933
FXUS66 KSGX 011031
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
231 AM PST MON DEC 1 2025
SYNOPSIS
LOW CLOUDS AND PATCHY FOG EXTENDING INTO THE INLAND VALLEYS THIS
MORNING. WEAK TO LOCALLY MODERATE SANTA ANA WINDS DEVELOP LATER
THIS MORNING AND WEAKEN TUESDAY FOR WARMER AND DRIER WEATHER WITH
FAR LESS MARINE LAYER CLOUD COVERAGE. CHANCES INCREASE FOR
ANOTHER ROUND OF WEAK TO MODERATE SANTA ANA WINDS LATE WEDNESDAY
INTO FRIDAY, PEAKING THURSDAY. GRADUAL WARMING THURSDAY INTO NEXT
WEEKEND WITH HIGHS NEAR SEASONAL NORMALS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
MORNING WATER VAPOR IMAGERY SHOWS THE UPPER LEVEL TROUGH
CONTINUING TO PROGRESS SOUTHEAST ACROSS THE DESERT SOUTHWEST,
WITH THE TROUGH AXIS NOW MOVING OVER SO CAL. SURFACE PRESSURE
GRADIENTS HAVE TURNED OFFSHORE TO THE LOCAL DESERTS, CURRENTLY
AROUND -1.5 MB LAX-DAG. WIDESPREAD LOW CLOUDS AND FOG CONTINUE
ACROSS THE COASTAL AREAS AND VALLEYS, BUT THESE CLOUDS SHOULD
GRADUALLY CLEAR TO THE COAST LATER THIS MORNING AS SANTA ANA
WINDS STRENGTHEN.
NORTHEAST TO EAST WINDS ARE FORECAST TO PEAK LATE THIS MORNING
INTO THE AFTERNOON WITH GUSTS 30-45 MPH BELOW THE PASSES, CANYONS,
AND NEAR THE FOOTHILLS, WITH ISOLATED GUSTS TO 50 MPH NEAR THE
BASE OF THE CAJON PASS. VERY WEAK RIDGING BEHIND THE DEPARTING
TROUGH AND DOWNSLOPING WINDS WILL LEAD TO WARMING WEST OF THE
MOUNTAINS, WHERE HIGHS WILL BE NEAR TO AROUND 3 DEGREES ABOVE
NORMAL, BUT COOLING ACROSS THE MOUNTAINS AND DESERTS AS COOLER AIR
MOVES IN FROM THE NORTH. SANTA ANA WINDS WEAKEN TONIGHT, TURNING
BACK ONSHORE BY TUESDAY MORNING. THIS WILL LIKELY ALLOW MARINE
LAYER LOW CLOUDS AND FOG TO RETURN TO THE COASTAL AREAS TONIGHT.
WITH THE RETURN OF ONSHORE FLOW AND A TROUGH BEGINNING TO DROP
DOWN FROM THE NORTH, TUESDAY WILL BE SLIGHTLY COOLER WITH HIGH
TEMPERATURES NEAR TO SLIGHTLY BELOW NORMAL.
MUCH LIKE THE SYSTEM TODAY, ENSEMBLES HAVE COMPLETELY TRENDED
TOWARDS AN INSIDE SLIDER TRACK WITH THE NEXT TROUGH WEDNESDAY TO
THURSDAY. WHILE SOME ENSEMBLE MEMBERS ARE STILL SHOWING VERY LIGHT
PRECIPITATION, IT WOULD BE MORE IN THE FORM OF DRIZZLE FROM A
DEEPENING MARINE LAYER WEDNESDAY MORNING. RAIN/MOUNTAIN SNOW HAVE
BEEN REMOVED FROM THE FORECAST WITH CHANCES OF MEASURABLE
PRECIPITATION NOW LESS THAN 10%. DISAPPOINTING BUT NOT SURPRISING.
ONSHORE FLOW WILL STRENGTHEN AHEAD OF THE TROUGH TUESDAY, THEN AS
IT PASSES IN AN ALMOST IDENTICAL TRACK AS THIS MORNING, ANOTHER
ROUND OF GUSTY SANTA ANA WINDS DEVELOPS BEHIND IT ON WEDNESDAY.
WINDS ARE FORECAST TO PEAK ON THURSDAY WHEN THERE IS AROUND A 30%
CHANCE OF A WEAK TO MODERATE EVENT. OFFSHORE FLOW WILL LIKELY
CONTINUE INTO AT LEAST SATURDAY MORNING, GRADUALLY WEAKENING EACH
DAY. UPPER LEVEL RIDGING SLOWLY BUILDS IN FROM THE WEST ALONG WITH
THE OFFSHORE FLOW FOR GRADUAL WARMING AND DRYING ALONG WITH MOSTLY
CLEAR SKIES FOR THURSDAY INTO EARLY NEXT WEEK WITH HIGHS WARMING
TO AS MUCH AS 5-10 DEGREES ABOVE NORMAL BY MONDAY.
AVIATION
011030Z....COASTS/VALLEYS...AREAS OF LOW CLOUDS IN WESTERN VALLEYS
AND COAST BASED 1800-2400 FEET MSL WITH INLAND VIS 1-5SM WILL
PREVAIL THROUGH 16Z, BUT IN SOMEWHAT RANDOM AND VARIABLE FASHION.
PATCHY LOW CLOUDS BASED AROUND 1200-1800 FEET MSL WILL DEVELOP IN
COASTAL AREAS AFTER 06Z INTO TUESDAY. OFFSHORE NORTHEAST WINDS 20-30
KTS WITH LOCALLY HIGHER GUSTS WILL CONTINUE IN FOOTHILLS THIS
MORNING AND SPREAD INTO PARTS OF INLAND VALLEYS AFTER 17Z. THESE
WILL CONTINUE THROUGH THE AFTERNOON, DIMINISHING AFTER 02Z.
OTHERWISE, MOSTLY CLEAR AND VFR CONDITIONS WILL PREVAIL TODAY AND
TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH FRIDAY.
TUESDAY. OFFSHORE NORTHEAST WINDS 20-30 KTS WITH LOCALLY HIGHER
GUSTS WILL CONTINUE IN FOOTHILLS THIS MORNING AND SPREAD INTO
PARTS OF INLAND VALLEYS AFTER 17Z. THESE WILL CONTINUE THROUGH THE
AFTERNOON, DIMINISHING AFTER 02Z. OTHERWISE, MOSTLY CLEAR AND VFR
CONDITIONS WILL PREVAIL TODAY AND TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED TODAY THROUGH FRIDAY.
BEACHES
VERY HIGH TIDES ARE FORECAST DURING THE MORNINGS WEDNESDAY THROUGH
SATURDAY THIS WEEK, THREATENING MINOR TIDAL OVERFLOW AND BEACH
EROSION. CHANCES OF THESE IMPACTS ARE HIGHER WEDNESDAY AND THURSDAY
MORNINGS AS ELEVATED SURF COMBINES WITH THE HIGH TIDES.
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...SS
AVIATION/MARINE/BEACHES...MM
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