848
FXUS66 KSGX 181753
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1053 AM PDT FRI SEP 18 2026
SYNOPSIS
HIGH TEMPERATURES WILL WARM A FEW DEGREES FOR TODAY AND SATURDAY
AND COOL A FEW DEGREES FOR SUNDAY AND MONDAY, BUT REMAIN AT LEAST
A FEW DEGREES BELOW AVERAGE FOR THE VALLEYS. HIGH PRESSURE TO THE
EAST WILL BRING A WARMING TREND BEGINNING ON TUESDAY WITH HIGH
TEMPERATURES WARMING TO AROUND AVERAGE FOR NEXT WEDNESDAY AND A
FEW DEGREES ABOVE AVERAGE FOR NEXT THURSDAY. THE MARINE LAYER WILL
BECOME SHALLOWER OVER THE WEEKEND WITH NIGHT AND MORNING COASTAL
LOW CLOUDS NOT SPREADING AS FAR INTO THE VALLEYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION DISCUSSION
SHORT TERM (TODAY THROUGH SUNDAY)
LOW PRESSURE OVER CALIFORNIA WILL WEAKEN AND MOVE INLAND TODAY
WITH HIGH PRESSURE ALOFT MOVING INLAND ACROSS CALIFORNIA ON
SATURDAY. A LOW PRESSURE SYSTEM WILL DEVELOP OFF THE CALIFORNIA
COAST ON SUNDAY AND MOVE INLAND INTO CALIFORNIA ON MONDAY.
HIGH TEMPERATURES WILL WARM A FEW DEGREES TODAY AND A FEW MORE
DEGREES ON SATURDAY WITH HIGH TEMPERATURES ON SATURDAY STILL AS
MUCH AS 5 DEGREES BELOW AVERAGE FOR THE VALLEYS. HIGH TEMPERATURES
ON SATURDAY WILL RANGE FROM THE 70S NEAR THE COAST TO THE MID 80S
TO LOWER 90S FOR THE INLAND EMPIRE WITH THE LOWER DESERTS AROUND
100. HIGH TEMPERATURES ON SUNDAY WILL BE A DEGREE OR TWO COOLER
FOR THE COAST AND VALLEYS.
THE MARINE LAYER IS AROUND 3500 TO 4000 FEET, LOWER THAN THE 4500
TO 5000 FEET FOR EARLY THURSDAY. COASTAL LOW CLOUDS WILL EXTEND
INLAND ACROSS MUCH OF THE VALLEYS INTO THIS MORNING, THEN NOT AS
FAR INTO THE VALLEYS DURING THE WEEKEND AS THE MARINE LAYER
BECOMES SHALLOWER.
LONG TERM (MONDAY THROUGH THURSDAY)
HIGH TEMPERATURES ON MONDAY WILL COOL ANOTHER FEW TO AROUND 5
DEGREES WITH THE GREATEST COOLING FOR THE INLAND VALLEYS ONTO THE
THE COASTAL SLOPES OF THE MOUNTAINS. HIGH TEMPERATURES ON MONDAY
WILL BE AS MUCH AS 5 TO 10 DEGREES BELOW AVERAGE FOR THE MOUNTAINS
AND VALLEYS WITH HIGH TEMPERATURES RANGING FROM THE LOWER TO MID
70S NEAR THE COAST TO THE UPPER 70S TO MID 80S FOR THE INLAND
EMPIRE WITH THE LOWER DESERTS IN THE UPPER 90S.
HIGH PRESSURE OVER TEXAS AND NORTHERN MEXICO IS EXPECTED TO BRING
A WARMING TREND BEGINNING ON TUESDAY AND CONTINUING FOR MUCH OF
THE REST OF NEXT WEEK, THOUGH WITH INCREASING SPREAD IN JUST HOW
MUCH WARMING MAY OCCUR. NBM HAS THE GREATER WARMING FOR TUESDAY
AND WEDNESDAY WITH LESSER ADDITIONAL WARMING FOR THURSDAY AND
FRIDAY.
HIGH TEMPERATURES WOULD WARM TO WITHIN A FEW DEGREES ABOVE AND
BELOW AVERAGE ON WEDNESDAY AND TO A FEW DEGREES ABOVE AVERAGE ON
THURSDAY. HIGH TEMPERATURES ON THURSDAY WOULD RANGE FROM THE MID
TO UPPER 70S NEAR THE COAST TO THE UPPER 80S TO MID 90S FOR THE
INLAND EMPIRE WITH 100 TO 104 FOR THE LOWER DESERTS. DRY WEATHER
IS EXPECTED TO CONTINUE THROUGH MUCH OF NEXT WEEK.
AVIATION
181800Z...COAST/VALLEYS...LOW CLOUDS BASED 3000-4000 FT MSL ARE
SWIFTLY RETREATING WEST, WITH CLEARING EXPECTED BY 19-20Z. SKC
THROUGH THE AFTERNOON, THEN CLOUDS DEVELOP THROUGHOUT LOWER SD
COUNTY 04-08Z SAT AT 2000-3000 FT MSL, BEFORE SPREADING INTO OC AND
THE SOUTH IE EARLY SAT MORNING. CLOUDS ARE UNLIKELY TO MAKE THEIR
WAY INTO VCNTY KONT/KSBD (ONLY ABOUT A 15% CHANCE FOR CIGS). CLOUDS
CLEAR OFFSHORE AGAIN 16-18Z SAT.
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS THROUGH SAT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH TUESDAY.
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...CSP
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