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Mesoscale Discussion 1693
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   Mesoscale Discussion 1693
   NWS Storm Prediction Center Norman OK
   0745 PM CDT Tue Sep 15 2020

   Areas affected...The Florida Panhandle

   Concerning...Tornado Watch 490...

   Valid 160045Z - 160245Z

   The severe weather threat for Tornado Watch 490 continues.

   SUMMARY...The tornado threat continues for WW 490, and may gradually
   increase in the next 1-2 hours for portions of the Emerald Coast in
   the Florida Panhandle.

   DISCUSSION...Due to the slow northward motion of Hurricane Sally, a
   strongly sheared environment remains in place over the FL Panhandle
   and portions of coastal AL. Recent surface observations from near
   Port St. Joe, FL and Apalachicola, FL have shown a slight increase
   in onshore flow with southeasterly winds and dewpoints increasing
   slightly into the upper 70s. Coincidentally, convection supportive
   of numerous lightning strikes has been recently noted in satellite
   imagery just south of Port St. Joe, FL. This suggests that some
   degree of destabilization may be underway across this region.
   Velocity data from KEVX have also shown weak and transient signs of
   low-level rotation associated with weak offshore convection.
   Although weak instability will continue to limit the overall tornado
   threat in the near term for most of the FL Panhandle, the tornado
   threat may increase in the next 1-2 hours for the Fort Walton Beach
   to Port St. Joe, FL region as convection moves onshore.

   ..Moore.. 09/16/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...TAE...MOB...

   LAT...LON   29428516 29538543 29878562 30108592 30268647 30278686
               30198761 30558762 30658672 30548579 30348540 29978490
               29658471 29438488 29428516 

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Page last modified: September 16, 2020
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