MESOSCALE DISCUSSION 1249
   NWS STORM PREDICTION CENTER NORMAN OK
   0857 PM CDT FRI JUN 19 2009
   
   AREAS AFFECTED...SRN LOWER MICH
   
   CONCERNING...HEAVY RAINFALL 
   
   VALID 200157Z - 200300Z
   
   HEAVY RAINFALL RATES UP TO 3 INCHES/HOUR ARE POSSIBLE ACROSS SRN
   LOWER MICH FOR THE NEXT FEW HOURS ENDING GENERALLY FROM W TO E.
   
   RADAR MOSAIC AS OF 0155Z SHOWS AN INTENSE BAND OF TSTMS ACROSS LOWER
   MICH FROM ALLEGAN COUNTY E TOWARDS LAKE ST. CLAIR.  THIS ACTIVITY IS
   AHEAD OF A MESO LOW APPROXIMATELY 25 MI N OF BEH IN ASSOCIATION WITH
   EXPANSIVE SRN GREAT LAKES MCS.  00Z DTX RAOB SHOWED PRECIPITABLE
   WATER VALUE OF 1.65 INCHES TO THE N OF AN EFFECTIVE SURFACE WARM
   FRONT/OUTFLOW BOUNDARY OVER NRN IND.  SELY SURFACE TRAJECTORY OF
   UPPER 60S DEWPOINTS WILL MAINTAIN A MOIST LOW LEVEL INFLUX AS STORMS
   GENERALLY RESIDE ALONG WARM ADVECTION WING TO LARGER SCALE LEWP. 
   THE TSTMS COLD POOL/S WILL STRENGTHEN WITH TIME SHUNTING SOME OF THE
   HEAVIER RAINFALL RATES FURTHER S OVER THE WRN 2/3RDS OF THE
   HIGHLIGHTED AREA.
   
   ..SMITH.. 06/20/2009
   
   
   ATTN...WFO...DTX...GRR...
   
   LAT...LON   42218315 42528452 42278581 42458598 42688575 42858488
               42918426 42788343 42628298 42448293 42218315