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Mesoscale Discussion 78
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   Mesoscale Discussion 0078
   NWS Storm Prediction Center Norman OK
   0918 PM CST Tue Feb 20 2018

   Areas affected...portions of northern and central IL into central MO

   Concerning...Winter mixed precipitation 

   Valid 210318Z - 210915Z

   SUMMARY...Rain will transition to a wintry mix of freezing rain,
   sleet and snow across parts of northern and central IL into central
   MO over the next several hours. This wintry mix is expected to
   continue through the overnight hours, though precipitation rate
   should remain light.

   DISCUSSION...A slow, eastward-advancing cold front was draped from
   roughly northwestern IN into northwest AR this evening. Cooler
   temperatures are filtering southward across the mid-MS Valley, with
   readings generally in the 32-37 degree F range from near Chicago
   toward St. Louis and Springfield MO. Light to moderate precipitation
   was occurring over this area with mainly rain noted on the eastern
   edge of the MCD area with a mix of precip types further west. This
   transition from rain to a wintry mix will slowly progress eastward
   through 09z. Precipitation should generally remain light as heavier
   precipitation translates eastward with the front. Freezing rain
   rates up to 0.05 inches per 3 hours are expected through the night.
   Sleet and occasionally light snow may mix with freezing rain.

   ..Leitman.. 02/21/2018

   ...Please see for graphic product...


   LAT...LON   41808743 40958789 40198839 39228910 38389018 37909104
               37389207 37279259 37309306 37609318 37959312 38549267
               39049218 40099101 40859017 41418940 41998851 42128797
               42038771 41808743 

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