507
FXUS66 KSGX 302039
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
139 PM PDT MON JUN 30 2025
SYNOPSIS
HOT CONDITIONS WILL CONTINUE TODAY, ESPECIALLY FOR THE DESERTS. 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...
MOSTLY CLEAR SKIES WILL PREVAIL ACROSS THE REGION THIS AFTERNOON.
TEMPERATURES AT THE COAST AS OF 1 PM ARE RUNNING SIMILAR TO A DEGREE
OR TWO WARMER THAN 1 PM YESTERDAY, WITH TEMPERATURES UP TO 5 DEGREES
COOLER THAN YESTERDAY FOR THE VALLEYS. TEMPERATURES IN THE DESERTS
ARE RUNNING ABOUT THE SAME TO UP TO 4 DEGREES WARMER THAN YESTERDAY.
MOSTLY MODERATE HEATRISK COVERAGE THIS AFTERNOON ACROSS THE DESERTS,
WITH LOCAL AREAS OF MAJOR HEATRISK EXPECTED. IT IS RECOMMENDED TO BE
EXTRA CAUTIOUS IF PLANNING TO BE OUTDOORS, AND BE SURE TO STAY
HYDRATED TO AVOID ANY HEAT-RELATED ILLNESSES.
AN UPPER LEVEL LOW OFF THE COAST OF CALIFORNIA NEARLY DUE WEST OF
PT. CONCEPTION WILL PROPAGATE SOUTHEAST TOMORROW THROUGH THURSDAY.
THAT WILL PULL SOME MID TO UPPER LEVEL MOISTURE 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 AT THIS TIME 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.
AVIATION
302030Z....COAST/VALLEYS...MOSTLY CLEAR SKIES WITH VFR CONDITIONS
PREVAILING THROUGH THIS EVENING/TONIGHT. AS WITH THE LAST FEW
EVENINGS, LOW CLOUDS WILL BE SLUGGISH TO REFORM AND BECOME UNIFORM
IN COVERAGE, WITH CIGS EXPECTED FOR THE COASTAL TAF SITES BY 05-08Z
TUESDAY MORNING. SIMILAR BASES EXPECTED TONIGHT, LIKELY 900-1400FT
MSL. CIGS LARGELY MVFR FOR KSAN/KSNA (70% CHANCE FOR NO IFR CIGS,
BUT MORE LIKELY BELOW 1000FT AGL (80% CHANCE) FOR KCRQ. INLAND
EXTENT WILL ALSO BE SIMILAR TO THIS MORNING, WITH CLOUDS EXTENDING
ABOUT 15 MILES INLAND WITH THE IE REMAINING MOSTLY SKC. RAPID
CLEARING TUESDAY MORNING BY 16-17Z.
MOUNTAINS/DESERTS
FU/HZ POSSIBLE THROUGH THE BANNING PASS AND
INTO THE NORTHERN COACHELLA VALLEY DUE TO WOLF FIRE NEAR BANNING.
SW/W WIND GUSTS 25-35 KTS CONTINUE FOR THE DESERTS AND MOUNTAIN
PASSES THIS AFTERNOON, LEADING TO PERIODS OF MOD UDDFS IN THE LEE OF
MOUNTAINS/MOUNTAIN PASSES. WINDS GRADUALLY RELAX SOME LATE THIS
EVENING BUT REMAIN ELEVATED IN THE WIND PRONE AREAS LIKE IN THE LEE
OF BANNING PASS. OTHERWISE, VFR CONDITIONS PREVAIL THROUGH TUESDAY
MORNING.
MARINE
AFTERNOON WINDS NEAR 10 KNOTS WITH GUSTS 15-20 KNOTS NEAR SAN
CLEMENTE ISLAND EACH AFTERNOON TODAY THROUGH WEDNESDAY. OTHERWISE,
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY.
BEACHES
BUILDING SOUTHERLY SWELL (190 DEGREES) FRIDAY OF ABOUT 3 FEET AT 14-
15 SECONDS COULD BRING SETS OF BREAKING WAVES TO 6 FEET ALONG
SOUTHERLY FACING BEACHES. THIS LONG PERIOD ELEVATED SWELL LIKELY
CONTINUES INTO THE WEEKEND.
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...CO
AVIATION/MARINE/BEACHES...MUNYAN
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