427
FXUS66 KSGX 260718
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1218 AM PDT FRI JUN 26 2026
SYNOPSIS
THE COOLING TREND WILL CONTINUE THROUGH SUNDAY WITH HIGH
TEMPERATURES ON SUNDAY AS MUCH AS 15 TO 20 DEGREES BELOW AVERAGE
FOR THE MOUNTAINS AND VALLEYS. THERE WILL BE STRONGER AND GUSTY
SOUTHWEST TO WEST FOR THE MOUNTAINS AND DESERTS EACH AFTERNOON
AND EVENING THROUGH SUNDAY WITH GUSTS TO 30 TO 40 MPH AND WITH
GUSTS TO 65 TO 75 MPH FOR THE NORTHERN COACHELLA VALLEY BELOW THE
SAN GORGONIO PASS. THE MARINE LAYER WILL SLOWLY DEEPEN WITH NIGHT
AND MORNING COASTAL LOW CLOUDS EXTENDING ONTO THE COASTAL SLOPES
OF THE MOUNTAINS BY SUNDAY. IT WILL BE GRADUALLY WARMER NEXT WEEK,
BUT WITH HIGH TEMPERATURES THROUGH THURSDAY REMAINING BELOW
AVERAGE, AS MUCH AS 5 TO 10 DEGREES BELOW AVERAGE ON THURSDAY FOR
THE MOUNTAINS AND INLAND EMPIRE.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SUNDAY)
ONSHORE FLOW WILL STRENGTHEN THROUGH SATURDAY WITH THE COOLING
TREND CONTINUING THROUGH SUNDAY. HIGH TEMPERATURES ON SUNDAY WILL
BE AS MUCH AS 15 TO 20 DEGREES BELOW AVERAGE FOR THE MOUNTAINS AND
INLAND EMPIRE. HIGH TEMPERATURES ON SUNDAY WILL RANGE FROM THE MID
60S TO LOWER 70S NEAR THE COAST TO THE 70S FOR THE INLAND EMPIRE
WITH THE 90S FOR THE LOWER DESERTS.
THE MARINE LAYER WILL DEEPEN TO AROUND 4000 FEET ON SUNDAY WITH
NIGHT AND MORNING COASTAL LOW CLOUDS EXTENDING WELL INLAND AND
ONTO THE COASTAL SLOPES OF THE MOUNTAINS.
WITH THE STRONGER ONSHORE FLOW, THERE WILL BE STRONGER AND GUSTY
SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND DESERTS EACH
AFTERNOON AND EVENING. THE STRONGEST WINDS ARE EXPECTED ON
SATURDAY WITH GUSTS TO 30 TO 40 MPH AND WITH GUSTS IN THE NORTHERN
COACHELLA VALLEY BELOW THE SAN GORGONIO PASS TO 75 MPH.
LONG TERM (MONDAY THROUGH THURSDAY)
THERE WILL BE A GRADUAL WARMING TREND FOR MONDAY THROUGH THURSDAY.
HIGH TEMPERATURES ON MONDAY WILL BE A FEW TO AROUND 5 DEGREES
WARMER THAN SUNDAY WITH NOT MUCH CHANGE ON TUESDAY. WEDNESDAY
WILL BE A FEW DEGREES WARMER AS WILL THURSDAY. EVEN WITH THE
WARMING, HIGH TEMPERATURES ON THURSDAY WILL STILL BE AS MUCH AS 5
TO 10 DEGREES BELOW AVERAGE FOR THE MOUNTAINS AND VALLEYS. HIGH
TEMPERATURES ON THURSDAY WILL RANGE FROM THE MID 60S TO LOWER 70S
NEAR THE COAST TO THE UPPER 70S TO MID 80S FOR THE INLAND EMPIRE
WITH THE UPPER 90S TO 102 FOR THE LOWER DESERTS.
THE MARINE LAYER WILL SLOWLY DECREASE IN DEPTH THROUGH THURSDAY,
BUT NIGHT AND MORNING LOW CLOUDS WILL STILL SPREAD INTO PORTIONS
OF THE INLAND VALLEYS LATE EACH NIGHT THROUGH THURSDAY.
