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Mesoscale Discussion 1188
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MD 1188 graphic

   Mesoscale Discussion 1188
   NWS Storm Prediction Center Norman OK
   0608 PM CDT Thu Jun 29 2017

   Areas affected...Southeast SD...eastern NE...Western IA

   Concerning...Severe Thunderstorm Watch 381...

   Valid 292308Z - 300015Z

   The severe weather threat for Severe Thunderstorm Watch 381
   continues.

   SUMMARY...Severe threat will increase across the eastern parts of
   WW381 over the next few hours.

   DISCUSSION...Well-defined short-wave trough is ejecting across SD/NE
   this evening and large-scale forcing for ascent appears to be aiding
   convection centered near the SD/NE/IA region. Over the last hour or
   so numerous individual thunderstorm elements have begun to cluster
   and a weak MCS may be evolving. While a surface boundary draped
   across northern IA may help focus this activity, low-level
   convergence is not strong along the wind shift. Even so, convective
   cold pool should aid eastward propagation of this activity toward
   the eastern edge of WW381 within the next 1-2 hours. Large
   hail/damaging winds are the primary threats with this convection.

   ..Darrow.. 06/29/2017

   ...Please see www.spc.noaa.gov for graphic product...

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

   LAT...LON   42999954 43409475 40939475 40549954 42999954 

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