SPC Feb 19, 2025 0100 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0647 PM CST Tue Feb 18 2025 Valid 190100Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN SOUTHEAST TX AND SOUTH LA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across south Louisiana tonight. Hail should be the primary hazard, but a brief tornado and localized severe gusts may occur along the immediate Louisiana Coast. ...Southeast TX and south LA... Overall forecast scenario appears to be evolving as anticipated. Elevated convection over southeast TX/southwest LA will have the best chance at producing marginally severe hail along the eastern periphery of steeper mid-level lapse rates, sampled upstream by the 00Z FWD sounding. An increasingly predominant cluster convective mode is anticipated with time tonight, limiting the hail threat amid weaker lapse rates with eastern extent across LA. Guidance continues a slightly southward trend to placement of the warm front overnight near the LA coast as weak surface cyclogenesis occurs in the northwest Gulf. With ongoing convection curtailing northward displacement of the stable surface air mass inland, these trends suggest the wind/tornado threats should remain spatially confined along the immediate coast near the MS River Delta. ..Grams.. 02/19/2025 Read more

SPC Feb 19, 2025 0100 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0647 PM CST Tue Feb 18 2025 Valid 190100Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN SOUTHEAST TX AND SOUTH LA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across south Louisiana tonight. Hail should be the primary hazard, but a brief tornado and localized severe gusts may occur along the immediate Louisiana Coast. ...Southeast TX and south LA... Overall forecast scenario appears to be evolving as anticipated. Elevated convection over southeast TX/southwest LA will have the best chance at producing marginally severe hail along the eastern periphery of steeper mid-level lapse rates, sampled upstream by the 00Z FWD sounding. An increasingly predominant cluster convective mode is anticipated with time tonight, limiting the hail threat amid weaker lapse rates with eastern extent across LA. Guidance continues a slightly southward trend to placement of the warm front overnight near the LA coast as weak surface cyclogenesis occurs in the northwest Gulf. With ongoing convection curtailing northward displacement of the stable surface air mass inland, these trends suggest the wind/tornado threats should remain spatially confined along the immediate coast near the MS River Delta. ..Grams.. 02/19/2025 Read more

SPC Feb 19, 2025 0100 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0647 PM CST Tue Feb 18 2025 Valid 190100Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN SOUTHEAST TX AND SOUTH LA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across south Louisiana tonight. Hail should be the primary hazard, but a brief tornado and localized severe gusts may occur along the immediate Louisiana Coast. ...Southeast TX and south LA... Overall forecast scenario appears to be evolving as anticipated. Elevated convection over southeast TX/southwest LA will have the best chance at producing marginally severe hail along the eastern periphery of steeper mid-level lapse rates, sampled upstream by the 00Z FWD sounding. An increasingly predominant cluster convective mode is anticipated with time tonight, limiting the hail threat amid weaker lapse rates with eastern extent across LA. Guidance continues a slightly southward trend to placement of the warm front overnight near the LA coast as weak surface cyclogenesis occurs in the northwest Gulf. With ongoing convection curtailing northward displacement of the stable surface air mass inland, these trends suggest the wind/tornado threats should remain spatially confined along the immediate coast near the MS River Delta. ..Grams.. 02/19/2025 Read more

SPC Feb 19, 2025 0100 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0647 PM CST Tue Feb 18 2025 Valid 190100Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN SOUTHEAST TX AND SOUTH LA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across south Louisiana tonight. Hail should be the primary hazard, but a brief tornado and localized severe gusts may occur along the immediate Louisiana Coast. ...Southeast TX and south LA... Overall forecast scenario appears to be evolving as anticipated. Elevated convection over southeast TX/southwest LA will have the best chance at producing marginally severe hail along the eastern periphery of steeper mid-level lapse rates, sampled upstream by the 00Z FWD sounding. An increasingly predominant cluster convective mode is anticipated with time tonight, limiting the hail threat amid weaker lapse rates with eastern extent across LA. Guidance continues a slightly southward trend to placement of the warm front overnight near the LA coast as weak surface cyclogenesis occurs in the northwest Gulf. With ongoing convection curtailing northward displacement of the stable surface air mass inland, these trends suggest the wind/tornado threats should remain spatially confined along the immediate coast near the MS River Delta. ..Grams.. 02/19/2025 Read more

