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Mesoscale Discussion 672
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   MESOSCALE DISCUSSION 0672
   NWS STORM PREDICTION CENTER NORMAN OK
   0711 PM CDT SAT MAY 16 2015

   AREAS AFFECTED...PORTIONS OF NORTHEAST SOUTH DAKOTA AND WEST CENTRAL
   MINNESOTA

   CONCERNING...TORNADO WATCH 175...

   VALID 170011Z - 170145Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 175 CONTINUES.

   SUMMARY...THE RISK FOR A TORNADO OR TWO WILL CONTINUE FOR THE NEXT
   1-2 HOURS BEFORE DECREASING AS THE EVENING PROGRESSES.

   DISCUSSION...THUNDERSTORMS CONTINUE TO DEVELOP ACROSS PORTIONS OF
   THE DAKOTAS AND MINNESOTA...ALONG AND NORTH OF A SYNOPTIC WARM FRONT
   EXTENDING EASTWARD FROM A SURFACE LOW LOCATED IN CENTRAL SOUTH
   DAKOTA. THE STRONGEST THUNDERSTORMS...AND GREATEST THREAT FOR A
   TORNADO...ARE LOCATED ACROSS PORTIONS OF WEST-CENTRAL MINNESOTA.
   THIS REGION IS LOCATED ALONG AND NORTH OF THE SYNOPTIC WARM FRONT
   AND WHERE THE JUXTAPOSITION OF STORM-RELATIVE HELICITY AND
   SURFACE-BASED INSTABILITY IS MAXIMIZED. AS THE EVENING
   PROGRESSES...THE LOSS OF DAYTIME HEATING AND STRENGTHENING COLD POOL
   /DUE TO THE INCREASING NUMBER OF STORMS/ SHOULD RESULT IN A DECREASE
   IN SURFACE-BASED INSTABILITY AND A CORRESPONDING DECREASE IN TORNADO
   THREAT. HOWEVER...IN THE SHORT-TERM...THE TORNADO THREAT WILL
   CONTINUE.

   ..MARSH.. 05/17/2015


   ATTN...WFO...DLH...MPX...FGF...FSD...ABR...

   LAT...LON   44209511 44209522 44209551 44209558 44549748 44939748
               45159748 46119626 46369516 46369494 46369473 46369466
               46369466 46349465 45729422 45689418 45439405 45439405
               45419405 44979426 44459462 44279487 44209511 44209511 

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Page last modified: May 17, 2015
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