SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1110 AM CST Tue Jan 19 2021 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... No severe storms are forecast across the continental United States Wednesday or Wednesday night. ...Synopsis... A series of shortwave troughs will migrate across the eastern U.S. on Wednesday; one pivoting across New England and offshore over the Atlantic, the second digging across the Midwest/Great Lakes region. This will maintain seasonally cool-to-cold temperatures east of the Mississippi River. Surface high pressure over the Southeast will limit poleward moisture return from the Gulf, and generally dry conditions will prevail despite a cold front traversing the northern/central Plains into the Great Lakes/Mid-MS Valley vicinity. Further west, a cut-off low offshore southern CA and northern Baja will begin to advance eastward by Wednesday afternoon, becoming positioned over the lower Colorado River Valley/northwest Mexico by Thursday morning. Strong southwesterly deep layer flow will transport adequate moisture northward ahead of the low into parts of far southern CA and southwest AZ. Cooling temperatures aloft will result in steepening lapse rates, and weak instability. This should be sufficient for isolated thunderstorm development by late morning into early Thursday. ..Leitman.. 01/19/2021
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