SPC 1730Z Day 2 Outlook

Day 2 Outlook Image

Day 2 Convective Outlook  
NWS Storm Prediction Center Norman OK
1110 AM CST Tue Jan 19 2021

Valid 201200Z - 211200Z


No severe storms are forecast across the continental United States
Wednesday or Wednesday night.


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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