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Severe Thunderstorm Watch 507
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WW0507 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Low Very Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL7

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 507
   NWS STORM PREDICTION CENTER NORMAN OK
   310 AM MST SAT SEP 27 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     WESTERN AND NORTHERN ARIZONA
     SOUTHEASTERN NEVADA

   * EFFECTIVE THIS SATURDAY MORNING FROM 310 AM UNTIL 1100 AM MST.

   * PRIMARY THREATS INCLUDE...
     ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE
     A TORNADO OR TWO POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 100
   STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH OF
   PRESCOTT ARIZONA TO 40 MILES NORTH NORTHEAST OF CALIENTE NEVADA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU7).

   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...TSTMS EXPECTED TO INCREASE OVER WW AREA THROUGH LATER
   THIS MORNING AS LOW-LVL MOISTURE CONTINUES TO STREAM NWD IN ZONE OF
   STRENGTHENING LARGE-SCALE ASCENT AHEAD OF SLOWLY-PROGRESSIVE CNTRL
   CA UPR VORT. 50+ KT SSWLY DEEP SHEAR AND MOIST LOW-LVL ENVIRONMENT
   WILL COMPENSATE FOR MODEST MID-LVL LAPSE RATES TO SUPPORT A RISK FOR
   SUPERCELLS/SUSTAINED STORM CLUSTERS/LEWPS WITH A CONDITIONAL THREAT
   FOR DMGG WIND...MARGINALLY SVR HAIL..AND POSSIBLY A COUPLE
   TORNADOES. THE LATTER RISK SHOULD GREATEST OVER NW AZ...WHERE
   UPDRAFTS ARE LIKELY TO BE STRONGEST AND MOST DISCRETE/LONG-LIVED.
   SHOULD IT BECOME APPARENT THAT GREATER BUOYANCY WILL DEVELOP THAN IS
   NOW EXPECTED...AN UPGRADE TO A TORNADO WW MAY BE REQUIRED IN THAT
   AREA. IN ADDITION...PARTS OF SW UTAH MAY REQUIRE A SVR WW LATER THIS
   MORNING AS LOW-LVL DESTABILIZATION OCCURS IN WAKE OF MESOSCALE RAIN
   SYSTEM NOW CROSSING THE REGION.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
   A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION
   VECTOR 20035.


   ...CORFIDI
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Page last modified: September 27, 2014
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