WATCHES: Severe Thunderstorm Watch Number 741

WWUS20 KWNS 141717
SEL1
SPC WW 141717
UTZ000-150000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 741
NWS STORM PREDICTION CENTER NORMAN OK
1120 AM MDT MON SEP 14 2009

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

MUCH OF UTAH

EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1120 AM UNTIL 600
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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH
NORTHWEST OF OGDEN UTAH TO 30 MILES EAST SOUTHEAST OF BRYCE
CANYON UTAH. 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.

DISCUSSION...STRONG/SEVERE THUNDERSTORMS DEVELOPING WRN UT AHEAD OF
UPPER TROUGH. WITH HEATING/STEEPENING LAPSE RATES AND MLCAPES
CLIMBING TO NEAR 1000 J/KG...STORMS WILL CONTINUE INCREASING IN
COVERAGE/INTENSITY THRU THE AFTERNOON AS THEY DEVELOP NEWD.
CLUSTERS AND SHORT LINE SEGMENTS WILL INCREASE THREAT OF DAMAGING
WINDS ALONG WITH THE LARGE HAIL CONCERN WITH ANY STRONG UPDRAFT.

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 22030.

...HALES

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