SPC 0830Z Day 3 Outlook

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0214 AM CST Wed Dec 23 2020

Valid 251200Z - 261200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not expected on Friday.

...Synopsis...
A deep upper trough, with an embedded closed circulation over the
middle OH Valley, will cover the eastern CONUS early Friday morning.
Very strong flow aloft will surround this system as it gradually
moves eastward throughout the day. An associated surface low will
begin the period over eastern Ontario/southern Quebec. A cold front
will extend southeastward from this low to just off the southern New
England coast before arcing more southward. With the front already
offshore by early Friday morning and stable conditions in its wake,
no thunderstorms are expected across the central and eastern CONUS.

Farther west, upper ridging initially in place over the western
CONUS will gradually progress eastward as a shortwave trough
approaches the Pacific Northwest. Strong forcing for ascent and cold
temperatures aloft will accompany this shortwave, and a lightning
flash or two may occur in the deeper convection within the frontal
band offshore. However, any lightning is not expected to continue
once the band moves onshore.

..Mosier.. 12/23/2020

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