RSS Mesoscale Discussions from Storm Prediction Center
SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1021 AM CST Wed Dec 10 2025
Valid 101630Z - 111200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are not forecast through tonight.
...Synopsis and Discussion...
A shortwave trough, and accompanying intense jet streak with 500 mb
winds over 100 kt, will continue eastward through the OH Valley
today and off the Northeast coast by early tomorrow. Surface low
associated with this wave will progress northeastward from its
current position over southeastern Lower MI/southwestern Ontario
along the St. Lawrence Valley today, continuing through ME and into
the Canadian Maritimes by early tomorrow. An extensive cold front
extending southeastward from this low will push quickly
eastward/southeastward through the southern Plains and much of the
eastern CONUS, ending the period well off the East Coast.
Passage of this cold front will reinforce the dry and stable
conditions across the majority of the CONUS, precluding
thunderstorms. Modest low-level moisture will remain over
central/southern FL throughout the day, but warm low to mid-level
temperatures will prohibit deep convection, limiting the
thunderstorm potential.
..Mosier/Moore.. 12/10/2025
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SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1052 AM CST Wed Dec 10 2025
Valid 111200Z - 121200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are not expected on Thursday.
...Synopsis...
A broad expanse of northwesterly flow aloft will stretch from the
Pacific Northwest to the Southeast on Thursday as an upper ridge
builds over the eastern Pacific and an upper trough moves offshore
the Atlantic coast. Prior surface cold frontal intrusions into the
Gulf will leave a dearth of boundary layer moisture east of the
Rockies. With a dry and stable boundary layer in place,
thunderstorms are not expected.
..Leitman.. 12/10/2025
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SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
1229 PM CST Wed Dec 10 2025
Valid 121200Z - 131200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are not expected on Friday.
...Synopsis...
An amplified upper ridge over the eastern Pacific will meander east
through the forecast period while broad upper troughing persists
across the eastern U.S. At the surface, a weak low over the Ohio
Valley Friday morning will move offshore the Mid-Atlantic coast late
Friday night/early Saturday morning. A trailing cold front will
develop south across TX and the Lower MS Valley. While modest
boundary layer moisture will reside across the TX coastal plain, any
appreciable instability will remain offshore over the western Gulf.
A few thunderstorms could occur late in the forecast period
offshore, but any lighting activity along the coast and immediately
inland should remain limited.
..Leitman.. 12/10/2025
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