817
FXUS66 KSGX 010754
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1254 AM PDT MON JUN 1 2026
SYNOPSIS
SLOW WARMING WILL CONTINUE FOR THE INLAND AREAS THROUGH MID WEEK
WITH HIGH TEMPERATURES AROUND 4 TO 8 DEGREES ABOVE AVERAGE FOR
WEDNESDAY AND THURSDAY. THE COAST AND VALLEYS WILL COOL A FEW
DEGREES ON TUESDAY, THEN WARM A FEW DEGREES FOR WEDNESDAY AND
THURSDAY WITH NIGHT AND MORNING COASTAL LOW CLOUDS SPREADING INTO
PORTIONS OF THE VALLEYS LATE EACH NIGHT. A LOW PRESSURE SYSTEM
MOVING INTO THE WESTERN STATES WILL BRING A COOLING TREND FOR
FRIDAY THROUGH NEXT WEEKEND WITH HIGH TEMPERATURES FOR NEXT SUNDAY
FALLING TO A FEW DEGREES BELOW AVERAGE TO AROUND 5 DEGREES BELOW
AVERAGE FOR THE VALLEYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH WEDNESDAY)
NOT MUCH CHANGE IN HIGH TEMPERATURES IS EXPECTED FOR TODAY WITH
HIGH TEMPERATURES A FEW DEGREES ABOVE AVERAGE. HIGH TEMPERATURES
FOR TODAY WILL RANGE FROM THE MID TO UPPER 60S NEAR THE COAST TO
THE 80S FOR THE INLAND EMPIRE WITH 100 TO 104 FOR THE LOWER
DESERTS.
DEEPENING OF THE MARINE LAYER WILL BRING A FEW DEGREES OF
COOLING FOR THE COAST AND VALLEYS ON TUESDAY WITH MOST AREAS A FEW
TO AROUND 5 DEGREES WARMER ON WEDNESDAY. WEDNESDAY HIGH
TEMPERATURES WILL BE A FEW DEGREES ABOVE AVERAGE FOR THE COAST
AND VALLEYS WITH THE DESERTS AND LOWER ELEVATIONS OF THE MOUNTAINS
5 TO LOCALLY 10 DEGREES ABOVE AVERAGE. HIGH TEMPERATURES ON
WEDNESDAY WILL RANGE FROM THE LOWER 70S NEAR THE COAST TO THE MID
80S TO LOWER 90S FOR THE INLAND EMPIRE WITH 102 TO 106 FOR THE
LOWER DESERTS.
A MARINE LAYER NEAR 2000 FEET DEEP EARLY THIS MORNING WILL DEEPEN
TO AROUND 2500 FEET FOR LATE TONIGHT INTO TUESDAY MORNING, THEN
BEGIN TO DECREASE FOR TUESDAY NIGHT INTO WEDNESDAY MORNING. NIGHT
AND MORNING COASTAL LOW CLOUDS WILL SPREAD INTO THE WESTERN
VALLEYS FOR EARLY THIS MORNING, INTO PORTIONS OF THE INLAND
VALLEYS FOR LATE TONIGHT INTO TUESDAY MORNING, THEN INTO THE
WESTERN VALLEYS FOR LATE TUESDAY NIGHT INTO WEDNESDAY MORNING.
LONG TERM (THURSDAY THROUGH SUNDAY)
FOR FRIDAY THROUGH SUNDAY, A LOW PRESSURE SYSTEM WILL MOVE TOWARD
AND SLOWLY INLAND INTO THE WESTERN STATES BRING STRONGER ONSHORE
FLOW, DEEPENING OF THE MARINE LAYER, AND COOLING FOR SOUTHERN
CALIFORNIA.
NOT MUCH CHANGE IS EXPECTED ON THURSDAY, FOLLOWED BY A GRADUAL
COOLING TREND FOR FRIDAY THROUGH SUNDAY. HIGH TEMPERATURES ON
THURSDAY OF A FEW DEGREES ABOVE AVERAGE FOR COASTAL AREAS TO 4 TO
8 DEGREES ABOVE AVERAGE FOR INLAND AREAS WILL COOL ON SUNDAY TO A
FEW DEGREES BELOW AVERAGE TO AROUND 5 DEGREES BELOW AVERAGE FOR
THE VALLEYS. HIGH TEMPERATURES FOR NEXT SUNDAY WILL RANGE FROM THE
AROUND 70 NEAR THE COAST TO THE UPPER 70S TO MID 80S FOR THE
INLAND EMPIRE WITH THE UPPER 90S FOR THE LOWER DESERTS.
NIGHT AND MORNING COASTAL LOW CLOUDS WILL SPREAD INTO THE WESTERN
VALLEYS FOR EARLY THURSDAY, INTO PORTIONS OF THE INLAND VALLEYS
FOR EARLY FRIDAY, AND ACROSS MUCH OF THE VALLEYS FOR EARLY
SATURDAY AND EARLY SUNDAY.
AVIATION
010500Z...COAST/VALLEYS...LOW CLOUDS DEVELOPING ALONG THE COAST AND
SPREADING ABOUT 2-3 MILES INLAND AT THIS HOUR. LOW CLOUDS WILL
INCREASE IN COVERAGE AND SPREAD ABOUT 5 MILES INLAND SD COUNTY BY
ABOUT 7Z-9Z, SPREADING INTO ORANGE COUNTY 7Z-12Z. LOW CLOUDS
COULD REACH 10-15 MILES INLAND BY 14Z. BASES ARE 1100-1300 FT MSL
BUT COULD LOWER TO 800-1000 FT MSL AT TIMES 10Z-14Z. PERIODS OF
IFR CIGS POSSIBLE AT COASTAL TAF SITES. VIS 4-6SM FOR AREAS ABOVE
300 FT MSL AND 0-4SM ABOVE 700 FT MSL. LOW CLOUDS SCATTER OUT
15-18Z. ANOTHER ROUND OF LOW CLOUDS DEVELOPS FOR MONDAY EVENING,
LIKELY PUSHING INLAND BY 02-04Z TUE WITH SIMILAR BASES.
MOUNTAINS/DESERTS...FEW CLOUDS AT OR ABV 10,000FT MSL MONDAY
AFTERNOON OVER MOUNTAIN PEAKS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH FRIDAY.
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...PG
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