SPC AC 221603

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1003 AM CST Sun Dec 22 2024

   Valid 221630Z - 231200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Severe thunderstorms are not forecast across the contiguous United
   States through tonight.

   ...Northern CA/Pacific Northwest coast through tonight...
   Lightning flashes have been observed this morning within a
   baroclinic band roughly 150 mi off the northern CA coast, in
   association with a midlevel shortwave trough that will move inland
   later today into tonight.  The potential for isolated lightning
   flashes inland will begin this afternoon with elevated convection in
   the warm conveyor belt across northwest CA/southwest OR.  Other
   isolated lightning flashes may also occur this evening into early
   tonight along the WA coast as steeper low-midlevel lapse rates and
   weak buoyancy spread inland.

   ..Thompson/Moore.. 12/22/2024

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   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 2000Z