SPC 0830Z Day 3 Outlook

Day 3 Outlook Image

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0159 AM CST Sun Dec 20 2020

Valid 221200Z - 231200Z


Thunderstorms are not expected on Tuesday.

Shortwave ridging is anticipated to be in place over the central
CONUS early Tuesday, with shortwave troughs flanking on either side.
Overall pattern is expected to progress eastward with the western
CONUS shortwave trough moving east-southeastward while deepening.
This deepening may lead to bifurcation of the wave, with the
southern portion over the Four Corners region early Wednesday. 

At the surface, lee troughing is expected to deepen ahead of the
approaching shortwave trough. Surface cyclogenesis is anticipated
over the northern High Plains, with the resulting low moving
eastward across the northern Plains. Secondary cyclogenesis is
possible over the central High Plains late Tuesday night/early
Wednesday morning. By 12Z Wednesday, an expansive area of low
pressure encompassing both of these lows will cover much of the
Plains and MS Valley. 

A strong cold front attendant to these surface lows will sweep
across the northern and central Plains. However, low-level moisture
will be confined to central/south TX, and the resulting lack of
buoyancy will preclude thunderstorm development along the front.

..Mosier.. 12/20/2020

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