MESOSCALE DISCUSSION 0766
   NWS STORM PREDICTION CENTER NORMAN OK
   0535 PM CDT THU MAY 12 2011
   
   AREAS AFFECTED...SOUTH-CENTRAL/EASTERN NEB AND FAR NORTHERN KS INTO
   WESTERN IA
   
   CONCERNING...TORNADO WATCH 292...
   
   VALID 122235Z - 130000Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 292 CONTINUES.
   
   TORNADO WATCH 292 CONTINUES UNTIL 03Z FOR PORTIONS OF
   SOUTH-CENTRAL/EASTERN NEB AND FAR NORTHERN KS. THE POTENTIAL
   CONTINUES FOR ISOLATED TORNADOES...IN ADDITION TO SEVERE HAIL.
   PORTIONS OF WESTERN IA ARE BEING MONITORED FOR AN ADDITIONAL WATCH.
   
   NORTH OF A SURFACE LOW NEAR THE KS/NEB BORDER...LATEST SURFACE
   ANALYSIS REFLECTS A NEARLY STATIONARY FRONTAL BOUNDARY EXTENDING
   SOUTHWEST-NORTHEASTWARD FROM SOUTH CENTRAL NEB INTO NORTH-CENTRAL
   IA...WITH DUAL COLD FRONTS ADVANCING EAST-NORTHEASTWARD ACROSS KS.
   STRONG/SEVERE TSTMS CONTINUE TO DEVELOP PRIMARILY IN AREAS JUST
   NORTH OF I-80 ACROSS SOUTH-CENTRAL NEB...NEAR THE ARCING PACIFIC
   FRONT AND SOUTHWEST-NORTHEAST FRONTAL INTERSECTION...WITH OTHER
   APPRECIABLE DEVELOPMENT ALONG THE SURFACE BOUNDARY EXTENDING INTO
   NORTHEAST NEB AND WESTERN/NORTH-CENTRAL IA.
   
   IN CLOSE PROXIMITY TO THE STACKED CENTRAL PLAINS CYCLONE...STEEP
   LAPSE RATE ENVIRONMENT/AMPLE LOW LEVEL CAPE IN THE PRESENCE OF
   AMBIENT VERTICAL VORTICITY WILL MAINTAIN THE POTENTIAL FOR
   ISOLATED/MAINLY BRIEF TORNADOES AND SEVERE HAIL THROUGH SUNSET.
   INITIALLY FOCUSED IN THE GENERAL VICINITY OF THE AURORA/YORK AREAS
   ALONG/JUST NORTH OF I-80...THE AREA OF GREATEST POTENTIAL WILL
   CONTINUE TO GRADUALLY SHIFT EASTWARD OVER THE NEXT FEW HOURS WITHIN
   A NARROW CORRIDOR OF HIGHER THETA-E AIR COINCIDENT WITH BACKED
   EAST-SOUTHEASTERLY LOW LEVEL WINDS ACROSS EASTERN NEB/FAR WESTERN
   IA. A SEVERE HAIL/ISOLATED TORNADO THREAT CANNOT BE RULED OUT INTO
   WESTERN IA...AND THIS AREA WILL CONTINUE TO BE MONITORED FOR THE
   POSSIBILITY OF AN ADDITIONAL WATCH.
   
   ..GUYER.. 05/12/2011
   
   
   ATTN...WFO...DMX...FSD...OAX...TOP...GID...
   
   LAT...LON   40559938 41119906 41999754 42419613 42529464 42189428
               41409526 40419635 39979692 39929870 40559938