MESOSCALE DISCUSSION 1771
   NWS STORM PREDICTION CENTER NORMAN OK
   0847 AM CDT TUE AUG 04 2009
   
   AREAS AFFECTED...PARTS OF CNTRL-SERN IND / NRN KY / EXTREME SWRN OH
   
   CONCERNING...HEAVY RAINFALL 
   
   VALID 041347Z - 041445Z
   
   HEAVY RAINFALL RATES WILL BE POSSIBLE DURING THE MORNING HOURS OVER
   PARTS OF CENTRAL IND EXTENDING SEWD INTO PARTS OF NRN KY/SWRN OH. 
   ISOLD RAINFALL RATES MAY EXCEED 3 INCHES PER HOUR IN LOCALES WITH 2
   INCHES PER HOUR LIKELY WHERE TRAINING STORMS RESIDE.
   
   13Z SURFACE ANALYSIS SHOWS A VERY MOIST AIRMASS LOCATED ACROSS THE
   LOWER WABASH AND LOWER-MID OH RIVER VALLEYS WITH DEWPOINTS IN THE
   LOWER TO MID 70S S OF A DIFFUSE WARM FRONTAL BOUNDARY DRAPED FROM
   CNTRL IL SEWD TOWARDS THE LOUISVILLE METRO.  RADAR MOSAIC TRENDS
   OVER THE PAST HOUR SHOW FORWARD PROPAGATING MCS OVER THE MIDDLE OH
   RIVER VALLEY CONTINUES TO MOVE SEWD INTO PARTS OF WV AND ERN KY.  IN
   ITS WAKE...LOW LEVEL BAROCLINIC ZONE/UPGLIDE OVERTOP RESIDUAL COLD
   POOL WILL CONTINUE TO PROVIDE A LOW LEVEL FOCUS FOR CONTINUED
   VIGOROUS TSTM DEVELOPMENT.  12Z ILX RAOB SAMPLED THIS MOIST/VERY
   UNSTABLE INFLOW AIRMASS TO THE W OF THE ONGOING STORM CLUSTER WITH
   PRECIPITABLE WATER VALUES IN EXCESS OF 2 INCHES AND 20-40 KT WLY H85
   JET PER AREA VWP DATA WILL MAINTAIN MOIST FLUX INTO REGION.  THIS
   WILL SUPPORT TRAINING/BACKBUILDING STORMS FOR THE NEXT FEW
   HOURS...PARTICULARLY ACROSS CNTRL-SERN IND.
   
   ..SMITH.. 08/04/2009
   
   
   ATTN...WFO...ILN...LMK...IND...
   
   LAT...LON   37988586 38198613 39148608 39588661 39928711 40188697
               40068615 39898532 39528449 38998438 38428475 37968547
               37988586