MESOSCALE DISCUSSION 0737
   NWS STORM PREDICTION CENTER NORMAN OK
   0231 PM CDT WED MAY 11 2011
   
   AREAS AFFECTED...ERN NEB/WRN IA
   
   CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY 
   
   VALID 111931Z - 112030Z
   
   THREAT FOR SUPERCELLS...POTENTIALLY TORNADIC...COULD EVOLVE ACROSS
   PORTIONS OF ERN NEB AND WRN IA. AS SUCH...A TORNADO WATCH IS
   LIKELY...UPGRADING NERN PORTIONS OF SVR TSTM WATCH 279.
   
   A WARM FRONT DRAPED ACROSS ERN NEB AND WRN IA COULD SERVE AS THE
   FOCUS FOR SUPERCELLS. STRONG INSTABILITY NEAR AND SOUTH OF THE
   FRONT...JUXTAPOSED WITH EFFECTIVE SRH VALUES AOA 200 M2/S2 WILL
   SUPPORT THE THREAT FOR TORNADOES...ALONG WITH DMGG WINDS AND LARGE
   HAIL. THIS THREAT EVIDENT WITH THE SUPERCELL ENTERING ADAMS COUNTY
   IA.
   
   ..COHEN.. 05/11/2011
   
   
   ATTN...WFO...DMX...FSD...OAX...
   
   LAT...LON   40599539 40769693 41679745 42419678 42529510 42059408
               41139409 40599539