418
FXUS66 KSGX 311129
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
429 AM PDT MON MAR 31 2025
SYNOPSIS
COOLER THAN AVERAGE WEATHER WILL CONTINUE THROUGH THURSDAY. THERE
WILL BE STRONGER ONSHORE FLOW THROUGH TUESDAY NIGHT WITH AREAS OF
SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND DESERTS WITH THE
STRONGER GUSTS TO 45 TO 55 MPH WITH ISOLATED GUSTS TO 70 MPH.
LIGHT RAINFALL IS EXPECTED INTO THIS EVENING FROM THE COAST TO THE
MOUNTAINS WITH ADDITIONAL CHANCES FOR MOSTLY LIGHT PRECIPITATION
FOR TUESDAY NIGHT INTO WEDNESDAY MORNING AND AROUND THURSDAY. THEN
DRIER WITH WARMING FOR FRIDAY INTO EARLY NEXT WEEK WITH HIGH
TEMPERATURES WARMING TO AROUND AVERAGE FOR THE COAST AND VALLEYS
ON SATURDAY AND FOR THE MOUNTAINS AND DESERTS ON MONDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH WEDNESDAY)
A LOW PRESSURE SYSTEM MOVING INLAND THROUGH THE PACIFIC NORTHWEST
TODAY AND INTO THE NORTHERN ROCKIES ON TUESDAY WILL BRING STRONGER
ONSHORE FLOW TO SOUTHERN CALIFORNIA. COOLER THAN AVERAGE HIGH
TEMPERATURES WILL CONTINUE THROUGH WEDNESDAY, AS MUCH AS 8 TO 12
DEGREES BELOW AVERAGE FOR THE MOUNTAINS AND VALLEYS TODAY AND AS
MUCH AS 12 TO 18 DEGREES BELOW AVERAGE FOR THE MOUNTAINS ON
TUESDAY.
THERE WILL BE PERIODS OF STRONGER AND GUSTY SOUTHWEST TO WEST
WINDS FOR THE MOUNTAINS AND DESERTS THROUGH TONIGHT WITH THE
STRONGER GUSTS TO 55 TO 65 MPH AND ISOLATED GUSTS TO 70 MPH. GUSTY
SOUTHWEST TO WEST WINDS WILL CONTINUE FOR THE MOUNTAINS AND
DESERTS FOR TUESDAY MORNING INTO TUESDAY NIGHT WITH THE STRONGER
GUSTS TO 45 TO 55 MPH WITH ISOLATED GUSTS TO 70 MPH. STRONGER
WEST TO NORTHWEST WINDS ACROSS THE COASTAL WATERS WILL SPREAD
INLAND INTO THE COAST AND VALLEYS DURING TUESDAY AFTERNOON WITH
GUSTS TO 35 TO 40 MPH NEAR THE ORANGE COUNTY COAST AND TO 30 TO 40
MPH FOR THE INLAND EMPIRE. THOSE WINDS WILL DIMINISH TUESDAY
EVENING.
LIGHT RAIN WILL SPREAD INLAND FROM THE COASTAL WATERS TO THE
MOUNTAINS THIS MORNING, THEN GRADUALLY END DURING THE EVENING.
RAINFALL IS EXPECTED TO RANGE FROM AROUND ONE-TENTH INCH NEAR THE
COAST TO ONE-QUARTER TO ONE-HALF INCH IN THE MOUNTAINS WITH
LOCALLY GREATER AMOUNTS. THROUGH 4 AM, RAINFALL HAS MOSTLY BEEN A
FEW HUNDREDTHS OF AN INCH OR LESS NEAR THE COAST TO AS MUCH AS
0.10 TO 0.15 INCH ON SOME OF THE COASTAL MOUNTAIN SLOPES. THERE
IS A 20 TO 30 PERCENT CHANCE FOR MEASURABLE PRECIPITATION FOR
TUESDAY NIGHT INTO WEDNESDAY MORNING.
