MESOSCALE DISCUSSION 0422
   NWS STORM PREDICTION CENTER NORMAN OK
   0224 AM CDT WED APR 10 2013
   
   AREAS AFFECTED...CENTRAL INTO PART OF SRN WI
   
   CONCERNING...FREEZING RAIN 
   
   VALID 100724Z - 101230Z
   
   SUMMARY...A PROLONGED 3-6 HOUR FREEZING RAIN EVENT IS EXPECTED TO
   PERSIST INTO THE EARLY MORNING HOURS...ESPECIALLY FOR PORTIONS OF
   CENTRAL TO ERN WI WITHIN THE DISCUSSION AREA.  LOCATIONS INVOF OF
   THE MS RIVER VALLEY IN FAR SERN MN AND ADJACENT WI COUNTIES...MAY
   HAVE A SHORTER DURATION OF FREEZING RAIN AS SURFACE TEMPERATURES
   FALL BELOW 32 F BETWEEN 09-12Z.
   
   DISCUSSION...TRENDS IN SURFACE OBSERVATIONS DURING THE EARLY
   OVERNIGHT PERIOD SHOWED TEMPERATURES E OF THE MS RIVER INTO CENTRAL
   TO ERN WI WERE AT OR JUST BELOW 32 F...WITH THESE VALUES GENERALLY
   IN AN AREA FROM KCMY /SPARTA WI/ TO KETB /OR 35 NNW KMKE/ AND FROM
   WEST CENTRAL WI TO THE DOOR PENINSULA.  SURFACE TEMPERATURES FROM
   KMSN TO 30 E MSN AT KRYV ARE FALLING AND HAVE REACHED 33 F AT 07Z. 
   THE SWD TREND WITH TEMPERATURES FALLING WILL PERSIST AS INDICATED BY
   THE 00Z ECMWF/NAM.  REGIONAL RADAR IMAGERY AND CONFIRMED BY SURFACE
   OBSERVATIONS INDICATED LIGHT TO MODERATE FREEZING RAIN ONGOING
   ACROSS THIS PART OF WI WITH RATES RANGING FROM 0.1-0.25 INCH PER
   HOUR.
   
   40-45 KT SSWLY LOW LEVEL WINDS EXTENDING INTO NRN IL/SRN WI WILL
   MAINTAIN A ZONE OF WAA ACROSS THE DISCUSSION AREA...SUPPORTING THE
   SHOWERS AND EMBEDDED TSTMS.  REGIONAL RADAR IMAGERY INDICATED THE
   BACK EDGE OF THIS ROUND OF PRECIPITATION...CURRENTLY LOCATED IN SERN
   MN...SHOULD REACH WOOD/MARATHON COUNTIES WI TO SAUK COUNTY WI BY
   09-11Z...WITH LOCATIONS FARTHER E TO THE COUNTIES ALONG THE WRN
   SHORE OF LAKE MI EXPERIENCING A LONGER DURATION OF FREEZING RAIN. 
   THE TIMING OF THE WRN EDGE OF THE PRECIPITATION REACHING THE
   AFOREMENTIONED PORTIONS OF WI IS SUPPORTED BY THE 00Z 4 KM WRF-NMM
   AND NSSL. MEANWHILE...THE 10/00Z AFWA AND 09/12Z SSEO ENSEMBLES
   SUPPORTED THE EXPECTED PRECIP TYPES BEING PRIMARILY FREEZING RAIN
   WITH SOME SLEET MIXED IN WITH NWD EXTENT.
   
   ..PETERS.. 04/10/2013
   
   
   ATTN...WFO...GRB...MKX...ARX...
   
   LAT...LON   44649039 44628862 44678811 44758741 44208747 43638769
               43358808 43248886 43319036 43519118 43919145 44119190
               44459170 44649039