SPC AC 270652
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1252 AM CST Wed Jan 27 2021
Valid 281200Z - 291200Z
...NO THUNDERSTORM AREAS FORECAST...
Severe weather is not expected across the U.S. Thursday.
Upper troughing/cyclonic flow will persist over the northeastern
U.S. Thursday, as one shorter-wavelength feature shifts eastward
into the western Atlantic, to be replaced by an upper low
progressing southeastward out of eastern Canada into the Northeast.
Meanwhile in the West, a sharp trough just off the West Coast will
gradually advance inland through the period. In between,
anticyclonic flow will prevail across a large portion of the central
At the surface, high pressure will prevail east of the Rockies,
though a rather pronounced lee trough over the high Plains is
expected. Meanwhile, a rather ill-defined cold front will move
across California toward the Great Basin and Desert Southwest.
With much of the country under the influence of a continental polar
airmass, little convective potential is evident. One exception will
be across portions of the West Coast states, as the upper trough
shifts inland. In addition to low-topped showers, cold air/steep
lapse rates aloft accompanying the trough could support a
few/sporadic lightning flashes -- particularly near the central
California coast late in the period. However, coverage at this time
appears likely to remain too sparse to warrant introduction of a 10%
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NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 1730Z