SPC Jan 20, 2026 1630 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1630Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0953 AM CST Tue Jan 20 2026

Valid 201630Z - 211200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not forecast across the U.S. today or tonight.

...Discussion...
A prominent longwave trough will remain entrenched from the Rockies
to the western Atlantic, with a general prevalence of cold/dry
continental trajectories and surface high pressure over the eastern
third of the CONUS. Airmass modification will occur with a modest
increase in low-level moisture toward coastal Texas tonight.
However, instability is expected to remain too limited to support
thunderstorms through tonight.

..Guyer/Lyons.. 01/20/2026


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SPC Jan 20, 2026 1300 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1300Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0648 AM CST Tue Jan 20 2026

Valid 201300Z - 211200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not forecast across the U.S. today or tonight.

...Synopsis and Discussion...
With large-scale upper troughing persisting over central/eastern
Canada and the CONUS today, expansive surface high pressure in place
across the MS/OH Valleys and eastern states will shift gradually
eastward as weak surface lee troughing/low development occurs across
the central High Plains. Modest low-level moisture will advance
slightly inland across parts of deep south into coastal/east TX, but
instability is expected to remain too limited to support
thunderstorms through the end of the period.

..Gleason/Dean.. 01/20/2026


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SPC Jan 20, 2026 0100 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 0100Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0653 PM CST Mon Jan 19 2026

Valid 200100Z - 201200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not forecast across the U.S. today or tonight.

...DISCUSSION...
A large-scale cyclonic flow pattern will remain in place across the
U.S. this evening and tonight. At the surface, a cold and dry
airmass within a large area of high pressure will be in place over
much of the nation. As a result, thunderstorms will not develop
across the continental U.S. through daybreak on Tuesday.

..Broyles.. 01/20/2026


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SPC Jan 19, 2026 2000 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 2000Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0125 PM CST Mon Jan 19 2026

Valid 192000Z - 201200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not expected across the U.S. today or tonight.

...Synopsis...
No changes.

..Squitieri.. 01/19/2026

.PREV DISCUSSION... /ISSUED 1025 AM CST Mon Jan 19 2026/

...Discussion...
Influenced by a longwave trough from the Rockies to the western
Atlantic, mostly offshore/continental low-level trajectories will be
hostile for thunderstorms across the CONUS.


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