Wednesday, September 5, 2007

WATCHES: Severe Thunderstorm Watch Number 666

WWUS20 KWNS 051852
SEL6
SPC WW 051852
COZ000-UTZ000-WYZ000-060300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 666
NWS STORM PREDICTION CENTER NORMAN OK
1250 PM MDT WED SEP 5 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

NORTHWEST COLORADO
CENTRAL AND NORTHEAST UTAH
SOUTHWEST WYOMING

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
900 PM MDT.

HAIL TO 1.5 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 105
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTHWEST OF
GREEN RIVER UTAH TO 25 MILES NORTHWEST OF LANDER WYOMING. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

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.

DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY THIS
AFTERNOON ALONG AND AHEAD OF COLD FRONT FROM CENTRAL UT INTO WESTERN
WY...MOVING INTO WESTERN CO THIS EVENING. STRONG WINDS
ALOFT...POCKETS OF DAYTIME HEATING...AND MODERATE INSTABILITY WILL
PROMOTE A RISK OF ORGANIZED STORMS CAPABLE OF DAMAGING WINDS AND
HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
MOTION VECTOR 24035.


..HART

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