MESOSCALE DISCUSSION 0422
   NWS STORM PREDICTION CENTER NORMAN OK
   1250 AM CDT FRI APR 10 2009
   
   AREAS AFFECTED...SOUTHERN IL/SOUTHERN INDIANA AND WESTERN/CENTRAL KY
   INTO MIDDLE TN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 128...
   
   VALID 100550Z - 100715Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 128
   CONTINUES.
   
   SEVERE TSTM WATCH 128 CONTINUES UNTIL 10Z...WITH A CONTINUED PRIMARY
   RISK OF SEVERE HAIL/DAMAGING WINDS. AN ADDITIONAL WATCH APPEARS
   LIKELY WITHIN THE HOUR EAST OF WW 128 INTO PORTIONS OF SOUTHERN
   INDIANA/CENTRAL KY/MIDDLE TN.
   
   EXTENSIVE MCS/BROAD SCALE BOW ECHO CONTINUES TO CROSS THE
   MISSISSIPPI RIVER...FROM THE NEAR THE CONFLUENCE WITH THE OHIO RIVER
   IN FAR SOUTHERN IL SOUTHWARD TO THE MEMPHIS VICINITY. THE DOWNSTREAM
   AIRMASS IS NOT PARTICULARLY MOIST OR UNSTABLE /MIDDLE 40S TO MIDDLE
   50S SURFACE DEWPOINTS/...BUT THE HIGHLY ORGANIZED NATURE OF THE
   MCS...PERSISTENT DOWNSTREAM SURFACE PRESSURE FALLS...AND
   STRENGTHENING FLOW AROUND 1 KM/INCREASINGLY VERTICAL SHEAR WILL
   CONTINUE TO SUSTAIN A DAMAGING WIND/HAIL THREAT OVERNIGHT INTO
   PORTIONS OF MIDDLE TN/CENTRAL KY/SOUTHERN INDIANA. AN ADDITIONAL
   WATCH WILL LIKELY BE NEEDED TO THE EAST OF WW 128.
   
   ..GUYER.. 04/10/2009
   
   
   ATTN...WFO...LMK...OHX...IND...PAH...ILX...MEG...LSX...
   
   LAT...LON   38219000 38448957 38798850 38598587 36798630 35498695
               35198780 35308894 36408891 36588981 38219000