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Mesoscale Discussion 1107
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   MESOSCALE DISCUSSION 1107
   NWS STORM PREDICTION CENTER NORMAN OK
   0524 PM CDT SUN JUN 21 2015

   AREAS AFFECTED...ERN MT...WRN/CNTRL ND...NWRN SD

   CONCERNING...TORNADO WATCH 324...

   VALID 212224Z - 212330Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 324 CONTINUES.

   SUMMARY...ALL SVR HAZARDS REMAIN POSSIBLE ACROSS TORNADO WATCH 324.
   PARTS OF NWRN SD ARE BEING MONITORED FOR A NEW WATCH AS A SUPERCELL
   OVER ERN MT APPROACHES THE AREA.

   DISCUSSION...ISOLATED STRONG TO SVR STORMS ARE ONGOING ACROSS ERN MT
   INTO N-CNTRL ND...WITH THE MOST PROMINENT BEING A RIGHT-MOVING
   SUPERCELL OVER FALLON COUNTY MT. THIS STORM IS PROGRESSING SEWD AT
   AROUND 30 KT...AND EXTRAPOLATION OF CURRENT MOTION WOULD BRING IT
   INTO NWRN SD BY AROUND 00Z. AN ASSOCIATED THREAT OF VERY LARGE
   HAIL...DMGG WIND GUSTS...AND POSSIBLY A TORNADO...WILL EXIST AS LONG
   AS CURRENT INTENSITY IS MAINTAINED AS IT MOVES INTO A FAVORABLE
   ENVIRONMENT OVER NWRN SD...AND COULD REQUIRE ISSUANCE OF A NEW WW. 

   MEANWHILE...ONGOING CONVECTION ACROSS NERN MT INTO N-CNTRL ND
   APPEARS TO BE STRUGGLING TO MAINTAIN SVR INTENSITY ATTM.
   HOWEVER...RICHER MOISTURE IS ADVECTING NWD ACROSS CNTRL ND...AND THE
   ENVIRONMENT REMAINS FAVORABLE FOR AT LEAST INTERMITTENT LARGE HAIL
   AND STRONG WIND GUSTS...AND PERHAPS A TORNADO IF A DISCRETE
   SUPERCELL CAN EVOLVE.

   ..ROGERS/HART.. 06/21/2015


   ATTN...WFO...FGF...ABR...BIS...UNR...BYZ...GGW...

   LAT...LON   48899914 45779965 44390182 44470409 45720543 47770549
               48990517 48999934 48899914 

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Page last modified: June 21, 2015
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