EASTERN PORTIONS OF SEVERE THUNDERSTORM WATCH 406 MAY BE REPLACED BY A TORNADO WATCH

        MESOSCALE DISCUSSION 1208     NWS STORM PREDICTION CENTER NORMAN OK     0249 PM CDT MON JUN 18 2012          AREAS AFFECTED...NERN/CNTRL WI          CONCERNING...SEVERE THUNDERSTORM WATCH 406...          VALID 181949Z - 182115Z          THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 406     CONTINUES.          SUMMARY...PORTIONS OF WW 406 CENTERED OVER NERN WI ARE BEING     CONSIDERED FOR REPLACEMENT WITH A TORNADO WATCH. THIS MAY BE     REQUIRED IF MORE INTENSE/SUSTAINED SUPERCELLS BECOME NOTED.          DISCUSSION...SEVERAL SEMI-DISCRETE CELLS WERE PREVALENT WITHIN A     WSW/ENE-ORIENTED PRE-FRONTAL CONFLUENT BAND FROM 40 W CWA TO NEAR     ESC. REMNANT OUTFLOW BOUNDARY/COMPOSITE WARM FRONT INTERSECTS THIS     ACTIVITY FROM MARATHON TO SHEBOYGAN COUNTIES. ALTHOUGH THE HODOGRAPH     IS FAIRLY STRAIGHT-LINE...STRONG LOW-LEVEL SPEED SHEAR REMAINS NEAR     THIS JUXTAPOSITION /AROUND 35 KT FROM 0-1 KM IN THE GRB VWP DATA/.     ADDITIONAL SHOWERS FORMING S OF THE ONGOING ACTIVITY WOULD LIKELY     POSE THE GREATEST RISK FOR DEVELOPING SUSTAINED LOW-LEVEL     MESOCYCLONES...WHICH MAY BE SUFFICIENT FOR A TORNADO THREAT DURING     THE NEXT FEW HOURS.          ..GRAMS.. 06/18/2012               ATTN...WFO...MQT...GRB...          LAT...LON   45308877 45488796 45288769 44888728 44358742 44068787                 43998838 44048886 44288952 44738974 44928971 45308877