075
FXUS66 KSGX 252327
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
427 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 00Z 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 WILL BEGIN TO INCREASE TODAY ON THE DESERT MOUNTAIN SLOPES AND
IN THE DESERTS AND 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
252330Z...COAST/VALLEYS...LOW CLOUDS BASED NEAR OR JUST BELOW 2000
FT MSL WILL RETURN TO COASTAL SAN DIEGO COUNTY STARTING 01-03Z.
CLOUDS SPREAD NORTHWARD AND INLAND OVERNIGHT, FILLING INTO MOST OF
THE COASTAL BASIN BY 11-13Z. PORTIONS OF THE INLAND EMPIRE MAY
REMAIN SKC. 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.
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS EXPECTED THROUGH
FRIDAY MORNING, EXCEPT FOR COASTAL SLOPES SHROUDED IN FOG BELOW 3500
FEET MSL 10-15Z FRIDAY. WEST-SOUTHWEST WINDS 25-35 KTS GUSTS TO 45
KTS THROUGH MOUNTAIN PASSES AND LOCALLY INTO DESERTS CURRENTLY.
OCCASIONAL MOD UP/DOWNDRAFTS IN LEE OF MOUNTAINS. WINDS SLOWLY
WEAKEN 06-12Z. WEST-SOUTHEST WINDS RETURN SLIGHTLY STRONGER FRIDAY
AFTERNOON. WIDESPREAD GUSTS 25-35 KTS WITH GUSTS 35-50 KTS ALONG
DESERT SLOPES AND THROUGH PASSES (LOCALLY HIGHER THROUGH THE BANNING
PASS).
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH TUESDAY.
BEACHES
A LONG-PERIOD SOUTH SWELL WILL CONTINUE TO BRING SURF OF 3 TO 6 FEET
THROUGH THIS EVENING WITH THE HIGHEST SURF ON SOUTH FACING BEACHES.
SEE THE BEACH HAZARDS STATEMENT FOR DETAILS.
FIRE WEATHER
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...BEACH HAZARDS STATEMENT UNTIL 10 PM PDT THIS EVENING FOR ORANGE
COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.
WIND ADVISORY FROM 11 AM FRIDAY TO 5 AM PDT SUNDAY FOR APPLE AND
LUCERNE VALLEYS.
EXTREME HEAT WARNING UNTIL 8 PM PDT THIS EVENING FOR SAN DIEGO
COUNTY DESERTS.
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...CO
AVIATION/MARINE...KW
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