Subj : DAY1SVR: Day 1 Convective Outlook
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Nov 21 2024 16:31:02

ACUS01 KWNS 211631
SWODY1
SPC AC 211629

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1029 AM CST Thu Nov 21 2024

Valid 211630Z - 221200Z

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

....SUMMARY...
Severe thunderstorms are not expected today and tonight.

....Synopsis...
A deep midlevel low, characterized by 500-mb temperatures around
-32C, will move from the Great Lakes into the Mid-Atlantic through
the period. These cold midlevel temperatures and strong height falls
accompanying the midlevel low may promote isolated lightning flashes
embedded in showers across the central Appalachians this afternoon.
Over coastal southern New England, low-level warm advection north of
a related occluded surface low will also support isolated
thunderstorms, given weak elevated instability. Most of this
activity should remain offshore. Isolated thunderstorms are also
possible over immediate coastal areas of WA, where forcing for
ascent in the left exit region of a jet streak is overlapping deep
tropospheric moisture/weak instability.

...Weinman.. 11/21/2024

$$

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