SPC 0830Z Day 3 Outlook

Day 3 Outlook Image

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0107 AM CST Wed Jan 20 2021

Valid 221200Z - 231200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
No severe weather is expected across the U.S. Friday.

...Discussion...
Substantial amplification of the large-scale pattern is expected
Friday, as the short-wave trough digging southeastward across the
northwestern U.S. at the start of the period strengthens with time. 
By the end of the period, broad/high-amplitude cyclonic flow will
prevail over the entire western U.S., with the positively tilted
trough axis extending from Montana to central California.

At the surface, high pressure will prevail east of the Rockies
through the period, while a cold front shifts across the
Southwest/southern Rockies through the period.

With dry/stable conditions prevailing east of the Rockies,
thunderstorms are not expected.  In the West, cold air/steep lapse
rates aloft -- associated with the upper trough -- will support
scattered/showery convection.  While a lightning flash or two cannot
be ruled out, any coverage would likely be less than 10%.

..Goss.. 01/20/2021

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