AVIATION
260530Z...COAST/VALLEYS...PATCHY LOW CLOUDS BASED 1600-2200 FT MSL
ARE EXPANDING IN THE LOWLANDS, EVENTUALLY REACHING INTO THE INLAND
VALLEYS BY 08Z, AND PARTIALLY FILLING IN TO THE INLAND EMPIRE 07-
13Z. MINOR VIS REDUCTIONS (3-6SM) EXPECTED FOR ELEVATED INLAND
VALLEYS (KSBD, KRNM). CLOUDS CLEAR TOWARD THE COASTLINE 15-18Z FRI
WITH SKC EXPECTED FOR THE AFTERNOON. PATCHY CLOUDS WITH SLIGHTLY
HIGHER BASES ARE EXPECTED TO DEVELOP NEAR THE COAST AROUND 01-04Z
SAT BEFORE PUSHING INLAND AGAIN.
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS EXPECTED THROUGH
FRIDAY EVENING, EXCEPT FOR COASTAL SLOPES SHROUDED IN FOG BELOW 3500
FEET MSL 10-15Z FRIDAY. WEST-SOUTHWEST WINDS GUSTING 20-30 KTS GUSTS
AND UP TO 45 KTS THROUGH MTN PASSES TO REMAIN LOCALIZED THROUGH
FRIDAY MORNING BEFORE INCREASING AFTER 21Z. GUSTS 25-40 KTS TO OCCUR
FRIDAY EVENING IN PARTS OF DESERT VALLEYS AND SLOPES WITH GUSTS
LOCALLY TO 55 KTS THROUGH THE PASSES. THERE IS A 25% CHANCE FOR
GUSTS EXCEEDING 35 KTS FRIDAY EVENING AT KPSP AND HIGHER CHANCES IN
THE VCNTY, NORTH AND EAST OF KPSP. OCCASIONAL MOD UP/DOWNDRAFTS IN
LEE OF MOUNTAINS.
MARINE
BREEZY NW WINDS GUSTING OVER 20 KTS SATURDAY AFTERNOON AND EVENING
NEAR SAN CLEMENTE ISLAND WILL CREATE HAZARDOUS CONDITIONS TO SMALL
CRAFT. OTHERWISE, NO ADDITIONAL HAZARDOUS MARINE CONDITIONS ARE
EXPECTED THROUGH WEDNESDAY.
FIRE WEATHER
SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND DESERTS WILL GUST TO
30 TO 40 MPH FOR THIS AFTERNOON AND EVENING WITH GUSTS TO 55 MPH
IN THE NORTHERN COACHELLA VALLEY BELOW THE SAN GORGONIO PASS.
LOWEST HUMIDITY FOR THIS AFTERNOON AND EARLY EVENING FOR THE APPLE
AND LUCERNE VALLEYS WILL FALL TO 10 TO 15 PERCENT AND FOR THE
LOWER DESERTS TO AROUND 10 PERCENT. THIS WILL RESULT IN NEAR
CRITICAL FIRE WEATHER CONDITIONS FOR THIS AFTERNOON AND EARLY
EVENING FOR THE DESERTS ONTO THE DESERT SLOPES OF THE MOUNTAINS.
STRONGER WINDS WILL CONTINUE FOR SATURDAY AFTERNOON AND EVENING
FOR THE MOUNTAINS AND DESERTS, BUT WITH LOWEST HUMIDITY FOR THE
DESERTS ON SATURDAY RECOVERING TO 15 TO 25 PERCENT.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...WIND ADVISORY FROM 11 AM FRIDAY TO 5 AM PDT SUNDAY FOR APPLE AND
LUCERNE VALLEYS.
WIND ADVISORY FROM 5 PM FRIDAY TO 11 AM PDT SUNDAY FOR SAN DIEGO
COUNTY DESERTS.
WIND ADVISORY FROM 11 AM FRIDAY TO 5 PM PDT SUNDAY FOR SAN
GORGONIO PASS NEAR BANNING.
PZ...NONE.
PUBLIC/FIRE WEATHER...17
AVIATION/MARINE...WESTERINK
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