

872 

WWUS20 KWNS 182005

SEL7

SPC WW 182005

AZZ000-CAZ000-NVZ000-UTZ000-190400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 437

NWS STORM PREDICTION CENTER NORMAN OK

105 PM PDT SAT JUL 18 2015



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  FAR WESTERN ARIZONA

  FAR SOUTHEASTERN CALIFORNIA

  SOUTHEASTERN NEVADA

  SOUTHWESTERN UTAH



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 105 PM UNTIL

  900 PM PDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



SUMMARY...THUNDERSTORMS NOW FORMING OVER SE CA AND SRN NV EXPECTED

TO MERGE INTO ROUGHLY N-S BANDS...SOME OF WHICH WILL POSE A RISK FOR

DAMAGING WIND AND MARGINALLY SEVERE HAIL. MORE ISOLATED STORMS WITH

A WIND/HAIL THREAT MAY AFFECT NW AZ AND SW UT.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES EAST

SOUTHEAST OF IMPERIAL CALIFORNIA TO 60 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 436...



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 550. MEAN STORM MOTION

VECTOR 22025.





...CORFIDI

