SPC AC 010540
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1140 PM CST Mon Jan 31 2022
Valid 021200Z - 031200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Severe thunderstorms are not expected on Wednesday.
...Synopsis...
A large-scale mid/upper trough will extend from northern Manitoba to
the Lower CO Valley/northwest Mexico early Wednesday, becoming
oriented from Ontario to the central Plains and southern Rockies by
Thursday morning. A broad region of moderate mid/upper southwesterly
flow will extend from the southern Plains to the Midwest and
Northeast. At the surface, an arctic cold front will extend from
southeastern Lower MI to southeastern OK and central TX at the
beginning of the period. By Thursday morning, the front will extend
from western NY/PA to northern LA and the western Gulf of Mexico.
Warm advection ahead of the surface front and isentropic ascent will
allow for widespread precipitation across the south-central states
northward into the Midwest. Surface dewpoints in the 60s F will be
confined to south TX eastward into LA and southern MS/southwest AL.
However, upper forcing for ascent will remain nebulous as the upper
trough remains well to the west of the region. This will also result
in mainly neutral to only small height falls across south/east TX
into the central Gulf Coast vicinity, precluding stronger surface
cyclogenesis and limiting midlevel lapse rates. Poor diurnal heating
due to cloud cover and areas of precipitation will limit
destabilization for much of the period, though some guidance
suggests weak instability will develop inland across southern
LA/coastal MS by the last few hours of the period just ahead of the
cold front. While isolated thunderstorms will be possible from
coastal TX into parts of the lower MS Valley, overall severe
potential appears low given the lack of stronger forcing and poor
thermodynamics.
..Leitman.. 02/01/2022
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