WATCHES: Severe Thunderstorm Watch Number 571

WWUS20 KWNS 112156
SEL1
SPC WW 112156
COZ000-KSZ000-NEZ000-WYZ000-120500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 571
NWS STORM PREDICTION CENTER NORMAN OK
455 PM CDT SAT JUL 11 2009

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

NORTHEAST COLORADO
NORTHWEST KANSAS
WESTERN NEBRASKA PANHANDLE
SOUTHEAST WYOMING

EFFECTIVE THIS SATURDAY AFTERNOON FROM 455 PM UNTIL MIDNIGHT CDT.

HAIL TO 2.5 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF
TORRINGTON WYOMING TO 50 MILES SOUTHWEST OF BURLINGTON COLORADO.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 570...

DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE TO
INTENSIFY OVER THE FOOTHILLS OF CENTRAL CO AND SOUTHEAST WY...AND
SPREAD EASTWARD INTO THE PLAINS THIS EVENING. EFFECTIVE SHEAR
VALUES ARE SUFFICIENT FOR SUPERCELLS...WHILE DEWPOINTS IN THE 60S
AND STRONG HEATING ARE YIELDING MLCAPE VALUES OF 2000-3000 J/KG.
LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE IN STRONGER STORMS
THROUGH THE EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 30025.

...HART

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