MESOSCALE DISCUSSION 0873
   NWS STORM PREDICTION CENTER NORMAN OK
   0742 PM CDT SUN MAY 22 2011
   
   AREAS AFFECTED...NRN WI INTO WRN UPPER MI
   
   CONCERNING...TORNADO WATCH 331...
   
   VALID 230042Z - 230145Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 331 CONTINUES.
   
   A SMALL WINDOW EXIST NEXT 30 MIN OR SO FOR AN ISOLATED TORNADO OVER
   EXTREME NRN WI INTO WRN UPPER MI...BUT OVERALL THREAT IS BECOMING
   INCREASINGLY MARGINAL.
   
   A BRIEF TORNADO REMAINS POSSIBLE AS STORMS CROSS THE BOUNDARY OVER
   EXTREME NRN WI INTO WRN PARTS OF LOWER MI WHERE SHEAR PROFILES AND
   HODOGRAPHS REMAIN FAVORABLE. HOWEVER...THE BOUNDARY LAYER HAS BEEN
   STABILIZED BY PREVIOUS AND ONGOING CONVECTION...AND WITH LOSS OF
   DIABATIC WARMING...OVERALL THREAT SHOULD CONTINUE TO WANE.
   
   ..DIAL.. 05/23/2011
   
   
   ATTN...WFO...MQT...GRB...DLH...
   
   LAT...LON   45708793 45798916 45849032 46289040 46448913 46118772
               45708793