SPC 1730Z Day 2 Outlook

Day 2 Outlook Image

Day 2 Convective Outlook  
NWS Storm Prediction Center Norman OK
1112 AM CST Wed Jan 20 2021

Valid 211200Z - 221200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe weather is not expected across the U.S. on Thursday.

...Synopsis...

The upper low over the lower Colorado River Valley/northwest Mexico
will weaken and become an open wave as it progresses east/northeast
across New Mexico, and moves into the southern Plains overnight.
Cooling temperatures aloft near the compact low/shortwave trough
will result in steep midlevel lapse rates and enough instability to
support isolated lightning flashes near the Colorado Valley and into
southern AZ. 

Further east, a southern and northern stream jet over the TN
Valley/southern states and the Midwest will merge as a broad trough
envelopes the eastern half of the country. Modest cooling aloft as
the upper southwestern upper trough approaches during the evening
and nighttime hours will allow for modest instability across
portions of north TX into the lower MS Valley. A few lightning
flashes could accompany showers during the later half of the
forecast period.

..Leitman.. 01/20/2021

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