

000 

WWUS20 KWNS 272057

SEL3

SPC WW 272057

CAZ000-CWZ000-280200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 23

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM PST SUN JAN 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN AND CENTRAL CALIFORNIA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL

600 PM PST.



HAIL TO 1 INCH 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 70

STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES NORTHWEST OF

FRESNO CALIFORNIA TO 20 MILES SOUTHEAST OF OXNARD CALIFORNIA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...CONVECTION IS DEEPENING ATTM ALONG SEVERAL CONFLUENCE

BANDS AHEAD OF VORT LOBE EJECTING NNE TOWARD THE CNTRL CA CST.  THE

CONVECTION LIKELY WILL INTENSIFY INTO TSTMS THROUGH THE REMAINDER OF

THE DAY AS SFC HEATING AND ASCENT FURTHER DESTABILIZE REGION.  GIVEN

EXISTING WIND FIELD /REF PREVIOUS CONVECTIVE OUTLOOKS/...POTENTIAL

WILL EXIST FOR SHORT LINE SEGMENTS AND EVEN A FEW DISCRETE STORMS

THAT COULD YIELD HAIL AND LOCALLY DAMAGING WIND.

TOPOGRAPHICALLY-INDUCED BACKING OF THE NEAR-SFC FLOW ALONG THE SANTA

BARBARA-OXNARD CORRIDOR ...AND INVOF LINE BREAKS IN THE CNTRL

VLY...MAY ALSO SPAWN A TORNADO OR TWO BEFORE ACTIVITY WEAKENS WITH

NIGHTFALL.



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 350. MEAN STORM MOTION

VECTOR 22040.





...CORFIDI

