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Mesoscale Discussion 1373
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MD 1373 graphic

   Mesoscale Discussion 1373
   NWS Storm Prediction Center Norman OK
   0731 PM CDT Thu Jul 20 2017

   Areas affected...Northwest SD...Southwest ND

   Concerning...Severe Thunderstorm Watch 425...

   Valid 210031Z - 210200Z

   The severe weather threat for Severe Thunderstorm Watch 425

   SUMMARY...Strong thunderstorms will spread across southwest ND and
   northwest SD this evening. Large hail and damaging winds are
   possible with this activity. New WW (40% probability) may be
   warranted for portions of SD that are not currently included in

   DISCUSSION...Strong boundary-layer heating along a corridor from
   southeast MT into southwest ND has aided thunderstorm
   intensification and a maturing squall line that is now surging
   southeast toward the southeastern-most portion of WW425. Downstream
   air mass is considerably more moist and a not as hot as the
   generation zone of this activity. There is some concern isolated
   severe may linger with the squall line as it propagates into the
   northwestern portion of ABR CWA. Currently monitoring this region
   for possible WW.

   ..Darrow/Guyer.. 07/21/2017

   ...Please see for graphic product...


   LAT...LON   45100375 46860136 46639987 45609993 44270212 45100375 

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