SPC 0730Z Day 3 Outlook

Day 3 Outlook Image

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0218 AM CDT Wed Oct 21 2020

Valid 231200Z - 241200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected across the continental United
States Friday and Friday night.

...DISCUSSION...
A west-southwest mid-level flow pattern is forecast to be in place
from the Great Plains to Appalachians on Friday. At the surface, a
cold front will advance southeastward into the Ohio Valley, mid
Mississippi Valley and Ozarks. A narrow corridor of instability will
develop during the afternoon ahead of the front. Model forecasts
suggest that thunderstorms will be possible along and behind the
front where instability is forecast to be weak. Isolated
thunderstorms may also develop along the instability corridor ahead
of the front. However, deep-layer shear is forecast to remain weak
in most of the mid Mississippi and Ohio Valleys on Friday,
suggesting that the environment will not be sufficient for severe
storms.

Further southwest into the lower Mississippi Valley, isolated
thunderstorms may also develop during the mid to late afternoon.
Although adequate instability is forecast across parts of Louisiana
and Mississippi in the afternoon, 0-6 km shear should remain near or
below 30 kt suggesting a severe threat is not likely.

..Broyles.. 10/21/2020

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