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Mesoscale Discussion 879
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   Mesoscale Discussion 0879
   NWS Storm Prediction Center Norman OK
   0702 PM CDT Sat May 27 2017

   Areas affected...middle TN

   Concerning...Severe Thunderstorm Watch 280...

   Valid 280002Z - 280100Z

   The severe weather threat for Severe Thunderstorm Watch 280
   continues.

   SUMMARY...Scattered severe gusts (60-70 mph) will probably result in
   fairly extensive tree damage in swaths across middle Tennessee this
   evening.  A new severe thunderstorm watch may be considered during
   the next hour or so for portions of northeast Alabama and northern
   Georgia if it appears the risk for severe gusts will persist into
   the mid-late evening.

   DISCUSSION...Radar mosaic shows a severe line segment across
   northwestern portions of middle TN moving southeast at 40-kt.  The
   KHPX VAD showed a 50-kt rear inflow jet with the squall line.  The
   airmass over middle TN is considered moderately unstable with a 15.3
   lowest 100-mb mean mixing ratio with westerly flow increasing with
   height to 50-kt through 400-mb.  Forecasting scattered 60-70 mph
   gusts as this line segment travels southeast to the west of a warm
   advection wing of thunderstorms over east-central TN.  Extensive
   tree damage is probable with the higher gusts.

   ..Smith.. 05/28/2017

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

   ATTN...WFO...MRX...FFC...OHX...HUN...MEG...

   LAT...LON   34928691 36298804 36648667 35858548 34938548 34928691 

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