SPC AC 200720

   Day 3 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0220 AM CDT Thu Sep 20 2018

   Valid 221200Z - 231200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Severe weather is not expected across the U.S. on Saturday.

   ...Synopsis...
   As an energetic short-wave trough within the fast belt of polar
   westerlies over the northern U.S. and Canada shifts across the
   Maritimes and into the northwest Atlantic, a second trough within
   this belt of flow will move inland across the Pacific Northwest. 
   South of the main belt of flow, a weak trough is progged to move
   slowly across the southern Plains region, while several weak
   disturbances move across the Ohio and Tennessee Valleys through the
   period.

   At the surface, the trailing portion of a cold front vacating the
   northeastern U.S. early in the period is forecast to remain
   quasi-stationary, stretching from the Mid-Atlantic region, across
   southern Appalachians, to the Arklatex area.  The main southward
   advance of the colder air north of this front should be limited to
   portions of Texas and Oklahoma, west of a weak low progged to drift
   very slowly eastward across the northeast/east Texas vicinity
   through the period.

   Scattered showers and thunderstorms are forecast along the
   quasi-stationary front, but with the boundary south of the belt of
   stronger flow aloft, little risk for severe weather is evident at
   this time.  Widespread convection is forecast across the
   south-central U.S. -- from eastern portions of the southern Plains
   into the lower Mississippi Valley -- ahead of the weak upper system.
   Here also, weak shear should preclude appreciable severe risk.

   ..Goss.. 09/20/2018

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