MESOSCALE DISCUSSION 1078
   NWS STORM PREDICTION CENTER NORMAN OK
   0532 AM CDT THU MAY 29 2008
   
   AREAS AFFECTED...ERN NEB...WRN IA...EXTREME SERN SD
   
   CONCERNING...OUTLOOK UPGRADE 
   
   VALID 291032Z - 291230Z
   
   MUCH OF ERN NEB...WRN IA...AND EXTREME SERN SD WILL BE UPGRADED TO A
   HIGH RISK AT 13Z TODAY.
   
   ...PUBLIC SEVERE WEATHER OUTLOOK...
   
   A STRONG UPPER TROUGH IS CURRENTLY MOVING ACROSS PARTS OF
   UTAH/ARIZONA...AND WILL TRACK INTO THE CENTRAL PLAINS BY LATE THIS
   AFTERNOON.  AHEAD OF THIS SYSTEM...STRONG SOUTHERLY LOW LEVEL WINDS
   ARE DRAWING A VERY MOIST AND UNSTABLE AIRMASS NORTHWARD INTO THE
   CENTRAL PLAINS.  THUNDERSTORMS ARE EXPECTED TO DEVELOP AND RAPIDLY
   BECOME SEVERE OVER PARTS OF CENTRAL NEBRASKA...NORTH CENTRAL
   KANSAS...AND SOUTH CENTRAL SOUTH DAKOTA BY MID/LATE AFTERNOON. 
   THESE STORMS WILL LIKELY BE SUPERCELLS CAPABLE OF VERY LARGE
   HAIL...DAMAGING WINDS...AND TORNADOES.  ACTIVITY WILL INCREASE IN
   COVERAGE AND INTENSITY THROUGH THE EVENING AS THUNDERSTORMS SPREAD
   INTO PARTS OF WESTERN IOWA AND SOUTHWEST MINNESOTA.  THE COMBINATION
   OF A VERY UNSTABLE AIRMASS AND STRONG VEERING/INCREASING WINDS WITH
   HEIGHT INDICATE A RISK OF STRONG TORNADOES OVER THE REGION THIS
   AFTERNOON AND EVENING.
   
   ..JEWELL/HART.. 05/29/2008
   
   
   ATTN...WFO...DMX...FSD...OAX...GID...LBF...
   
   40919863 41769911 42529868 43159769 43379668 43349489
   42809455 41919470 40889569 40609670 40529776