Subj : DAY3SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Tue Mar 18 2025 19:15:39

ACUS03 KWNS 181914
SWODY3
SPC AC 181913

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0213 PM CDT Tue Mar 18 2025

Valid 201200Z - 211200Z

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

....SUMMARY...
Thunderstorm development will be possible on Thursday from parts of
the Mid-Atlantic and northern Rockies. A severe threat is not
expected.

....Synopsis...
A progressive upper pattern will be in place over the CONUS on
Thursday, with a mid-level trough impinging on the West Coast as
another mid-level trough approaches the central Rockies and a third
upper trough ejects into the Atlantic. Though the central U.S.
trough will encourage strong lee troughing over the Plains, Gulf
moisture will be scoured from the previous departing trough and
associated surface cold front. Furthermore, surface high pressure
will overspread much of the eastern and western CONUS. The net
result will be widespread, stable conditions, with negligible
thunderstorm potential over much of the U.S., with two exceptions.

First, cold temperatures aloft and associated steep mid-level lapse
rates accompanying the aforementioned Rockies upper trough will
overspread portions of the northern Rockies, promoting enough lift
and buoyancy (albeit scant) to support a couple of lightning
flashes. Second, across the Mid Atlantic, just enough moisture to
foster marginal buoyancy ahead of a surface trough/cold front will
support isolated thunderstorm development before the cold front
moves offshore.

...Squitieri.. 03/18/2025

$$

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