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Mesoscale Discussion 640
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   MESOSCALE DISCUSSION 0640
   NWS STORM PREDICTION CENTER NORMAN OK
   0258 PM CDT WED MAY 21 2014

   AREAS AFFECTED...DENVER METRO VICINITY

   CONCERNING...TORNADO WATCH 165...

   VALID 211958Z - 212100Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 165 CONTINUES.

   SUMMARY...SUPERCELLS OVER THE DENVER METRO AREA WILL LIKELY CONTINUE
   TO INTENSIFY OVER THE NEXT HOUR OR SO AND POSE A LARGE TO VERY LARGE
   HAIL THREAT.  THE POTENTIAL FOR A MESOCYCLONIC TORNADO APPEARS TO BE
   INCREASING TOO.

   DISCUSSION...SURFACE MESOANALYSIS SHOWS STRONG ELY FLOW FOCUSED IN
   THE DCVZ IN THE IMMEDIATE VICINITY OF THE DENVER METRO AREA.  KFTG
   RADAR IMAGERY OVER THE PAST HOUR SHOWS A FEW STORMS EXHIBITING
   SUPERCELL STRUCTURE WITH THE MOST INTENSE STORM OVER THE DENVER CITY
   LIMITS AS OF 1955Z.  THE BACKED LOW-LEVEL FLOW ATTRIBUTED TO THE
   DCVZ AND THE PROXIMITY OF THE OUTFLOW BOUNDARY WOULD SUGGEST
   LOW-LEVEL STORM ROTATION WILL PROBABLY INCREASE.  ADDITIONAL THREATS
   WITH THE DENVER AREA ACTIVITY INCLUDE LARGE TO VERY LARGE HAIL.  THE
   NSSL-SHAVE EXPERIMENT DOCUMENTED GOLFBALL HAIL OVER SWRN DENVER
   WITHIN THE PAST 30-45 MINUTES AND THE LARGE HAIL THREAT WILL
   PROBABLY INCREASE FURTHER AS THE STORMS CONTINUE TO MATURE/ORGANIZE.

   ..SMITH.. 05/21/2014


   ATTN...WFO...BOU...

   LAT...LON   39400485 39630538 40000504 39930447 39660440 39400485 

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