Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sat Oct 28 2023 08:09:28

ACUS48 KWNS 280809
SWOD48
SPC AC 280807

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0307 AM CDT Sat Oct 28 2023

Valid 311200Z - 051200Z

....DISCUSSION...
At the outset of the period, a vigorous short wave trough of Arctic
origins appears likely to continue to dig through the middle
Mississippi/lower Ohio Valley vicinity, before turning eastward
toward the Atlantic Seaboard through mid week.  A reinforcing
intrusion of cold and/or dry air accompanying this feature likely
will overspread most areas east of the Rockies, and much of the Gulf
of Mexico, while cyclogenesis takes place offshore of the north
Atlantic Seaboard into the northwestern Atlantic.

Thereafter, later this week into next weekend, mid-level flow may
trend less amplified across the eastern Pacific into western North
America.  But at least broad ridging may prevail across and inland
of the Pacific coast, through the Rockies and Great Plains, with
downstream troughing east of the Mississippi Valley.  Beneath this
regime, an appreciable return flow of moisture appears unlikely,
with surface ridging perhaps being maintained across much of the
Gulf coast and north/western Gulf of Mexico, and little potential
for significant surface cyclogenesis to the lee of the southern
Rockies.  Generally stable conditions are likely to be maintained,
with negligible risk for severe thunderstorms.

...Kerr.. 10/28/2023

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