Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sun Jun 08 2025 08:49:07

ACUS48 KWNS 080849
SWOD48
SPC AC 080847

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0347 AM CDT Sun Jun 08 2025

Valid 111200Z - 161200Z

....DISCUSSION...
Guidance trends remain supportive of a more active pattern across
the northern High Plains to the Upper Midwest. GEFS-based ML
guidance from SPC and NSSL are now highlighting multiple days with
mesoscale areas of 15 percent probabilities, mainly over the
northern High Plains. Western Gulf moisture will spread north and
encompass much of the central states through next weekend. Various
shortwave impulses ejecting into the Northwest may support multiple
bouts of mesoscale-driven severe potential downstream along the
northern periphery of the expansive Great Plains buoyancy plume. The
initial impulse that is expected to reach northern CA by 12Z
Wednesday has poor predictability with its downstream evolution into
the North-Central States.

Low-probability severe potential may persist for several days with a
minor southern-stream shortwave impulse drifting east from the
southern Great Plains. This could foster daily mesoscale corridors
with a severe threat, as modest shear overlaps plentiful buoyancy
initially over the South-Central States.

...Grams.. 06/08/2025

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