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WWUS20 KWNS 082012

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AZZ000-NVZ000-UTZ000-090300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 588

NWS STORM PREDICTION CENTER NORMAN OK

215 PM MDT SUN AUG 8 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHWEST ARIZONA

       PARTS OF SOUTHERN NEVADA

       SOUTHWEST UTAH



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 215 PM UNTIL 900

PM 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST

SOUTHWEST OF KINGMAN ARIZONA TO 30 MILES NORTH NORTHEAST OF DELTA

UTAH.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 587...



DISCUSSION...UNSEASONABLY STRONG UPPER TROUGH ROTATING NEWD ACROSS

SRN NV/WRN UT WITH A MOIST AND INCREASINGLY UNSTABLE AIR MASS ACROSS

THE WATCH AREA.  THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND

INTENSITY OFF THE HIGHER TERRAIN WITH A FEW SEVERE STORMS

DEVELOPING.  PRIMARY THREAT WILL BE DAMAGING WINDS AND LARGE HAIL.

WITH 40 KT OF SHEAR COUPLED WITH VEERING LOW LEVEL WIND

PROFILES...POTENTIAL FOR SUPERCELLS AND AN ENHANCED WIND AND HAIL

THREAT.



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 22025.





...HALES

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