MESOSCALE DISCUSSION 0460
   NWS STORM PREDICTION CENTER NORMAN OK
   0253 PM CDT TUE APR 15 2003
   
   AREAS AFFECTED...CENTRAL WI
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 151953Z - 152300Z
   
   THUNDERSTORMS WILL INCREASE IN COVERAGE AND INTENSITY THROUGH THE
   AFTERNOON HOURS.  A WW MAY BE NECESSARY.
   
   LATEST SURFACE ANALYSIS SHOWS E/W ORIENTED FRONTAL BOUNDARY FROM
   CENTRAL MN INTO CENTRAL WI.  TEMPERATURES S OF THIS BOUNDARY WERE
   VERY WARM IN THE 80S WITH DEWPOINTS INTO THE MID 50S F.  12Z GRB
   RAOB SHOWED WARM AIR ALOFT...BUT A RELATIVELY DEEP LAYER OF
   MOISTURE UP TO NEAR 700 MB.  FORECAST SOUNDINGS SHOW INCREASING
   MOISTURE IN THE 850-700 MB LAYER THROUGH EARLY EVENING...AS
   FRONTAL BOUNDARY SHARPENS AND UVVS INCREASE ALONG IT.  GIVEN
   STEEP LAPSE RATES ALOFT AND DEEP LAYER SHEAR...THUNDERSTORMS
   ORIENTED ALONG THE BOUNDARY ARE EXPECTED TO PRODUCE HAIL...WITH
   DAMAGING WINDS INCREASINGLY LIKELY ONCE STORMS HAVE BEEN
   PERSISTENT ENOUGH TO PRODUCE A COLD POOL.
   
   ..JEWELL.. 04/15/2003
   
   
   ATTN...WFO...GRB...MKX...ARX...MPX...
   
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