MESOSCALE DISCUSSION 1252
   NWS STORM PREDICTION CENTER NORMAN OK
   0214 AM CDT SAT JUN 20 2009
   
   AREAS AFFECTED...SOUTHERN/EASTERN OH AND NORTHERN KY INTO WV/WESTERN
   PA/WESTERN MD
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 484...
   
   VALID 200714Z - 200845Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 484
   CONTINUES.
   
   SEVERE TSTM WATCH 484 CONTINUES UNTIL 11Z...WITH A CONTINUED RISK
   FOR DAMAGING WINDS/SEVERE HAIL FROM SOUTHERN OH/NORTHEAST KY INTO WV
   AND WESTERN PORTIONS OF PA/MD. MONITORING FOR AN ADDITIONAL WATCH TO
   THE EAST OF WW 484.
   
   FAST MOVING SQUALL LINE /50-55 KT/ CONTINUES TO RACE EASTWARD ACROSS
   SOUTHWEST OH...ROUGHLY ALONG THE I-71 CORRIDOR AS OF 07Z. AHEAD OF
   THIS LINE...A FAIRLY WARM/MOIST BOUNDARY LAYER EXISTS WITH ONLY
   MODEST NEAR SURFACE CINH. STRENGTHENING DEEP LAYER WESTERLY FLOW PER
   REGIONAL PROFILERS/WSR-88D DERIVED WINDS...AMPLE DOWNSTREAM SURFACE
   PRESSURE FALLS NOTED ACROSS EASTERN OH/WESTERN PA...AND POTENTIAL
   FOR FAIRLY RAPID SURFACE LOW DEVELOPMENT THROUGH THE EARLY MORNING
   HOURS...ALL SUGGEST WIND GUSTS TO SEVERE LEVELS/WIND DAMAGE CANNOT
   BE RULED OUT...AND MAY POTENTIALLY INCREASE...THROUGH THE EARLY
   MORNING HOURS. ADDITIONAL/LEADING DEVELOPMENT WILL LIKELY CONTINUE
   TO OCCUR ACROSS EASTERN OH /WITH HAIL AND WIND POTENTIAL/...WITH
   OTHER STRONG/POTENTIALLY SEVERE TSTMS POSING A MAINLY HAIL THREAT
   ACROSS WESTERN PA/WESTERN MD ALONG/EAST OF A SURFACE WARM FRONT.
   WHILE WW 484 CONTINUES...REMAINING PORTIONS OF OH/WV INTO WESTERN
   PA/WESTERN MD ARE BEING MONITORED FOR AN ADDITIONAL WATCH.
   
   ..GUYER.. 06/20/2009
   
   
   ATTN...WFO...CTP...LWX...PBZ...RLX...CLE...JKL...ILN...
   
   LAT...LON   38508389 39568409 41108096 41527880 39857810 38478015
               38508389