SPC Feb 19, 2025 0100 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0647 PM CST Tue Feb 18 2025 Valid 190100Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN SOUTHEAST TX AND SOUTH LA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across south Louisiana tonight. Hail should be the primary hazard, but a brief tornado and localized severe gusts may occur along the immediate Louisiana Coast. ...Southeast TX and south LA... Overall forecast scenario appears to be evolving as anticipated. Elevated convection over southeast TX/southwest LA will have the best chance at producing marginally severe hail along the eastern periphery of steeper mid-level lapse rates, sampled upstream by the 00Z FWD sounding. An increasingly predominant cluster convective mode is anticipated with time tonight, limiting the hail threat amid weaker lapse rates with eastern extent across LA. Guidance continues a slightly southward trend to placement of the warm front overnight near the LA coast as weak surface cyclogenesis occurs in the northwest Gulf. With ongoing convection curtailing northward displacement of the stable surface air mass inland, these trends suggest the wind/tornado threats should remain spatially confined along the immediate coast near the MS River Delta. ..Grams.. 02/19/2025 Read more

SPC MD 114

5 months 3 weeks ago
MD 0114 CONCERNING HEAVY SNOW FOR PORTIONS OF SOUTHEASTERN KS...FAR NORTHEASTERN OK AND THE OZARK PLATEAU
Mesoscale Discussion 0114 NWS Storm Prediction Center Norman OK 1220 PM CST Tue Feb 18 2025 Areas affected...portions of southeastern KS...far northeastern OK and the Ozark Plateau Concerning...Heavy snow Valid 181820Z - 182345Z SUMMARY...Snowfall rates are expected to increase across portions of eastern KS and the Ozarks over the next few hours. Rates of 1-1.5 in/hr are expected within the heavier banding. DISCUSSION...As of 1820 UTC, regional radar and surface observations showed a broad area of winter precipitation ongoing over the Plains and beginning to shift eastward toward the Ozark Plateau. A pronounced band of heavier snow has slowly coalesced over the last couple of hours across portions of southeastern KS and northeastern OK. Likely supported by 850-700 mb frontogenesis and isentropic ascent, heavy snow with rates over 1" per hour have been observed. As ascent from the upstream shortwave trough continues to intensify, so to should the snow band as it gradually shifts eastward into parts of MO and northern AR. Hi-res model guidance and area RAP soundings generally agree with observational trends and suggest strengthening of the band is likely over the next several hours. Very cold low-level temperatures (teens to single digits) will support efficient dendrite generation with snow to liquid ratios in excess of 15:1. Confidence is highest that the heavier rates will occur generally along and south of I-44 across parts of northern AR and southern MO through this evening. ..Lyons.. 02/18/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...PAH...MEG...LSX...LZK...SGF...EAX...TSA...ICT... LAT...LON 38309384 38089168 37839048 37408956 37318946 36628951 36489018 36119161 36009271 36159440 36839512 37789510 38199456 38309384 Read more

SPC Feb 18, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

5 months 3 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0428 PM CST Tue Feb 18 2025 Valid 201200Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Discussion... In the wake of a cold front exiting the Florida Peninsula, strong surface high pressure (1040+ mb) and an Arctic air mass will settle over much of the CONUS on Thursday. Prevalent cold and stable conditions are expected to considerably limit thunderstorm potential. ..Guyer.. 02/18/2025 Read more

SPC Feb 18, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

5 months 3 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0428 PM CST Tue Feb 18 2025 Valid 201200Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Discussion... In the wake of a cold front exiting the Florida Peninsula, strong surface high pressure (1040+ mb) and an Arctic air mass will settle over much of the CONUS on Thursday. Prevalent cold and stable conditions are expected to considerably limit thunderstorm potential. ..Guyer.. 02/18/2025 Read more

SPC Feb 18, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

5 months 3 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0428 PM CST Tue Feb 18 2025 Valid 201200Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Discussion... In the wake of a cold front exiting the Florida Peninsula, strong surface high pressure (1040+ mb) and an Arctic air mass will settle over much of the CONUS on Thursday. Prevalent cold and stable conditions are expected to considerably limit thunderstorm potential. ..Guyer.. 02/18/2025 Read more

