MESOSCALE DISCUSSION 1227
   NWS STORM PREDICTION CENTER NORMAN OK
   0133 AM CDT FRI JUN 19 2009
   
   AREAS AFFECTED...EASTERN NEB TO WESTERN/CENTRAL IA
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 190633Z - 190730Z
   
   SEVERE TSTMS ARE EXPECTED TO DEVELOP/INCREASE FROM EASTERN NEB INTO
   WESTERN/CENTRAL IA THROUGH THE EARLY MORNING HOURS. A WATCH MAY BE
   NEEDED SOON.
   
   AN INCREASING SEVERE THREAT IS EXPECTED THROUGH THE EARLY MORNING
   HOURS FROM CENTRAL/EASTERN NEB INTO WESTERN/CENTRAL IA. RECENT
   DEVELOPMENT HAS OCCURRED OVER THE PAST HALF HOUR ALONG I-80 IN
   EASTERN NEB AHEAD OF ONGOING SEVERE TSTMS IN CENTRAL NEB. GRADUAL
   LARGE SCALE HEIGHT FALLS...IN ADDITION TO AN INCREASING
   SOUTHWESTERLY LOW LEVEL JET /ALREADY 35-40 KT ACROSS KS/ AND
   ASSOCIATED MOISTURE TRANSPORT REGIME...WILL FAVOR BOTH INCREASING
   QUASI-DISCRETE SEVERE TSTMS/SUPERCELLS AND POTENTIAL EVENTUAL STORM
   MERGERS/UPSCALE GROWTH INTO AN MCS. THIS ACTIVITY WILL TEND TO BE
   FOCUSED IN A RATHER UNSTABLE AIRMASS ALONG/NORTH OF AN EFFECTIVE
   BOUNDARY FROM CENTRAL NEB EAST-NORTHEASTWARD INTO CENTRAL IA.
   
   ..GUYER.. 06/19/2009
   
   
   ATTN...WFO...DMX...FSD...OAX...
   
   LAT...LON   41999707 43189432 42449264 41209379 40309699 41999707