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Mesoscale Discussion 860
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   MESOSCALE DISCUSSION 0860
   NWS STORM PREDICTION CENTER NORMAN OK
   0745 PM CDT MON JUN 01 2015

   AREAS AFFECTED...CENTRAL/SOUTHERN MONTANA...NORTHWESTERN
   WYOMING...SOUTHEASTERN IDAHO...AND FAR NORTHERN UTAH

   CONCERNING...SEVERE THUNDERSTORM WATCH 245...246...

   VALID 020045Z - 020145Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   245...246...CONTINUES.

   SUMMARY...SEVERE THREAT CONTINUES FOR WWS 245 AND 246...ALTHOUGH
   LARGE PARTS OF THE WATCH AREAS HAVE STABILIZED DUE TO PREVIOUS
   CONVECTIVE OVERTURNING.

   DISCUSSION...A BROKEN LINE OF STRONG TO OCCASIONALLY SEVERE STORMS
   CONTINUES ACROSS PARTS OF CENTRAL/SOUTHERN MONTANA AND NORTHWESTERN
   WYOMING...WITH A COUPLE OF SUPERCELL STRUCTURES NOTED NEAR MEAGHER
   AND WHEATLAND COUNTIES IN MONTANA WITHIN THE PAST HOUR. THE SEVERE
   THREAT WILL PERSIST ACROSS THESE AREAS...MAINLY WITH STORMS ALONG
   LEADING EDGE OF EWD-MOVING MATURE COLD POOL GIVEN SUPPORTIVE
   SHEAR/INSTABILITY IN AREAS IMMEDIATELY DOWNSTREAM. A GRADUAL
   DECREASE IN SEVERITY OF STORMS MAY OCCUR IN NORTHWESTERN WYOMING IN
   THE WAKE OF PREVIOUS CONVECTION THAT STABILIZED THAT AREA...BUT A
   RECENT 45 KNOT WIND GUST AT KJAC SUGGESTS THAT A SEVERE THREAT WILL
   STILL REMAIN ON AT LEAST AN ISOLATED BASIS. 

   FARTHER TO THE SOUTHWEST...A COUPLE OF ISOLATED STORMS MAY AFFECT
   AREAS NEAR CASSIA COUNTY IDAHO OVER THE NEXT 1-2 HOURS...ALTHOUGH
   AREAS NORTHEAST OF THESE STORMS HAVE STABILIZED DUE TO OVERTURNING
   FROM PREVIOUS CONVECTION. MUCH OF WW 246 MAY BE CANCELLED WELL
   BEFORE THE SCHEDULED EXPIRATION AT 03Z AS ANY RESIDUAL SEVERE THREAT
   THERE SHOULD REMAIN ISOLATED.

   ..COOK.. 06/02/2015


   ATTN...WFO...BYZ...GGW...RIW...TFX...SLC...PIH...BOI...LKN...

   LAT...LON   43601089 43991072 44611031 45321006 46121019 46641050
               46911112 47201162 47571149 47711120 47761020 47660832
               47320801 46710781 45840784 45220798 44580823 44080875
               43690941 43500992 43041044 42501081 42091114 41851165
               41761251 41711333 41711384 41741420 41911432 42181421
               42241407 42391366 42401313 42441236 42801158 43311100
               43601089 

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Page last modified: June 02, 2015
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