446
FXUS66 KSGX 010418
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
918 PM PDT MON JUN 30 2025
SYNOPSIS
A FEW DEGREES OF COOLING IS EXPECTED FOR ALL AREAS TUESDAY, WITH
ADDITIONAL MINOR COOLING EACH DAY THROUGH THURSDAY. A GRADUAL
WARMING IS EXPECTED FRIDAY THROUGH THE WEEKEND. NIGHT AND MORNING
LOW CLOUDS AND FOG ARE EXPECTED TO REMAIN PERSISTENT ALONG THE
COAST AND INTO THE WESTERN VALLEYS THROUGH THE WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS EVENING, THE MARINE LAYER REMAINS AT A CONSISTENT DEPTH AND LOW
CLOUDS ARE DEVELOPING ALONG THE COAST OF SAN DIEGO COUNTY. THE
CLOUDS AND SOME PATCHY FOG WILL SPREAD INLAND AND NORTHWARD INTO
ORANGE COUNTY AND COULD REACH UP TO 15 MILES INLAND BY SUNRISE.
FROM PREVIOUS DISCUSSION...
AN UPPER LEVEL LOW OFF THE COAST OF CALIFORNIA NEARLY DUE WEST OF
PT. CONCEPTION WILL PROPAGATE SOUTHEAST TOMORROW THROUGH THURSDAY.
IT WILL PULL SOME MID TO UPPER LEVEL MOISTURE FROM THE TROPICS INTO
SOUTHERN CALIFORNIA MAINLY TUESDAY AND WEDNESDAY. THIS WILL
RESULT IN AREAS OF HIGH CLOUD COVERAGE ACROSS THE AREA AND THE
DEVELOPMENT OF CUMULUS CLOUDS OVER THE MOUNTAINS. THERE IS A 10
PERCENT OR LESS CHANCE THAT ANY SHOWERS OR THUNDERSTORMS DEVELOP.
ONLY A FEW MEMBERS OF BOTH THE ECMWF AND GFS ENSEMBLES SHOW LIGHT
PRECIPIATION IN THE MOUNTAINS. HIGH RESOLUTION MODELS ARE SHOWING
AN ISOLATED LIGHT RAIN SHOWER OR TWO IN THE SAN BERNARDINO
MOUNTAINS AND NORTHEAST INTO PORTIONS OF THE HIGH DESERT TUESDAY
AND WEDNESDAY. CONFIDENCE IS NOT CURRENTLY HIGH ENOUGH TO OFFICIALLY
INTRODUCE A SLIGHT CHANCE OF SHOWERS INTO THE FORECAST.
FOR THE 4TH OF JULY HOLIDAY THROUGH THE WEEKEND, TEMPERATURES WILL
REMAIN WITHIN A FEW DEGREES OF AVERAGE WITH DRY CONDITIONS
PREVAILING. MARINE LAYER LOW CLOUD AND FOG COVERAGE WILL REMAIN
PERSISTENT EACH NIGHT AND MORNING INTO EARLY NEXT WEEK WITH MINOR
VARIATIONS IN DEPTH AND COVERAGE.
AVIATION
010345Z....COAST/VALLEYS...STRATUS WITH BASES 1000-1500 FT MSL
FILLING IN ALONG THE COAST THROUGH 07Z, THEN SPREADING 10-15 MI
INLAND BY 11Z. LOCAL VIS 3-5 SM WHERE STRATUS NEARS TERRAIN IN THE
VALLEYS. CLOUDS AND VIS RESTRICTIONS CLEARING INLAND 14-16Z AND
ALONG THE COAST 16-18Z, THOUGH THERE IS A 50-60% CHANCE OF BKN-OVC
CIGS AT THE SAN DIEGO COUNTY BEACHES THROUGH THE AFTERNOON. CLOUDS
SPREADING BACK INTO THE COASTAL AREAS AFTER 02/03Z WITH SIMILAR
BASES. OTHERWISE AREAS OF FU/HZ NEAR ONGOING WILDFIRES IN THE INLAND
EMPIRE.
MOUNTAINS/DESERTS
WEST WINDS GUSTING 25-35 KT THROUGH THE PASSES
AND ON THE DESERT MOUNTAIN SLOPES TUESDAY AFTERNOON AND EVENING WITH
ASSOCIATED MOD UDDFS OVER AND EAST OF THE MOUNTAINS.
MARINE
NO HAZARDOUS MARINE WEATHER CONDITIONS ARE EXPECTED THROUGH
SATURDAY.
BEACHES
BUILDING SOUTHERLY SWELL (190 DEGREES) OF 3 FEET AT 14-15 SECONDS
WILL GENERATE ELEVATED SURF OF 3-5 FT WITH SETS TO 6 FT ALONG
SOUTHERLY FACING BEACHES AND STRONG RIP AND LONGSHORE CURRENTS AT
ALL BEACHES FRIDAY AND SATURDAY. SWELL AND SURF WILL BEGIN TO LOWER
ON SUNDAY.
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/BEACHES...SS
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