

000 

WWUS20 KWNS 142345

SEL2

SPC WW 142345

AZZ000-150600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 832

NWS STORM PREDICTION CENTER NORMAN OK

445 PM MST THU AUG 14 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND WESTERN ARIZONA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 445 PM UNTIL

1100 PM MST.



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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 75 MILES EAST OF

PHOENIX ARIZONA TO 145 MILES WEST NORTHWEST OF PHOENIX ARIZONA.

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.



OTHER WATCH INFORMATION...CONTINUE...WW 828...WW 829...WW

830...WW 831...



DISCUSSION...THUNDERSTORMS ARE DEVELOPING FROM THE HIGHER TERRAIN

SWWD INTO THE LOWER DESERTS VALLEYS WHERE A MODERATELY UNSTABLE

AIRMASS IS AVAILABLE.  STEEP LOW LEVEL LAPSE RATES WILL ENHANCE

FORMATION OF COLD POOLS AND ASSOCIATED DAMAGING WINDS AS STORMS

PROPAGATE INTO LOWER ELEVATIONS.



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 05025.





...HALES

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