WATCHES: Severe Thunderstorm Watch Number 466

WWUS20 KWNS 040026
SEL6
SPC WW 040026
NDZ000-SDZ000-WYZ000-040800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 466
NWS STORM PREDICTION CENTER NORMAN OK
625 PM MDT SAT AUG 3 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHWEST NORTH DAKOTA
WESTERN SOUTH DAKOTA
NORTHEAST WYOMING

* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 625 PM
UNTIL 200 AM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 110
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH
NORTHWEST OF GILLETTE WYOMING TO 60 MILES EAST OF BUFFALO SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 463...WW 464...WW 465...

DISCUSSION...WITHIN AN ENVIRONMENT CHARACTERIZED BY MODERATE
INSTABILITY/RELATIVELY STRONG VERTICAL SHEAR...WIDELY SCATTERED
TSTMS WILL CONTINUE TO SPREAD GENERALLY EASTWARD ACROSS NORTHEAST WY
INTO WESTERN SD...WITH A FEW SUPERCELLS/MORE LIKELY MCS DEVELOPMENT
EXPECTED TO OCCUR FROM EASTERN MT INTO PARTS OF THE WESTERN DAKOTAS
INTO THE OVERNIGHT. DAMAGING WINDS AND SEVERE HAIL ARE THE PRIMARY
HAZARDS.

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 450. MEAN STORM
MOTION VECTOR 27035.


...GUYER

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