569
FXUS66 KSGX 200950
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
250 AM PDT MON JUL 20 2026
SYNOPSIS
HIGH TEMPERATURES FOR INLAND AREAS WILL COOL A FEW DEGREES TODAY
WITH HIGH TEMPERATURES A FEW DEGREES BELOW AVERAGE FOR THE
MOUNTAINS AND INLAND VALLEYS. THIS WILL BE FOLLOWED BY A WARMING
TREND WITH HIGH TEMPERATURES WARMING TO 4 TO 8 DEGREES ABOVE
AVERAGE ON THURSDAY FOLLOWED BY SLIGHT DAY-TO-DAY DIFFERENCES.
FOR THURSDAY THROUGH NEXT WEEKEND, THERE WILL BE WIDESPREAD
MODERATE OR GREATER HEATRISK EXCEPT NEAR THE COAST AND FOR THE
HIGHER ELEVATIONS IN THE MOUNTAINS WITH WIDESPREAD MAJOR HEATRISK
FOR THE LOWER DESERTS. AN INCREASE IN MONSOONAL MOISTURE LATE IN
THE WEEK COULD BRING A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS,
MAINLY FOR THE MOUNTAINS AND CENTERED AROUND FRIDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH WEDNESDAY)
HIGH TEMPERATURES WILL COOL A FEW DEGREES TODAY WITH HIGH
TEMPERATURES FOR THE MOUNTAINS AND INLAND VALLEYS A FEW DEGREES
BELOW AVERAGE. HIGH TEMPERATURES WILL RANGE FROM THE MID TO UPPER
70S NEAR THE COAST TO THE 90S FOR THE INLAND EMPIRE WITH 106 TO
110 FOR THE LOWER DESERTS. INLAND AREAS WILL THEN WARM A FEW
DEGREES FOR TUESDAY AND WEDNESDAY WITH WEDNESDAY HIGH TEMPERATURES
MOSTLY A FEW TO AROUND 5 DEGREES ABOVE AVERAGE. HIGH TEMPERATURES
FOR WEDNESDAY WILL RANGE FROM THE MID 70S TO AROUND 80 NEAR THE
COAST TO THE 90S TO 102 FOR THE INLAND EMPIRE WITH 108 TO 112 FOR
THE LOWER DESERTS.
THERE WILL BE SLIGHT DRYING OF MONSOONAL MOISTURE EARLY THIS WEEK
WITH FEWER AFTERNOON CLOUDS OVER THE MOUNTAINS. NIGHT AND MORNING
COASTAL LOW CLOUDS WILL SPREAD INTO PORTIONS OF THE FAR WESTERN
VALLEYS LATE EACH NIGHT.
LONG TERM (THURSDAY THROUGH SUNDAY)
THERE WILL BE ADDITIONAL WARMING OF HIGH TEMPERATURES ON THURSDAY
FOLLOWED BY SLIGHT DAY-TO-DAY CHANGES THROUGH NEXT WEEKEND. HIGH
TEMPERATURES ON THURSDAY WILL BE MOSTLY 4 TO 8 DEGREES ABOVE
AVERAGE RANGING FROM THE MID 70S TO LOWER 80S NEAR THE COAST TO
THE MID 90S TO 108 FOR THE INLAND EMPIRE WITH 110 TO 114 FOR THE
LOWER DESERTS. FOR THURSDAY THROUGH NEXT WEEKEND, THERE WILL BE
WIDESPREAD MODERATE OR GREATER HEATRISK EXCEPT NEAR THE COAST AND
FOR THE HIGHER ELEVATIONS IN THE MOUNTAINS WITH WIDESPREAD MAJOR
HEATRISK FOR THE LOWER DESERTS.
AN INCREASE IN MONSOONAL MOISTURE LATE IN THE WEEK COULD BRING A
SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS, MAINLY FOR THE MOUNTAINS
AND CENTERED AROUND FRIDAY.
AVIATION
200900Z....COAST/VALLEYS...PATCHY LOW CLOUDS BASED 1100-1500 FT MSL
ARE COVERING UP TO 15 MILES INLAND IN SD COUNTY. VIS 0-5SM ALONG
ELEVATED TERRAIN. LOW CLOUD COVERAGE IS VERY PATCHY AND INTERMITTENT
THROUGHOUT ORANGE COUNTY, AND IS EXPECTED TO REMAIN SO THROUGHOUT
THE EARLY MORNING. LOW CLOUDS SCATTER OUT 15-17Z MON, WITH FEW-SCT
MID-HIGH LEVEL CLOUDS REMAINING THROUGH THE EVENING. LOW CLOUDS WITH
SLIGHTLY LOWER BASES REDEVELOP ALONG THE SD COUNTY COAST IN THE
EVENING, REACHING A FEW MILES INLAND AFTER 07Z TUE, THOUGH REMAINING
VERY PATCHY THROUGHOUT THE NIGHT.
MOUNTAINS/DESERTS...FEW-SCT CLOUDS GENERALLY AOA 15,000FT MSL. WEST
WINDS GUSTING 20-35 KTS ALONG DESERT SLOPES AND UP TO 45 KTS THROUGH
THE BANNING PASS EXPECTED FROM 00-09Z TUE.
MARINE
THERE IS A ~70% CHANCE FOR NW WIND GUSTS TO EXCEED 20 KTS IN THE
OUTER WATERS NEAR SAN CLEMENTE ISLAND WEDNESDAY AFTERNOON, AND A 60%
CHANCE THURSDAY AFTERNOON. ADDITIONALLY, A MIXED SWELL WILL CAUSE
STEEP AND CHOPPY SEAS DURING THE DAY THURSDAY, ESPECIALLY IN THE
OUTER WATERS.
BEACHES
SOUTHERLY SWELL OF 4-5 FT WITH A PERIOD OF 11-13 SECONDS WILL
CONTINUE TO BRING ELEVATED TO HIGH SURF AND STRONG RIP AND LONGSHORE
CURRENTS THROUGH TUESDAY. SURF 4-7 FEET WITH SETS TO 8 FEET IS
EXPECTED THROUGH TUESDAY, WITH THE HIGHEST SURF FOCUSED ON SOUTH AND
SOUTHWEST FACING BEACHES OF ORANGE COUNTY. A HIGH SURF ADVISORY
REMAINS IN EFFECT UNTIL 11 PM TUESDAY.
THE SOUTHERLY SWELL AND SURF FALLS THROUGH THE DAY ON TUESDAY,
REMAINING LOW INTO WEDNESDAY. ANOTHER ROUND OF ELEVATED SOUTHERLY
SWELL FROM A TROPICAL CYCLONE WELL OFF THE COAST IS EXPECTED LATER
THIS WEEK. THIS SWELL IS EXPECTED TO BE AROUND 4-5 FT WITH A PERIOD
OF ABOUT 15 SECONDS WHICH WOULD ONCE AGAIN BRING HIGH SURF OF 6-8
FEET, ESPECIALLY FOR SOUTH-SOUTHWEST FACING BEACHES.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...HIGH SURF ADVISORY UNTIL 11 PM PDT TUESDAY FOR ORANGE COUNTY
COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE/BEACHES...WESTERINK
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