MESOSCALE DISCUSSION 0041
   NWS STORM PREDICTION CENTER NORMAN OK
   0535 AM CST SAT JAN 17 2009
   
   AREAS AFFECTED...NE WI...UPPER AND LOWER MI
   
   CONCERNING...HEAVY SNOW 
   
   VALID 171135Z - 171530Z
   
   SNOW WILL INCREASE FROM NORTHWEST TO SOUTHEAST ACROSS UPPER MI...NE
   WI AND LOWER MI THIS MORNING. SNOWFALL RATES COULD REACH 1 INCH PER
   HOUR IN SOME LOCATIONS ESPECIALLY LATE THIS MORNING AS LIFT AND
   MOISTURE BECOME MAXIMIZED ACROSS THE MCD AREA.
   
   LATEST WATER VAPOR IMAGERY SHOWS A FAST-MOVING SHORTWAVE TROUGH
   ORIENTED NNE TO SSW ACROSS ERN MN. THE LEADING EDGE OF ASCENT
   ASSOCIATED WITH THE SHORTWAVE TROUGH IS LOCATED IN NRN WI AND THIS
   WILL SPREAD SEWD ACROSS ERN WI INTO NRN LOWER MI OVER THE NEXT 2 TO
   4 HOURS. ALTHOUGH SFC DEWPOINTS ARE ONLY IN THE SINGLE DIGITS ACROSS
   MUCH OF THE AREA...DEWPOINTS MAY RISE SLOWLY DUE TO SLY FLOW AHEAD
   OF SFC LOW APPROACHING FROM THE WEST. IN ADDITION...FORECAST
   SOUNDINGS ACROSS THE MCD AREA INCREASE MID-LEVEL MOISTURE MAINLY IN
   THE 800 TO 700 MB LAYER AS THE SHORTWAVE TROUGH APPROACHES. THIS
   COMBINED WITH THE STRONG LIFT SHOULD RESULT IN BANDS OF HEAVY SNOW.
   SNOWFALL RATES COULD APPROACH 1 INCH PER HOUR IN THE MORE INTENSE
   BANDS ESPECIALLY LATE THIS MORNING AS THE AXIS OF THE SHORTWAVE
   TROUGH PASSES ACROSS THE AREA.
   
   ..BROYLES.. 01/17/2009
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
   SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
   TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
   FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
   
   ATTN...WFO...DTX...APX...GRR...MQT...GRB...
   
   LAT...LON   42958491 43298637 44268783 45418923 46308920 46758831
               46668717 45728497 44568389 42958491