602
FXUS66 KSGX 201000
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
300 AM PDT TUE MAY 20 2025
SYNOPSIS
WARMING WILL CONTINUE THROUGH WEDNESDAY WITH HIGH TEMPERATURES ON
WEDNESDAY 10 TO 15 DEGREES ABOVE AVERAGE. COOLING WILL BEGIN TO
SPREAD INLAND ON THURSDAY AND CONTINUE THROUGH SATURDAY WITH
SATURDAY HIGH TEMPERATURES WITHIN A FEW DEGREES OF AVERAGE.
SLIGHTLY WARMER ON SUNDAY FOLLOWED BY MINOR DAY TO DAY DIFFERENCES
THROUGH THE MIDDLE OF NEXT WEEK. THROUGH WEDNESDAY, NIGHT AND
MORNING LOW CLOUDS WILL BE PATCHIER WITH INLAND SPREAD LIMITED TO
COASTAL AREAS. THE MARINE LAYER WILL THEN DEEPEN INTO THE WEEKEND
WITH NIGHT AND MORNING COASTAL LOW CLOUDS SPREADING INTO PORTIONS
OF THE INLAND VALLEYS WITH MORE LIMITED OR SLOWER AFTERNOON
CLEARING NEAR THE COAST.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH THURSDAY)
THE WARMING TREND WILL CONTINUE THROUGH WEDNESDAY WITH WEDNESDAY
HIGH TEMPERATURES AROUND 10 TO 15 DEGREES ABOVE AVERAGE FOR THE
COAST AND VALLEYS AND AROUND 10 DEGREES ABOVE AVERAGE FOR THE
LOWER DESERTS. HIGH TEMPERATURES ON WEDNESDAY WILL RANGE FROM
THE LOWER TO MID 70S NEAR THE COAST TO THE 90S FOR THE INLAND
EMPIRE WITH 102 TO 107 FOR THE LOWER DESERTS. COOLING WILL BEGIN
TO SPREAD INLAND ON THURSDAY WITH THE COAST, VALLEYS, AND
MOUNTAINS A FEW DEGREES COOLER THAN WEDNESDAY.
THE SOUNDING FROM NKX FROM LATE MONDAY AFTERNOON SHOWED A PAIR OF
MARINE INVERSIONS, ONE NEAR 2000 FEET AND A SECOND, LOWER
INVERSION NEAR 1400 FEET. SATELLITE IMAGERY SHOWS PATCHY LOW
CLOUDS MOVING NORTHWARD JUST OFF THE COAST OF ORANGE AND SAN DIEGO
COUNTIES. THE LOW CLOUDS AND FOG MAY EXTEND LOCALLY INLAND INTO
COASTAL AREAS EARLY THIS MORNING. SIMILAR COVERAGE IS EXPECTED FOR
LATE TONIGHT INTO EARLY WEDNESDAY MORNING WITH INCREASING LOW
CLOUD COVERAGE AND SLIGHT DEEPENING OF THE MARINE LAYER FOR
WEDNESDAY NIGHT INTO THURSDAY MORNING.
LONG TERM (FRIDAY THROUGH MONDAY)
THE COOLING WILL CONTINUE TO SPREAD INLAND THROUGH SATURDAY WITH
SATURDAY HIGH TEMPERATURES WITH A FEW DEGREES OF AVERAGE. SATURDAY
HIGH TEMPERATURES WILL RANGE FROM THE MID TO UPPER 60S NEAR THE
COAST TO THE UPPER 70S TO MID 80S FOR THE INLAND EMPIRE WITH THE
MID 90S TO AROUND 100 FOR THE LOWER DESERTS. THE MARINE LAYER WILL
DEEPEN TO AROUND 2500 FEET FOR THE WEEKEND. NIGHT AND MORNING
COASTAL LOW CLOUDS WILL SPREAD INLAND INTO PORTIONS OF THE INLAND
VALLEYS WITH SLOWER OR MORE LIMITED AFTERNOON CLEARING NEAR THE
COAST. SUNDAY MAY WARM SLIGHTLY FOLLOWED BY MINOR DAY TO DAY
DIFFERENCES THROUGH THE MIDDLE OF NEXT WEEK. NIGHT AND MORNING
COASTAL LOW CLOUDS WILL CONTINUE TO SPREAD INTO PORTIONS OF THE
VALLEYS LATE EACH NIGHT.
AVIATION
200900Z...COASTS...SATELLITE SHOWS ONLY A FEW PATCHY LOW CLOUDS WITH
BASES 800-1300FT MSL ALONG THE ORANGE COUNTY COAST. LOW CLOUDS WILL
CONTINUE TO DEVELOP AND SPREAD SOUTHWARD THROUGH 12Z WITH BASES
LOWERING SLIGHTLY, BUT REMAIN EXTREMELY PATCHY. COASTAL TAF SITES
MAY SEE BRIEF CIGS, MOSTLY LIKELY TO OCCUR AFTER 11Z WITH COMPLETE
CLEARING BY 15Z. BRIEF VIS RESTRICTIONS POSSIBLE DOWN TO 4-5SM.
PATCHY LOW CLOUDS REDEVELOP AGAIN TONIGHT WITH LOWER BASES, CLOSER
TO 500-800FT MSL AND MORE VIS RESTRICTIONS, LIKELY DOWN TO 2-5SM FOR
COASTAL MESAS AFTER 07Z.
ELSEWHERE...CLEAR WITH UNRESTRICTED VIS THROUGH TUESDAY.
MARINE
GUSTS MAY APPROACH 20KTS IN THE OUTER COASTAL WATERS NEAR SAN
CLEMENTE ISLAND FRIDAY AFTERNOON AND EVENING. OTHERWISE, NO
HAZARDOUS MARINE CONDITIONS EXPECTED THROUGH 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...17
AVIATION/MARINE...ZUBER
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