SEL0
SPC WW 041901
AZZ000-CAZ000-NVZ000-UTZ000-050200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 690
NWS STORM PREDICTION CENTER NORMAN OK
105 PM MDT MON OCT 4 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PART OF NORTHWEST ARIZONA
PARTS OF SOUTHEAST CALIFORNIA
PARTS OF SOUTHERN NEVADA
SMALL PART OF SOUTHWEST UTAH
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 105 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 115
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF
CEDAR CITY UTAH TO 65 MILES SOUTHWEST OF NEEDLES CALIFORNIA. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).
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...THUNDERSTORMS ARE INCREASING IN NUMBER AND INTENSITY
ACROSS THE WATCH AREA IN ADVANCE OF DEEPENING UPPER TROUGH OVER CA.
GIVEN THE STEEP LAPSE RATES AND MLCAPES TO 1000 J/KG...SEVERE
THUNDERSTORMS WILL BE A POSSIBILITY THROUGH THE AFTERNOON. PRIMARY
THREAT WILL BE LARGE HAIL AND BRIEF DAMAGING WINDS.
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 22025.
...HALES
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