MESOSCALE DISCUSSION 0209
   NWS STORM PREDICTION CENTER NORMAN OK
   0634 AM CST SUN FEB 25 2007
   
   AREAS AFFECTED...NERN WI...PORTIONS OF SRN UPPER MI
   
   CONCERNING...HEAVY SNOW 
   
   VALID 251234Z - 251530Z
   
   BANDED MODERATE TO HEAVY SNOW SHOULD CONTINUE TO DIMINISH THROUGH
   THE MORNING HOURS WHILE LIFTING SLOWLY NWD. SNOWFALL RATES AROUND 1
   IN/HR REMAIN LIKELY THROUGH 16Z.
   
   SURFACE OBSERVATIONS AND REGIONAL RADAR IMAGERY HAVE INDICATED A
   STEADY NWD PROGRESSION OF HEAVY SNOW OVER THE PAST SEVERAL HOURS
   ACROSS NRN WI...WITH THE HEAVIEST ACTIVITY NOW NE OF A GRB TO AUW
   LINE. EXPANSION SHOULD SLOW AS SIGNIFICANT DRY AIR LIKELY REMAINS IN
   THE 850 TO 700 MB LAYER OVER THE NRN/ERN PORTIONS OF THE U.P. /PER
   UPSTREAM 12Z APX RAOB/. IR SATELLITE IMAGERY HAS SHOWN SUBSTANTIAL
   CLOUD TOP WARMING AS LARGE-SCALE MID-LEVEL FORCING WEAKENED
   OVERNIGHT. ALTHOUGH VERTICALLY STACKED CYCLONE OVER CNTRL IA WILL
   GRADUALLY WEAKEN...STRONG LOW-LEVEL ISENTROPIC LIFT WILL CONTINUE
   WITHIN A 50 TO 60 KT LLJ /PER REGIONAL VAD PROFILERS AND 12Z
   OBSERVED RAOBS/. THIS SHOULD MAINTAIN THE HEAVY SNOW AREA FOR THE
   NEXT FEW HOURS. IN ADDITION...SUSTAINED ELY SURFACE WINDS AROUND 20
   TO 25 KTS WILL LEAD TO CONSIDERABLE BLOWING/DRIFTING IN OPEN AREAS.
   
   ..GRAMS.. 02/25/2007
   
   
   ATTN...WFO...MQT...GRB...
   
   45148928 45668911 46118855 46068775 45798699 45448653
   44998644 44388648 44168688 44208751 44398809 44728902