040
FXUS66 KSGX 091016
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
316 AM PDT THU APR 9 2026
SYNOPSIS
INCREASING ONSHORE FLOW AND A PAIR OF LOW PRESSURE SYSTEMS FROM
THE NORTHWEST WILL BRING A COOLING TREND THROUGH THE WEEKEND WITH
STRONGER AND GUSTY SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND
DESERTS DURING THE AFTERNOONS AND EVENINGS THROUGH SUNDAY WITH GUSTS
TO 35 TO 45 MPH TODAY, AND 40 TO 50 MPH FOR FRIDAY THROUGH SUNDAY.
THERE IS A CHANCE OF SHOWERS FOR LATE FRIDAY INTO SATURDAY. A
SECOND LOW PRESSURE SYSTEM FROM THE NORTHWEST WILL BRING
ADDITIONAL SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS FOR LATE
SATURDAY NIGHT THROUGH SUNDAY. DECREASING SHOWERS COULD LINGER
INTO SUNDAY NIGHT AND MONDAY MORNING. THEN DRYING AND WARMING
THROUGH THE MIDDLE OF NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SATURDAY)
A LOW PRESSURE SYSTEM WILL MOVE TOWARD THE COAST OF NORTHERN AND
CENTRAL CALIFORNIA TODAY, THEN WEAKEN AS IT MOVES INLAND THROUGH
SOUTHERN CALIFORNIA LATE FRIDAY AND FRIDAY NIGHT. ONSHORE FLOW
WILL STRENGTHEN AND SPREAD COOLING INLAND THROUGH THE WEEKEND.
HIGH TEMPERATURES FOR TODAY WILL COOL A FEW DEGREES FOR INLAND
AREAS TO AROUND 5 DEGREES FOR THE MOUNTAINS. FRIDAY HIGH
TEMPERATURES WILL BE A FEW DEGREES COOLER NEAR THE COAST TO 4 TO
8 DEGREES FOR INLAND AREAS WITH SIMILAR ADDITIONAL COOLING ON
SATURDAY. HIGH TEMPERATURES OF 5 TO 10 DEGREES ABOVE AVERAGE TODAY
WILL COOL THROUGH SATURDAY WITH SATURDAY HIGH TEMPERATURES AS
MUCH AS 5 TO 10 DEGREES BELOW AVERAGE FOR THE MOUNTAINS.
HIGH TEMPERATURES FOR TODAY WILL RANGE FROM THE LOWER TO MID 70S
NEAR THE COAST TO THE UPPER 70S AND LOWER 80S FOR THE INLAND
EMPIRE WITH THE LOWER DESERTS IN THE LOWER TO MID 90S. FOLLOWING
THE COOLING OF TODAY THROUGH SATURDAY, SATURDAY HIGH TEMPERATURES
WILL BE MOSTLY IN THE MID 60S TO LOWER 70S FOR THE COAST AND
VALLEYS WITH THE LOWER DESERTS IN THE UPPER 70S TO MID 80S.
THERE WILL BE GUSTY SOUTHWEST TO WEST WINDS EACH AFTERNOON AND
EVENING FOR THE MOUNTAINS AND DESERTS WITH GUSTS TO 35 TO 45 MPH
TODAY, AND 40 TO 50 MPH ON FRIDAY AND SATURDAY.
THERE IS A CHANCE OF SHOWERS FOR LATE FRIDAY INTO SATURDAY WITH
RAINFALL FROM THE COAST TO THE MOUNTAINS MOSTLY ONE-TENTH INCH OR
LESS TO LOCALLY ONE- QUARTER INCH IN THE MOUNTAINS. A SNOW LEVEL
ABOVE 8000 FEET ON FRIDAY WILL LOWER TO 6500 TO 7000 FEET ON
SATURDAY.
LONG TERM (SATURDAY NIGHT THROUGH WEDNESDAY)
A SECOND STRONGER AND COLDER LOW PRESSURE SYSTEM WILL MOVE INTO
CALIFORNIA ON LATE SATURDAY THROUGH SUNDAY, POSSIBLY LINGERING
INTO MONDAY MORNING. THIS SYSTEM IS EXPECTED TO BRING MORE
WIDESPREAD SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS TO
SOUTHWESTERN CALIFORNIA FOR LATE SATURDAY NIGHT THROUGH SUNDAY
AFTERNOON WITH RAINFALL RANGING FROM AROUND ONE-THIRD INCH NEAR
THE COAST TO ONE-HALF TO LOCALLY ONE INCH IN THE MOUNTAINS WITH
LESS THAN ONE-QAURTER INCH IN THE HIGH DESERT AND LESS THAN ONE-
TENTH INCH IN THE LOWER DESERTS. SOME ADDITIONAL SHOWERS COULD
LINGER INTO SUNDAY NIGHT AND MONDAY MORNING. THE SNOW LEVEL WILL
LOWER TO 6000 TO 6500 FEET ON SUNDAY AND 5000 TO 5500 FEET FOR
LATE SUNDAY NIGHT INTO MONDAY MORNING.
HIGH TEMPERATURES ON SUNDAY WILL COOL ANOTHER FEW DEGREES NEAR THE
COAST TO 4 TO 8 DEGREES INLAND WITH HIGH TEMPERATURES FOR INLAND
AREAS MOSTLY 10 TO 15 DEGREES BELOW AVERAGE TO AS MUCH AS 15 TO 20
DEGREES BELOW AVERAGE FOR THE MOUNTAINS ABOVE 6000 FEET. HIGH
TEMPERATURES ON SUNDAY WILL BE MOSTLY IN THE 60S FOR THE COAST AND
VALLEYS WITH THE LOWER DESERTS IN THE 70S. WEST TO NORTHWEST WINDS
ON SUNDAY WILL GUST TO 40 TO 50 MPH FOR THE MOUNTAINS AND DESERTS
FOR THE AFTERNOON INTO THE EVENING.
THEN DRYING WITH A WARMING TREND THROUGH WEDNESDAY WITH WEDNESDAY
HIGH TEMPERATURES AROUND 5 DEGREES ABOVE AVERAGE WITH HIGH
TEMPERATURES RANGING FROM AROUND 70 NEAR THE COAST TO THE MID 70S
TO LOWER 80S FOR THE INLAND EMPIRE WITH THE LOWER DESERTS IN THE
UPPER 80S.
AVIATION
090930Z...LOW CLOUDS WITH BASES 900-1400 FEET MSL WILL EVENTUALLY
COVER MOST OF THE COASTAL AREAS THIS MORNING, MOST LIKELY BETWEEN 12-
16Z. SCATTER OUT 15-17Z. LOW CLOUDS WITH SLIGHTLY HIGHER BASES WILL
REDEVELOP AROUND 04Z FRI AND ARE EXPECTED TO REACH INTO THE VALLEYS
OVERNIGHT. WESTERLY WINDS 25-35 KTS OVER THE MTNS/DESERT FOOTHILLS
INTO THE DESERTS WILL DIMINISH A LITTLE THIS MORNING. WINDS WILL
STRENGTHEN TO 35-45 KTS AFTER 01Z AND CONTINUE OVERNIGHT INTO
FRIDAY. MOD UP/DOWNDRAFTS EXPECTED IN LEE OF RIDGES. PATCHY BLDU IN
DESERTS REDUCING VIS 3-5SM.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH MONDAY, EXCEPT
FOR SUNDAY, WHEN THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ALONG
WITH STRONGER NORTHWEST WINDS AND CHOPPY SEAS THAT COULD GENERATE
HAZARDOUS CONDITIONS.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE...MM
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