SPC 1730Z Day 2 Outlook

Day 2 Convective Outlook  
NWS Storm Prediction Center Norman OK
1112 AM CST Thu Jan 21 2021

Valid 221200Z - 231200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

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

...Synopsis...

An upper low and attendant trough near coastal northern CA at the
beginning of the period will pivot east/southeast through period,
emerging over the Great Basin and much of the rest of the southwest
U.S. by Saturday morning. Surface low pressure will develop over
parts of CA into NV, bringing a Pacific front east/southeast across
CA. Showers will accompany this system much of the period.
Steepening lapse rates due to cooling aloft should result in
sufficient instability to support a few thunderstorms around the San
Francisco area and surrounding hills.

Further east, broad, weak cyclonically-curved upper level flow will
dominate east of the Mississippi River. A weak mid/upper shortwave
trough over the southern Plains Friday morning will eject eastward
across the lower MS Valley during the afternoon, and weaken as it
continues east across the remainder of the Southeast. A weak surface
cold front will reside near the Gulf Coast during the morning and
slowly sag southward through Saturday morning. Showers and isolated
thunderstorms will likely be ongoing Friday morning and could
persist toward midday across parts of southern LA/MS. This activity
will exist in a weakly unstable environment with any thunderstorm
being undercut by the front, limiting any severe potential.

..Leitman.. 01/21/2021

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