Wind Advisory 22, NWS San Diego, CA

000 
WWUS76 KSGX 011858
NPWSGX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
1158 AM PDT THU OCT 1 2009

...THE WIND ADVISORY WILL EXPIRE AT NOON...

.GUSTY OFFSHORE WINDS WILL SLOWLY WEAKEN THROUGH THE AFTERNOON.

CAZ042-048-050-012000-
/O.EXP.KSGX.WI.Y.0022.000000T0000Z-091001T1900Z/
ORANGE COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-
1158 AM PDT THU OCT 1 2009

...WIND ADVISORY WILL EXPIRE AT NOON PDT TODAY...

THE WIND ADVISORY WILL EXPIRE AT NOON PDT TODAY. 

GUSTY OFFSHORE FLOW WILL CONTINUE ACROSS THE INLAND VALLEYS AND
THE INLAND ORANGE COUNTY COASTAL PLAIN THIS AFTERNOON...BUT WIND
GUSTS ARE EXPECTED TO REMAIN BELOW 35 MPH.

$$

SCV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 PM PDT WED SEP 30 2009

.SYNOPSIS...A TROUGH OF LOW PRESSURE WILL MOVE OUT OF CALIFORNIA
TODAY AND STRONG WINDS IN THE MOUNTAINS AND DESERTS WILL DECREASE.
THE FLOW WILL TURN OFFSHORE AND CLEAR THE SKIES. THURSDAY WILL BE
WARMER AND VERY DRY ESPECIALLY WEST OF THE MOUNTAINS AND GUSTY
OFFSHORE WINDS ARE EXPECTED THROUGH THE MOUNTAIN PASSES. ANOTHER
DEEP LOW PRESSURE TROUGH WILL SETTLE OVER THE REGION OVER THE
WEEKEND AND NEXT WEEK...BRINGING MUCH COOLER WEATHER AND GUSTY WINDS
TO THE MOUNTAINS AND DESERTS. THERE IS ALSO A SLIGHT CHANCE OF
SHOWERS SUNDAY...MAINLY ALONG THE FOOTHILLS AND COASTAL SLOPES.

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

CLEAR AND MILD THIS AFTERNOON ACROSS THE FORECAST AREA. SURFACE
HIGH PRESSURE HAS BEGUN TO MOVE INTO THE GREAT BASIN AND LOCAL
SURFACE PRESSURE GRADIENTS ARE NOW OFFSHORE TO THE NORTH WITH ABOUT
-1 MB SAN-DAG. SOME STATIONS IN SAN BERNARDINO COUNTY VALLEYS AND
MOUNTAINS ARE ALREADY REPORTING LOW RH AND NORTH WINDS WITH GUSTS
BETWEEN 15-20 MPH. FURTHER SOUTH...ONSHORE PRESSURE GRADIENTS
CONTINUE WITH ABOUT 4 MB SAN-IPL.

MUCH WARMER WEST OF THE MOUNTAINS THURSDAY AS THE OFFSHORE FLOW
STRENGTHENS. THE PRESSURE GRADIENTS PEAK THURSDAY MORNING WITH ABOUT
-4 TO -5 MB ACROSS THE MOUNTAINS. AT THE SAME TIME...850 MB TEMP
GRADIENTS PEAK AT ABOUT 4C TO 5C. NOT MUCH UPPER LEVEL SUPPORT WITH
THIS EVENT SO THE WINDS WILL MAINLY BE GRADIENT DRIVEN. THE 12Z NAM
INDICATES 925 MB WINDS INCREASING TO ABOUT 25 KNOTS BELOW THE CAJON
PASS AND ACROSS THE WESTERN INLAND EMPIRE BY 09Z...THEN BELOW THE
PASSES AND CANYONS OF SAN DIEGO COUNTY BY 12Z. CURRENT FORECAST
CALLS FOR SUSTAINED WINDS OF 15-25 MPH WITH LOCAL GUSTS IN EXCESS OF
40 MPH IN THE USUAL LOCATIONS. RH WILL DROP INTO THE SINGLE DIGITS
IN MANY LOCATIONS AND TEMPS WILL JUMP UP INTO THE MID 80S AND LOW
90S WEST OF THE MOUNTAINS. THE COMBINATION OF GUSTY WINDS AND LOW
HUMIDITY WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS.

THE OFFSHORE FLOW WILL BE SHORT LIVED AS ONSHORE FLOW REDEVELOPS
OVER THE AREA BY FRIDAY AFTERNOON. THIS WILL BRING COOLING TO THE
COASTAL AREAS...BUT IT WILL REMAIN WARM AND VERY DRY INLAND. LOW
CLOUDS AND FOG SHOULD RETURN TO THE COAST FRIDAY NIGHT.

