WATCHES: Severe Thunderstorm Watch Number 445

WWUS20 KWNS 061951
SEL5
SPC WW 061951
COZ000-NEZ000-WYZ000-070300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 445
NWS STORM PREDICTION CENTER NORMAN OK
250 PM CDT TUE JUL 6 2010

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

PARTS OF NORTHEAST COLORADO
LARGE PART OF WESTERN AND NORTHERN NEBRASKA
PARTS OF SOUTHEAST WYOMING

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
1000 PM CDT.

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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTHWEST
OF CHEYENNE WYOMING TO 20 MILES NORTH OF ONEILL NEBRASKA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

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 444...

DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG FRONTAL BOUNDARY
THAT EXTENDS FROM CHERRY COUNTY TO CYS. IN ADDITION STORMS WILL
DEVELOP EWD OFF THE HIGHER TERRAIN OF NERN CO/SERN WY. WITH MLCAPES
AOA 1000 J/KG...STEEP LAPSE RATES AND 30-35 KT OF SHEAR...SEVERE
STORMS ARE LIKELY...INCLUDING LARGE HAIL AND DAMAGING DOWNBURST
WINDS. ISOLATED SUPERCELLS ARE ALSO POSSIBLE INCREASING BOTH HAIL
AND WIND THREAT AS WELL AS POSSIBLE BRIEF TORNADO'S/LAND SPOUTS.

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 27020.

...HALES

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