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Mesoscale Discussion 1289
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   Mesoscale Discussion 1289
   NWS Storm Prediction Center Norman OK
   0709 PM CDT Tue Jul 11 2017

   Areas affected...eastern North Dakota through northwest Minnesota

   Concerning...Tornado Watch 408...

   Valid 120009Z - 120215Z

   The severe weather threat for Tornado Watch 408 continues.

   SUMMARY...Storms including supercells are expected to continue from
   eastern North Dakota through northwest Minnesota next couple hours,
   posing a threat for a few tornadoes, large hail and damaging wind.

   DISCUSSION...Cluster of supercells that initiated along what appears
   to be a cold front/dryline merger just south of surface low
   continues from northeast ND into extreme northwest MN. Surface
   analysis indicates a warm front extending from northeast ND
   southeastward through western MN. Greater tornado threat next couple
   hours is expected with storms that interact with this boundary where
   low-level shear is maximized. More isolated development remains
   possible farther south over southeast ND. Overall tornado threat
   should begin to decrease by 03Z as the boundary layer stabilizes.

   ..Dial.. 07/12/2017

   ...Please see for graphic product...


   LAT...LON   48339746 48049668 47359589 46789644 47459708 48199775

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