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Mesoscale Discussion 673
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   MESOSCALE DISCUSSION 0673
   NWS STORM PREDICTION CENTER NORMAN OK
   0916 PM CDT SAT MAY 21 2016

   AREAS AFFECTED...ERN WY...SERN MT

   CONCERNING...SEVERE THUNDERSTORM WATCH 189...

   VALID 220216Z - 220345Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 189
   CONTINUES.

   SUMMARY...ISOLATED HAIL THREAT AND STRONG WIND THREAT SHOULD
   GRADUALLY DECREASE THROUGH LATE EVENING ACROSS ERN WY AND SERN MT.

   DISCUSSION...A BROKEN LINE OF TSTMS PERSISTS FROM ERN MT SWD INTO
   E-CNTRL WY...WITH MORE RECENT TSTM DEVELOPMENT FOCUSED S OF WW 189
   NEAR/N OF THE LARAMIE MTNS OF WY. RADAR TRENDS SUGGEST THESE STORMS
   REMAIN CAPABLE OF PRODUCING ISOLATED SVR HAIL. LOW-LEVEL MOISTURE
   AXIS REMAINS CENTERED ACROSS ERN WY...BUT WILL GRADUALLY SHIFT EWD
   IN CONJUNCTION WITH AN INCREASING NOCTURNAL LLJ OVER WRN NEB AND THE
   WRN DAKOTAS. THIS...ALONG WITH CONTINUED BOUNDARY-LAYER COOLING...IS
   EXPECTED TO RESULT IN A GRADUAL DECREASE IN BOTH HAIL/WIND POTENTIAL
   THROUGH WATCH EXPIRATION TIME OF 06Z...BUT ISOLATED INSTANCES OF SVR
   HAIL AND STRONG WIND GUSTS STILL REMAIN POSSIBLE...PARTICULARLY WITH
   SUSTAINED DISCRETE STORMS ACROSS SRN PORTIONS OF WW 189 INTO E-CNTRL
   WY.

   ..ROGERS.. 05/22/2016


   ATTN...WFO...UNR...CYS...BYZ...RIW...

   LAT...LON   46280426 43870415 42440425 42080511 42100552 42450586
               43620574 44630629 45660608 46190576 46310506 46280426 

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