677
FXUS66 KSGX 240857
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
154 AM PDT THU SEP 24 2026
SYNOPSIS
WARMER THROUGH SATURDAY WITH MODERATE HEATRISK FOR THE COAST AND
WESTERN VALLEYS ON FRIDAY AND SATURDAY. NIGHT AND MORNING LOW
CLOUDS AND FOG WILL STAY CONFINED TO THE COASTAL AREAS FOR THE NEXT
FEW NIGHTS. THERE IS A SLIGHT CHANCE OF SHOWERS OVER THE MOUNTAINS
THIS AFTERNOON. TROPICAL MID AND HIGH LEVEL MOISTURE WILL BRING MORE
CLOUDS AND A CHANCE OF SHOWERS ON SUNDAY FOLLOWED BY DRYING FROM THE
NORTHWEST SOME TIME FOR MONDAY INTO TUESDAY.
WARMER FOR TUESDAY AND WEDNESDAY, ESPECIALLY FOR THE COAST AND
VALLEYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SATURDAY)
A WEAK UPPER LEVEL LOW PRESSURE SYSTEM OFF COAST OF NORTHERN BAJA
WILL BRING AN INCREASE IN MID-LEVEL MONSOONAL MOISTURE TODAY WITH
A SLIGHT CHANCE OF SHOWERS FOR THE MOUNTAINS FOR THIS AFTERNOON.
THIS MOISTURE WILL THEN DECREASE FOR TONIGHT AND FRIDAY WITH THE
DRYING CONTINUING INTO SATURDAY. THE MARINE LAYER IS AROUND 2000
FEET DEEP AND IS EXPECTED TO CONTINUE TO SLOWLY DECREASE IN DEPTH
INTO SATURDAY WITH NIGHT AND MORNING COASTAL LOW CLOUDS SPREADING
INLAND LATE EACH NIGHT INTO THE WESTERN VALLEYS.
HIGH TEMPERATURES WILL CONTINUE TO WARM A FEW DEGREES PER DAY FOR
THE COAST INTO THE WESTERN VALLEYS THROUGH SATURDAY WITH LESSER
CHANGES ELSEWHERE. FOR SATURDAY, HIGH TEMPERATURES FOR THE
MOUNTAINS, DESERTS, AND INLAND EMPIRE WILL BE AROUND 5 DEGREES
ABOVE AVERAGE WITH ORANGE COUNTY 5 TO 10 DEGREES ABOVE AVERAGE AND
THE COAST AND WESTERN VALLEYS IN SAN DIEGO COUNTY 10 TO 15
DEGREES ABOVE AVERAGE. HIGH TEMPERATURES ON SATURDAY WILL RANGE
FROM THE 80S NEAR THE COAST TO THE 90S FOR THE VALLEYS WITH 100
TO 104 FOR THE LOWER DESERTS. LOW TEMPERATURES EARLY SATURDAY WILL
BE 5 TO 10 DEGREES ABOVE AVERAGE AT LOWER ELEVATIONS TO AS MUCH
AS 10 TO 15 DEGREES ABOVE AVERAGE FOR THE SAN DIEGO COUNTY
MOUNTAINS. THIS WILL RESULT IN MODERATE HEATRISK ON FRIDAY AND
SATURDAY AND ISOLATED MAJOR HEATRISK ON SATURDAY FOR THE ORANGE
COUNTY COASTAL PLAIN AND FOR THE COAST INTO THE VALLEYS IN SAN
DIEGO COUNTY.
LONG TERM (SUNDAY THROUGH WEDNESDAY)
FOR LATE SATURDAY NIGHT INTO SUNDAY AND POSSIBLY MONDAY, MID AND
HIGH LEVEL MOISTURE FROM TROPICAL CYCLONES ODALYS AND POLO WILL
SPREAD INTO THE AREA FROM THE SOUTHWEST AND SOUTH. SUNDAY WILL BE
MOSTLY CLOUDY WITH A CHANCE OF SHOWERS. A LOW PRESSURE SYSTEM
MOVING INLAND THROUGH CALIFORNIA IS EXPECTED TO BRING DRYING FROM
THE NORTHWEST SOME TIME MONDAY INTO TUESDAY.
HIGH TEMPERATURES ON SUNDAY WILL BE 5 TO 10 DEGREES COOLER AND
ANOTHER FEW TO 5 DEGREES COOLER FOR MONDAY WITH MONDAY HIGH
TEMPERATURES NEAR AVERAGE NEAR THE COAST AND AROUND 5 DEGREES
BELOW AVERAGE FOR INLAND AREAS. HIGH TEMPERATURES ON MONDAY WILL
RANGE FROM THE 70S NEAR THE COAST TO THE LOWER TO MID 80S FOR THE
INLAND EMPIRE WITH THE LOWER DESERTS IN THE LOWER 90S.
HIGH PRESSURE ALOFT IS EXPECTED TO BRING WARMING FOR TUESDAY AND
WEDNESDAY. IF EAST TO NORTHEAST WINDS DEVELOP, THERE COULD BE
ADDITIONAL WARMING FOR THE COAST AND VALLEYS ON THOSE DAYS.
AVIATION
240530Z...COAST/VALLEYS...LOW CLOUDS BASED NEAR 1500 FEET MSL
WILL CONTINUE TO COVER COASTAL AREAS AND EVENTUALLY SPREAD INTO
WESTERN VALLEYS OVERNIGHT. SOME INLAND VIS REDUCED 3-5SM. SCATTER
OUT THURSDAY 16-19Z. LOW CLOUDS BASED AROUND 1000 FEET MSL TO MOVE
ASHORE THURSDAY EVE AFTER 02Z, BUT IN SOMEWHAT RANDOM FASHION.
MOUNTAINS/DESERTS...MOSTLY CLEAR THROUGH THURSDAY, EXCEPT FOR SCT
CUMULUS BASED NEAR 10 KFT OVER MOUNTAINS AND ISOLATED SHRA/TSRA
20- 01Z THURSDAY AFTERNOON. ANY STORM THAT DEVELOPS WILL BE
CAPABLE OF PRODUCING GUSTY, ERRATIC WINDS, LIGHTNING, AND VIS
REDUCTIONS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH MONDAY.
BEACHES
THE COMBINATION OF A 3 FOOT SWELL FROM 190 DEGREES ON SUNDAY
SHIFTING TO 160 DEGREES FOR MONDAY AND TUESDAY WITH A 12 TO 15
SECOND PERIOD COINCIDING WITH OUR BIMONTHLY ELEVATED HIGH TIDES WILL
INCREASE CHANCES FOR COASTAL FLOODING AND EROSION. PREDICTED HIGH
TIDES OF 6.5 AND 7.0 FT MSL WILL OCCUR BETWEEN 10 AND 11 AM SUNDAY
THROUGH TUESDAY. THE LISTED TIDE PREDICTIONS HAVE BEEN CORRECTED TO
REFLECT CURRENT TRENDS IN ACTUAL TIDE OBSERVATIONS. SURF WILL BE
ELEVATED, ESPECIALLY FOR SOUTH FACING BEACHES WITH SETS UP TO 5 FEET
ON SUNDAY. SURF HEIGHTS AND DIRECTION OF THE SWELL REMAIN UNCERTAIN
FOR MONDAY AND TUESDAY AND WILL BE MOST INFLUENCED BY THE TRACK OF
TROPICAL CYCLONE POLO.
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/BEACHES...MM
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