SPC AC 021728
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1228 PM CDT Tue Nov 02 2021
Valid 031200Z - 041200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Severe thunderstorms are not currently forecast across the
contiguous United States on Wednesday.
...Synopsis...
An upper-level trough over the upper Midwest Wednesday morning will
move southeast into the OH/TN Valley region, while expansive high
pressure aloft extends across much of the western U.S. with the
exception of the Pacific Northwest. There, a strong upper trough
will move onshore Wednesday night. A surface stationary front will
extend from central FL peninsula west across the northern Gulf of
Mexico into a weak surface low over southeast TX, and continue
farther west as a cold front across south TX. A cold front will move
onshore across the Pacific Northwest late Wednesday.
Weak elevated instability is anticipated north of the frontal
boundary over portions of west/central TX Wednesday, and showers and
thunderstorms are expected to develop/expand in coverage as an
impulse within the broadly cyclonic mid-level flow over the southern
high Plains moves southeast across the region and augments
larger-scale ascent. Additionally, forecast soundings show
sufficient instability (upwards of 1000-1500 J/kg) and minimal
convective inhibition within the near-frontal air mass, suggesting
surface-based thunderstorm development will be possible as the cold
front moves south. Substantial cloud-layer shear and modestly
impressive mid-level lapse rates of around 7 C/km may support small
hail with elevated storms north of the front, while any sustained
cluster of storms that develops near the front could produce gusty
winds.
..Bunting.. 11/02/2021
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