250
FXUS66 KSGX 041132
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
332 AM PST TUE NOV 4 2025
SYNOPSIS
THE MARINE LAYER WILL CONTINUE TO DEEPEN THROUGH TONIGHT WITH
PATCHY DRIZZLE EARLY THIS MORNING FOR THE COAST AND WESTERN
VALLEYS WITH A SLIGHT CHANCE OF LIGHT SHOWERS FOR LATE TONIGHT
FOR THE COAST WATERS INLAND INTO COASTAL ORANGE COUNTY. IT WILL BE
COOLER ON WEDNESDAY AND BREEZY IN THE MOUNTAINS AND DESERTS, THEN
DRY AND WARMER FOR THE FRIDAY THROUGH THE WEEKEND. A LOW PRESSURE
SYSTEM DEVELOPING WELL OFF THE CALIFORNIA COAST EARLY NEXT WEEK
COULD BRING SOME PRECIPITATION BY 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 THURSDAY)
THE MARINE LAYER IS SLOWLY DEEPENING AND IS AROUND 1200 TO 1500
FEET DEEP WITH WIDESPREAD LOW CLOUDS OVER THE COASTAL WATERS
EXTENDING INLAND INTO THE WESTERN VALLEYS. THERE HAVE BEEN SOME
REPORTS OF 0.01 INCH OF RAINFALL FROM PATCHY DRIZZLE, MAINLY FOR
INLAND ORANGE COUNTY AND FOR INLAND COASTAL AREAS AND THE WESTERN
VALLEYS IN SAN DIEGO COUNTY.
FOR TONIGHT AND WEDNESDAY, A LOW PRESSURE SYSTEM MOVING INLAND TO
THE NORTH WILL STRENGTHEN THE ONSHORE FLOW ACROSS SOUTHERN
CALIFORNIA AND DEEPEN THE MARINE LAYER. LOW CLOUDS FOR LATE TONIGHT
WILL SPREAD INTO PORTIONS OF THE INLAND VALLEYS WITH FASTER
CLEARING FOR SAN DIEGO COUNTY ON WEDNESDAY MORNING. THE HREF SHOWS
SOME LIGHT SHOWERS DEVELOPING LATE TONIGHT ACROSS THE SOUTHERN
CALIFORNIA COASTAL WATERS, SPREADING LOCALLY INLAND NEAR THE COAST
FOR ORANGE COUNTY NORTHWARD. THERE WILL BE STRONGER AND GUSTY
SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND DESERTS FOR
WEDNESDAY AFTERNOON AND EVENING WITH GUSTS TO 25 TO 35 MPH ALONG
AND BELOW THE DESERT SLOPES OF THE MOUNTAINS WITH GUSTS TO AROUND
45 MPH IN THE NORTHERN COACHELLA VALLEY BELOW THE SAN GORGONIO
PASS.
HIGH TEMPERATURES TODAY WILL BE SLIGHTLY COOLER, THEN AS MUCH AS
4 TO 8 DEGREES COOLER ON WEDNESDAY FOR THE VALLEYS. HIGH
TEMPERATURES ON WEDNESDAY WILL RANGE FROM THE MID TO UPPER 60S
NEAR THE COAST TO THE LOWER TO MID 70S FOR THE VALLEYS WITH THE
LOWER DESERTS IN THE MID TO UPPER 80S. ON THURSDAY, THE COAST AND
VALLEYS WILL BEGIN TO WARM SLIGHTLY WHILE THE MOUNTAINS AND
DESERTS CONTINUE TO COOL SLIGHTLY.
LONG TERM (FRIDAY THROUGH MONDAY)
HIGH PRESSURE ALOFT WILL STRENGTHEN ACROSS CALIFORNIA FOR THE
WEEKEND. THE GREATEST WARMING IS EXPECTED ON FRIDAY FOR THE INLAND
VALLEYS ONTO THE LOWER COASTAL MOUNTAIN SLOPES AS THE MARINE LAYER
BECOMES SHALLOWER. THERE WILL BE SLIGHT ADDITIONAL WARMING DURING
THE WEEKEND. SUNDAY HIGH TEMPERATURES WILL BE MOSTLY 5 TO 10
DEGREES ABOVE AVERAGE FOR INLAND AREAS, RANGING FROM THE LOWER TO
MID 70S NEAR THE COAST TO THE 80S FOR THE INLAND EMPIRE WITH THE
LOWER DESERTS AROUND 90.
A LOW PRESSURE SYSTEM DEVELOPING WELL OFF THE CALIFORNIA COAST
EARLY NEXT WEEK COULD BRING SOME PRECIPITATION BY THE MIDDLE OF
NEXT WEEK. NBM CHANCES FOR MEASURABLE RAINFALL REMAIN BELOW 10
PERCENT THROUGH TUESDAY, THEN INCREASE TO AROUND 20 PERCENT ON
WEDNESDAY AND 50 PERCENT ON THURSDAY. FOR WEDNESDAY AND THURSDAY
COMBINED, NBM HAS AROUND A 20 PERCENT CHANCE FOR ONE INCH OR MORE
OF RAINFALL FOR BIG BEAR WITH SNOW LEVELS FALLING FROM AROUND
8500 FEET ON THURSDAY TO 7500 FEET ON FRIDAY.
AVIATION
041030Z...COASTS/VALLEYS...LOW CLOUDS BASED AT 800-1200 FEET MSL
WITH TOPS TO 1500 FEET WILL CONTINUE TO MARCH INTO PARTS OF THE
INLAND VALLEYS THIS MORNING. VIS 0-5SM OVER HIGHER COASTAL TERRAIN
AND IN INLAND VALLEYS. SCATTER OUT IS EXPECTED 16-18Z. LOW CLOUDS
WITH HIGHER BASES AROUND 1200-1800 FEET MSL WILL PUSH ASHORE
00-03Z, AND SPREAD INTO MOST OF THE COASTAL BASIN OVERNIGHT INTO
WEDNESDAY. VIS REDUCTIONS 0-5SM FOR INLAND VALLEYS AND COASTAL
HILLS.
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS TODAY AND
TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY.
BEACHES
LONG PERIOD WEST-NORTHWEST SWELL WILL ARRIVE THURSDAY, PEAK THURSDAY
NIGHT, AND GRADUALLY DIMINISH FRIDAY. SURF OF 4-5 FEET IS EXPECTED,
HIGHEST ON WEST-FACING BEACHES. THIS WILL PRESENT A HIGH RIP CURRENT
RISK.
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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