SPC Feb 27, 2025 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook

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.

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