835
FXUS66 KSGX 260546
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1046 PM PDT THU JUN 25 2026
SYNOPSIS
WINDY OVER THE MOUNTAINS AND INTO THE DESERTS, WELL BELOW AVERAGE
TEMPERATURES ACROSS SOUTHERN CALIFORNIA, AND A DEEPER MARINE LAYER
CAN BE EXPECTED THIS WEEKEND. AREAS OF DRIZZLE ARE POSSIBLE, WITH
SATURDAY MORNING AS THE MOST LIKELY DAY. CONDITIONS WILL GRADUALLY
WARM INTO NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
UPDATED AVIATION DISCUSSION FOR THE 06Z TAF PACKAGE
A UNSEASONABLE TROUGH OF LOW PRESSURE IS EXPECTED TO DIG INTO THE
GREAT BASIN THIS WEEKEND. THIS WILL INCREASE THE ONSHORE PRESSURE
GRADIENT, RESULTING IN STRONGER WESTERLY WINDS ON THE DESERT
MOUNTAIN SLOPES INTO THE DESERTS, WELL BELOW AVERAGE TEMPERATURES,
AND A DEEPER MARINE LAYER. BY SUNDAY, HIGHS ARE EXPECTED TO BE 7 TO
9 DEGREES BELOW AVERAGE AT THE COAST AND LOW DESERTS AND 15 TO 20
DEGREES BELOW AVERAGE IN THE VALLEYS, MOUNTAINS, AND HIGH DESERT.
THERE IS ALSO A POTENTIAL FOR PATCHY DRIZZLE WEST OF THE MOUNTAINS,
MOST LIKELY ON SATURDAY MORNING.
WINDS ON THE DESERT MOUNTAIN SLOPES AND IN THE DESERTS WILL
STRENGTHEN INTO SATURDAY. WIND GUSTS FRIDAY WILL BE 35 TO 50 MPH,
COMBINED WITH RELATIVE HUMIDITY 7 TO 15 PERCENT IN THE DESERTS
WILL CREATE PERIODS OF NEAR CRITICAL TO LOCALLY CRITICAL FIRE
WEATHER CONDITIONS IN THE DESERTS. FOR MORE INFORMATION ON FIRE
WEATHER CONCERNS, SEE THE FIRE WEATHER SECTION BELOW. WINDS ARE
EXPECTED TO PEAK IN STRENGTH ON SATURDAY AFTERNOON AND EVENING,
WITH PEAK GUSTS 50 TO 65 MPH WITH LOCALLY HIGHER GUSTS POSSIBLE
BELOW THE SAN GORGONIO PASS. WINDS WILL DECREASE SUNDAY INTO NEXT
WEEK.
GLOBAL ENSEMBLES ARE INDICATING BROAD SCALE WEAKER TROUGHING MAY
LINGER INTO THE END OF NEXT WEEK. EVEN WITH THE LINGERING TROUGHING,
HEIGHTS WILL RISE LEADING TO A GRADUAL WARMING. ABOUT 27 PERCENT OF
ENSEMBLE GUIDANCE IS INDICATING A RIDGE MAY BEGIN TO BUILD BACK IN
BY NEXT WEEKEND. BY NEXT THURSDAY, HIGHS WILL BE 3 TO 7 DEGREES
BELOW AVERAGE. ADDITIONALLY, THE WEAK TROUGHING WILL MAINTAIN A
DEEPER MARINE LAYER INTO AT LEAST THE MIDDLE OF NEXT WEEK.
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.
BEACHES
WHILE THE LONG-PERIOD SOUTH SWELL HAS DIMINISHED, A BRIEF UPTICK IN
PERIOD (15-17 SECONDS) FRIDAY AFTERNOON WILL CREATE LOCALLY ELEVATED
SURF UP TO 5 FEET ALONG SOUTH FACING BEACHES.
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...CO
AVIATION/MARINE/BEACHES...WESTERINK
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