219
FXUS66 KSGX 232039
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
139 PM PDT WED APR 23 2025
SYNOPSIS
A COOLING TREND THROUGH SATURDAY, WITH HIGH TEMPERATURES 10 TO 15
DEGREES BELOW AVERAGE FOR INLAND AREAS TO AS MUCH AS 20 DEGREES
BELOW AVERAGE FOR THE HIGHER ELEVATIONS OF THE MOUNTAINS BY THE
WEEKEND. THE MARINE LAYER WILL DEEPEN WITH NIGHT AND MORNING
COASTAL LOW CLOUDS AND FOG EXTENDING ONTO THE LOWER COASTAL SLOPES
OF THE MOUNTAINS FOR TODAY AND THURSDAY, THEN FARTHER ONTO THE
COASTAL MOUNTAIN SLOPES FOR FRIDAY AND SATURDAY. THERE WILL BE
STRONGER ONSHORE FLOW WITH GUSTY SOUTHWEST TO WEST WINDS FOR THE
MOUNTAINS AND DESERTS EACH LATE AFTERNOON AND EVENING THROUGH
SATURDAY. THERE IS ALSO A SLIGHT CHANCE FOR MOSTLY LIGHT SHOWERS
FOR LATE FRIDAY NIGHT INTO SATURDAY EVENING. THEN DRY WITH A
WARMING TREND FOR SUNDAY THROUGH TUESDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SATELLITE SHOWS THAT EXTENSIVE CLOUD COVER REMAINS WITH SLOW
CLEARING FROM SOUTH TO NORTH. PARTS OF RIVERSIDE AND ORANGE COUNTIES
WILL STRUGGLE TO CLEAR TODAY, BUT CLOUDS SHOULD RETREAT TO THE COAST
BY THE LATE AFTERNOON. SUNNY SKIES AND INCREASING WINDS OUT OF THE
WEST OVER THE NEXT SEVERAL HOURS, CALMING LATER TONGIHT. HEIGHTS
FALL THROUGH SATURDAY AS A TROUGH OFF THE COAST OF CANADA BECOMES A
CUTOFF LOW AND MOVES SOUTHWARD INTO CALIFORNIA. WITH THE FALLING
HEIGHTS, THE MARINE LAYER DEEPENS THE NEXT FEW MORNINGS, MAKING IT
FURTHER INLAND EACH DAY AND ALLOWING MORNING DRIZZLE TO OCCUR,
ESPECIALLY FOR THE COASTAL AREAS AND VALLEYS. TEMPERATURES ALSO
RESPOND, WITH HIGHS FALLING SUBSTANTIALLY BY FRIDAY AND SATURDAY,
GENERALLY 5-20 DEGREES BELOW NORMAL FOR THE END OF APRIL. GUSTY WEST
WINDS DEVELOP EACH AFTERNOON AND EVENING AS THE GRADIENT TIGHTENS
THIS WEEK, WITH GUSTS UP TO 40 MPH IN THE DESERTS AND MOUNTAINS AND
LOCALIZED AREAS OF GUSTS UP TO 55 MPH THROUGH THE MOUNTAIN PASSES,
PEAKING BOTH FRIDAY AND SATURDAY AFTERNOONS. SOME AREAS OF BLOWING
DUST WILL BE POSSIBLE, ESPECIALLY IN THE DESERTS.
THE LATEST MODEL RUNS HAVE SLOWED THE PROGRESSION OF THE
AFOREMENTIONED LOW AND BROUGHT IT A SMIDGE FURTHER SOUTH ON
SATURDAY, INDICATING SLIGHTLY HIGHER PRECIPITATION CHANCES THAN
PREVIOUS RUNS, NOW AROUND 20-25% FOR THE MOUNTAINS. WHILE POPS
HAVE INCREASED, QPF UNFORTUNATELY REMAINS FAIRLY LOW WITH LIMITED
MOISTURE AND ENERGY TO TAP IN TO. RIGHT NOW THE BEST CHANCES FOR
ACCUMULATING RAINFALL WILL BE FOR THE AREAS FURTHER NORTH,
ESPECIALLY THE HIGHER TERRAIN, WHERE UP TO 0.10-0.15" IS POSSIBLE
THROUGH SATURDAY NIGHT.
AS THE LOW MOVES UP INTO NEVADA ON SUNDAY, HIGHS WARM A FEW DEGREES
BUT WILL REMAIN WELL BELOW NORMAL. BY MONDAY, WEAK UPPER LEVEL
RIDGING STARTS TO BUILD IN, WITH TEMPERATURES QUICKLY WARMING
THROUGH MID WEEK AND HIGHS RETURN TO NEAR OR SLIGHTLY ABOVE NORMAL
BY TUESDAY.
AVIATION
232030Z....COASTS/VALLEYS/COASTAL MOUNTAIN SLOPES...SLOW CLEARING WILL
CONTINUE THIS AFTERNOON FOR PARTS OF ORANGE COUNTY AND THE INLAND EMPIRE
WITH BASES NEAR 3,000 FT MSL. CLOUDS SPREAD WILL BACK ASHORE AFTER 00-03Z
THURSDAY WITH SIMILAR BASES AND INLAND EXTENT. CLOUDS CLEARING AGAIN 16-19Z
FRIDAY, THOUGH LOCALLY BKN NEAR THE COAST.
OTHERWISE...MOSTLY CLEAR THROUGH WEDNESDAY.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SUNDAY.
BEACHES
ELEVATED SURF OF 4 TO 6 FEET WITH SETS TO 7 FEET POSSIBLE FROM SATURDAY THROUGH
MONDAY WITH STRONG RIP CURRENTS EXPECTED.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...ZUBER
AVIATION/MARINE/BEACHES...APR
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