High Wind Watch 4, NWS Los Angeles, CA

SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
300 AM PDT THU SEP 21 2006

.SHORT TERM...HAVE ISSUED A HIGH WIND WATCH FOR THE MOUNTAINS OF
VENTURA AND LOS ANGELES COUNTIES AS WELL AS FOR THE ADJACENT COASTAL
VALLEYS AND SANTA MONICA RANGE. HAVE INCLUDED THE VALLEYS TO ACCOUNT
FOR LOCALLY STRONG WINDS EXPANDING OUT BEYOND THE ADJACENT MOUNTAINS
IN THE VICINITY OF CANYONS. GUIDANCE WAS CONSISTENT WITH THE
RELATIVELY DRY FRONTAL SYSTEM OVER NORTHERN CALIFORNIA EARLY THIS
MORNING DIVING SOUTH AND MOVING OVER THE AREA IN THE EVENING.
NORTHWEST WINDS WILL INCREASE OVER THE NORTHWEST HALF OF THE AREA
TONIGHT AS THE FRONT ACCELERATES OVER THE AREA AND LOW CLOUDS WILL
DEVELOP OVER THE OCEAN SIDE OF THE COASTAL AND TRANVERSE RANGES.
HIGH PRESSURE WILL GRADUALLY WEAKEN AND SHIFT EAST THROUGH THE
WEEKEND. THE STRONG SANTA ANA WINDS WILL REDEVELOP SAT AND SUN NIGHT
THOUGH STRENGTH WILL WANE EACH NIGHT. WILL CONTINUE WITH SIGNIFICANT
COOLING FRI WITH TEMPERATURES 10 TO 15 DEGREES BELOW SEASONAL
NORMAL. TEMPERATURES WILL MODERATE THROUGH THE PERIOD THOUGH WILL
REMAIN SEVERAL DEGREES BELOW NORMAL.

.LONG TERM...MADE NO CHANGES THROUGH THE PERIOD. GUIDANCE DIFFERED
FROM PREVIOUS RUN AND THE LONG WAVE RIDGE IS EXPECTED TO REMAIN
UPSTREAM CENTERED OVER THE EASTERN PACIFIC. TEMPERATURES WILL
CONTINUE TO MODERATE AND WARM A DEGREE OR TWO THROUGH THE PERIOD
THOUGH REMAIN BELOW SEASONAL NORMAL.

&&

.AVIATION...EXCEPT FOR AREAS OF SMOKE ACROSS PORTIONS OF LA/VTU
COUNTIES THIS MORNING...SKIES REMAIN CLEAR FROM STRATUS THIS
MORNING. LAX-DAG PRES GRADIENTS ARE TRENDING SHARPLY OFFSHORE THIS
MORNING. THIS IS KEEPING THE MAJORITY OF STRATUS OFF THE COAST.
HOWEVER...SATELLITE IMAGERY DOES INDICATE SOME PATCHY LOW CLOUDS
TRYING TO DEVELOP ALONG THE IMMEDIATE COAST OF LA/VTU AND SBA
COUNTIES...BUT SEEMS TO DETERIORATE AS SOON AS IT FORMS.
ALSO...LOCAL PATCHY FOG COULD DEVELOP NEAR KSMX BEFORE SUNRISE AS
WELL WITH LIFR CIGS AND VSBYS...BUT BURNOFF BY 16Z. LAX PROFILERS
SHOWS INVERSION BEGINS ABOVE 1100 FT...SO PATCHY LOW CLOUDS WITH IFR
CIGS COULD OCCUR ALONG THE IMMEDIATE COAST OF LA/VTU SBA COASTAL
AREAS EARLY THIS MORNING BUT SHOULD BE SHORT LIVED. EXPECT MOSTLY
VFR CONDITIONS TODAY FOR ALL AIRFIELDS TODAY AFTER 17Z.

KLAX...VFR CONDITIONS SHOULD PREVAIL THROUGH TODAY WITH VARIABLE
WINDS 6 KT OR LESS...BECOMING W BY 17Z UP TO 13 KT THIS AFTERNOON
AND EVENING. MODELS DO SUGGEST A DECENT EDDY DEVELOPING OVERNIGHT
WHICH WILL BRING LOW CLOUDS AND A DECENT EASTERLY COMPONENT AFTER 9Z
WITH WIND SPEEDS UP TO 10 KT. WIND DIRECTION SHOULD BECOME SW BY 20Z
ON FRI.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
FIRE WEATHER WATCH (SEE LAXRFWLOX).
SMALL CRAFT ADVISORY (SEE LAXCWFLOX).
HIGH RIP CURRENT RISK (SEE LAXSRFLOX).
HIGH WIND WATCH (SEE LAXNPWLOX).

&&

PUBLIC...FORWOOD
AVIATION...KAPLAN

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