SPC 0730Z Day 3 Outlook
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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