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WWUS20 KWNS 092254

SEL4

SPC WW 092254

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 404

NWS STORM PREDICTION CENTER NORMAN OK

350 PM MST TUE JUL 9 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  PARTS OF SOUTHERN ARIZONA



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 350 PM UNTIL

  1000 PM MST.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90

STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES NORTHEAST OF

PHOENIX ARIZONA TO 65 MILES WEST SOUTHWEST OF TUCSON ARIZONA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 CONTINUE TO DEVELOP/MOVE SWWD OFF THE

MOGOLLON RIM THROUGH GILA/NORTHEAST GRAHAM COUNTIES ATTM...WITH

CONTINUED SWWD MOTION OFF THE HIGHER TERRAIN AND INTO THE LOWER

DESERTS -- INCLUDING THE TUCSON METRO AREA -- EXPECTED THROUGH THE

EVENING GIVEN THE BACKGROUND WIND FIELD SUPPORTIVE OF SUCH.  WITH A

PARTICULARLY MOIST/UNSTABLE ENVIRONMENT IN PLACE ACROSS THE

AREA...EXPECT CONVECTION TO INCREASE IN COVERAGE WITH TIME AS STORMS

MOVE OFF THE RIM -- ACCOMPANIED BY THE LIKELIHOOD FOR DAMAGING WIND

GUSTS THROUGH THE EVENING HOURS.



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 550. MEAN STORM

MOTION VECTOR 04540.





...GOSS

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