SPC AC 171704
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1104 AM CST Mon Jan 17 2022
Valid 181200Z - 191200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are not forecast across the contiguous United States
on Tuesday.
...Synopsis...
The overall upper pattern is forecast to trend gradually more
cyclonic on Tuesday as one upper trough progresses northeastward
into the western North Atlantic and a pair of shortwaves follow in
its wake. Northernmost of this pair of shortwaves is expected to
progress within the northern stream from the Canadian Prairie
Provinces southeastward into the Upper Midwest and adjacent
northwestern Ontario. Southernmost of this pair of shortwave will
likely move from its early period position over southern CA eastward
across the Southwest. By early Wednesday, broadly cyclonic upper
flow will cover the CONUS, with a belt of stronger flow within the
northern stream from the northern Rockies into the Northeast.
Dry and stable conditions are expected to be in place across the
CONUS early Tuesday. Surface ridging will be slow to progress
eastward across the Southeast, keeping conditions stable across the
region for the entire period. Surface cyclogenesis is anticipated
over the TX Panhandle ahead of the approaching southern-stream
shortwave trough. Strengthening surface pressure gradient and mass
response will encourage the northward return of modified low-level
moisture across central and east TX Tuesday afternoon through
Wednesday morning. Even so, warm mid-levels are forecast to keep
conditions stable, precluding thunderstorm development.
Elsewhere, cold mid-level temperatures within the shortwave trough
could result in a flash or two possible across AZ, but coverage will
be less than 10 percent. Thunderstorms are not expected elsewhere.
..Mosier.. 01/17/2022
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