MESOSCALE DISCUSSION 1707
   NWS STORM PREDICTION CENTER NORMAN OK
   0425 AM CDT FRI AUG 10 2007
   
   AREAS AFFECTED...CENTRAL SD TO ERN NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 578...
   
   VALID 100925Z - 101000Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 578
   CONTINUES.
   
   ALTHOUGH AN ISOLATED STRONG-SEVERE TSTM REMAINS POSSIBLE ACROSS
   PARTS OF ERN NEB AND UPSTREAM INTO CENTRAL SD EARLY THIS MORNING...
   OVERALL SEVERE WEATHER THREAT WILL CONTINUE TO WANE...ALLOWING WW
   578 TO EXPIRE AS SCHEDULED AT 10Z.
   
   REGIONAL RADARS INDICATED A FEW TSTMS CONTINUED TO DEVELOP ALONG AN
   INSTABILITY AXIS WHICH EXTENDED FROM THE CENTRAL DAKOTAS SEWD ALONG
   THE MO RIVER VALLEY TO ERN KS...AND IN THE WAKE OF THE EARLIER MCS
   ACROSS ERN NEB/WRN IA.  RECENT RADAR TRENDS SHOWED LESS INTENSITY IN
   THESE TSTMS WHICH MAY BE DUE IN PART TO AN OVERALL DECREASE IN THE
   STRENGTH OF THE PLAINS SLY LLJ PER WIND PROFILER DATA AND AS
   SUPPORTED BY 06Z RUC/NAM.  ALTHOUGH EFFECTIVE BULK SHEAR OF 40-50 KT
   ALONG THE INSTABILITY AXIS MAY SUPPORT A FEW ADDITIONAL
   STRONG-SEVERE TSTMS YET THIS MORNING...OVERALL COVERAGE SUGGESTS A
   NEW WW IS NOT WARRANTED AT THIS TIME...AND CURRENT WW 578 WILL BE
   ALLOWED TO EXPIRE AT 10Z.
   
   ..PETERS.. 08/10/2007
   
   
   ATTN...WFO...FSD...OAX...ABR...LBF...
   
   45089959 43869820 42969745 42159632 41429642 41409727
   41899829 43109906 44850034