Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Fri Jun 09 2023 08:50:45

ACUS48 KWNS 090850
SWOD48
SPC AC 090849

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0349 AM CDT Fri Jun 09 2023

Valid 121200Z - 171200Z

....DISCUSSION...
Particularly in the northern mid-latitudes, models suggest that
mid/upper flow may remain more progressive across the Pacific into
western North America than east of the Mississippi Valley into the
Atlantic during this period.  Within the latter regime, it appears
that a couple of significant quasi-stationary to slow moving
mid-level lows will be maintained, including only a gradual
redevelopment of the trailing low east-northeast of the Great Lakes
through the coming work week.

Farther west, a weakening mid-level low over the southern Great
Basin at the outset of the period is forecast to continuing
weakening farther inland.  However, models suggest that a lingering
belt of seasonably strong mid-level flow may propagate around the
crest of mean mid-level ridging across and east of the southern
Rockies, while flow strengthens similarly on the southern periphery
of mean mid-level troughing across the Southeast.  Associated
strengthening of deep-layer shear along a quasi-stationary frontal
zone may become conducive to the evolution of organized
thunderstorm clusters on a daily basis.  However, the location and
extent of any associated severe weather hazards likely will remain
largely governed by sub-synoptic/mesoscale developments with poor
predictability in the extended time frame.

...Kerr.. 06/09/2023

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