A DEEP LOW PRESSURE SYSTEM WILL DEVELOP OVER THE PAC N.W. EARLY
SATURDAY AND THEN DROP SOUTHWARD INTO THE WESTERN U.S. THROUGH
MONDAY. THIS WILL BRING A SIGNIFICANT COOLING TREND...GUSTY ONSHORE
WINDS IN THE MOUNTAINS AND DESERTS...AND A MUCH DEEPER MARINE LAYER.
TEMPS ON SATURDAY WILL BE ABOUT 5 DEGREES BELOW NORMAL...AND WINDS
WILL INCREASE IN THE MOUNTAINS AND DESERTS AS THE PRESSURE GRADIENT
TIGHTENS AND MID-UPPER LEVEL WINDS STRENGTHEN. MARINE LAYER CLOUDS
ARE EXPECTED TO SPREAD ALL THE WAY UP ONTO THE COASTAL MOUNTAINS
SLOPES BY LATE SATURDAY NIGHT OR EARLY SUNDAY MORNING. THERE IS A
SLIGHT CHANCE OF LIGHT SHOWERS BY SUNDAY...MAINLY NEAR THE FOOTHILLS
AND ON THE COASTAL SLOPES. SUNDAY AND MONDAY WILL BE THE COOLEST
DAYS WITH INLAND TEMPERATURES ABOUT 15 DEGREES BELOW SEASONAL
AVERAGES. HIGHS WILL BE MAINLY IN THE 60S WEST OF THE MOUNTAINS WITH
LOW 70S POSSIBLE IN THE WARMEST INLAND VALLEYS. THE MOUNTAINS WILL
BE QUITE COOL...ESPECIALLY ON THE MID COASTAL SLOPES NEAR THE BASE
OF THE MARINE INVERSION.

A POSITIVE TILT TROUGH LINGERS OVER THE WESTERN U.S. THROUGH THE
MIDDLE OF NEXT WEEK. TEMPERATURE SHOULD REMAIN SOMEWHAT BELOW
SEASONAL AVERAGES. PATCHY LOW CLOUDS AND FOG WILL CONTINUE WEST OF
THE MOUNTAINS.

&&

.AVIATION...
301915Z...MARINE LAYER DEPTH THIS AFTERNOON WAS AROUND 3000 FEET AND
SHOULD LOWER SIGNIFICANTLY OVERNIGHT TO LESS THAN 500 FEET BY
SUNRISE. MARINE LAYER REMAINS DISRUPTED AND NOT LIKELY TO HAVE ANY
MORE THAN SCATTERED STRATOCU OVERNIGHT WHICH SHOULD DISSIPATE BEFORE
SUNRISE.

ABOVE THE MARINE LAYER...A MOSTLY CLEAR SKY WITH UNRESTRICTED
VISIBILITIES WILL CONTINUE THROUGH THURSDAY.

OFFSHORE FLOW WILL BRING LOCAL GUSTY NORTHEAST WINDS THROUGH AND
BELOW MOUNTAIN PASSES AND CANYONS WITH ASSOCIATED UP AND DOWN DRAFTS
AND LOW LEVEL WIND SHEAR...ESPECIALLY VICINITY OF KONT LATE TONIGHT
AND THURSDAY.

ALSO...OFFSHORE FLOW ON THURSDAY COULD RESULT IN MAXIMUM TEMPS AT
KSNA ANYWHERE BETWEEN 32C AND 35C AND NEAR 30C AT KSAN.  HORTON

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

FIRE WEATHER WATCH FOR TONIGHT THROUGH THURSDAY AFTERNOON...SEE
LAXRFWSGX.

&&

PUBLIC...SCV
AVIATION...HORTON
FIRE WEATHER...BALFOUR

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
815 PM PDT WED SEP 30 2009

CAZ042-043-048-050-055-056-057-058-060-061-062-011200-
ORANGE COUNTY COASTAL AREAS-
SAN DIEGO COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-
SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-
SANTA ANA MOUNTAINS AND FOOTHILLS-
SAN DIEGO COUNTY MOUNTAINS-
APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-
SAN DIEGO COUNTY DESERTS-
815 PM PDT WED SEP 30 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR
ALL OF EXTREME SOUTHWESTERN CALIFORNIA.

.DAY ONE...REST OF TONIGHT

RED FLAG WARNING IN EFFECT FOR WINDS GUSTING TO 35 MPH
OR HIGHER AND RELATIVE HUMIDITY AT OR BELOW 15 PERCENT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

RED FLAG WARNING IN EFFECT TO 6 PM PDT THURSDAY FOR
WINDS GUSTING TO 35 MPH OR HIGHER AND RELATIVE HUMIDITY
AT OR BELOW 15 PERCENT.

STRONG ONSHORE WINDS ARE EXPECTED SATURDAY AND SUNDAY.

.SPOTTER INFORMATION STATEMENT...
SKYWARN WEATHER ACTIVATION IS NOT REQUESTED FOR THIS AREA...
HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT
WEATHER CONDITIONS.

MACKECHNIE