WATCHES: Severe Thunderstorm Watch Number 732

WWUS20 KWNS 232215
SEL2
SPC WW 232215
AZZ000-CAZ000-NVZ000-240600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 732
NWS STORM PREDICTION CENTER NORMAN OK
410 PM MDT SUN AUG 23 2009

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

WESTERN ARIZONA
SOUTHEASTERN CALIFORNIA
SOUTHERN NEVADA

EFFECTIVE THIS SUNDAY AFTERNOON FROM 410 PM UNTIL MIDNIGHT MDT.

HAIL TO 1.5 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES WEST
NORTHWEST OF SAINT GEORGE UTAH TO 10 MILES SOUTHEAST OF BLYTHE
CALIFORNIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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...SCTD TSTMS EXPECTED TO CONTINUE FORMING THROUGH THIS
EVE IN ZONE OF HIGH PW DOWNSTREAM FROM TWO-PART UPR IMPULSE NOW
EXTENDING FROM SRN CA SWD INTO NRN BAJA. MODERATE UNIDIRECTIONAL
CLOUD LAYER FLOW WITH STEEP MID LVL LAPSE RATES AND FAIRLY RICH
MOISTURE SUPPLY SUGGESTS POTENTIAL FOR REGENERATIVE/SUSTAINED STORMS
AND POSSIBLY A SUPERCELL OR TWO THAT COULD YIELD SVR HAIL/WIND. THE
CONVECTION COULD ORGANIZE INTO SMALL CLUSTERS/BANDS BY MID EVE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 23020.

...CORFIDI

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