ZCZC SPCSWOMCD ALL
ACUS11 KWNS 060029 
SPC MCD 060029 
OHZ000-INZ000-ILZ000-IAZ000-060530-

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

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

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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