260
FXUS66 KSGX 211051
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
351 AM PDT TUE OCT 21 2025
SYNOPSIS
COOLING WILL BEGIN TO SPREAD INLAND INTO COASTAL AREAS TODAY WITH
GREATER COOLING OF HIGH TEMPERATURES ON WEDNESDAY OF AS MUCH AS 12
TO 18 DEGREES FOR THE MOUNTAINS AND FAR INLAND VALLEYS. FOR
WEDNESDAY AND THURSDAY, THERE WILL BE PERIODS OF STRONGER
SOUTHWEST TO WEST WINDS ALONG AND BELOW THE EAST SLOPES OF THE
MOUNTAINS WITH GUSTS TO 35 TO 45 MPH. THERE IS A SLIGHT CHANCE OF
LIGHT SHOWERS FOR LATE WEDNESDAY NIGHT FOR THE SAN DIEGO COUNTY
COAST AND VALLEYS. THERE WILL BE SEVERAL DEGREES OF WARMING FOR
THURSDAY AND FRIDAY WITH HIGH TEMPERATURES ON FRIDAY FOR INLAND
AREAS AROUND 5 DEGREES ABOVE AVERAGE. A LOW PRESSURE SYSTEM MOVING
INLAND TO THE NORTH WILL BRING COOLER AND BREEZY CONDITIONS FOR
THE WEEKEND WITH A SLIGHT CHANCE OF LIGHT SHOWERS FOR LATE
SATURDAY NIGHT INTO SUNDAY FOR THE COAST TO THE MOUNTAINS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH THURSDAY)
A LOW PRESSURE SYSTEM TO THE SOUTHWEST OF THE AREA WILL MOVE
THROUGH CENTRAL AND SOUTHERN CALIFORNIA FOR LATE TONIGHT AND
WEDNESDAY. THE MARINE LAYER WILL DEEPEN INTO WEDNESDAY NIGHT WITH
A SLIGHT CHANCE OF SHOWERS FOR LATE WEDNESDAY NIGHT, MAINLY FOR
THE SAN DIEGO COUNTY COAST AND VALLEYS.
THE MARINE LAYER IS AROUND 1000 FEET DEEP WITH SATELLITE IMAGERY
SHOWING THE GREATEST COVERAGE OF LOW CLOUDS AND FOG OVER PORTIONS
OF THE COASTAL WATERS OF SAN DIEGO COUNTY EXTENDING LOCALLY
INLAND IN SAN DIEGO COUNTY TO NEAR THE MESAS. AS OF 3 AM, AIRPORTS
AT SAN DIEGO, NORTH ISLAND, AND CARLSBAD WERE ALL REPORTING
VISIBILITY OF ONE-QUARTER MILE IN DENSE FOG.
COOLING WILL BEGIN TO SPREAD INLAND INTO COASTAL AREAS TODAY WITH
GREATER COOLING OF HIGH TEMPERATURES ON WEDNESDAY OF AS MUCH AS 12
TO 18 DEGREES FOR THE MOUNTAINS AND FAR INLAND VALLEYS. WITH THE
COOLING, HIGH TEMPERATURES ON WEDNESDAY WILL RANGE FROM THE MID TO
UPPER 60S NEAR THE COAST TO THE LOWER TO MID 70S FOR THE INLAND
EMPIRE WITH THE 80S FOR THE LOWER DESERTS. HIGH PRESSURE WILL MOVE
ACROSS CALIFORNIA ON THURSDAY AND FRIDAY WILL SEVERAL DEGREES OF
WARMING FOR BOTH DAYS.
THERE WILL ALSO BE PERIODS OF STRONGER AND GUSTY WEST WINDS FOR
THE MOUNTAINS AND DESERTS WITH THE STRONGER WINDS EXPECTED ALONG
AND BELOW THE EAST SLOPES OF THE MOUNTAINS WITH GUSTS TO 35 TO 45
MPH.
LONG TERM (FRIDAY THROUGH MONDAY)
THE WARMING WILL CONTINUE INTO FRIDAY WITH FRIDAY HIGH
TEMPERATURES FOR INLAND AREAS AROUND 5 DEGREES ABOVE AVERAGE. HIGH
TEMPERATURES ON FRIDAY WILL RANGE FROM THE LOWER 70S NEAR THE
COAST TO THE LOWER TO MID 80S FOR THE INLAND EMPIRE WITH THE LOWER
90S FOR THE LOWER DESERTS.
FOR THE WEEKEND, A LOW PRESSURE SYSTEM TO THE NORTH WILL
STRENGTHEN THE ONSHORE FLOW ACROSS SOUTHERN CALIFORNIA. THE MARINE
LAYER WILL DEEPEN AND THERE WILL BE PERIODS OF STRONGER AND GUSTY
WEST WINDS FOR THE MOUNTAINS AND DESERTS. THERE WILL BE COOLING OF
SEVERAL DEGREES DURING THE WEEKEND WITH SUNDAY HIGH TEMPERATURES
AS MUCH AS 4 TO 8 DEGREES BELOW AVERAGE FOR THE VALLEYS. SUNDAY
HIGH TEMPERATURES WILL RANGE FROM AROUND 70 NEAR THE COAST TO THE
70S FOR THE INLAND EMPIRE WITH THE MID TO UPPER 80S FOR THE LOWER
DESERTS. THERE IS A SLIGHT CHANCE OF LIGHT SHOWERS LATE SATURDAY
NIGHT INTO SUNDAY MORNING FROM THE COAST TO THE MOUNTAINS.
HIGH PRESSURE WILL BRING A WARMING TREND FOR MONDAY THROUGH
WEDNESDAY OF NEXT WEEK. THERE COULD BE WEAK OFFSHORE FLOW FOR
TUESDAY AND WEDNESDAY OF NEXT WEEK WITH THE GREATER WARMING FOR
THE COAST AND VALLEYS.
AVIATION
211030Z....COAST/VALLEYS...LOW CLOUDS AND FOG BASED 200-600 FEET MSL
AND VIS 0-7SM WILL CONTINUE TO FILL MOST OF THE COASTAL AREAS
THROUGH 14Z. SCATTER OUT 15-17Z, BUT PATCHY LOW CLOUDS MAY LINGER AT
SOME BEACHES THROUGH THE AFTERNOON. LOW CLOUDS WILL PUSH ASHORE
AFTER 03Z AND HEAD INLAND, FILLING THE COASTAL BASIN OVERNIGHT INTO
WEDNESDAY. INITIAL BASES WILL BE 600-1200 FEET MSL, BUT RAPIDLY RISE
ABOVE 2000 FEET MSL BY SUNRISE WEDNESDAY.
OTHERWISE...SCT-BKN CLOUDS 10000-15000 FEET MSL WITH VFR CONDITIONS
TODAY AND TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY.
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...MM
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