SPC 0730Z Day 3 Outlook

Day 3 Outlook Image

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0220 AM CDT Tue Sep 22 2020

Valid 241200Z - 251200Z


The potential for severe thunderstorms Thursday across parts of
coastal southeastern Louisiana into southern Mississippi/Alabama
appears too limited to include any severe probabilities at this

...Synopsis and Discussion...
Tropical Cyclone Beta should weaken further on Thursday as it moves
northeastward and inland over the lower MS Valley and Southeast.
Beta should also be absorbed by a weak mid-level trough through the
period. Some guidance shows a more northward track of Beta's weak
surface reflection, and rich low-level moisture may advance
northward into parts of southeastern LA and southern MS/AL by
Thursday afternoon. At least weak destabilization may occur with
diurnal heating across these areas. Regardless, low and mid-level
flow are expected to remain fairly modest across the warm sector,
which should limit robust storm organization.

Elsewhere, isolated thunderstorms may occur across parts of the
Upper Midwest in association with a low-amplitude shortwave trough,
and across parts of the Pacific Northwest as a large-scale upper
trough continues eastward. Weak instability across both of these
regions are expected to preclude an organized severe thunderstorm

..Gleason.. 09/22/2020

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