928
FXUS66 KSGX 072141
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
141 PM 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...
CLEAR SKIES ARE PREVAILING ACROSS THE AREA THIS AFTERNOON. 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 WILL 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,
FOOTHILLS, AND BELOW PASSES. THE STRONGEST WINDS ARE EXPECTED ON
TUESDAY WITH GUSTS 25 TO 45 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 10
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
072100Z...CLEAR SKIES AND VFR PREVAIL REGION-WIDE. AFTER 01Z THIS
EVENING, 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. VFR ONCE AGAIN MONDAY AFTERNOON.
MARINE
TONIGHT, 20-30% CHANCE OF PATCHY DENSE FOG WITH VISIBILITY 1
NAUTICAL MILE OR LESS THROUGH EARLY MONDAY BEFORE SUNRISE.
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...WESTERINK
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page