MESOSCALE DISCUSSION 0082
   NWS STORM PREDICTION CENTER NORMAN OK
   0233 AM CST WED FEB 02 2011
   
   AREAS AFFECTED...LOWER MI...NE IL...SERN WI
   
   CONCERNING...BLIZZARD 
   
   VALID 020833Z - 021230Z
   
   MATURE AND IMPRESSIVE MID-LEVEL CYCLONE CONTINUES TO ACCELERATE NEWD
   THROUGH NRN IND WITH ATTENDANT LOW/MID-LEVEL DRY SLOT ADVANCING NEWD
   INTO SRN/SERN LOWER MI.  ALONG N EDGE OF THIS DRY SLOT...INTENSE
   MID-LEVEL FRONTOGENETIC FORCING AND A COUPLE HUNDRED J/KG OF MUCAPE
   WERE RESULTING IN MULTIBANDS OF MESOSCALE SNOWFALL /INCLUDING
   THUNDER/ OVER CNTRL LOWER MI AND THE THUMB AREA. THIS REGION WILL
   EXPERIENCE THE HEAVIEST SNOWFALL RATES BEFORE 12Z...WITH RATES
   DIMINISHING THEREAFTER AS STRONGER FORCING SPREADS INTO SWRN
   ONTARIO.
   
   MEANWHILE...VIRTUALLY ALL THE MESOSCALE MODELS
   /HRRR-NMM-ARW-NSSL-RUC12/ SUGGEST THAT A PERSISTENT MESOSCALE
   SNOWBAND...RESULTING FROM A COMBINATION OF RESIDUAL MID-LEVEL
   FRONTOGENESIS AND ENHANCED LAKE EFFECT FETCH...WILL EXIST ACROSS
   CHICAGOLAND AND EXTREME SERN WI...THROUGH AROUND 15Z.  WHILE THE
   WIDESPREAD 1-2 INCH PER HOUR RATES WILL DIMINISH WITH TIME WITHIN
   THE DEFORMATION AXIS...NARROW INTENSE SNOWBANDS MAY LINGER FOR A
   WHILE LONGER.
   
   INTENSE PRESSURE GRADIENT OBSERVED ACROSS THE REGION WILL MAINTAIN
   BLIZZARD CONDITIONS...PARTICULARLY ACROSS THE LAKESHORE AREAS OF SE
   WI AND NE IL THROUGH MID-MORNING.
   
   ..RACY.. 02/02/2011
   
   
   ATTN...WFO...DTX...APX...GRR...LOT...MKX...DVN...
   
   LAT...LON   42598477 42258659 41598749 41428825 41408907 41938948
               43088796 43688710 45478300 44028156 42938347 42598477