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    Day 2 Outlook >
Dec 12, 2017 2000 UTC Day 1 Convective Outlook
Updated: Tue Dec 12 19:31:24 UTC 2017 (Print Version | 20171212 2000Z Day 1 shapefile | 20171212 2000Z Day 1 KML)
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 Forecast Discussion
   SPC AC 121931

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0131 PM CST Tue Dec 12 2017

   Valid 122000Z - 131200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Isolated lightning strikes will be possible across parts of coastal
   Massachusetts and vicinity this afternoon and early evening.

   ...Discussion...
   No changes appear necessary with respect to the prior forecast, as a
   couple of lightning strikes may still occur over the southeast
   Massachusetts vicinity.

   Elsewhere, thunderstorms are not expected.

   ..Goss.. 12/12/2017

   .PREV DISCUSSION... /ISSUED 1020 AM CST Tue Dec 12 2017/

   ...Synopsis and Discussion...
   Large-scale upper troughing over the eastern CONUS will further
   amplify today as several embedded shortwave troughs rotate around
   its base. At the surface, a cold front will move eastward off the
   Atlantic coast by this evening as a low consolidates near coastal
   MA/NH. Preceding the front, low-level warm air advection should
   increase across coastal MA this afternoon, and recent NAM/RAP
   forecast soundings suggest MUCAPE up to 300 J/kg may be attained as
   mid-level lapse rates modestly steepen. Large-scale forcing for
   ascent will also strengthen across this region in the same time
   frame, and isolated lightning strikes may occur with the more robust
   elevated convection. These isolated thunderstorm chances will
   quickly diminish this evening as the cold front moves offshore.
   Dry/stable conditions will dominate across the rest of the CONUS
   today, with negligible thunderstorm potential evident.

   CLICK TO GET WUUS01 PTSDY1 PRODUCT

   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0100Z

        
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Page last modified: December 12, 2017
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