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Mesoscale Discussion 21
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   Mesoscale Discussion 0021
   NWS Storm Prediction Center Norman OK
   0338 AM CST Fri Jan 12 2018

   Areas affected...Parts of southern AR...northern LA and west-central

   Concerning...Winter mixed precipitation 

   Valid 120938Z - 121545Z

   SUMMARY...A mixture of freezing rain and sleet will continue to
   spread eastward during the late overnight into the morning across
   south-central and southeast Arkansas, north-central and northeast
   Louisiana, and into west-central Mississippi.  Freezing rain rates
   should generally be up to 0.05-0.10 inches per 3 hours, though
   higher rates (0.10+ inch/hour) associated with a north-south band of
   moderate precipitation will remain possible, as this band advances
   east.  Locations in south-central Arkansas and north-central
   Louisiana should have a decrease in wintry precipitation by 12-13Z.

   DISCUSSION...GOES-16 IR imagery indicated a north-south band of
   cooling cloud tops moving eastward through south-central AR and
   north-central LA early this morning, with surface observations from
   KCDH and KELD to KRSN indicating moderate to heavy precipitation
   rates since 08-09Z in this band.  These higher rates and cooling
   cloud tops are co-located with a compact area of forcing for ascent
   attendant to the progressive shortwave trough.  Forecast soundings
   suggest cooling of the surface to near-surface air (generally below
   900 mb) will occur faster than the lower troposphere from 750-900
   mb, such that freezing rain and eventually a mixture of sleet and
   freezing rain will occur from west to east across the discussion

   ..Peters.. 01/12/2018

   ...Please see for graphic product...


   LAT...LON   32699273 33059299 33619297 33809264 33829190 33739149
               33539090 33279064 33119066 32789074 32529110 32499197
               32529260 32699273 

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