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Mesoscale Discussion 1639
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   Mesoscale Discussion 1639
   NWS Storm Prediction Center Norman OK
   0933 PM CDT Sun Sep 10 2017

   Areas affected...Central Florida northward into far southeastern

   Concerning...Tornado Watch 483...

   Valid 110233Z - 110400Z

   The severe weather threat for Tornado Watch 483 continues.

   SUMMARY...The tornado threat associated with Hurricane Irma should
   gradually shift northward in tandem with northward progress of the
   center of circulation.  A new Tornado Watch will likely be
   coordinated around 0330Z.

   DISCUSSION...Irma continues northward progress across southwestern
   Florida.  The tornado threat over the past several hours has
   continued within the northeastern quadrant of the circulation, with
   a few brief tornadoes reported especially along eastern portions of
   the Peninsula where buoyancy remains the strongest.  Scattered
   bands/cells (exhibiting occasional strong rotation) continue to
   rapidly migrate northwestward into the discussion area from open
   Atlantic waters at this time, and observations/models suggest that
   this regime should persist well into the mid-morning Monday -
   especially near coastal areas along and east/northeast of Irma's

   Given the continued tornado threat, a new Tornado Watch will be
   coordinated at around 0330Z.

   ..Cook/Grams.. 09/11/2017

   ...Please see for graphic product...


   LAT...LON   27087925 26928039 26958122 26568181 26398274 27088354
               27338363 27618372 28858405 30638330 31458162 31458162
               31118027 27297912 27087925 

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