SPC AC 211727

   Day 2 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1227 PM CDT Wed Apr 21 2021

   Valid 221200Z - 231200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Severe thunderstorms are not expected across the United States on
   Thursday.

   ...Discussion...
   As an upper low over the eastern U.S. shifts eastward/northeastward
   into the western Atlantic/Canadian Maritime provinces, a trough
   consisting of phased northern- and southern-stream components is
   progged to advance across the West/Intermountain Region.

   As the upper system advances, cool air aloft/steepening lapse rates
   will support scattered showers, as well as some embedded lightning
   -- particularly during the diurnal peak heating period.  Lightning
   may occur over portions of the Northwest/Continental Divide area,
   and also across portions of the Four Corners states.

   Overnight, warm advection is expected to increase across the
   central/south-central states, as a low-level jet strengthens ahead
   of the advancing upper trough.  However, dry mid-level air atop
   moistening low levels would generally imply that convective
   development will remain unlikely through the end of the period
   across the area.  Near the very end of the period, convective
   potential may increase in the vicinity of the Arklatex, and so a
   conditional thunder area is being maintained there.  Otherwise,
   storm development is not expected through the end of the period.

   Elsewhere, showers and a thunderstorm or two may occur over south
   Florida and the Keys, mainly from afternoon onward.

   ..Goss.. 04/21/2021

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   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0600Z