523
FXUS66 KSGX 272156
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
156 PM PST SAT DEC 27 2025
SYNOPSIS
AREAS OF CUMULUS CLOUDS ALONG AND WEST OF THE COASTAL MOUNTAIN
SLOPES THIS AFTERNOON WILL CLEAR OVERNIGHT. A DRYING PATTERN WILL
DEVELOP FOR SUNDAY THROUGH TUESDAY, WITH PERIODS OF WEAK TO
MODERATE STRENGTH GUSTY SANTA ANA WINDS. SLIGHT WARMING WILL
ACCOMPANY THE OFFSHORE FLOW FOR MONDAY AND TUESDAY. A LOW PRESSURE
SYSTEM FROM THE SOUTHWEST COULD BRING A RETURN OF PRECIPITATION
FOR WEDNESDAY THROUGH NEXT SATURDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS AFTERNOON...AREAS OF LOW CLOUDS FORMED ALONG THE COASTAL MTN
SLOPES, AND IN THE COASTAL AREAS AND VALLEYS. THE CLOUDS WILL
LIKELY CLEAR TONIGHT SO TEMPERATURES COULD FALL INTO THE 30S IN
PARTS OF THE INLAND VALLEYS EARLY SUNDAY MORNING
DRY AND WARMER CONDITIONS ARE EXPECTED FOR SUNDAY THROUGH TUESDAY
AS HIGH PRESSURE BUILDS OVER THE WEST COAST AND A POSITIVELY-
TILTED TROUGH EXTENDS TO THE SOUTHWEST OVER SOCAL WITH A CLOSED
UPPER LOW FORMING TO OUR SOUTHWEST. OFFSHORE FLOW DEVELOPS ON
SUNDAY AND PERSISTS THROUGH TUESDAY AS A SFC HIGH MOVES INTO THE
GREAT BASIN. THE OFFSHORE FLOW GETS SOME UPPER LEVEL SUPPORT ON
MON AND TUE WITH NORTHEAST WINDS ALOFT. THE OFFSHORE FLOW WILL
LIKELY BE STRONGEST ON TUESDAY, PRODUCING GUSTY SANTA ANA WINDS IN
THE MTNS AND LOWER ELEVATIONS WEST OF THE MTNS. NORTHEAST TO EAST
WINDS GUSTING 35-45 MPH WILL BE POSSIBLE IN THE FAVORED LOCATIONS.
TUESDAY WILL ALSO BE THE WARMEST DAY, WITH HIGH TEMPS IN THE 70S
WEST OF THE MTNS AND MOST AREAS SEEING TEMPS NEAR OR ABOVE
SEASONAL AVERAGES. COASTAL AND VALLEY AREAS COULD BE AS MUCH AS 7
DEGREES ABOVE AVERAGE WHILE THE MTNS AND DESERTS WILL BE NEAR OR
JUST A FEW DEGREES ABOVE.
CHANCES FOR RAIN AND MOUNTAIN SNOW WILL RETURN FOR WED THROUGH
NEXT SAT AS A LOW PRESSURE SYSTEM MOVES IN FROM THE GULF OF
ALASKA, CAUSING THE CLOSED LOW TO OUR SOUTHWEST TO BECOME AN OPEN
WAVE AS IT IS DRAWN INTO THE MEAN WESTERLY FLOW OVER THE SOUTHWEST
US. FORECAST DETAILS ARE STILL UNCERTAIN DUE TO DIFFERENCES IN
MODEL SOLUTIONS BUT IT'S LIKELY THAT WE WILL SEE PERIODS OF
SHOWERS BETWEEN WED AND NEXT SAT. THE TIMING IS ALSO IN QUESTION
BUT PRELIMINARY ESTIMATES ARE FOR TOTALS OF 1"-1.5" IN THE
COASTAL AREAS AND VALLEYS, 1"-3" IN THE MTNS, 0.3"-0.6" IN THE
HIGH DESERTS AND 0.15"-0.30" IN THE LOW DESERTS. THE SNOW LEVEL
WILL REMAIN ABOVE 8,000 FT THROUGH FRIDAY BEFORE LOWERING TO
AROUND 6,500 FT ON SAT.
AVIATION
271630Z...VFR CONDITION ARE EXPECTED THROUGH THE TAF PERIOD WITH
SOME LINGERING 3000-5000FT MSL CLOUDS ACROSS SAN DIEGO COUNTY INTO
TONIGHT. OFFSHORE WINDS WILL PICK UP AFTER 15Z SUNDAY, WITH GUSTS UP
TO 25-30KTS FOR THE COASTAL SLOPES OF THE MOUNTAINS AND INTO THE
VALLEYS. HIGHER GUSTS THROUGH MOUNTAIN PASSES WITH MOD UP/DOWNDRAFTS
NEAR MOUNTAIN PEAKS. STRONG WINDS PREVAIL INTO MONDAY.
MARINE
NO HAZARDOUS MARINE WEATHER EXPECTED THROUGH FRIDAY.
BEACHES
HIGH SURF CONDITIONS ARE SUBSIDING AND WILL CONTINUE TO DO SO.
THEREFORE, THE HIGH SURF ADVISORY HAS BEEN CANCELLED.
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...PG
AVIATION/MARINE/BEACHES...VILLAFANE
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