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Mesoscale Discussion 96
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   Mesoscale Discussion 0096
   NWS Storm Prediction Center Norman OK
   0721 PM CST Mon Feb 11 2019

   Areas affected...Portions of northeastern Illinois and Chicagoland

   Concerning...Winter mixed precipitation 

   Valid 120121Z - 120715Z

   SUMMARY...A mix of freezing rain and sleet will be possible through
   the evening and into the early morning hours (4-5 AM CST). Highest
   freezing rain rates are expected during the 12-2 AM time frame.

   DISCUSSION...As a broad area of precipitation continues to spread
   over the Upper-Midwest, a few surface observation stations across
   the Chicagoland and vicinity are reporting freezing rain and
   sleet/ice pellets. Dual-polarization KLOT radar imagery shows a warm
   layer aloft as far north as a line from Rochelle to Evanston. As a
   mid-level shortwave trough continues to approach from the west, the
   850 mb low should deepen as it moves across northern Illinois. A
   fairly long duration freezing rain/sleet event is expected through
   about 4-5 AM CST. While freezing rain rates are not anticipated to
   be overly high given the near freezing surface temperatures in the
   surface to 850 mb layer, the duration of the event may lead to
   modest ice accretion in some locations. The highest freezing rain
   rates are anticipated to occur during the 12-2 AM CST period when
   850 mb warm advection is maximized across the region.

   ..Wendt.. 02/12/2019

   ...Please see for graphic product...


   LAT...LON   41958938 42208850 42118780 41748762 41548770 41348812
               41128899 41178950 41488978 41818960 41958938 

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