MESOSCALE DISCUSSION 0157
   NWS STORM PREDICTION CENTER NORMAN OK
   1210 AM CST FRI FEB 27 2009
   
   AREAS AFFECTED...SERN WI
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 270610Z - 270815Z
   
   MIXED PRECIPITATION...INCLUDING FREEZING RAIN...WILL CONTINUE THE
   NEXT 2-3 HRS OVER PARTS OF FAR SERN WI BEFORE TRANSITIONING TO LIGHT
   SNOW BEFORE ENDING.  LIQUID EQUIVALENT RATES OF 0.02-0.05 INCH/3 HR
   PERIOD MAY OCCUR.
   
   RADAR IMAGERY TRENDS OVER THE PAST HOUR HAVE SHOWN AN INCREASE IN
   COVERAGE AND INTENSITY TO SHALLOW CONVECTIVE SHOWERS OVER SERN WI. 
   SUFFICIENT LARGE SCALE ASCENT ASSOCIATED WITH LOWER LEVEL
   FRONTOGENETICAL FORCING /NEAR 800 MB/ AND DCVA WITH MID-LEVEL
   VORTICITY MAXIMUM WILL LIKELY CONTINUE TO SUPPORT MIXED
   PRECIPITATION.  RUC FORECAST SOUNDINGS DEPICT A SATURATED SURFACE TO
   700 MB COLUMN WITH A WARM NOSE ABOVE 0 DEG C NEAR 700 MB COOLING
   CONCURRENTLY WITH COLD AIR ADVECTION WITH APPROACHING MID-LEVEL LOW.
    THIS WILL SUPPORT A TRANSITION FROM MAINLY FREEZING RAIN TO SLEET
   AND THEN LIGHT SNOW BEFORE ENDING AROUND 08-09Z INVOF MKE/LAKE MICH.
   
   ..SMITH.. 02/27/2009
   
   
   ATTN...WFO...GRB...MKX...
   
   LAT...LON   43008904 43098917 43478901 43878855 44108730 43938688
               43608695 43088741 42678805 42678868 43008904