RSS Mesoscale Discussions from Storm Prediction Center
No watches are valid as of Thu Dec 4 08:48:02 UTC 2025.
No Mesoscale Discussions are in effect as of Thu Dec 4 08:48:02 UTC 2025.
SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1149 PM CST Wed Dec 03 2025
Valid 041200Z - 051200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Severe storms are not forecast in the U.S. today or tonight.
...DISCUSSION...
Across the U.S. today, mid-level flow will remain northwesterly in
the western states as a trough moves through the Great Plains.
West-southwesterly flow aloft will be in place across the Southeast.
At the surface, a moist airmass will be located over the western and
central Gulf. Isolated to scattered thunderstorms will be possible
along the northern edge of the moist airmass along parts of the
western and central Gulf Coast, and further north into the lower
Sabine and lower Mississippi River Valleys. Low-level moisture and
instability is expected to be insufficient for severe storms.
Elsewhere across the continental U.S., thunderstorms are not
forecast today or tonight.
..Broyles/Weinman.. 12/04/2025
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SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1254 AM CST Thu Dec 04 2025
Valid 051200Z - 061200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Severe storms are not forecast tomorrow (Friday) or Friday night.
...Synopsis...
Broad mid-level troughing will overspread much of the CONUS tomorrow
(Friday), prompting a surface trough to impinge on the Great Lakes
region while another surface low quickly develops along the northern
High Plains. Regardless of the synoptic weather pattern in place, a
relatively cool/dry, statically stable airmass will encompass much
of the Interior West, to the Plains states, eastward to the Atlantic
Seaboard. Therefore, thunderstorm development will be limited across
much of the CONUS. The one exception will be along the Gulf Coast.
Here, low-level moisture advection, prompted by an approaching upper
trough, will supply enough deep-layer ascent amid scant buoyancy
(e.g. a few hundred J/kg MUCAPE) for a few thunderstorms through
Friday.
..Squitieri.. 12/04/2025
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SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0212 AM CST Thu Dec 04 2025
Valid 061200Z - 071200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Isolated thunderstorms are possible along the Gulf Coast on
Saturday. Severe storms are not currently in the forecast.
...Synopsis...
A mid-level trough will traverse the Plains and impinge on the
Midwest on Saturday, prompting a surface low over the central High
Plains to translate southeastward toward the Gulf while weakening.
The approach of the weakening low will spur some low-level warm-air
advection and return flow along the Gulf shoreline. Buoyancy driven
by this moisture however, is forecast to be scant, so mainly
isolated thunderstorms are forecast, with severe thunderstorms
currently not a concern.
..Squitieri.. 12/04/2025
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Day 4-8 Outlook
Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0243 AM CST Thu Dec 04 2025
Valid 071200Z - 121200Z
...DISCUSSION...
A series of mid-level troughs will progress across the CONUS within
a broader west-northwesterly to east-southeasterly upper flow regime
next week. The orientation of the upper flow will support multiple
southeastward surges of cooler, statically stable air, and prevent
appreciable moisture return from the Gulf to the CONUS. An overall
quiescent severe weather pattern is predicted for the Days 4-8
period, though a few occasional rounds of isolated thunderstorms are
possible along the Gulf Coast, where at least scant moisture-driven
buoyancy may reside.
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