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 -SWC-
Posted on: Tue, 09 Jul 2013 22:54:43 +0000
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