WATCHES: Severe Thunderstorm Watch Number 643

WWUS20 KWNS 142043
SEL3
SPC WW 142043
COZ000-KSZ000-NEZ000-WYZ000-150300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 643
NWS STORM PREDICTION CENTER NORMAN OK
240 PM MDT THU JUL 14 2011

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

NORTHEASTERN COLORADO
NORTHWESTERN KANSAS
WESTERN NEBRASKA
SOUTHEASTERN WYOMING

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
900 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 95
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES EAST
NORTHEAST OF SCOTTSBLUFF NEBRASKA TO 20 MILES SOUTHEAST OF LIMON
COLORADO. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 642...

DISCUSSION...VERY MOIST BOUNDARY LAYER CONDITIONS AND ADDITIONAL
HEATING WILL BE FAVORABLE FOR THUNDERSTORMS OVER NERN CO/SERN WY
HIGHER TERRAIN TO PROGRESS NEWD INTO THE PLAINS THROUGH THE EVENING
HOURS. DEEP LAYER SHEAR IS FAVORABLE FOR MULTICELL STORMS WITH
SEVERE HAIL. THE WIND DAMAGE THREAT MAY INCREASE LATER THIS EVENING
ACROSS THE EASTERN PORTIONS OF THE WATCH AS STRENGTHENING LOW LEVEL
JET MAY RESULT IN STORMS CONGEALING INTO A LINEAR MCS.

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 550. MEAN STORM
MOTION VECTOR 23020.

...IMY

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