SPC AC 301639

   Day 2 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1039 AM CST Sat Dec 30 2017

   Valid 311200Z - 011200Z

   ...NO THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   The risk for thunderstorms appears negligible across the U.S.,
   Sunday through Sunday night.

   ...Synopsis...
   Upper pattern will transition towards a western CONUS ridge/eastern
   CONUS trough configuration during the period as a shortwave trough
   quickly traverses through OH Valley and upper Mid-Atlantic states
   and a polar airmass settles in east of the Rockies. Strong surface
   high (i.e. central pressure near 1055 mb during the afternoon)
   associated with the polar airmass will dominate sensible weather
   across the central and eastern CONUS. The only exception will be
   across the central Gulf of Mexico where a frontal low will track
   eastward throughout the day. Resultant interaction with a weakly
   unstable airmass may result in isolated lightning strikes. Cool,
   dry, and stable conditions are also anticipated west of the Rockies,
   keeping the lower 48 free of thunderstorms through early Monday
   morning.

   ..Mosier.. 12/30/2017

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   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0700Z