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Mesoscale Discussion 1658
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   MESOSCALE DISCUSSION 1658
   NWS STORM PREDICTION CENTER NORMAN OK
   0933 PM CDT SUN AUG 09 2015

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

   CONCERNING...SEVERE THUNDERSTORM WATCH 483...

   VALID 100233Z - 100300Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 483
   CONTINUES.

   SUMMARY...THREAT FOR A FEW INSTANCES OF DAMAGING WIND AND LARGE HAIL
   WILL PERSIST THROUGH ABOUT 04Z FROM NERN NEB...SERN SD INTO NWRN
   IA...BUT OVERALL TREND SHOULD BE FOR ACTIVITY TO BEGIN A WEAKENING
   TREND AFTER 03Z. WW 483 WILL BE LOCALLY EXTENDED FOR AN HOUR OVER
   EXTREME SERN SD...NWRN IA AND NERN NEB...BUT A DOWNSTREAM WW WILL
   NOT LIKELY BE NEEDED.

   DISCUSSION...STORMS CONTINUE DEVELOPING SEWD THROUGH EXTREME SERN
   SD...NWRN IA AND NERN NEB PRIMARILY ALONG A SWD ADVANCING CONVECTIVE
   OUTFLOW BOUNDARY. THE ATMOSPHERE REMAINS MODERATELY UNSTABLE IN THIS
   REGION WITH EFFECTIVE BULK SHEAR SUPPORTIVE OF SUPERCELLS AND BOWING
   SEGMENTS. HOWEVER...A GRADUAL INCREASE IN CONVECTIVE INHIBITION AND
   WEAK BACKGROUND FORCING...INCLUDING ABSENCE OF A LLJ SUGGEST STORMS
   SHOULD BEGIN A GRADUAL WEAKENING TREND BETWEEN 03-04Z. IN THE
   MEANTIME...THE STRONGER STORMS WILL REMAIN CAPABLE OF PRODUCING HAIL
   AND STRONG WIND GUSTS.

   ..DIAL.. 08/10/2015


   ATTN...WFO...DMX...FSD...OAX...GID...LBF...

   LAT...LON   42639757 42679598 43079420 42449382 41859484 41449645
               41369765 41609851 42439852 42639757 

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Page last modified: August 10, 2015
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