Subj : DAY1SVR: Day 1 Convective
To   : All
From : Mike Powell
Date : Fri Dec 29 2023 08:26:00

ACUS01 KWNS 291238
SWODY1
SPC AC 291237

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0637 AM CST Fri Dec 29 2023

Valid 291300Z - 301200Z

....NO SEVERE THUNDERSTORM AREAS FORECAST...

....SUMMARY...
Severe thunderstorms are not forecast through tonight across the
Lower 48 states.

....Synopsis...
Water-vapor imagery early this morning shows a potent mid- to
upper-level trough near -130 deg W moving east towards the West
Coast.  This large-scale trough will reach the CA coast by early
Saturday morning.  Cold-air advection in the mid levels associated
with the approaching trough and increased large-scale forcing for
ascent, will favor the development of showers and a few
thunderstorms moving ashore from Point Conception to southwest OR.
Pockets of scant instability will likely limit both thunderstorm
coverage/intensity.  Elsewhere across the contiguous U.S., surface
high pressure will influence conditions and be hostile for
thunderstorm activity.

...Smith/Marsh.. 12/29/2023

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