SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0220 AM CDT Tue Sep 22 2020 Valid 241200Z - 251200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... 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 time. ...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 threat. ..Gleason.. 09/22/2020
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