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Mesoscale Discussion 1050
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   MESOSCALE DISCUSSION 1050
   NWS STORM PREDICTION CENTER NORMAN OK
   1018 PM CDT TUE JUN 17 2014

   AREAS AFFECTED...NERN NEB...SERN SD AND SWRN MN AND NWRN IA

   CONCERNING...TORNADO WATCH 315...

   VALID 180318Z - 180415Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 315 CONTINUES.

   SUMMARY...THREAT FOR TORNADOES...VERY LARGE HAIL AND DAMAGING WIND
   GUSTS WILL PERSIST NEXT COUPLE HOURS FROM NERN NEB...NWRN IA...SERN
   SD AND SWRN MN.

   DISCUSSION...ROTATIONAL VELOCITIES INDICATE THE CYCLIC TORNADIC
   SUPERCELL OVER EXTREME NERN NEB IS LIKELY STILL PRODUCING A STRONG
   TORNADO AS OF 0315Z. ADDITIONAL STORMS ARE DEVELOPING OVER SERN SD
   INTO NWRN IA JUST NORTH OF AN E-W ORIENTED QUASI-STATIONARY FRONT.
   DESPITE THE ONSET OF NOCTURNAL COOLING...THE ATMOSPHERE REMAINS VERY
   UNSTABLE IN THIS REGION. A VERY MOIST WARM SECTOR WITH LOW 70S
   DEWPOINTS IS DELAYING THE TENDENCY FOR THE BOUNDARY LAYER TO
   DECOUPLE...AND NEW STORMS DEVELOPING ARE LIKELY STILL SURFACE BASED.
   THE VWP FROM SIOUX FALLS SHOWS VEERING LOW-LEVEL WINDS WITH 0-2 KM
   STORM RELATIVE HELICITY AROUND 200 M2/S2...SUGGESTING THE THREAT FOR
   LOW-LEVEL MESOCYCLONES AND TORNADOES STILL EXISTS IN ADDITION TO
   VERY LARGE HAIL.

   ..DIAL.. 06/18/2014


   ATTN...WFO...MPX...DMX...FSD...OAX...

   LAT...LON   43309495 42119537 42119808 44099792 44309561 43309495 

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Page last modified: June 18, 2014
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