WATCHES: Severe Thunderstorm Watch Number 511

WWUS20 KWNS 251929
SEL1
SPC WW 251929
COZ000-NEZ000-WYZ000-260200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 511
NWS STORM PREDICTION CENTER NORMAN OK
130 PM MDT THU JUN 25 2009

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

NORTH CENTRAL INTO NORTHEAST COLORADO
NEBRASKA PANHANDLE
SOUTHEAST WYOMING

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 130 PM UNTIL
800 PM 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF
TORRINGTON WYOMING TO 10 MILES SOUTHWEST OF LIMON 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 508...WW 509...WW 510...

DISCUSSION...STRONG TO SEVERE THUNDERSTORM DEVELOPMENT WILL CONTINUE
ALONG THE FRONT RANGE FROM CENTRAL CO INTO SERN WY...WITH STORMS
SHIFTING EWD INTO MODERATE INSTABILITY THROUGH THE EVENING. SHEAR
WILL BE SUFFICIENT FOR SUPERCELLS...ESPECIALLY WITH INITIAL STORMS
LATE TODAY. HOWEVER...EVOLUTION INTO CLUSTERS/LINES SHOULD OCCUR
WITH SEVERE THREAT PERSISTING OVER THE HIGH PLAINS INTO THE MID
EVENING. ALTHOUGH A BRIEF TORNADO MAY OCCUR...OVERALL THREATS
SHOULD BE FROM LARGE HAIL AND DAMAGING WINDS...ALONG WITH HEAVY
RAIN.

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 26015.

...EVANS

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