WATCHES: Severe Thunderstorm Watch Number 684

WWUS20 KWNS 222043
SEL4
SPC WW 222043
AZZ000-230300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 684
NWS STORM PREDICTION CENTER NORMAN OK
145 PM MST SAT SEP 22 2007

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

PARTS OF ARIZONA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 145 PM UNTIL
800 PM MST.

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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH
NORTHWEST OF FLAGSTAFF ARIZONA TO 80 MILES SOUTHEAST OF PHOENIX
ARIZONA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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...RAPID INCREASE IN THUNDERSTORMS ACROSS CENTRAL AZ IN
RESPONSE TO STRONG SLY FLOW OF MOIST/UNSTABLE AIR. WITH APPROACH OF
UPPER LOW SRN CA...STORMS EXPECTED TO CONTINUE INTENSIFYING AND
SPREAD NWD WITH LARGE HAIL AND BRIEF DAMAGING WINDS PRIMARY 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 500. MEAN STORM
MOTION VECTOR 19030.

..HALES

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