338
FXUS66 KSGX 161119
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
420 AM PDT WED OCT 16 2013
.SYNOPSIS...
UPPER LEVEL HIGH PRESSURE OFF THE WEST COAST WILL MAINTAIN DRY
NORTHWEST FLOW OVER CALIFORNIA THROUGH EARLY NEXT WEEK. GUSTY
NORTHEAST WINDS WILL CONTINUE NEAR THE COASTAL FOOTHILLS AND FAVORED
PASSES AND CANYONS THROUGH THIS MORNING WITH ANOTHER ROUND OF GUSTY
NORTHEAST WINDS FRIDAY. MINOR COOLING FOR THURSDAY FOLLOWED BY NEAR
SEASONAL TEMPERATURES AND FAIR WEATHER.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
.SHORT TERM (TODAY THROUGH FRIDAY)...
SURFACE HIGH PRESSURE OVER THE GREAT BASIN IS BRINGING LOCALLY GUSTY
NORTHEAST TO EAST WINDS NEAR THE COASTAL FOOTHILLS EARLY THIS
MORNING. WINDS HAVE NOT BEEN OVERLY STRONG WITH MOST GUSTS 40 MPH OR
LESS WITH THE STRONGEST OF 47 MPH AT SILL HILL IN THE SAN DIEGO
COUNTY MOUNTAINS WEST OF CUYAMACA PEAK. WHERE MIXING FROM THE WINDS
IN THE VALLEYS AND INLAND COASTAL AREAS IS OCCURRING...TEMPERATURES
ARE IN THE 60S AND LOWER 70S. GUSTY WINDS WILL CONTINUE THROUGH THIS
MORNING...THEN DECREASE THIS AFTERNOON. PATCHY STRATUS NEAR PORTIONS
OF THE SAN DIEGO COUNTY COAST TUESDAY EVENING HAS MOSTLY DISSIPATED
WITH SATELLITE IMAGERY STILL SHOWING SOME PATCHY STRATUS OFF THE
NORTHERN BAJA COAST. THE OFFSHORE FLOW AND LESSENED MARINE INFLUENCE
WILL PUSH WARMER HIGH TEMPERATURES TOWARD THE COAST TODAY WITH
GREATEST COASTAL WARMING IN SOUTHERN SAN DIEGO COUNTY.
ANOTHER WEAK TROUGH OF LOW PRESSURE MOVING SOUTHWARD THROUGH THE
GREAT BASIN THURSDAY WILL BRING WEAKER WINDS TO SOUTHWEST
CALIFORNIA. PATCHY STRATUS MAY RETURN NEAR THE COAST LATE TONIGHT
INTO THURSDAY MORNING WITH COOLING WEST OF THE MOUNTAINS THURSDAY.
AS THE GREAT BASIN UPPER TROUGH OF LOW PRESSURE MOVES INTO THE
SOUTHERN ROCKIES FRIDAY AND SURFACE HIGH PRESSURE DEVELOPS OVER THE
GREAT BASIN...GUSTY NORTHEAST WINDS WILL ONCE AGAIN DEVELOP NEAR THE
COASTAL FOOTHILLS FRIDAY MORNING. COASTAL STRATUS MAY PRECEDE THE
DEVELOPING OFFSHORE FLOW LATE THURSDAY NIGHT THROUGH EARLY FRIDAY.
&&
.LONG TERM (SATURDAY THROUGH TUESDAY)...
HIGH PRESSURE OFF THE WEST COAST WILL MAINTAIN A WEAK NORTHWEST FLOW
PATTERN ALOFT ACROSS SOUTHERN CALIFORNIA WITH GENERALLY WEAK LOWER
LEVEL FLOW. HIGH TEMPERATURES WILL REMAIN NEAR SEASONAL AVERAGES
WITH PATCHY LATE NIGHT AND EARLY MORNING COASTAL LOW CLOUDS AND FOG
POSSIBLE.
&&
.AVIATION...
160930Z...CLEAR AND VFR CONDITIONS ARE EXPECTED TODAY AND TONIGHT.
NORTHEAST WINDS WILL GUST THROUGH CORRIDORS THROUGH/BELOW FOOTHILLS
THROUGH ABOUT 19Z. LLWS IS EXPECTED WHERE WINDS DO NOT QUITE
SURFACE...SUCH AS AT KSNA THROUGH 17Z.
&&
.FIRE WEATHER...
GUSTY NORTHEAST TO EAST WINDS WILL CONTINUE THROUGH THIS MORNING
NEAR THE COASTAL FOOTHILLS WITH LOCAL GUSTS TO AROUND 45 MPH. LOWEST
HUMIDITIES FOR INLAND AREAS WILL FALL TO AROUND 10 PERCENT TODAY.
WINDS WILL WEAKEN BY LATE MORNING...THOUGH VERY DRY CONDITIONS WILL
PREVAIL THROUGH THE AFTERNOON WITH HUMIDITIES AROUND 8 TO 15
PERCENT. CONDITIONS ARE NOT EXPECTED TO REACH CRITICAL FIRE
WEATHER THRESHOLDS.
A MODEST RECOVERY IN HUMIDITIES WITH WEAKER WINDS FOR THURSDAY...
THEN ANOTHER ROUND OF GUSTY NORTHEAST WINDS FRIDAY WITH GUSTS TO
AROUND 40 MPH AND LOWER HUMIDITIES. AS WITH TODAY...IT DOES NOT
APPEAR CRITICAL FIRE WEATHER THRESHOLDS WILL BE MET.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...WIND ADVISORY UNTIL NOON PDT TODAY FOR THE SAN DIEGO COUNTY
MOUNTAINS...SAN DIEGO COUNTY VALLEYS.
WIND ADVISORY UNTIL NOON PDT TODAY FOR THE ORANGE COUNTY
COASTAL AREAS...SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE
INLAND EMPIRE...SANTA ANA MOUNTAINS AND FOOTHILLS.
PZ...NONE.
&&
$$
PUBLIC...17
AVIATION/MARINE...MM