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Mesoscale Discussion 220
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   Mesoscale Discussion 0220
   NWS Storm Prediction Center Norman OK
   0857 PM CDT Thu Mar 14 2019

   Areas affected...Parts of central and northeastern Alabama into
   northwest Georgia

   Concerning...Tornado Watch 29...

   Valid 150157Z - 150400Z

   The severe weather threat for Tornado Watch 29 continues.

   SUMMARY...A couple of severe storms linger across parts of central
   through east central Alabama, but severe weather potential, in
   general, is in the process of diminishing.  If trends continue as
   currently anticipated through the next hour or two, it is possible
   that the remaining valid portions of the watch could be cancelled
   prior to the scheduled Midnight CDT (1 AM EDT) expiration.

   DISCUSSION...Considerable general weakening of discrete pre-frontal
   thunderstorm activity has been evident for the past hour or so in
   radar and lightning data.  A south-southwesterly 850 mb jet axis
   lingers as far south as northwestern Georgia into central Alabama,
   but wind speeds are gradually weakening, and a relatively moist
   unstable boundary layer along it is gradually becoming less unstable
   with the loss of daytime heating.

   There has been some increase in convection to the northwest and west
   of the region, across the Cumberland Plateau into the lower
   Mississippi Valley, just ahead of where a corridor of weak to
   moderate boundary layer instability appears to linger near a remnant
   dry line.  However, potential for substantive further
   intensification of this activity seems limited, in the presence of
   neutral to rising mid-level heights in the wake of the cyclone over
   the Great Lakes region, before the trailing cold front overtakes the
   dry line/instability axis later this evening.

   ..Kerr.. 03/15/2019

   ...Please see for graphic product...


   LAT...LON   33568675 33888594 34498500 34448408 33598446 32448639
               32388712 32248812 33568675 

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