849
ACUS01 KWNS 211259
SWODY1
SPC AC 211257

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0657 AM CST Fri Nov 21 2025

Valid 211300Z - 221200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM PARTS OF
MISSISSIPPI/ALABAMA INTO TENNESSEE AND SOUTHEAST KENTUCKY....

...SUMMARY...
Isolated strong to severe storms are possible later today into
tonight across parts of Mississippi and Tennessee into western and
northern Alabama.

...MS/AL/TN/KY...
Early morning water vapor imagery shows broad west-southwesterly
flow aloft extending from the southern Plains into the southeast
states.  A southern-stream shortwave trough is noted over LA/AR,
which will traverse across the mid-South and TN Valley today.
Multiple areas of precipitation will be present along/ahead of this
feature, with forecast soundings showing weak-but-sufficient CAPE
for a few thunderstorm clusters.  Mid-level lapse rates are weak,
suggesting most updrafts will struggle to intensify.  However,
forecast hodographs show strong low-level shear today from eastern
MS across parts of AL/Middle TN and southeast KY.  This could be
enough for one or two rotating cells capable of a tornado or
damaging wind event.  The overall threat appears marginal at this
time.

The primary surface cold front will move into this region after dark
tonight, with another round of showers and thunderstorms ahead of
the front.  Low-level winds are expected to somewhat veer by this
time, reducing low-level shear.  Nevertheless, a low risk of a
tornado or two and/or gusty winds will continue.

...Southern CA...
An upper low is centered off the coast of southern CA today, with
scattered showers and isolated thunderstorms ongoing.  This trend
will continue through the day, with some risk of a few robust
thunderstorms affecting coastal areas.  Onshore instability and
low-level shear are expected to remain weak, suggesting organized
severe storms are unlikely.

..Hart/Broyles.. 11/21/2025

$$