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Mesoscale Discussion 21
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   Mesoscale Discussion 0021
   NWS Storm Prediction Center Norman OK
   0415 PM CST Fri Jan 06 2017

   Areas affected...central LA...southern and central MS and central AL

   Concerning...Winter mixed precipitation 

   Valid 062215Z - 070215Z


   SUMMARY...Freezing rain and sleet will increase along a corridor
   from central LA, across central MS, into central AL this
   afternoon/evening.  Significant icing, with rates approaching .10
   inch/hr in heavier convection, is expected.

   DISCUSSION...Latest vis satellite imagery exhibits deepening
   convection across the lower Sabine river valley extending into
   southern portions of MS.  Lightning is increasing within the taller
   updrafts, partly in response to increasing ascent ahead of
   approaching short-wave trough.  An elongated corridor of
   precipitation, with embedded thunderstorms, is expected to expand in
   areal coverage/intensity over the next several hours from the lower
   Mississippi Valley to the central Gulf states.

   With boundary-layer temperatures expected to cool a few degrees
   along this corridor it appears the risk for significant icing will
   increase as the afternoon progresses into the evening hours.  As the
   cold air deepens, sleet will become common along the nrn edge of
   this expanding precip shield.  With time, mixed precipitation will
   spread into northern GA later this evening.

   ..Darrow.. 01/06/2017


   LAT...LON   31239343 32499079 34008642 33738539 32538652 31448923
               30599225 31239343 

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