during much of the day on Saturday. Additional strong-to-severe thunderstorms will be possible across the central and southern High Plains southeastward toward the Texas Hill Country. ... Upper Great Lakes ... Multiple vorticity maxima will coalesce into a singular short-wave trough across the region on Saturday. This amalgamation of vorticity will take on an increasingly negative tilt as this feature moves through the basal region of a broad Canadian trough. As this occurs, the upper-level jet core downstream of the Canadian trough will strengthen, placing much of the Upper Great lakes within the right entrance region of the jet. Thus, multiple bands of strong to severe thunderstorms are expected to develop along and ahead of a surface cold front in response to this increasing large-scale ascent. Most-unstable CAPE values between 1000-2000 J/kg and effective-layer shear between 30-40 knots will support at least some potential for damaging thunderstorm winds. ... Central High Plains southeast toward the Texas Hill Country ... Thunderstorms will be ongoing across portions of the southern Great Plains throughout the forecast period along a stalled frontal boundary. Although an isolated severe thunderstorm cannot be ruled out along the frontal boundary, the greatest chance of organized severe thunderstorms will develop during the late afternoon across the higher terrain of central and southern Colorado. Here, moist upslope flow at the surface coupled with modest north-northwesterly flow aloft should aid in the development of an MCS during the afternoon and evening. This MCS should move south-southeast during the overnight hours across portions of the Oklahoma and Texas Panhandles eventually approaching the Texas Hill Country by the end of the forecast period. ..Marsh.. 07/10/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CDT Thu Jul 10 2025 Valid 121200Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS PORTIONS OF THE UPPER GREAT LAKES AND ACROSS THE CENTRAL AND SOUTHERN HIGH PLAINS SOUTHEAST TOWARD THE TEXAS HILL COUNTRY... ...SUMMARY... Marginally severe thunderstorms will be possible across portions of the Upper Great Lakes during much of the day on Saturday. Additional strong-to-severe thunderstorms will be possible across the central and southern High Plains southeastward toward the Texas Hill Country. ... Upper Great Lakes ... Multiple vorticity maxima will coalesce into a singular short-wave trough across the region on Saturday. This amalgamation of vorticity will take on an increasingly negative tilt as this feature moves through the basal region of a broad Canadian trough. As this occurs, the upper-level jet core downstream of the Canadian trough will strengthen, placing much of the Upper Great lakes within the right entrance region of the jet. Thus, multiple bands of strong to severe thunderstorms are expected to develop along and ahead of a surface cold front in response to this increasing large-scale ascent. Most-unstable CAPE values between 1000-2000 J/kg and effective-layer shear between 30-40 knots will support at least some potential for damaging thunderstorm winds. ... Central High Plains southeast toward the Texas Hill Country ... Thunderstorms will be ongoing across portions of the southern Great Plains throughout the forecast period along a stalled frontal boundary. Although an isolated severe thunderstorm cannot be ruled out along the frontal boundary, the greatest chance of organized severe thunderstorms will develop during the late afternoon across the higher terrain of central and southern Colorado. Here, moist upslope flow at the surface coupled with modest north-northwesterly flow aloft should aid in the development of an MCS during the afternoon and evening. This MCS should move south-southeast during the overnight hours across portions of the Oklahoma and Texas Panhandles eventually approaching the Texas Hill Country by the end of the forecast period. ..Marsh.. 07/10/2025 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0230 AM CDT Thu Jul 10 2025 Valid 121200Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS PORTIONS OF THE UPPER GREAT LAKES AND ACROSS THE CENTRAL AND SOUTHERN HIGH PLAINS SOUTHEAST TOWARD THE TEXAS HILL COUNTRY... ...SUMMARY... Marginally severe thunderstorms will be possible across portions of the Upper Great Lakes during much of the day on Saturday. Additional strong-to-severe thunderstorms will be possible across the central and southern High Plains southeastward toward the Texas Hill Country. ... Upper Great Lakes ... Multiple vorticity maxima will coalesce into a singular short-wave trough across the region on Saturday. This amalgamation of vorticity will take on an increasingly negative tilt as this feature moves through the basal region of a broad Canadian trough. As this occurs, the upper-level jet core downstream of the Canadian trough will strengthen, placing much of the Upper Great lakes within the right entrance region of the jet. Thus, multiple bands of strong to severe thunderstorms are expected to develop along and ahead of a surface cold front in