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Mesoscale Discussion 122
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MD 122 graphic

   Mesoscale Discussion 0122
   NWS Storm Prediction Center Norman OK
   0737 PM CST Wed Feb 12 2020

   Areas affected...Portions of central/northern AL into middle/eastern
   TN and far northwestern GA

   Concerning...Severe Thunderstorm Watch 34...

   Valid 130137Z - 130300Z

   The severe weather threat for Severe Thunderstorm Watch 34

   SUMMARY...Isolated damaging winds will remain possible for the next
   hour or two, with the overall threat expected to gradually diminish
   into eastern TN. Additional watch issuance is not expected at this

   DISCUSSION...A low-topped squall line will continue its fast
   east-northeastward motion across middle/eastern TN this evening.
   Isolated instances of strong to damaging winds will be the main
   threat with this convection for the next 1-2 hours. Winds in the
   boundary layer remain quite strong in association with a 60-70+ kt
   low-level jet. However, already meager instability quickly becomes
   negligible with eastward extent into eastern TN, where surface
   temperatures are in the 40s and 50s F, with dewpoints in the mid 40s
   to low 50s. This will likely result in a gradual lessening of the
   damaging wind risk into more of eastern TN beyond 03Z. Additional
   Severe Thunderstorm Watch issuance into eastern TN/far northwestern
   GA is not expected at this time.

   Farther south across parts of northern/central AL, the convective
   line has become oriented largely parallel to strong mid-level
   southwesterly flow. Overall eastward movement of the line has slowed
   accordingly. Although strong/gusty winds may still occur in the
   short term, the severe risk should continue to diminish this evening
   as the strong forcing associated with the low-level jet shifts
   northward and away from this region.

   ..Gleason.. 02/13/2020

   ...Please see for graphic product...


   LAT...LON   33658758 34998587 36598478 36538386 35848394 33998546
               33278709 33658758 

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