716  
ACUS11 KWNS 090308  
SWOMCD  
SPC MCD 090307  
ILZ000-WIZ000-IAZ000-090900-  
 
MESOSCALE DISCUSSION 0061  
NWS STORM PREDICTION CENTER NORMAN OK  
0907 PM CST THU FEB 08 2018  
 
AREAS AFFECTED...PORTIONS OF IA...SOUTHERN WI...AND NORTHERN IL  
 
CONCERNING...HEAVY SNOW  
 
VALID 090307Z - 090900Z  
 
SUMMARY...A NARROW BAND OF MODERATE TO HEAVY SNOW WILL LIKELY  
PRODUCE SNOWFALL RATES AROUND 1 INCH PER HOUR THROUGH THE EARLY  
MORNING.  
 
DISCUSSION...A LOW-AMPLITUDE SHORTWAVE TROUGH PRESENT OVER NE/KS  
WILL MOVE EASTWARD ACROSS THE UPPER MIDWEST OVERNIGHT. LARGE-SCALE  
LIFT AHEAD OF THIS TROUGH HAS PROMOTED A BROAD AREA OF LIGHT TO  
MODERATE SNOW EXTENDING FROM EASTERN SD TO SOUTHERN WI/NORTHERN IL.  
A STRENGTHENING SOUTHWESTERLY LOW-LEVEL JET ACROSS SOUTHERN IA IS  
FOCUSING A LOW-LEVEL BAROCLINIC ZONE ACROSS CENTRAL IA AS OF 03Z.  
RELATED FRONTOGENETIC FORCING SHOULD REMAIN CENTERED AROUND 850 MB,  
AND A NARROW WEST-TO-EAST ORIENTED BAND OF MODERATE TO HEAVY SNOW  
HAS RECENTLY DEVELOPED ACROSS CENTRAL IA ON THE NOSE OF THE  
LOW-LEVEL JET. SNOWFALL RATES AROUND 1 INCH PER HOUR IN THIS BAND  
WILL LIKELY OCCUR THROUGH THE REMAINDER OF THE EVENING AND CONTINUE  
THROUGH THE OVERNIGHT HOURS. AS THE SHORTWAVE TROUGH DEVELOPS  
EASTWARD, THE MODERATE TO HEAVY SNOW BAND WILL SHIFT EASTWARD INTO  
SOUTHERN WI AND NORTHERN IL (INCLUDING THE CHICAGO METRO), MAINLY  
AFTER 05Z.  
 
..GLEASON.. 02/09/2018  
   
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
 
 
ATTN...WFO...LOT...MKX...DVN...ARX...DMX...FSD...OAX...  
 
LAT...LON 41999517 42069591 42389617 42759576 42939447 43079144  
42958858 42758768 42318769 41838750 41328771 41358837  
41669002 41859140 41949291 42029446 41999517  
 
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