WATCHES: Severe Thunderstorm Watch Number 517

WWUS20 KWNS 090049
SEL7
SPC WW 090049
MTZ000-NDZ000-SDZ000-WYZ000-090700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 517
NWS STORM PREDICTION CENTER NORMAN OK
645 PM MDT SUN SEP 8 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEASTERN MONTANA
SOUTHWESTERN NORTH DAKOTA
NORTHWESTERN SOUTH DAKOTA
NORTHEASTERN WYOMING

* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 645 PM
UNTIL 100 AM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75
MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 3
INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES SOUTH OF
RAPID CITY SOUTH DAKOTA TO 30 MILES EAST NORTHEAST OF BAKER
MONTANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 516...

DISCUSSION...BKN BAND OF TSTMS MOVING NEWD OVER NERN WY AND EXTREME
SERN MT IS BECOMING BETTER ORGANIZED WHILE MOVING INTO FAVORABLY
MOIST AND AT LEAST MARGINALLY BUOYANT BOUNDARY LAYER...INDICATING
THAT INITIALLY ISOLATED SVR THREAT MAY INCREASE IN DENSITY. EXPECT
CONTINUING POTENTIAL FOR SVR HAIL...SUCH AS HAS BEEN OBSERVED WITH
CELL NEAR I-90 IN NERN WY...AND INCREASING WIND THREAT. BARELY
SUB-SVR/48-KT GUST HAS BEEN MEASURED WITH APPARENTLY LESS-ORGANIZED
PORTION OF LINE S OF WW AREA -- AT TOR -- WITHIN PAST HALF HOUR.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 26030.


...EDWARDS

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