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Mesoscale Discussion 28
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   MESOSCALE DISCUSSION 0028
   NWS STORM PREDICTION CENTER NORMAN OK
   0629 PM CST MON JAN 05 2015

   AREAS AFFECTED...EASTERN IA/NORTH-CENTRAL IL TO CENTRAL
   INDIANA/SOUTHWEST OH

   CONCERNING...HEAVY SNOW 

   VALID 060029Z - 060530Z

   SUMMARY...MODERATE TO HEAVY SNOW WILL CONTINUE TO DEVELOP
   EAST-SOUTHEASTWARD TONIGHT FROM EASTERN IA /INCLUDING I-80 CORRIDOR/
   AND NORTHWEST IL INTO CENTRAL PORTIONS OF IL AND INDIANA /ESPECIALLY
   ALONG AND NORTH OF THE I-74 CORRIDOR/ INTO SOUTHWEST OH BY LATE
   EVENING/OVERNIGHT. SNOWFALL RATES WILL LOCALLY EXCEED 1 IN/HR.

   DISCUSSION...A CLIPPER-TYPE AMPLIFYING SHORTWAVE TROUGH CURRENTLY
   OVER THE MIDDLE MO VALLEY WILL CONTINUE TO RACE SOUTHEASTWARD AND
   REACH THE MIDDLE OH RIVER VALLEY LATE TONIGHT/EARLY TUESDAY. WITHIN
   A COLD AIR MASS...RELATED DPVA AND PRECEDING STRONG WARM
   ADVECTION/FRONTOGENETICAL FORCING WILL CONTRIBUTE TO AMPLE FORCING
   FOR ASCENT SUPPORTIVE OF MODERATE/LOCALLY HEAVY SNOWFALL
   PARTICULARLY TO THE NORTH/NORTHEAST OF A WEAK SURFACE
   LOW/EASTWARD-EXTENDING WARM FRONT. THIS WILL RESULT IN A WNW-ESE
   ORIENTED CORRIDOR OF MODERATE TO HEAVY SNOWFALL...ESPECIALLY FOR A
   3-6 HOUR DURATION...FROM EASTERN IA/NORTHWEST IL INTO
   CENTRAL/EAST-CENTRAL IL...AND PORTIONS OF CENTRAL INDIANA/SOUTHWEST
   OH BY LATE EVENING/OVERNIGHT. WITH SINGLE DIGIT TEMPERATURES /F/
   PREVALENT...RELATIVELY HIGH SNOW-TO-LIQUID RATIOS /AS HIGH AS 25:1/
   WILL FURTHER ENHANCE SNOWFALL TOTALS.

   ..GUYER.. 01/06/2015


   ATTN...WFO...ILN...IWX...IND...LOT...ILX...DVN...ARX...DMX...

   LAT...LON   42159301 42719226 42249011 41338743 40958517 40198401
               39418397 39338447 39278509 39648757 40359011 41349276
               42159301 

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Page last modified: January 06, 2015
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