SPC 1300Z Day 1 Outlook

Day 1 Outlook Image

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0650 AM CST Mon Dec 28 2020

Valid 281300Z - 291200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Isolated thunderstorms will remain possible across parts of southern
California through this evening.

...Southern California...
A band of precipitation that produced several lighting flashes
earlier this morning across parts of coastal southern CA will
continue to move inland today. Behind this initial activity,
additional showery convection will remain possible through much of
the day as strong ascent associated with an upper trough/low and
enhanced mid-level jet overspreads this region. Cooling mid-level
temperatures and steepening lapse rates should prove favorable for
occasional lighting flashes with weak instability. This lightning
potential is forecast to gradually shift southward across southern
CA through the afternoon and evening, before eventually diminishing
tonight as the upper trough/low moves inland across the Great Basin
and Southwest. Limited boundary-layer instability should preclude an
organized severe risk, but some small hail may occur given the cold
temperatures and steep lapse rates present aloft.

..Gleason.. 12/28/2020

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