Day 4-8 Outlook

Day 4-8 Convective Outlook  
NWS Storm Prediction Center Norman OK
0327 AM CST Fri Dec 18 2020

Valid 211200Z - 261200Z

...DISCUSSION...
Latest medium-range guidance is in relatively good agreement that
upper ridging over the western CONUS on D4/Monday will move eastward
across the central and eastern CONUS on D5/Tuesday and D6/Wednesday.
Deep upper troughing is expected to develop across the Plains on
D6/Wednesday in the wake of the upper ridging. Further deepening is
anticipated as this upper trough continues eastward over the eastern
CONUS on D7/Thursday.

A strong cold front is forecast to accompany this upper trough. This
front is currently expected to move through much of the Plains on
D5/Tuesday, the MS, TN, and OH Valleys on D6/Wednesday, and off the
East Coast D7/Thursday. Moisture return ahead of the upper trough
and attendant cold front is currently expected to be modest and
confined to central/east TX and the Lower MS Valley. This limited
moisture return will temper severe potential. However, subtle change
in timing could result in higher potential, particularly given the
anticipated strength of the system.

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