SPC Feb 18, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

5 months 3 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0428 PM CST Tue Feb 18 2025 Valid 201200Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Discussion... In the wake of a cold front exiting the Florida Peninsula, strong surface high pressure (1040+ mb) and an Arctic air mass will settle over much of the CONUS on Thursday. Prevalent cold and stable conditions are expected to considerably limit thunderstorm potential. ..Guyer.. 02/18/2025 Read more

SPC Feb 18, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

5 months 3 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0428 PM CST Tue Feb 18 2025 Valid 201200Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Discussion... In the wake of a cold front exiting the Florida Peninsula, strong surface high pressure (1040+ mb) and an Arctic air mass will settle over much of the CONUS on Thursday. Prevalent cold and stable conditions are expected to considerably limit thunderstorm potential. ..Guyer.. 02/18/2025 Read more

SPC Feb 18, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

5 months 3 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0428 PM CST Tue Feb 18 2025 Valid 201200Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Discussion... In the wake of a cold front exiting the Florida Peninsula, strong surface high pressure (1040+ mb) and an Arctic air mass will settle over much of the CONUS on Thursday. Prevalent cold and stable conditions are expected to considerably limit thunderstorm potential. ..Guyer.. 02/18/2025 Read more

SPC Feb 18, 2025 1930 UTC Day 3 Severe Thunderstorm Outlook

5 months 3 weeks ago
SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0428 PM CST Tue Feb 18 2025 Valid 201200Z - 211200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Discussion... In the wake of a cold front exiting the Florida Peninsula, strong surface high pressure (1040+ mb) and an Arctic air mass will settle over much of the CONUS on Thursday. Prevalent cold and stable conditions are expected to considerably limit thunderstorm potential. ..Guyer.. 02/18/2025 Read more

SPC Feb 18, 2025 2000 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook RESENT 2 NWS Storm Prediction Center Norman OK 0341 PM CST Tue Feb 18 2025 Valid 182000Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PARTS OF SOUTHEAST TEXAS INTO SOUTHERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across southern Louisiana tonight. Hail should be the primary hazard, but a brief tornado and occasional severe gusts may occur along the immediate Louisiana Coast. ...20Z Update... The previous forecast remains on track. Low-level warm-air and moisture advection are already underway across coastal portions of TX and LA, as indicated by 19Z mesoanalysis. Current thinking is that the low-level warm-air/moisture advection will continue to increase and boost elevated CAPE to 1000 J/kg along the coast with the approach of a mid-level impulse currently situated over NM. Elevated thunderstorms should develop later this evening. Mainly hail is expected given elongated hodographs. However, if any supercellular structure can materialize along the southeast LA coast and become rooted in the boundary layer tonight, a damaging gust or tornado cannot be ruled out. ..Squitieri.. 02/18/2025 .PREV DISCUSSION... /ISSUED 1029 AM CST Tue Feb 18 2025/ ...Southeast Texas into Southern Louisiana... Water-vapor imagery this morning shows a shortwave trough moving into northern AZ from the Great Basin. This upper feature will move east-southeast during the period reaching northern LA/southern AR by daybreak Wednesday. Surface analysis this morning delineates an arctic cold front from the Concho Valley northeastward into north TX. This boundary will continue to surge south-southeastward to the TX coast tonight. A modifying airmass over the northwest Gulf Basin will aid in destabilization this afternoon/evening over southeast TX. Thunderstorms should eventually form by this evening across parts of southeast TX as large-scale ascent increases. Forecast soundings continue to indicate this thunderstorm activity will likely remain elevated with around 1000 J/kg MUCAPE. This activity will spread eastward across portions of southern LA late this evening and overnight while posing mainly an isolated hail threat. The surface-based thunderstorm probabilities are greatest near the south-central and southeast LA coast. However, low-level lapse rates in a deep/saturated environment will be modest, likely limiting tornado potential. Nonetheless, if a couple of storms can become near-surface based in the coastal parishes, a risk for severe gusts may accompany the stronger storms. Read more

