MESOSCALE DISCUSSION 0727
   NWS STORM PREDICTION CENTER NORMAN OK
   0407 AM CDT WED MAY 11 2011
   
   AREAS AFFECTED...WRN OH TO ERN KY
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 275...
   
   VALID 110907Z - 111000Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 275
   CONTINUES.
   
   AN ISOLATED STRONG TO SEVERE STORM REMAINS POSSIBLE OVER WRN
   OH...BUT THE OVERALL DECREASE IN COVERAGE OF STRONGER STORMS ACROSS
   WW 275 SHOULD ALLOW THIS WATCH TO EXPIRE AT 07Z.
   
   AT 09Z...REGIONAL RADAR IMAGERY SHOWED THE STRONGEST STORM LOCATED
   OVER THE FAR NRN EXTENT OF WW 275 IN WRN OH /HARDIN COUNTY/.  NEW
   TSTMS CONTINUE TO DEVELOP OVER THIS PORTION OF WEST CENTRAL OH WHICH
   APPEARS TO BE RECEIVING A FEED OF ELEVATED MODERATE INSTABILITY PER
   WLY LOW LEVEL WINDS ACROSS NRN IND INTO OH.  DESPITE THE AVAILABLE
   INSTABILITY...WEAKENING EFFECTIVE BULK SHEAR AS A SHORTWAVE TROUGH
   MOVES FARTHER SSEWD AWAY FROM THIS REGION SHOULD LIMIT THE POTENTIAL
   FOR ORGANIZATION AND MAINTAIN A DECREASING SEVERE WEATHER THREAT.
   
   MEANWHILE...ACROSS THE REST OF WW 275...REGIONAL RADAR AND LIGHTNING
   TRENDS SHOWED A SUBSTANTIAL DECREASE IN TSTM ACTIVITY WITH THE
   SECOND AREA OF GREATER COVERAGE LOCATED ACROSS THE FAR SRN EXTENT OF
   THIS WATCH IN SERN KY.  THIS ACTIVITY IS LIKELY MORE CLOSELY TIED TO
   FORCING FOR ASCENT ATTENDANT TO THE MIDLEVEL IMPULSE TRACKING SWD
   ACROSS THE CENTRAL APPALACHIANS.  HOWEVER...CONVECTIVE TRENDS SHOWED
   A LACK OF STRONGER CORES/UPDRAFTS OVER THIS AREA SINCE 0830Z AND
   THIS MAY BE A RESULT OF THE AFOREMENTIONED IMPULSE LOSING ITS
   INFLUENCE ACROSS SERN KY AS IT TRACKS SSEWD.
   
   ..PETERS.. 05/11/2011
   
   
   ATTN...WFO...RLX...CLE...JKL...ILN...LMK...IWX...
   
   LAT...LON   37538203 36998297 37098324 37948381 39178424 40678443
               40788349 40428329 39578312 39498279 38888268 38068252
               37538203