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Mesoscale Discussion 1061
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   Mesoscale Discussion 1061
   NWS Storm Prediction Center Norman OK
   0616 PM CDT Fri Jun 16 2017

   Areas affected...Portions of the mid Missouri Valley

   Concerning...Severe Thunderstorm Watch 339...

   Valid 162316Z - 170115Z

   The severe weather threat for Severe Thunderstorm Watch 339

   SUMMARY...A line of significant severe thunderstorms will move
   through the Omaha metro area over the next couple of hours. Damaging
   wind gusts (a few of which could be 75+ mph), large hail, and
   tornadoes will remain possible.

   DISCUSSION...Regional radar data depict a cluster of
   high-precipitation supercells across eastern Nebraska early this
   evening. These storms have already produced an array of severe
   weather, including a gust to 74 mph at Norfolk, NE as a stout
   mesocyclone passed the site. As of 2300Z, KOAX data exhibited at
   least two strong rear-flank downdraft surges within this line of
   embedded supercells. These surges should support a continued upscale
   growth of these cells into a bowing complex that accelerates rapidly
   southeast towards Omaha, likely reaching the metro area around
   00-01Z (7-8pm CDT). 

   A 21Z OAX observed sounding sampled a thermodynamic profile quite
   favorable for damaging wind gusts. Moreover, low-level and
   deep-layer shear suggest very large hail and tornadoes will remain
   possible in any discrete or embedded supercellular elements.
   Therefore, all severe hazards remain possible with these storms, and
   damaging gusts (some of which could be over 75 mph) appear likely
   in/around the Omaha and Lincoln areas within the next 1-2 hours.
   Additionally, downstream watch issuance in Iowa/Missouri will likely
   be needed within the next two hours.

   ..Picca.. 06/16/2017

   ...Please see for graphic product...


   LAT...LON   41389884 42239762 42379620 42269598 42029561 40919430
               39719435 39369525 39409672 40029797 40559851 41049892
               41169886 41389884 

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