SPC Feb 18, 2025 2000 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook RESENT 2 NWS Storm Prediction Center Norman OK 0341 PM CST Tue Feb 18 2025 Valid 182000Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PARTS OF SOUTHEAST TEXAS INTO SOUTHERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across southern Louisiana tonight. Hail should be the primary hazard, but a brief tornado and occasional severe gusts may occur along the immediate Louisiana Coast. ...20Z Update... The previous forecast remains on track. Low-level warm-air and moisture advection are already underway across coastal portions of TX and LA, as indicated by 19Z mesoanalysis. Current thinking is that the low-level warm-air/moisture advection will continue to increase and boost elevated CAPE to 1000 J/kg along the coast with the approach of a mid-level impulse currently situated over NM. Elevated thunderstorms should develop later this evening. Mainly hail is expected given elongated hodographs. However, if any supercellular structure can materialize along the southeast LA coast and become rooted in the boundary layer tonight, a damaging gust or tornado cannot be ruled out. ..Squitieri.. 02/18/2025 .PREV DISCUSSION... /ISSUED 1029 AM CST Tue Feb 18 2025/ ...Southeast Texas into Southern Louisiana... Water-vapor imagery this morning shows a shortwave trough moving into northern AZ from the Great Basin. This upper feature will move east-southeast during the period reaching northern LA/southern AR by daybreak Wednesday. Surface analysis this morning delineates an arctic cold front from the Concho Valley northeastward into north TX. This boundary will continue to surge south-southeastward to the TX coast tonight. A modifying airmass over the northwest Gulf Basin will aid in destabilization this afternoon/evening over southeast TX. Thunderstorms should eventually form by this evening across parts of southeast TX as large-scale ascent increases. Forecast soundings continue to indicate this thunderstorm activity will likely remain elevated with around 1000 J/kg MUCAPE. This activity will spread eastward across portions of southern LA late this evening and overnight while posing mainly an isolated hail threat. The surface-based thunderstorm probabilities are greatest near the south-central and southeast LA coast. However, low-level lapse rates in a deep/saturated environment will be modest, likely limiting tornado potential. Nonetheless, if a couple of storms can become near-surface based in the coastal parishes, a risk for severe gusts may accompany the stronger storms. Read more

SPC Feb 18, 2025 2000 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook RESENT 2 NWS Storm Prediction Center Norman OK 0341 PM CST Tue Feb 18 2025 Valid 182000Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PARTS OF SOUTHEAST TEXAS INTO SOUTHERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across southern Louisiana tonight. Hail should be the primary hazard, but a brief tornado and occasional severe gusts may occur along the immediate Louisiana Coast. ...20Z Update... The previous forecast remains on track. Low-level warm-air and moisture advection are already underway across coastal portions of TX and LA, as indicated by 19Z mesoanalysis. Current thinking is that the low-level warm-air/moisture advection will continue to increase and boost elevated CAPE to 1000 J/kg along the coast with the approach of a mid-level impulse currently situated over NM. Elevated thunderstorms should develop later this evening. Mainly hail is expected given elongated hodographs. However, if any supercellular structure can materialize along the southeast LA coast and become rooted in the boundary layer tonight, a damaging gust or tornado cannot be ruled out. ..Squitieri.. 02/18/2025 .PREV DISCUSSION... /ISSUED 1029 AM CST Tue Feb 18 2025/ ...Southeast Texas into Southern Louisiana... Water-vapor imagery this morning shows a shortwave trough moving into northern AZ from the Great Basin. This upper feature will move east-southeast during the period reaching northern LA/southern AR by daybreak Wednesday. Surface analysis this morning delineates an arctic cold front from the Concho Valley northeastward into north TX. This boundary will continue to surge south-southeastward to the TX coast tonight. A modifying airmass over the northwest Gulf Basin will aid in destabilization this afternoon/evening over southeast TX. Thunderstorms should eventually form by this evening across parts of southeast TX as large-scale ascent increases. Forecast soundings continue to indicate this thunderstorm activity will likely remain elevated with around 1000 J/kg MUCAPE. This activity will spread eastward across portions of southern LA late this evening and overnight while posing mainly an isolated hail threat. The surface-based thunderstorm probabilities are greatest near the south-central and southeast LA coast. However, low-level lapse rates in a deep/saturated environment will be modest, likely limiting tornado potential. Nonetheless, if a couple of storms can become near-surface based in the coastal parishes, a risk for severe gusts may accompany the stronger storms. Read more

