MESOSCALE DISCUSSION 1033
   NWS STORM PREDICTION CENTER NORMAN OK
   0547 PM CDT MON MAY 30 2011
   
   AREAS AFFECTED...NERN CO/WRN NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 404...
   
   VALID 302247Z - 302345Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 404
   CONTINUES.
   
   THREAT OF DMGG WINDS AND PERHAPS AN ISOLATED/BRIEF TORNADO PERSISTS
   OVER NERN CO AND WRN NEB.
   
   A LEADING SHORT WAVE CLEARLY OBSERVED ON WV IMAGERY NEAR THE SERN
   WY/NERN CO AND WRN NEB BORDER AS OF 2230Z HAS LED TO AN INCREASE IN
   POST-FRONTAL CONVECTION ACROSS NERN CO...NOW PROGRESSING ENEWD INTO
   WRN NEB. VERY STRONG EFFECTIVE SHEAR /IN EXCESS OF 75 KTS/ WITH THE
   APPROACH OF AN UPPER TROUGH AND PRESENCE OF STEEP MID LEVEL LAPSE
   RATES HAS LED TO OCCASIONAL ROTATION IN RECENTLY OBSERVED
   STORMS...PRIMARILY THOSE THAT INTERCEPT EXISTING BOUNDARIES /COLD
   FRONT AND AN OUTFLOW BOUNDARY THAT HAS SURGED EWD/ WHERE ENHANCED
   LOW LEVEL SRH EXISTS. ALTHOUGH THE WRN PORTION OF CONVECTION HAS
   BEEN UNDERCUT BY AN OUTFLOW BOUNDARY THAT SURGED WELL AHEAD...MODEL
   CONSENSUS INDICATES THIS ACTIVITY WILL BE REINVIGORATED AS THE COLD
   FRONT MERGES WITH THE DRYLINE...AND SUBSEQUENTLY PROGRESSES ENEWD
   TOWARDS GREATER INSTABILITY ACROSS CNTRL NEB TOWARDS TORNADO WW 402.
   
   ..HURLBUT.. 05/30/2011
   
   
   ATTN...WFO...LBF...GLD...BOU...CYS...
   
   LAT...LON   39570206 39580284 40420331 40550358 40990356 40980262
               41990257 42050201 42980211 42979943 42159991 42030027
               41750026 41640069 41400069 41410122 40710124 40690077
               40310074 40340123 40020129 40000199 39570206