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Mesoscale Discussion 1683
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   MESOSCALE DISCUSSION 1683
   NWS STORM PREDICTION CENTER NORMAN OK
   0540 PM CDT FRI AUG 14 2015

   AREAS AFFECTED...WRN MT

   CONCERNING...SEVERE THUNDERSTORM WATCH 488...

   VALID 142240Z - 142315Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 488
   CONTINUES.

   SUMMARY...THUNDERSTORM WIND GUSTS 50-70 MPH WILL BE THE PRIMARY
   SEVERE THREAT THIS EVENING.

   DISCUSSION...RADAR MOSAIC SHOWS SCATTERED THUNDERSTORMS OVER SWRN
   AND WRN MT AHEAD OF A POWERFUL SHORTWAVE TROUGH APPROACHING THE NRN
   ROCKIES FROM THE PACIFIC NW.  KMSO MEASURED A 39-KT GUST AT 2218Z. 
   SURFACE ANALYSIS SHOWS POCKETS OF UNMODIFIED AIR FROM EARLIER
   CONVECTION LOCATED FROM NEAR HLN NWWD IMMEDIATELY AHEAD OF A STORM
   CLUSTER AROUND MSO.  COOL OUTFLOW AIR IS SURGING SEWD E OF THE ROCKY
   MTN FRONT AND CTB HAS DROPPED INTO THE UPPER 60S.  FOR AREAS LOCATED
   S OF THE COOL OUTFLOW TO THE N AND AREAS DOWNSTREAM OF THE EXISTING
   CONVECTION...VERY STEEP LOW- TO MID-LEVEL LAPSE RATES /REFERENCE THE
   20Z TFX RAOB/ AND A VERY DRY SUB-CLOUD LAYER WILL PROMOTE
   EVAPORATIVE COOLING AND THE POSSIBILITY FOR 50-70 MPH WIND GUSTS
   OVER THE NEXT FEW HOURS AS STORMS MOVE INTO POWELL...LEWIS AND
   CLARK...MEAGHER...AND CASCADE COUNTIES.

   ..SMITH.. 08/14/2015


   ATTN...WFO...TFX...MSO...

   LAT...LON   45811241 46601358 47271372 47641145 47311085 46651059
               46201116 45811241 

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Page last modified: August 14, 2015
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