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Mesoscale Discussion 723
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   Mesoscale Discussion 0723
   NWS Storm Prediction Center Norman OK
   0734 PM CDT Mon May 15 2017

   Areas affected...Southeastern Montana...southwestern North
   Dakota...western South Dakota...eastern Wyoming...and northwestern

   Concerning...Severe Thunderstorm Watch 215...

   Valid 160034Z - 160130Z

   The severe weather threat for Severe Thunderstorm Watch 215

   SUMMARY...The severe threat continues across the entire watch area.

   DISCUSSION...Scattered thunderstorms have developed within an
   upslope flow regime over WW 215.  These storms have occasionally
   exhibited supercellular characteristics, with several instances of
   1-2" hail being reported in the strongest and most persistent
   activity.  Low-level shear is relatively weak, which should keep the
   overall tornado threat at a minimum.  But sufficient deep shear,
   along with steep mid-level lapse rates and moderate instability,
   should result in a continued threat for scattered severe hail and
   isolated instances of damaging wind gusts in and near the WW area
   through the scheduled 0600 UTC expiration time.

   ..Cook/Guyer.. 05/16/2017

   ...Please see for graphic product...


   LAT...LON   46850607 47160554 47310456 46860292 46240210 44700188
               43330183 42250198 41800260 41390422 41310476 42170541
               43430607 45170641 46440642 46850607 

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