Nov 30, 2017 0830 UTC Day 3 Severe Thunderstorm Outlook
Updated: Thu Nov 30 05:10:52 UTC 2017 (20171130 0830Z Day 3 shapefile | 20171130 0830Z Day 3 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Graphic
20171130 0830 UTC Day 3 Outlook Graphic
Day 3 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
Probabilistic Graphic
20171130 0830 UTC Day Probabilitic Graphic
Probability of severe weather within 25 miles of a point.
Hatched Area: 10% or greater probability of significant severe within 25 miles of a point.
Day 3 Prob. Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
   SPC AC 300510

   Day 3 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1110 PM CST Wed Nov 29 2017

   Valid 021200Z - 031200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   A few thunderstorms are possible across western Washington and
   Oregon on Saturday.

   ...Synopsis and Discussion...
   A shortwave trough with cold temperatures aloft and a cold front
   will move eastward across the northwestern states on Saturday. The
   presence of steep lapse rates aloft may support scattered showers, a
   few of which could produce lightning, along the WA/OR coasts during
   the day. Instability levels east of the Cascades appear too weak for
   any appreciable thunderstorm threat.  

   Elsewhere, a moistening air mass will approach the Texas coast late
   in the period with mid to upper 60s dewpoints, as a weak
   low-latitude wave provides cool temperatures aloft. However, any
   weak instability will remain capped, with thunderstorms unlikely. A
   large surface high will then maintain stable conditions across the
   remainder of the eastern CONUS.

   ..Jewell.. 11/30/2017

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   NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0830Z