MESOSCALE DISCUSSION 0402
   NWS STORM PREDICTION CENTER NORMAN OK
   0855 PM CDT SUN APR 10 2011
   
   AREAS AFFECTED...ERN WISCONSIN...UPPER PENINSULA OF MICHIGAN...NRN
   LWR MICHIGAN
   
   CONCERNING...TORNADO WATCH 120...121...
   
   VALID 110155Z - 110330Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 120...121...CONTINUES.
   
   THROUGH 04Z...THE CENTER OF THE DEEP AND SLOWLY DEEPENING SURFACE
   CYCLONE APPEARS LIKELY TO CONTINUE MIGRATING EAST NORTHEASTWARD
   ACROSS LAKE SUPERIOR...WITH THE TRAILING COLD FRONT PROGRESSING
   THROUGH MUCH OF THE REMAINDER OF EASTERN WISCONSIN.  FORCING
   ASSOCIATED WITH A STRONGLY DIVERGENT UPPER FLOW FIELD IS EXPECTED TO
   SPREAD ACROSS THE REMAINDER OF THE UPPER PENINSULA OF MICHIGAN AND
   NORTHERN LOWER MICHIGAN...WHICH PROBABLY WILL BE ACCOMPANIED BY
   CONTINUING CONVECTIVE DEVELOPMENT IN THE PRESENCE OF WEAK TO
   MODERATE INSTABILITY.  WITH A SOUTHWESTERLY 500 MB JET PROGGED TO
   STRENGTHEN IN EXCESS OF 100 KT AS IT NOSES NORTHEAST OF THE UPPER
   MISSISSIPPI VALLEY...AND WARM SECTOR 850 MB FLOW STRENGTHENING FROM
   50-70+ KT WHILE VEERING FROM SOUTHERLY TO SOUTHWESTERLY... POTENTIAL
   FOR STRONG DAMAGING WIND GUSTS MAY INCREASE FURTHER THIS EVENING. 
   WHILE THE TENDENCY MAY BE FOR ORGANIZING STORM
   CLUSTERS...PARTICULARLY ACROSS NORTHERN LOWER MICHIGAN...DISCRETE
   SUPERCELLS CAPABLE OF PRODUCING TORNADOES WILL REMAIN A POSSIBILITY.
   
   ..KERR.. 04/11/2011
   
   
   ATTN...WFO...APX...GRR...MQT...GRB...MKX...
   
   LAT...LON   44968802 46048791 46658797 46908734 47108515 46248389
               44918332 44258362 43858533 43738597 42838785 42958912
               44218828 44968802