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409 

WWUS20 KWNS 101843

SEL6

SPC WW 101843

AZZ000-110200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 896

NWS STORM PREDICTION CENTER NORMAN OK

1145 AM MST WED SEP 10 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF WESTERN ARIZONA



EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1145 AM UNTIL

700 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTHWEST OF

FLAGSTAFF ARIZONA TO 55 MILES SOUTHWEST OF GILA BEND ARIZONA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...LOW LEVEL MOISTURE CONTINUES TO FEED NEWD INTO AZ AHEAD

OF CA UPPER TROUGH.  WITH 30-35 KT OF DEEP LAYER SHEAR AND MLCAPES

AOA 1500 J/KG THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY

ACROSS WRN AZ.  SHEAR IS SUFFICIENT FOR DEVELOPMENT OF SUPERCELLS

WHICH WILL ENHANCE PRIMARILY HAIL AND DAMAGING WIND POTENTIAL.



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 23020.





...HALES

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