572
FXUS66 KSGX 071726
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
926 AM PST SUN DEC 7 2025
SYNOPSIS
WARM AND DRY CONDITIONS WITH PERIODS OF SANTA ANA WINDS EXPECTED
THIS WEEK. THE PEAK OF THE HEAT IS EXPECTED TO BE MID-WEEK. PATCHY
LOW CLOUDS COULD DEVELOP OVERNIGHT INTO MONDAY MORNING NEAR THE
COAST.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
MOSTLY CLEAR SKIES ARE BEING OBSERVED ACROSS THE AREA AS OF 9 AM. A
FEW PATCHES OF LOW CLOUDS DEVELOPED OFF THE COAST OVERNIGHT, BUT
WEAK EASTERLY WINDS AND A PREVAILING OFFSHORE PRESSURE GRADIENT KEPT
THE CLOUDS OFFSHORE. FOR TONIGHT INTO MONDAY MORNING THERE IS A 10
TO 20 PERCENT CHANCE OF PATCHY LOW CLOUDS AND DENSE FOG DEVELOPING
ALONG THE COAST, WITH SLIGHTLY HIGHER CHANCES OF DENSE FOG
DEVELOPING OVER THE COASTAL WATERS. MOSTLY CLEAR SKIES WILL PREVAIL
FROM MONDAY AFTERNOON THROUGH THE MIDDLE OF THE WEEK DUE TO PERIODS
OF WEAK TO MODERATE SANTA ANA WINDS.
A PERSISTENT SURFACE HIGH PRESSURE OVER THE GREAT BASIN IS PREDICTED
TO REMAIN IN PLACE THROUGH SATURDAY. THIS WILL BRING WEAK TO LOCALLY
MODERATE SANTA ANA WINDS TO THE AREA. WITH NO UPPER LEVEL SUPPORT,
THE STRONGEST WINDS WILL REMAIN CONFINED TO COASTAL MOUNTAIN SLOPES
AND BELOW PASSES. THE STRONGEST WINDS ARE EXPECTED ON TUESDAY WITH
GUSTS 25 TO 40 MPH. A SECONDARY PEAK IN WINDS IS EXPECTED ON FRIDAY.
THE AIRMASS GETTING PUSHED INTO SOUTHERN CALIFORNIA FROM THE GREAT
BASIN WILL BE ON THE DRIER SIDE, WITH MINIMUM AFTERNOON RELATIVE
HUMIDITY FOR INLAND AREAS FALLING TO 12 TO 20% EACH AFTERNOON
THROUGH FRIDAY, BRINGING PERIODS OF ELEVATED FIRE WEATHER
CONDITIONS.
AN UPPER LEVEL RIDGE OVER THE EAST PACIFIC WILL STRENGTHEN OVER THE
US WEST COAST THROUGH TUESDAY, BRINGING AN UPTICK IN HIGH
TEMPERATURES. HIGH TEMPERATURES ON TUESDAY WILL BE 15 TO 20 DEGREES
ABOVE AVERAGE. WIDESPREAD HIGHS IN THE LOW TO MID 80S ARE FORECAST
ACROSS THE INLAND COASTAL AREAS INTO THE VALLEYS AS WELL AS THE LOW
DESERTS. WEAKER SANTA ANA WINDS AND A WEAKENING IN THE UPPER LEVEL
RIDGE WILL ALLOW FOR MINOR COOLING ON WEDNESDAY AND THURSDAY MAINLY
FOR COASTAL AREAS. THE SECONDARY UPTICK IN SANTA ANA WINDS ON FRIDAY
IS EXPECTED TO BRING ADDITIONAL WARMING TO AREAS WEST OF THE
MOUNTAINS WITH HIGH TEMPERATURES EXPECTED TO RUN UP TO 20 DEGREES
ABOVE AVERAGE FOR INLAND AREAS. NIGHTS AND MORNINGS WILL REMAIN
COOL, ESPECIALLY IN THE WIND-SHELTERED AREAS, MINIMIZING ANY HEAT
IMPACTS. A FEW DEGREES OF COOLING IS EXPECTED INTO NEXT WEEKEND AS
WEAK ONSHORE FLOW RETURNS, BUT TEMPERATURES WILL CONTINUE TO RUN
ABOVE AVERAGE.
AVIATION
071630Z...CLEAR SKIES AND VFR PREVAIL REGION-WIDE THROUGH THIS
AFTERNOON. SOME HZ CURRENTLY NEAR THE SURFACE. AFTER 01Z MON, 10-20%
CHANCE FOR VERY PATCHY FOG DEVELOPING WITHIN 5 MILES OF THE COAST
WITH VERY PATCHY VIS REDUCTIONS. OFFSHORE E/NE WINDS GUSTING 25-35
KTS TO PICK UP THROUGH MOUNTAIN PASSES AND SANTA ANA MOUNTAIN
COASTAL SLOPES AFTER 13Z MON, CLEARING OUT ANY LEFTOVER FOG.
MARINE
TONIGHT, 20-30% CHANCE OF PATCHY DENSE FOG WITH VISIBILITY 1
NAUTICAL MILE OR LESS THROUGH EARLY MONDAY BEFORE SUNRISE.
BEACHES
MORNING HIGH TIDE IS PREDICTED TO BE 6.5 TO 7 FT AT 10 AM THIS
MORNING IN LA JOLLA AND AT 9:50 AM IN NEWPORT BEACH. ASTRONOMICALLY
HIGH TIDES MAY RESULT IN TIDAL OVERFLOW IN NORMALLY DRY BEACH AREAS.
HIGH TIDE IS PREDICTED TO FALL BELOW 6 FT BY MONDAY.
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...WESTERINK
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