TZUTC: 0000   
   MSGID: 167688.weather@1:2320/105 2da9c356   
   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   
   BBSID: CAPCITY2   
   CHRS: ASCII 1   
   FORMAT: flowed   
   ACUS01 KWNS 170050   
   SWODY1   
   SPC AC 170048   
      
   Day 1 Convective Outlook   
   NWS Storm Prediction Center Norman OK   
   0648 PM CST Tue Dec 16 2025   
      
   Valid 170100Z - 171200Z   
      
   ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN THE PACIFIC   
   NORTHWEST...   
      
   ...SUMMARY...   
   Sporadic severe gusts may accompany low-topped convection across   
   parts of the Pacific Northwest tonight into early Wednesday morning.   
      
   ...Pacific Northwest...   
   A vigorous shortwave trough will reach coastal WA by late tonight   
   and spread inland through 12Z Wednesday. This trough will be   
   accompanied by an intense tropospheric wind field, characterized by   
   70-90 kts at 700 mb, that will spread across WA and OR during   
   06-12Z. A surface cyclone will move onshore in BC and occlude, as   
   downstream lee cyclogenesis occurs over southern AB.   
      
   Low-topped convection is expected to increase along the trailing   
   cold front attendant to the occluded cyclone, initially reaching   
   coastal WA towards 06Z. Surface-based buoyancy will be scant along   
   the front, but sporadic lightning flashes and occasional strong to   
   severe-caliber wind gusts may accompany the passage of this   
   low-topped convective line. Low-topped convection should also   
   increase ahead of this line overnight, as strong large-scale ascent   
   coincides with peak low to mid-level flow. With minimal instability,   
   low confidence exists in the degree of convective enhancement beyond   
   the gradient winds. Thus, the level 1-MRGL risk has been maintained   
   with no changes.   
      
   ..Grams.. 12/17/2025   
      
   $$   
      
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   --- SBBSecho 3.28-Linux   
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