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Mesoscale Discussion 18
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   Mesoscale Discussion 0018
   NWS Storm Prediction Center Norman OK
   0843 PM CST Thu Jan 11 2018

   Areas affected...Northeast Arkansas...Southeast Missouri...Illinois
   and Western Indiana

   Concerning...Freezing rain 

   Valid 120243Z - 120845Z

   SUMMARY...A mix of freezing rain and sleet will continue to develop
   along a corridor from northeast Arkansas into western Indiana.
   Freezing-rain rates will be around 0.10 inches per hour within the
   heavier showers.

   DISCUSSION...Latest surface analysis shows a distinct cold front
   located from far northeast Arkansas north northeastward into
   southeast Illinois and western Indiana. A large-scale upper-level
   trough over the central U.S. is evident on water-vapor imagery. A
   band of enhanced large-scale ascent is located ahead of the
   upper-level trough from the mid Mississippi Valley northeastward
   into the Ohio Valley according to water-vapor imagery. This is
   aiding the development of several large patches of rain with
   embedded showers. As the cold front moves southeastward into the mid
   Mississippi and lower Ohio Valley, temperatures will rapidly drop
   below freezing from northwest to southeast across the region. As
   freezing air undercuts the precipitation, freezing rain and sleet
   will increase in coverage across the MCD area. Freezing-rain rates
   are expected to reach 0.10 inches per hour in some of the heavier

   ..Broyles/Edwards/Gleason.. 01/12/2018

   ...Please see for graphic product...


   LAT...LON   39108705 37358867 35469019 35279100 35369145 35679202
               36149215 38109080 40128869 40638758 40008656 39108705 

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