SPC AC 141243
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0643 AM CST Fri Jan 14 2022
Valid 141300Z - 151200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
No thunderstorm areas are expected over the conterminous U.S.
through tonight.
...Synopsis/Discussion...
Mean mid/upper-level troughing will be maintained through the period
over about the eastern half of the CONUS. On its western fringes,
split flow will develop as a closed cyclone evolves from the phasing
process of two presently open shortwave troughs:
1. A perturbation now apparent in moisture-channel imagery over WY,
UT and NV. This will move southeastward across the Four Corners
region today, then be absorbed tonight into the strengthening
cyclonic-flow field of...
2. A shortwave trough now over southern MB, northwestern ND and
east-central MT, that will dig south-southeastward across the
northern/central Plains through 06Z, with a 500-mb low developing
over NE.
By 12Z tomorrow, the resulting, strengthening mid/upper cyclone
should be located over KS/OK, centered in the ICT/PNC area.
As a result, strong cyclogenesis/frontogenesis is expected today and
especially tonight over the central/southern Plains. By 12Z, a cold
front should arc from a frontal-wave low over western MO through
another low over northeast TX, then southwestward to northern
Coahuila. Intense large-scale forcing for ascent is expected within
an elevated warm-advection conveyor tonight, across the lower
Missouri Valley region and into the northern Ozarks by 12Z. While
this will support a growing field of precip (rain in southern parts,
mainly snow in the rest), and very isolated lightning cannot be
ruled out around the end of the period from midlevel convection in
the western Ozarks region, instability should remain too weak to
support a general thunder area. With post-cold-frontal,
continental/polar offshore flow in low levels now observed over the
northern Gulf, insufficient airmass modification will occur to
support thunderstorm potential farther south -- along the cold front
or in the warm sector -- until day 2.
..Edwards.. 01/14/2022
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