SEL8
SPC WW 120005
NDZ000-SDZ000-WYZ000-120600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 768
NWS STORM PREDICTION CENTER NORMAN OK
605 PM MDT THU AUG 11 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHWEST NORTH DAKOTA
NORTHWEST SOUTH DAKOTA
NORTHEAST WYOMING
EFFECTIVE THIS THURSDAY NIGHT FROM 605 PM UNTIL MIDNIGHT MDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST OF
GILLETTE WYOMING TO 25 MILES SOUTH SOUTHEAST OF LEMMON SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 766...WW 767...
DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS OVER SOUTHEAST MT ARE
LIKELY TO PERSIST FOR SEVERAL MORE HOURS AND TRACK ACROSS WATCH
AREA. LOCALLY DAMAGING WINDS AND HAIL WILL BE THE MAIN THREAT.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28030.
...HART
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