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Mesoscale Discussion 1758
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MD 1758 graphic

   Mesoscale Discussion 1758
   NWS Storm Prediction Center Norman OK
   0251 PM CST Sun Nov 05 2017

   Areas affected...Southeastern Missouri...southern and central
   Illinois...and a small part of western Kentucky

   Concerning...Tornado Watch 512...

   Valid 052051Z - 052245Z

   The severe weather threat for Tornado Watch 512 continues.

   SUMMARY...The severe threat continues across much of WW 512.  A new
   tornado watch is being considered south and east of WW 512.

   DISCUSSION...Scattered storms continue to develop primarily along a
   southeastward-moving cold front along northern portions of the
   discussion area.  A few of these storms have produced severe wind
   gusts and large hail - particularly near the Saint Louis
   Metropolitan Area.  Northeast of STL, storms have been mostly
   elevated along and just behind the cold front, although they may
   become surface based as they forward-propagate eastward toward
   greater surface-based instability over the next couple of hours.

   Farther southwest, additional convection has continued to increase
   along and ahead of the cold front.  A greater supercell threat may
   emerge with this activity given its more cellular mode, moderate
   surface-based instability, and veering wind fields.  These cells
   will likely pose a threat for all modes of severe over the next few
   hours and eventually extend east/south of WW 512.  A new tornado
   watch will be needed in these areas relatively soon.

   ..Cook/Hart.. 11/05/2017

   ...Please see for graphic product...


   LAT...LON   38189140 38869073 39568943 40048822 40088760 39368728
               38338723 37878727 37258783 36878908 36879037 36899103
               37109159 37699172 38189140 

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