498
FXUS66 KSGX 151009
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
309 AM PDT THU MAY 15 2025
SYNOPSIS
DRY AND WARMER THROUGH FRIDAY. COOLER, CLOUDIER, AND WINDIER WITH
CHANCES OF PRECIPITATION ALONG AND WEST OF THE MOUNTAINS OVER THE
WEEKEND. WARMER WITH A SHALLOWER MARINE LAYER EXPECTED NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SATURDAY NIGHT)
THE WARMING TREND WILL CONTINUE TODAY WITH HIGH TEMPERATURES FOR
INLAND AREAS ANOTHER 5 TO 10 DEGREES WARMER THAN WEDNESDAY WITH
NOT MUCH CHANGE FOR FRIDAY. HIGH TEMPERATURES TODAY WILL BE A FEW
DEGREES BELOW AVERAGE WITH HIGH TEMPERATURES RANGING FROM THE MID
60S NEAR THE COAST TO THE MID 70S TO LOWER 80S FOR THE INLAND
EMPIRE WITH THE LOWER DESERTS IN THE UPPER 80S TO MID 90S.
THE MARINE LAYER WILL REMAIN NEAR 2000 TO 2500 FEET DEEP INTO
FRIDAY WITH NIGHT AND MORNING LOW CLOUDS EXTENDING INLAND INTO
PORTIONS OF THE INLAND VALLEYS.
A LOW PRESSURE SYSTEM FROM THE NORTHWEST WILL BRING COOLER
WEATHER FOR THE WEEKEND WITH STRONGER AND GUSTY WEST WINDS FOR THE
MOUNTAINS AND DESERTS. HIGH TEMPERATURES FOR INLAND AREAS WILL BE
5 TO 10 DEGREES COOLER ON SATURDAY WITH ANOTHER 5 DEGREES OF
COOLING FOR THE MOUNTAINS AND DESERTS ON SUNDAY. THERE WILL BE
PERIODS OF STRONGER AND GUSTY WEST WINDS FOR THE MOUNTAINS AND
DESERTS FOR SATURDAY AFTERNOON INTO SUNDAY. THE STRONGEST WINDS
ARE EXPECTED ON SATURDAY AFTERNOON AND EVENING WITH GUSTS TO 40 TO
50 MPH AND ISOLATED GUSTS TO 65 TO 75 MPH IN THE NORTHERN
COACHELLA VALLEY BELOW THE SAN GORGONIO PASS.
THE MARINE LAYER WILL DEEPEN TO 5000 TO 5500 FEET DURING THE
WEEKEND WITH COASTAL LOW CLOUDS EXTENDING WELL INLAND AND ONTO THE
COASTAL SLOPES OF THE MOUNTAINS. THERE COULD BE SOME LIGHT
PRECIPITATION FOR COASTAL AREAS FOR LATE FRIDAY NIGHT INTO
SATURDAY MORNING AS THE MARINE LAYER DEEPENS. THE MOST LIKELY TIME
FOR PRECIPITATION IS ON SATURDAY NIGHT WITH THE MOST LIKELY
LOCATION FOR SAN DIEGO COUNTY FROM THE COAST TO THE MOUNTAINS.
MOST AMOUNTS ARE EXPECTED TO BE LIGHT WITH CHANCES FOR ONE-TENTH
INCH OR MORE OF RAINFALL RANGING FROM AROUND 5 PERCENT NEAR THE
COAST TO 10 TO 15 PERCENT ON THE COASTAL SLOPES OF THE MOUNTAINS.
LONG TERM (SUNDAY THROUGH WEDNESDAY)
THE MOUNTAINS AND DESERTS WILL COOL ANOTHER 5 DEGREES ON SUNDAY
WITH HIGH TEMPERATURES ON SUNDAY AS MUCH AS 15 TO 20 DEGREES BELOW
AVERAGE FOR THE MOUNTAINS. HIGH TEMPERATURES ON SUNDAY WILL RANGE
FROM THE LOWER TO MID 60S NEAR THE COAST TO THE 60S AND LOWER 70S
FOR THE IN THE INLAND EMPIRE WITH THE LOWER DESERTS IN THE UPPER
70S TO MID 80S. A SLIGHT CHANCE OF MOSTLY LIGHT SHOWERS WILL
CONTINUE INTO SUNDAY MORNING, MOSTLY FOR SAN DIEGO COUNTY FROM THE
COAST TO THE MOUNTAINS. GUSTY WEST WINDS FOR THE MOUNTAINS AND
DESERTS WILL CONTINUE INTO EARLY SUNDAY EVENING, BUT THE WINDS
WILL NOT BE QUITE AS STRONG AS THOSE FOR SATURDAY AFTERNOON AND
EVENING.
DRY WEATHER WILL FOLLOW FOR NEXT WEEK. WARMING WILL BEGIN ON
MONDAY AND CONTINUE ON TUESDAY AND WEDNESDAY WITH HIGH
TEMPERATURES AS MUCH AS 5 TO 10 DEGREES ABOVE AVERAGE ON WEDNESDAY
FOR THE COAST AND VALLEYS. ON WEDNESDAY, HIGH TEMPERATURES WILL
RANGE FROM THE LOWER TO MID 70S NEAR THE COAST TO AROUND 90 FOR
THE INLAND EMPIRE WITH 100 TO 104 FOR THE LOWER DESERTS.
A DEEP MARINE LAYER ON MONDAY WILL BECOME SHALLOWER WITH NIGHT AND
MORNING COASTAL LOW CLOUDS NOT EXTENDING INLAND MUCH PAST THE
WESTERN VALLEYS BY WEDNESDAY.
AVIATION
150930Z...COAST/VALLEYS...LOW CLOUDS BASED AT 1300-1800 FEET MSL
WITH TOPS TO 2000 FEET WILL CONTINUE TO EXPAND IN COVERAGE INTO
PARTS OF THE INLAND VALLEYS THROUGH 14Z. SCATTER OUT 16-17Z. LOW
CLOUDS WITH SIMILAR BASES WILL MOVE ASHORE AFTER 03Z AND HEAD A
LITTLE FARTHER INLAND OVERNIGHT.
MOUNTAINS/DESERTS
MOSTLY CLEAR SKIES TODAY AND TONIGHT,
EXCEPT FOR SOME CUMULUS BASED AROUND 8000-10000 FEET MSL OVER THE
MOUNTAINS 18-01Z.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED TODAY THROUGH SATURDAY.
STRONGER WINDS AND HIGHER SEAS ARE EXPECTED LATE SATURDAY INTO
SUNDAY, PROBABLY LEADING TO HAZARDOUS BOATING CONDITIONS IN THE
OUTER COASTAL WATERS. WINDS AND WAVES GRADUALLY SUBSIDE LATER SUNDAY
INTO MONDAY.
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...MARTIN
AVIATION/MARINE...MM
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