SPC 1730Z Day 2 Outlook

Day 2 Outlook Image

Day 2 Convective Outlook  
NWS Storm Prediction Center Norman OK
1106 AM CST Mon Dec 21 2020

Valid 221200Z - 231200Z


Thunderstorms are not expected on Tuesday.


A progressive upper level pattern will bring a digging shortwave
trough eastward from the western U.S. to the Plains by the end of
the period. A surface low attendant to the trough will likely track
eastward along the international border near MT toward the upper
Great Lakes. A trailing cold front will push east/southeast across
the northern and central Plains during the afternoon and overnight
hours, with the front oriented from northeast MN into central OK and
northwest TX by Wednesday morning. Modest Gulf return flow is
expected ahead of the front, with dewpoints in the 50s F reaching as
far north as the Red River along the OK/TX border. 

Some shower activity is possible across parts of central into
northern TX after 06z in this warm advection regime. However,
moisture return is expected to be modest and even elevated
instability will be meager. While a lightning flash or two could
occur towards the very end of the forecast period, thunderstorms do
not appear likely before 12z Wednesday.

..Leitman.. 12/21/2020

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