WATCHES: Severe Thunderstorm Watch Number 696

WWUS20 KWNS 071953
SEL6
SPC WW 071953
COZ000-UTZ000-WYZ000-080200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 696
NWS STORM PREDICTION CENTER NORMAN OK
155 PM MDT THU OCT 7 2010

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

LARGE PART OF WESTERN COLORADO
LARGE PART OF EASTERN UTAH
SMALL PART OF SOUTHERN WYOMING

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 155 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 105
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH
SOUTHEAST OF BULLFROG MARINA UTAH TO 35 MILES NORTHWEST OF
RAWLINS 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...A VIGOROUS S/WV TROUGH AND UPPER JET STREAK MOVING NEWD
INTO UT ATTM WHERE AIR MASS IS DESTABILIZING. STEEP LAPSE RATES
COUPLED WITH 50-60KT OF DEEP LAYER SHEAR AND MLCAPES TO AOA 500 J/KG
WILL BE SUFFICIENT FOR STORMS DEVELOPING INTO LINE SEGMENTS WITH
ASSOCIATED DAMAGING WIND THREAT AT AS THEY MOVE RAPIDLY NEWD.
PARAMETERS ALSO FAVOR POTENTIAL FOR ISOLATED SUPERCELLS WHICH WOULD
ENHANCE BOTH THE HAIL AND WIND THREAT.

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 450. MEAN STORM
MOTION VECTOR 23035.

...HALES

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