SPC Feb 18, 2025 2000 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook RESENT 2 NWS Storm Prediction Center Norman OK 0341 PM CST Tue Feb 18 2025 Valid 182000Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PARTS OF SOUTHEAST TEXAS INTO SOUTHERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across southern Louisiana tonight. Hail should be the primary hazard, but a brief tornado and occasional severe gusts may occur along the immediate Louisiana Coast. ...20Z Update... The previous forecast remains on track. Low-level warm-air and moisture advection are already underway across coastal portions of TX and LA, as indicated by 19Z mesoanalysis. Current thinking is that the low-level warm-air/moisture advection will continue to increase and boost elevated CAPE to 1000 J/kg along the coast with the approach of a mid-level impulse currently situated over NM. Elevated thunderstorms should develop later this evening. Mainly hail is expected given elongated hodographs. However, if any supercellular structure can materialize along the southeast LA coast and become rooted in the boundary layer tonight, a damaging gust or tornado cannot be ruled out. ..Squitieri.. 02/18/2025 .PREV DISCUSSION... /ISSUED 1029 AM CST Tue Feb 18 2025/ ...Southeast Texas into Southern Louisiana... Water-vapor imagery this morning shows a shortwave trough moving into northern AZ from the Great Basin. This upper feature will move east-southeast during the period reaching northern LA/southern AR by daybreak Wednesday. Surface analysis this morning delineates an arctic cold front from the Concho Valley northeastward into north TX. This boundary will continue to surge south-southeastward to the TX coast tonight. A modifying airmass over the northwest Gulf Basin will aid in destabilization this afternoon/evening over southeast TX. Thunderstorms should eventually form by this evening across parts of southeast TX as large-scale ascent increases. Forecast soundings continue to indicate this thunderstorm activity will likely remain elevated with around 1000 J/kg MUCAPE. This activity will spread eastward across portions of southern LA late this evening and overnight while posing mainly an isolated hail threat. The surface-based thunderstorm probabilities are greatest near the south-central and southeast LA coast. However, low-level lapse rates in a deep/saturated environment will be modest, likely limiting tornado potential. Nonetheless, if a couple of storms can become near-surface based in the coastal parishes, a risk for severe gusts may accompany the stronger storms. Read more

SPC Feb 18, 2025 2000 UTC Day 1 Convective Outlook

5 months 3 weeks ago
SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook RESENT 2 NWS Storm Prediction Center Norman OK 0341 PM CST Tue Feb 18 2025 Valid 182000Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PARTS OF SOUTHEAST TEXAS INTO SOUTHERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening across parts of southeast Texas, shifting across southern Louisiana tonight. Hail should be the primary hazard, but a brief tornado and occasional severe gusts may occur along the immediate Louisiana Coast. ...20Z Update... The previous forecast remains on track. Low-level warm-air and moisture advection are already underway across coastal portions of TX and LA, as indicated by 19Z mesoanalysis. Current thinking is that the low-level warm-air/moisture advection will continue to increase and boost elevated CAPE to 1000 J/kg along the coast with the approach of a mid-level impulse currently situated over NM. Elevated thunderstorms should develop later this evening. Mainly hail is expected given elongated hodographs. However, if any supercellular structure can materialize along the southeast LA coast and become rooted in the boundary layer tonight, a damaging gust or tornado cannot be ruled out. ..Squitieri.. 02/18/2025 .PREV DISCUSSION... /ISSUED 1029 AM CST Tue Feb 18 2025/ ...Southeast Texas into Southern Louisiana... Water-vapor imagery this morning shows a shortwave trough moving into northern AZ from the Great Basin. This upper feature will move east-southeast during the period reaching northern LA/southern AR by daybreak Wednesday. Surface analysis this morning delineates an arctic cold front from the Concho Valley northeastward into north TX. This boundary will continue to surge south-southeastward to the TX coast tonight. A modifying airmass over the northwest Gulf Basin will aid in destabilization this afternoon/evening over southeast TX. Thunderstorms should eventually form by this evening across parts of southeast TX as large-scale ascent increases. Forecast soundings continue to indicate this thunderstorm activity will likely remain elevated with around 1000 J/kg MUCAPE. This activity will spread eastward across portions of southern LA late this evening and overnight while posing mainly an isolated hail threat. The surface-based thunderstorm probabilities are greatest near the south-central and southeast LA coast. However, low-level lapse rates in a deep/saturated environment will be modest, likely limiting tornado potential. Nonetheless, if a couple of storms can become near-surface based in the coastal parishes, a risk for severe gusts may accompany the stronger storms. Read more