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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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   ACUS03 KWNS 090743   
   SWODY3   
   SPC AC 090742   
      
   Day 3 Convective Outlook   
   NWS Storm Prediction Center Norman OK   
   0142 AM CST Tue Dec 09 2025   
      
   Valid 111200Z - 121200Z   
      
   ...NO THUNDERSTORM AREAS FORECAST...   
      
   ...SUMMARY...   
   The risk for thunderstorms appears negligible across the U.S.   
   Thursday through Thursday night.   
      
   ...Discussion...   
   Downstream of an increasingly prominent, blocking high building near   
   and to the north of the Aleutians during this period, models   
   indicate that strong flow will take on an increasing northwesterly   
   component across southern British Columbia and adjacent portions of   
   the Pacific Northwest into portions of the Canadian Prairies and   
   northern U.S. Great Plains.  It appears that a significant short   
   wave trough near the leading edge of this regime will begin to   
   reinforce broad mid-level troughing extending downstream into the   
   western Atlantic.   
      
   While mid-level flow is likely to remain cyclonic as far south as   
   the Gulf Coast states into the southern mid- to subtropical   
   latitudes of the western Atlantic, heights across the south are   
   forecast to begin to rise, as a prominent perturbation accelerates   
   rapidly east-northeast of the lower Great Lakes region through the   
   Canadian Maritimes.   
      
   The primary surface front, trailing an evolving cyclone across the   
   Canadian Maritimes, may stall across the southern Atlantic coast   
   through Tennessee Valley, while progressing slowly southward through   
   the lower Missouri Valley and central Great Plains by late Thursday   
   night, in advance of much colder air beginning to nose southward to   
   the lee of the Canadian/northern U.S. Rockies.   
      
   As a remnant preceding front becomes more diffuse across the central   
   through northwestern Gulf Basin, Gulf boundary-layer modification   
   may gradually continue, as a weak southerly return flow begins to   
   develop across the Texas coast.  However, beneath relatively warm   
   and dry lower/mid-levels, it does not appears that this will   
   contribute to appreciable destabilization during this period.   
      
   ..Kerr.. 12/09/2025   
      
   $$   
      
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