MESOSCALE DISCUSSION 0483
   NWS STORM PREDICTION CENTER NORMAN OK
   1047 PM CDT TUE APR 19 2011
   
   AREAS AFFECTED...NERN IND THROUGH NRN OH
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 158...
   
   VALID 200347Z - 200445Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 158
   CONTINUES.
   
   THREAT FOR ISOLATED DAMAGING WIND CONTINUES WITH STORMS MOVING EWD
   THROUGH NWRN OH. STORMS WILL BEGIN TO MOVE EAST OF WW 158 BY 0430Z.
   AREA DOWNSTREAM ACROSS NRN OH IS BEING MONITORED FOR A POSSIBLE WW.
   
   BOWING LINE OF STORMS IS MOVING INTO NWRN OH AT 50 KT. ACTIVITY IS
   ROOTED ABOVE A STABLE BOUNDARY LAYER WITH TEMPERATURES IN THE LOW
   40S WHICH COULD TEMPER OVERALL SEVERE THREAT. NEVERTHELESS...RUC
   PFCS INDICATE THE STABLE LAYER IS RATHER SHALLOW AND ISOLATED STRONG
   TO DAMAGING GUSTS COULD STILL REACH THE SURFACE. THE BOUNDARY LAYER
   FARTHER EAST ACROSS N-CNTRL THROUGH NERN OH IS NOT AS STABLE WITH
   TEMPERATURES IN MID 50S TO NEAR 60...AND TEMPERATURES MAY RISE
   FURTHER AS THE WARM FRONT LIFTS NWD. A 60+ KT LLJ WILL MAINTAIN FEED
   OF HIGHER THETA-E AIR WHICH COMBINED WITH A TENDENCY FOR THE
   BOUNDARY LAYER TO DESTABILIZE NWD WITH TIME COULD MAINTAIN A THREAT
   FOR DAMAGING WIND ACROSS THE REMAINDER OF NRN OH.
   
   ..DIAL.. 04/20/2011
   
   
   ATTN...WFO...PBZ...CLE...ILN...IWX...
   
   LAT...LON   40708392 41068435 41568440 41708407 41518325 41298204
               41388070 40448100 40708392