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Mesoscale Discussion 685
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   MESOSCALE DISCUSSION 0685
   NWS STORM PREDICTION CENTER NORMAN OK
   0625 AM CDT SUN MAY 17 2015

   AREAS AFFECTED...NRN AR

   CONCERNING...SEVERE THUNDERSTORM WATCH 187...

   VALID 171125Z - 171230Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 187
   CONTINUES.

   SUMMARY...STRONG GUSTY WINDS WILL BE POSSIBLE ACROSS WW 187 BUT ANY
   SEVERE THREAT APPEARS TO BE DIMINISHING.  WW 187 WILL BE ALLOWED TO
   EXPIRE AT 12Z.

   DISCUSSION...A CONVECTIVE LINE EXTENDING FROM NRN AR SWWD TO NEAR
   THE OK-TX-AR STATELINE INTERSECTION WILL CONTINUE TO MOVE EWD ACROSS
   NRN AND CNTRL AR OVER THE NEXT FEW HOURS. ALTHOUGH SOME INSTABILITY
   EXISTS AHEAD OF THE LINE OF STORMS...MLCAPE IS ESTIMATED BETWEEN 250
   AND 500 J/KG BY MESOANALYSIS DATA. ALTHOUGH THE LINE MAY LINGER THIS
   MORNING...THE VERY WEAK INSTABILITY SHOULD CONTINUE TO DIMINISH THE
   SEVERE THREAT ACROSS THE REGION.

   ..BROYLES/WEISS.. 05/17/2015


   ATTN...WFO...MEG...LZK...TSA...

   LAT...LON   35089245 35039278 35069302 35289321 35219336 35149366
               34999370 35019406 35059414 35129414 35119402 35379378
               35349370 35769369 35759354 36089344 36109345 36129330
               36479325 36479137 36279126 36189135 35909139 35899118
               35729136 35529137 35539174 35369182 35359244 35089245 

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Page last modified: May 17, 2015
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