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   Day 3 Convective Outlook   
   NWS Storm Prediction Center Norman OK   
   0227 AM CST Thu Dec 18 2025   
      
   Valid 201200Z - 211200Z   
      
   ...NO SEVERE THUNDERSTORM AREAS FORECAST...   
      
   ...SUMMARY...   
   Isolated thunderstorms are possible across western Washington and   
   far northwest Oregon on Saturday.   
      
   ...Synopsis...   
   A strong mid-level jet streak over the northern Plains Saturday   
   morning will move east as a mid-level trough amplifies across the   
   Great Lakes. As this occurs, a surface cold front will move from the   
   Plains Saturday morning to near the Appalachians and extending back   
   into East Texas by early Sunday morning.   
      
   ...East Texas into Louisiana...   
   Low-level moisture return will bring low to mid 60s dewpoints   
   northward across East Texas and Louisiana on Saturday and Saturday   
   evening. Weak to potentially moderate instability is forecast to   
   develop. However forcing will be minimal with rising heights aloft   
   and a weakening low-level jet. In addition, forecast soundings show   
   warm mid-level temperatures which will likely keep the airmass   
   capped. Therefore, thunderstorms are not expected across East Texas   
   and Louisiana on Saturday night/early Sunday.   
      
   ...Pacific Northwest..   
   Persistent onshore flow with cool temperatures aloft will result in   
   persistent convective activity across western Washington and   
   northwest Oregon on Saturday. Forecast soundings show weak   
   instability and equilibrium levels near or slightly above -20C which   
   may support some isolated thunderstorms.   
      
   ..Bentley.. 12/18/2025   
      
   $$   
      
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