DAY 6 30% risk
Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0402 AM CST Thu Feb 27 2025
Valid 021200Z - 071200Z
...DISCUSSION... ...D6/Tue - East Texas into the Mid/Lower Mississippi Valley... A compact mid-level low will translate east across the Southwest on Sunday which will result in lee cyclogenesis in the southern/central High Plains. As surface high pressure across the Midwest translates east, favorable low-level trajectories and strengthening flow across the Gulf and southern Plains will initiate significant moisture return across Texas. The initial mid-level low will weaken as it moves across the Plains and into the Mid-Mississippi Valley on D5/Monday. However, lee cyclogenesis will likely strengthen Monday afternoon as a larger scale trough approaches the southern Plains. Shortwave ridging will likely keep the dryline capped on Monday with continued moistening beneath the capping inversion as low-level moisture advection continues.
By 12Z Tuesday, moisture recovery across the western Gulf should be complete with 70F dewpoints forecast near the Gulf Coast by both GFS and ECMWF ensembles. Confidence in the upper-level pattern is increasing as the ECMWF and EC Ensembles have been consistent with an amplified mid-level pattern across the central and southern Plains now for several consecutive runs. In addition, the GFS/GEFS has trended toward the more amplified ECMWF solution. As the confidence in the overall pattern increases, the confidence for a significant severe weather threat has also increased and 30% severe weather probabilities have been added from East Texas to central Mississippi. While specifics will remain uncertain until the event draws closer, the potential for multiple rounds of severe convection including supercells, clusters, and likely an eventual squall line will likely bring a threat for all severe weather hazards including strong tornadoes.
...D7/Wed - Carolinas into the Southeast... The ECMWF/ECS, which has been several days ahead of other extended guidance on with this upcoming pattern, has trended toward greater moisture penetration into the Southeast US and east of the Appalachians. Low to mid 60s dewpoints in the presence of a very strong wind field will support a large area of severe weather threat from the Southeast to the Carolinas and perhaps into parts of the Mid-Atlantic. Storm mode and specific hazards will be impacted by prior day convection and the overall evolution of the deepening surface low and associated cold front, but a great enough threat exists for 15% severe weather probabilities for D7/Wednesday.
Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0402 AM CST Thu Feb 27 2025
Valid 021200Z - 071200Z
...DISCUSSION... ...D6/Tue - East Texas into the Mid/Lower Mississippi Valley... A compact mid-level low will translate east across the Southwest on Sunday which will result in lee cyclogenesis in the southern/central High Plains. As surface high pressure across the Midwest translates east, favorable low-level trajectories and strengthening flow across the Gulf and southern Plains will initiate significant moisture return across Texas. The initial mid-level low will weaken as it moves across the Plains and into the Mid-Mississippi Valley on D5/Monday. However, lee cyclogenesis will likely strengthen Monday afternoon as a larger scale trough approaches the southern Plains. Shortwave ridging will likely keep the dryline capped on Monday with continued moistening beneath the capping inversion as low-level moisture advection continues.
By 12Z Tuesday, moisture recovery across the western Gulf should be complete with 70F dewpoints forecast near the Gulf Coast by both GFS and ECMWF ensembles. Confidence in the upper-level pattern is increasing as the ECMWF and EC Ensembles have been consistent with an amplified mid-level pattern across the central and southern Plains now for several consecutive runs. In addition, the GFS/GEFS has trended toward the more amplified ECMWF solution. As the confidence in the overall pattern increases, the confidence for a significant severe weather threat has also increased and 30% severe weather probabilities have been added from East Texas to central Mississippi. While specifics will remain uncertain until the event draws closer, the potential for multiple rounds of severe convection including supercells, clusters, and likely an eventual squall line will likely bring a threat for all severe weather hazards including strong tornadoes.
...D7/Wed - Carolinas into the Southeast... The ECMWF/ECS, which has been several days ahead of other extended guidance on with this upcoming pattern, has trended toward greater moisture penetration into the Southeast US and east of the Appalachians. Low to mid 60s dewpoints in the presence of a very strong wind field will support a large area of severe weather threat from the Southeast to the Carolinas and perhaps into parts of the Mid-Atlantic. Storm mode and specific hazards will be impacted by prior day convection and the overall evolution of the deepening surface low and associated cold front, but a great enough threat exists for 15% severe weather probabilities for D7/Wednesday.