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   PID: Synchronet 3.21a-Linux master/123f2d28a Jul 12 2025 GCC 12.2.0   
   TID: SBBSecho 3.28-Linux master/123f2d28a Jul 12 2025 GCC 12.2.0   
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   SPC AC 250054   
      
   Day 1 Convective Outlook   
   NWS Storm Prediction Center Norman OK   
   0654 PM CST Wed Dec 24 2025   
      
   Valid 250100Z - 251200Z   
      
   ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG MUCH OF   
   THE CALIFORNIA COAST AND PORTIONS OF THE CENTRAL VALLEY...   
      
   ...SUMMARY...   
   An isolated risk for severe/damaging gusts and perhaps a brief   
   tornado will exist through tonight along much of the California   
   Coast and portions of the Central Valley.   
      
   ... 01Z Update ...   
      
   Multiple bands of convection look likely this evening into the early   
   morning hours as a deepening surface low approaches the California   
   coast. The strongest convective elements within this first band,   
   currently approaching the San Francisco Bay area, will be capable of   
   producing gusty winds as it moves inland.   
      
   Wind fields will strengthen overnight in response to the approaching   
   low. This will maintain sufficient low-level theta-e advection to   
   support modest low-level instability through Christmas morning.   
   Numerical guidance this evening indicates a more intense band of   
   convection will approach the central and northern California coast   
   in the 08-12Z (12-4AM PT) window, quickly moving into northern   
   portions of the Central Valley. Given the modest instability and   
   strong wind fields, isolated strong wind gusts and a brief tornado   
   will be possible overnight, especially along the coast.   
      
   Elsewhere along the California coast, low-level moist advection will   
   persist through the night supporting localized convective   
   development. For the same reasons listed above, an isolated strong   
   wind gust or brief tornado would be possible with these convective   
   elements.   
      
   ... Central Valley ...   
      
   Thunderstorms have developed this afternoon across portions of the   
   Central Valley near Sacramento. Surface-based instability around 500   
   J/kg within a strongly sheared environment will support an isolated   
   wind threat. Should convective elements become more cellular, the   
   low-level wind fields would support a brief tornado, especially in   
   areas where surface-based instability can be realized. This activity   
   will lift generally northward across the Central Valley through this   
   evening.   
      
   ..Marsh.. 12/25/2025   
      
   $$   
      
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