MESOSCALE DISCUSSION 1174
   NWS STORM PREDICTION CENTER NORMAN OK
   0502 AM CDT SUN JUN 17 2007
   
   AREAS AFFECTED...PARTS OF ERN MT...WRN ND
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 403...404...
   
   VALID 171002Z - 171100Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   403...404...CONTINUES.
   
   A NEW WW REPLACING WWS 403 AND 404 MAY BE ISSUED BY 11Z.
   
   FORCING IN EXIT REGION OF 60-70 KT CYCLONIC 500 MB JET STREAK NOSING
   INTO THE NORTHERN ROCKIES WILL CONTINUE TO GRADUALLY SHIFT EASTWARD
   ACROSS THE NORTHERN HIGH PLAINS THROUGH MID MORNING.  AS ASSOCIATED
   SURFACE LOW DEVELOPS NORTHEASTWARD OUT OF SOUTHEAST
   MONTANA...UPSLOPE COMPONENT TO BOUNDARY LAYER FLOW ACROSS EASTERN
   MONTANA WILL PROBABLY WEAKEN.  AND...UNCERTAINTY EXISTS CONCERNING
   THE LONGEVITY OF SCATTERED VIGOROUS ONGOING STORMS.  BUT...DEEP
   LAYER SHEAR WILL REMAIN STRONG AND SUPPORTIVE OF SUPERCELL POTENTIAL
   WITH RISK FOR LARGE HAIL/DAMAGING WIND GUSTS INTO THE EASTERN
   MONTANA/NORTH DAKOTA BORDER AREA BY 15Z.
   
   ..KERR.. 06/17/2007
   
   
   ATTN...WFO...BIS...BYZ...GGW...
   
   45850754 46300660 47280556 48150511 48510436 48650300
   47470275 46260398 45340538 45330666