164
FXUS66 KSGX 060521
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1021 PM PDT FRI JUN 5 2026
SYNOPSIS
COOLER WEATHER FOR INLAND AREAS IS EXPECTED THIS WEEKEND INTO THE
FIRST HALF OF NEXT WEEK AS A TROUGH OF LOW PRESSURE MOVES OVER THE
REGION. THIS WILL ALSO BRING BREEZY CONDITIONS ACROSS THE
MOUNTAINS AND DESERTS THIS AFTERNOON THROUGH SATURDAY EVENING.
HIGH PRESSURE LOOKS TO EXPAND OVER THE WEST COAST BY THE LATTER
HALF OF NEXT WEEK, WHICH WOULD LEAD TO A WARMING TREND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
UPDATED AVIATION AND MARINE DISCUSSION
ZOOMING OUT, WE SEE A 591 MB HIGH TO OUR SOUTHWEST OVER THE EAST
PAC AND 540 MB LOW OFF THE COAST OF BRITISH COLUMBIA. THE HIGH'S
INFLUENCE HAS LED TO A SHALLOWER INVERSION, LEADING TO SOME HAZY
CONDITIONS IN THE WESTERN VALLEYS AND CLOUDS STICKING CLOSER TO
THE COAST. CLOUDS WILL STRUGGLE TO CLEAR AT THE BEACHES, BUT MAY
DO SO INTERMITTENTLY LATER THIS AFTERNOON. HEIGHTS LOWER AS THE
AREA OF LOW PRESSURE TO THE NORTH MOVES CLOSER TO OUR REGION OVER
THE WEEKEND. THIS WILL LEAD TO INCREASED WINDS OVER THE MOUNTAINS
AND DESERTS STARTING LATER THIS AFTERNOON THROUGH SATURDAY. WINDS
WILL MOSTLY BE NEAR 25-40 MPH WITH HIGHEST WINDS IN THE SAN
GORGONIO PASS LOCALLY OVER 50 MPH, SO PLEASE BE SURE TO DRIVE WITH
CARE. COOLER WEATHER WILL ALSO OCCUR INLAND OVER THE WEEKEND WITH
SUNDAY BEING THE COOLEST DAY OVERALL. HIGHS IN THE 70S AND 80S
WILL OCCUR ACROSS MOST AREAS WITH HIGHS 95-100 DEGREES ACROSS THE
LOWER DESERTS.
THE TROUGH WILL REMAIN IN PLACE INTO EARLY NEXT WEEK, WITH MINIMAL
CHANGES IN THE WEATHER FROM DAY TO DAY. MARINE LAYER CLOUDS WILL
WORK THEIR WAY INTO MOST AREAS WEST OF THE MOUNTAINS EACH NIGHT
AND MORNING INTO THE MIDDLE OF NEXT WEEK. CLUSTER ANALYSIS SHOWS
FAIR AGREEMENT ON A RIDGE OFF THE COAST STRENGTHENING BY THE
LATTER HALF OF NEXT WEEK. THIS WILL LEAD TO A WARMING TREND WITH
LESS WIND AND A DEEPER MARINE LAYER, BUT HOW WARM WE BECOME IS
STILL SOMETHING TO BE DETERMINED AS THE TIMING AND STRENGTH OF THE
DEPARTING TROUGH MAY TRY TO INFLUENCE OUR WEATHER PATTERN AS
WELL.
AVIATION
060530Z...COAST/VALLEYS...LOW CLOUDS BASED 1400-1800 FT MSL HAVE
SETTLED IN OVER COASTAL AREAS THIS EVENING. CLOUDS WILL PUSH INLAND
OVERNIGHT FILLING SAN DIEGO/ORANGE COUNTY VALLEYS AND REACHING INTO
PORTIONS OF THE INLAND EMPIRE. VIS 4-6 SM FOR INLAND EDGE OF CLOUDS
IN VALLEYS/INLAND EMPIRE (I.E. KRNM, KSBD). CLOUDS WILL CLEAR FROM
INLAND AREAS 16-19Z SAT, BUT WILL STRUGGLE TO CLEAR AT ALL WITHIN 5-
10 MILES OF THE COASTLINE SATURDAY AFTERNOON. CLOUDS MOVE INLAND
AGAIN STARTING AROUND 00-02Z SUN WITH BASES 2000-2500 FT MSL.
MOUNTAINS/DESERTS...VFR WITH INCREASING CLOUDS AOA 20000FT MSL
TONIGHT INTO SATURDAY. SOUTHWEST-WEST WINDS WILL INCREASE IN THE
MOUNTAINS AND DESERTS WITH GUSTS REACHING 30-40 KNOTS AFTER 18Z SAT.
WINDS SLOWLY DECREASE LATE SATURDAY EVENING AND OVERNIGHT. MOD
UP/DOWNDRAFTS AND POCKETS OF LLWS IN LEE (NORTH AND EAST) OF
MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH WEDNESDAY.
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...PG
AVIATION/MARINE...KW
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