MESOSCALE DISCUSSION 1209, AREAS AFFECTED...ERN UPPER/NRN LOWER MI CONCERNING...SEVERE THUNDERSTORM WATCH 406

        MESOSCALE DISCUSSION 1209     NWS STORM PREDICTION CENTER NORMAN OK     0350 PM CDT MON JUN 18 2012          AREAS AFFECTED...ERN UPPER/NRN LOWER MI          CONCERNING...SEVERE THUNDERSTORM WATCH 406...          VALID 182050Z - 182215Z          THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 406     CONTINUES.          SUMMARY...DOWNSTREAM WW ISSUANCE WILL BE CONSIDERED IN THE NEXT     COUPLE OF HOURS AS MCS OVER NERN WI/ERN UPPER MI IS EXTRAPOLATED TO     REACH NRN LOWER MI BETWEEN 23-00Z.          DISCUSSION...IN THE WAKE OF EARLIER CONVECTIVE DEBRIS...NEARLY     CLOUD-FREE SKIES HAS RESULTED IN STRONG HEATING WITH TEMPERATURES     WARMING GENERALLY THROUGH THE 80S IN LOWER MI. ALTHOUGH BUOYANCY IS     LIKELY NOT AS GREAT AS W OF LK MI GIVEN THE OVERTURNING EARLIER THIS     MORNING...CONTINUED HEATING MAY SUPPORT ONGOING ACTIVITY BEING     SUSTAINED AS IT CROSS THE LK INTO NRN LOWER MI. PRIMARY RISK SHOULD     BE DAMAGING WIND AS STRONG UNIDIRECTIONAL DEEP-LAYER SHEAR MAY YIELD     BOWING LINE SEGMENTS.          ..GRAMS.. 06/18/2012               ATTN...WFO...APX...GRR...GRB...          LAT...LON   44478762 45198712 46008573 46298443 46158369 45848335                 45488318 45068326 44728364 44498412 44368457 43978585                 43928658 44178734 44478762