SPC AC 171659

   Day 2 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1059 AM CST Sat Feb 17 2018

   Valid 181200Z - 191200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Thunderstorms are forecast to evolve Sunday evening/overnight from
   parts of the southern Plains into the lower Missouri/mid Mississippi
   Valleys.  Showers and embedded/sporadic lightning may also occur
   over parts of the Intermountain West.

   ...Synopsis...
   The mid- to upper-level pattern will begin to amplify on Sunday as a
   ridge strengthens across the eastern U.S. and a trough digs
   southward along the West Coast.  Surface low pressure will develop
   across the central High Plains in response to the western states'
   mid-level trough.  Southerly low-level flow will intensify from the
   TX coast north towards the Ozarks with a warm-air-advection regime
   continuing through the period across the southern Great Plains into
   the middle MS Valley.  Increasing moisture will aid in the
   development of showers and thunderstorms across the middle MS Valley
   Sunday night while more isolated activity is possible from AR/OK and
   into north-central TX early Monday morning.  Weak elevated
   instability will limit thunderstorm intensity.  Farther west, a few
   widely spaced thunderstorms are possible from interior WA/OR east to
   WY, but coverage will probably be less than 10 percent.

   ..Smith.. 02/17/2018

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