SPC 0830Z Day 3 Outlook

Day 3 Outlook Image

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0124 AM CST Tue Dec 15 2020

Valid 171200Z - 181200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
The risk for thunderstorm activity appears negligible across the
U.S., Thursday through Thursday night.

...Discussion...
A couple of branches of westerlies emanating from the mid-latitude
Pacific will maintain a considerable influence across southern
Canada and the U.S. during this period. These will remain generally
zonal, with a number of embedded, progressive short wave
perturbations.

In the wake of a significant surface cyclone migrating east of the
northern Atlantic Seaboard, a trailing cold front is forecast to
advance through the remainder of the southeastern Gulf of Mexico and
Florida Peninsula.  And boundary layer conditions over much of the
northern Gulf of Mexico will remain relatively cool and dry.

Short wave troughs progressing east of the Canadian Rockies, and
across the U.S. Rockies, likely will contribute to surface
cyclogenesis across the Canadian Prairies, with deepening surface
troughing as far south as the southern Great Plains.  While this
will be accompanied by a strengthening southerly low-level jet from
the Texas South Plains into Minnesota by late Thursday night, there
appears negligible potential for appreciable low-level moistening or
destabilization.

..Kerr.. 12/15/2020

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