SPC AC 150819

   Day 3 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0219 AM CST Mon Jan 15 2018

   Valid 171200Z - 181200Z

   ...NO THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Thunderstorms are not expected across the U.S. Wednesday.

   ...Synopsis...
   Evolution toward a more progressive/lower-amplitude pattern aloft is
   expected Wednesday, as the eastern U.S. trough accelerates toward --
   and then off -- the East Cost overnight.  Meanwhile, weakly phased
   northern and southern-stream short-wave troughing will continue to
   cross the Rockies and eventually emerge into the Plains overnight,
   contributing to a continued suppression of background
   longer-wavelength ridging.  

   At the surface, high pressure will continue to prevail east of the
   Rockies.  The cool/stable boundary layer will again result in
   conditions unfavorable for thunderstorms over the eastern 2/3 of the
   country.  In the West, increasingly strong southwesterly flow aloft
   ahead of an upper low over the northeast Pacific will support
   upslope flow over the high terrain, and a corresponding increase in
   precipitation/convection through the second half of the period. 
   While sporadic/occasional lightning strikes may occur --
   particularly over western Washington late, coverage appears likely
   at this time to remain too sparse to warrant inclusion of a thunder
   area.

   ..Goss.. 01/15/2018

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