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The risk for thunderstorms appears negligible across the U.S. Tuesday through Tuesday night.
SPC AC 121825
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 1225 PM CST Sun Jan 12 2025
Valid 141200Z - 151200Z
NO THUNDERSTORM AREAS FORECAST
### SUMMARY
The risk for thunderstorms appears negligible across the U.S. Tuesday through Tuesday night.
Discussion
Models indicate that a blocking mid-level ridge will be maintained near the U.S. Pacific coast, and perhaps build a bit farther inland across the northern Great Basin during this period. To its south, a low is forecast to continue evolving, within mid-level troughing becoming increasingly detached from the mid-latitude westerlies. Although the NAM suggests that there may still be one modest embedded mid-level cold core (including 500 mb temperatures around -24 to -26 C) centered over interior southern California at 12Z Tuesday, a dry low-level environment appears likely to preclude any appreciable boundary-layer destabilization until it shifts well offshore of the coast late Tuesday into Tuesday night.
Downstream of this regime, across the Rockies through the Atlantic Seaboard, it appears that a series of digging short wave perturbations will begin to suppress initially prominent ridging centered over the Caribbean. As one lead impulse digs southeast of the Upper Midwest, across and east-southeast of the northern Mid Atlantic, cold surface ridging to the lee of the Rockies is forecast to continue building across the remainder of the southern Atlantic Seaboard and southeastern Gulf of Mexico. This will reinforce already entrenched dry and/or stable conditions.
..Kerr.. 01/12/2025
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