SPC 1200Z Day 1 Outlook

Day 1 Outlook Image

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1113 PM CST Fri Dec 04 2020

Valid 051200Z - 061200Z


Severe thunderstorms are not expected across the conus through the
Day 1 forecast period.

A potent shortwave trough over the Delmarva peninsula is forecast to
intensify as it moves northeastward along the New England coast
through this afternoon. At the surface, a bomb cyclone will support
a broad shield of mixed/wintry precipitation across coastal New
England. A few lightning flashes may accompany embedded deeper
convection. A trailing cold front will extend southward across the
western Atlantic and into western Florida where a few diurnal
thunderstorms are possible.

Across the western US, a large mid-level anticyclone will be located
over the Great Basin. To its south, a cutoff low over northern
Mexico is forecast to slowly drift to the east. Modest mid-level
height falls from the approaching upper-low and a warm and moist air
mass near the Gulf of Mexico will support a few general
thunderstorms across coastal Texas.

..Lyons/Smith.. 12/05/2020

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