076
FXUS66 KSGX 200437
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
937 PM PDT SAT SEP 19 2026
SYNOPSIS
TEMPERATURES REMAIN BELOW NORMAL UNTIL WEDNESDAY WITH A PRESENT
MARINE LAYER. WARMER WEATHER RETURNS FOR THE END OF NEXT WEEK AS
HIGH PRESSURE BUILDS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION DISCUSSION
NOT MUCH CHANGE TO THE FORECAST OVER THE PAST 24 HOURS. IN THE SHORT
TERM, UPPER LEVEL RIDING WILL ALLOW FOR TEMPERATURES TO WARM CLOSER
TO NORMAL TODAY, WITH HIGHS IN THE MID 70S ALONG THE COAST, 80S FOR
INLAND SPOTS AND HIGH DESERT, AND AROUND 100 FOR THE LOWER DESERTS.
AFTERNOON HUMIDITY WILL FALL TO AROUND 10% FOR AREAS EAST OF THE
MOUNTAINS TODAY, WITH THESE DRIER CONDITIONS PREVAILING INTO SUNDAY
EVEN AS TEMPERATURES COOL A DEGREE OR TWO FOR SUNDAY AFTERNOON.
MID-LEVEL WATER VAPOR SATELLITE SHOWS A DEEPENING LOW OFF THE COAST
OF CA WHICH IS EXPECTED TO MOVE INLAND LATE THIS WEEKEND, KICKING
THE AFOREMENTIONED RIDGE EASTWARD. WITH THAT, A COOLING TREND SETS
IN BEGINNING SUNDAY, WITH MORE SIGNIFICANT COOLING MONDAY AS THE LOW
SETTLES OVER CENTRAL CA. SOUTHWEST FLOW AND LOWER HEIGHTS WILL
ENCOURAGE A DEEPER MARINE LAYER MONDAY AND TUESDAY MORNINGS, WITH
LOW (10-15% CHANCE) OF SOME LOCALIZED MARINE LAYER DRIZZLE EITHER OF
THOSE MORNINGS. CLOUDS WILL MAKE IT FURTHER INLAND, WITH SLOW
CLEARING AT THE COASTLINE IN THE AFTERNOONS. HIGHS ON MONDAY MAY NOT
BREAK ABOVE THE 70S FOR MANY LOCATIONS, WITH ONLY DOUBLE DIGITS IN
THE LOWER DESERTS. THESE HIGHS WILL GENERALLY BE 5-13 DEGREES BELOW
WHERE THEY NORMALLY ARE FOR THE LATTER HALF OF SEPTEMBER.
THE COOLER WEATHER WON'T PREVAIL BEYOND TUESDAY AS THE LOW BECOMES
ABSORBED INTO THE UPPER LEVEL PATTERN AND SWINGS NORTHWARD THANKS TO
A MASSIVE LOW SITTING OFF THE CANADIAN COASTLINE. WITH THE
DEPARTURE, SUBSIDENCE WILL START TO BUILD OVER THE SOCAL WATERS LATE
NEXT WEEK. MODELS STILL DISAGREE ON THE EXTENT OF HIGH PRESSURE AND
WHERE IT MIGHT SET UP, AS WELL AS THE PROPAGATION OF THE CANADIAN
LOW. DUE TO THIS, THERE REMAINS A LARGE SPREAD ON FORECASTED HIGH
TEMPERATURES FOR THE LATTER HALF OF NEXT WEEK AND INTO THE WEEKEND,
ALTHOUGH GENERAL CONSENSUS IS THAT TEMPERATURES WILL WARM AT LEAST
TO NEAR OR SLIGHTLY ABOVE NORMAL. THE FORECAST MAY CHANGE IN THE
COMING DAYS AS MODELS BECOME BETTER ALIGNED WITH THE OVERALL
PATTERN, BUT QUIETER WEATHER SEEMS TO PREVAIL FOR NOW.
AVIATION
200430Z...COAST/VALLEYS...LOW CLOUDS WITH CIGS ~1500-2200FT MSL WILL
BECOME MORE WIDESPREAD AND REACH UP TO 20 MILES INLAND BY 12Z. THERE
IS A ~30-40% CHANCE FOR CIGS TO REACH KONT BETWEEN 12-16Z. CIGS
SCATTER BACK OUT 16-18Z SUNDAY, WITH HIGHEST CONFIDENCE IN SCATTER
OUT TIMING FOR INLAND LOCATIONS. IT'S POSSIBLE CLEARING WILL BE
SLOWER ALONG THE COAST. LOW CLOUDS WILL RETURN 01-04Z MON ALONG THE
COAST WITH INCREASED CHANCES OF CIGS FILLING IN THE COASTAL BASIN BY
MON AM.
MOUNTAINS/DESERTS...VFR CONDITIONS THROUGH SUNDAY WITH SCT HIGH
CLOUDS AOA 20000 FT MSL IN THE DESERT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH THURSDAY.
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...ZUBER
AVIATION/MARINE...CO
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page