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1/5-1/6 clipper system


Thundersnow12

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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.

 

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Hot off the press from the SREF prediction center 

 

 

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.

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