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Mesoscale Discussion 1968
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   MESOSCALE DISCUSSION 1968
   NWS STORM PREDICTION CENTER NORMAN OK
   0415 AM CST MON DEC 08 2014

   AREAS AFFECTED...SERN WI...FAR NRN IL

   CONCERNING...FREEZING RAIN 

   VALID 081015Z - 081345Z

   SUMMARY...SPATIAL EXTENT OF LIGHT FREEZING RAIN SHOULD DECREASE
   DURING THE MORNING COMMUTE HOURS...BUT RATES OF .02-.08 IN/HR SHOULD
   PERSIST THROUGH AT LEAST 13Z FROM JUST S OF GREEN BAY TO BETWEEN
   ROCKFORD AND WESTERN CHICAGOLAND.

   DISCUSSION...LOW-LEVEL WAA-DRIVEN MIXED PRECIPITATION EXISTS WITHIN
   A BAND FROM NEAR KGRB TO NWRN IL. AMDAR DATA INVOF KMDW AT 0730Z
   STILL SAMPLED  A RATHER DRY SUB-CLOUD LAYER...ALSO EVIDENT IN 00Z
   GRB RAOB...WHICH WILL CONTINUE TO SLOW THE EWD PROGRESSION OF THIS
   PRECIPITATION BAND THROUGH THE MORNING. HOWEVER...SURFACE
   TEMPERATURES OF 29-32 DEG F WERE EVIDENT IMMEDIATELY AHEAD OF THE
   BAND...WHICH SHOULD SUPPORT PERSISTENCE OF FREEZING RAIN EVEN AS
   LOW-LEVEL TEMPERATURES COOL THROUGH WET-BULB EFFECTS. THE GREATEST
   ICE ACCRETION SHOULD LARGELY REMAIN IN WI /AS CONFIRMED BY ASOS
   ICING ESTIMATES REF 10Z KOSH/KMSN OBS/...BUT LIGHT ICING MAY OCCUR
   AS FAR SE AS THE WRN CHICAGOLAND SUBURBS DURING THE MORNING COMMUTE.

   ..GRAMS.. 12/08/2014


   ATTN...WFO...GRB...LOT...MKX...

   LAT...LON   43998858 44288832 44248810 44058803 42998812 42228812
               41868821 41598897 41658929 41968943 43218923 43278922
               43948874 43998858 

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Page last modified: December 08, 2014
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