MESOSCALE DISCUSSION 1283
   NWS STORM PREDICTION CENTER NORMAN OK
   0443 AM CDT TUE JUN 23 2009
   
   AREAS AFFECTED...NORTHWEST/NORTH CENTRAL NEB AND SOUTHERN/EASTERN SD
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 494...
   
   VALID 230943Z - 231115Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 494
   CONTINUES.
   
   SEVERE TSTM WATCH 494 CONTINUES UNTIL 13Z...WITH A CONTINUED
   DAMAGING WIND/SOME HAIL THREAT THROUGH THE EARLY MORNING HOURS. AN
   ADDITIONAL SEVERE TSTM WATCH IS BEING CONSIDERED FOR PORTIONS OF
   SOUTHERN/EASTERN SD.
   
   SOUTHERN PORTION OF THE SEVERE-WIND PRODUCING QUASI-LINEAR MCS HAS
   WANED/GUSTED OUT ACROSS WEST CENTRAL NEB...BUT THE NORTHERN PORTION
   OF THE LINE /CURRENTLY ACROSS BENNETT COUNTY SD AS OF 0930Z/
   CONTINUES TO POSE THE BRUNT OF A DAMAGING WIND/SOME HAIL THREAT INTO
   FAR SOUTHWEST/SOUTH CENTRAL SD. A 38 KT WIND GUST WAS MEASURED AT
   PINE RIDGE AS OF 0838Z. THIS NORTHERN PORTION OF THE MCS MAY
   CONTINUE TO THRIVE /WITH ADDITIONAL NORTH-PERIPHERAL DEVELOPMENT
   POSSIBLE/ INTO SOUTH CENTRAL/EASTERN SD...FAVORING A
   SOUTHWEST-NORTHEAST ORIENTED FRONTAL ZONE/INSTABILITY GRADIENT
   ACROSS SD WITHIN A HIGHLY SHEARED REGIME. AN ADDITIONAL SEVERE TSTM
   WATCH COULD BE NEEDED FOR PORTIONS OF CENTRAL/EASTERN SD THIS
   MORNING.
   
   ..GUYER.. 06/23/2009
   
   
   ATTN...WFO...FSD...ABR...LBF...UNR...
   
   LAT...LON   41860170 43970230 45599875 43569721 42659972 41440076
               41860170