response to this increasing large-scale ascent. Most-unstable CAPE values between 1000-2000 J/kg and effective-layer shear between 30-40 knots will support at least some potential for damaging thunderstorm winds. ... Central High Plains southeast toward the Texas Hill Country ... Thunderstorms will be ongoing across portions of the southern Great Plains throughout the forecast period along a stalled frontal boundary. Although an isolated severe thunderstorm cannot be ruled out along the frontal boundary, the greatest chance of organized severe thunderstorms will develop during the late afternoon across the higher terrain of central and southern Colorado. Here, moist upslope flow at the surface coupled with modest north-northwesterly flow aloft should aid in the development of an MCS during the afternoon and evening. This MCS should move south-southeast during the overnight hours across portions of the Oklahoma and Texas Panhandles eventually approaching the Texas Hill Country by the end of the forecast period. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Jul 10 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS TO NORTHWEST ILLINOIS... ...SUMMARY... Scattered severe thunderstorms are possible, mainly late afternoon and evening on Friday, from northeast Kansas to eastern Iowa and northwest Illinois. ... Central Great Plains to Midwest ... A positive-tilt trough will be moving across the northern Plains through the forecast period. To the south, a low-amplitude short-wave trough will be moving through the central Great Plains. At the same time, a diffuse/weak surface cold front will push east/southeast through the Plains. At the start of the forecast period one or more decaying MCSs should be ongoing across portions of Iowa perhaps into northern Illinois to perhaps as far east as lower Michigan. These MCSs could pose a residual risk for at least isolated wind damage through the morning. During the mid-to-late afternoon, additional thunderstorms are expected to develop in the wake of the morning convection. At this time guidance supports multiple initiation points across the area, the precise locations of which will be strongly influenced by the evolution of the morning convection. At this time, the most likely scenario is for initial thunderstorms to develop across southeast Iowa or northern Missouri along the residual outflow boundary from the morning convection. A second area of initiation is likely farther to the west along the diffuse surface cold front in Nebraska or northeast Kansas, perhaps extending northward into Minnesota. In both areas, strong instability may result in rapid thunderstorm development capable of producing strong wind and large hail. Given the degree of instability and an existing boundary, a tornado or two may also be possible, especially with initial thunderstorm development. With time, expectation is that these convective clusters will grow upscale as they move east and the primary severe threat should transition to severe wind gusts. ... High Plains ... Thunderstorms are expected to develop in the late afternoon. These storms will eventually grow upscale and move southeast toward the Great Plains. An isolated severe wind threat will be possible with any of these storms. ... Eastern US ... A warm, moist, weakly capped airmass will be in place across much of the east. Despite the absence of pronounced foci for initiation, widely scattered to scattered thunderstorms should develop during the late morning into the afternoon hours. Deep-layer shear should remain weak and precipitable water values will be lower than in preceding days. However, the potential will exist for scattered water-loaded downbursts capable of producing isolated wind damage. ..Marsh.. 07/10/2025 Read more

MD 1624 CONCERNING SEVERE THUNDERSTORM WATCH 500... FOR PORTIONS OF THE NORTHERN AND CENTRAL PLAINS
Mesoscale Discussion 1624 NWS Storm Prediction Center Norman OK 1118 PM CDT Wed Jul 09 2025 Areas affected...Portions of the northern and central Plains Concerning...Severe Thunderstorm Watch 500... Valid 100418Z - 100615Z The severe weather threat for Severe Thunderstorm Watch 500 continues. SUMMARY...Gusty winds will continue to be noted along the leading edge of squall line. DISCUSSION...Weak short-wave trough has topped the northern High Plains ridge and is now turning southeast across the eastern Dakotas. This feature appears to be partly responsible for a near 500 mi broken squall line that is propagating across the eastern portions of the northern and central Plains. Isolated severe wind gusts continue along the leading edge of this linear MCS, but much of this convection is producing sub-severe gusts. This activity should continue propagating through the remainder of ww500 with an attendant risk for at least isolated severe, and a local extension may be warranted. ..Darrow.. 07/10/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...MPX...FGF...FSD...OAX...ABR...GID... LAT...LON 40759925 42029784 43309760 44899762 47759768 47639675 45299645 42389643 40609759 40759925 MOST PROBABLE PEAK WIND GUST...55-70 MPH Read more