LONG TERM (THURSDAY THROUGH SUNDAY)
A LOW PRESSURE SYSTEM MOVING SOUTHWARD ALONG THE WEST COAST COULD
BRING SOME ADDITIONAL PRECIPITATION AROUND THURSDAY. NBM CHANCES
FOR MEASURABLE PRECIPITATION ARE AROUND 25 TO 35 PERCENT WITH A
LESS THAN 10 PERCENT CHANCE FOR ONE-HALF INCH OR MORE OF RAINFALL
FOR TYPICALLY WETTER LOCATIONS ON THE COASTAL SLOPES OF THE
MOUNTAINS.
THEN DRIER WITH WARMING FOR FRIDAY INTO EARLY NEXT WEEK WITH HIGH
TEMPERATURES FOR THE COAST AND VALLEYS WARMING TO AROUND AVERAGE
ON SATURDAY AND FOR THE MOUNTAINS AND DESERTS WARMING TO AROUND
AVERAGE ON MONDAY.
AVIATION
310930Z...COAST/VALLEYS/FOOTHILLS...LOW CLOUDS WITH -SHRA AND CIGS
1500-2500 FEET MSL, LOCALLY DOWN TO 500 FEET WITH VIS 2SM IN -RA
WILL CONTINUE GENERALLY ALL DAY. THE VFR CONDITIONS WILL BE NEAR
KSNA AND KONT THIS MORNING, MOVING THROUGH KCRQ AND KSAN THIS
AFTERNOON AND EVENING. TOPS WILL BE TO 6000 FEET MSL AND MUCH
TERRAIN WILL BE OBSCURED MUCH OF THE TIME. CONDITIONS IMPROVE 00-06Z
AND OVERNIGHT INTO TUESDAY FROM NORTHWEST TO SOUTHEAST, WITH BASES
LIFTING TO 1500-2500 FEET MSL, VIS MOSTLY P6SM, AND ONLY PATCHY
TERRAIN OBSCURED.
HIGHER MOUNTAINS/DESERTS...SCT-BKN CLOUDS AOA 15000 FEET MSL TODAY
AND TONIGHT. STRONG WESTERLY WINDS CONTINUE TODAY. GUSTS 30-50 KTS
OVER THE RIDGES AND IN WIND-PRONE MOUNTAIN PASSES, WITH GUSTS 25-35
KTS WITHIN THE OPEN DESERTS. AREAS OF MODERATE UP/DOWNDRAFTS,
INCLUDING LOCALIZED LLWS AND ROTORS, IN LEE OF MOUNTAINS AND
MOUNTAIN PASSES.
MARINE
WINDS WILL INCREASE AND SEAS WILL BUILD TONIGHT, PEAKING WITH
PROBABLE GALES TUESDAY AND TUESDAY NIGHT, BEFORE DECREASING SOME,
BUT STILL PROBABLY HAZARDOUS ON WEDNESDAY. WINDS AND SEAS WILL BE
HAZARDOUS DURING THIS PERIOD. A SMALL CRAFT ADVISORY IS IN EFFECT
TONIGHT THROUGH TUESDAY AFTERNOON AHEAD OF THE GALE WATCH FOR
TUESDAY AFTERNOON THROUGH WEDNESDAY MORNING. CHECK THOSE BULLETINS
FOR DETAILS. NO ADDITIONAL HAZARDOUS MARINE CONDITIONS ARE EXPECTED
THURSDAY AND FRIDAY.
BEACHES
ELEVATED SURF WILL ARRIVE TUESDAY, PEAK EARLY WEDNESDAY, AND
GRADUALLY DIMINISH THEREAFTER. SURF OF 3-6 FEET IS EXPECTED, WITH
LOCAL SETS TO 7 FEET, TUESDAY AFTERNOON THROUGH WEDNESDAY MORNING.
THIS WILL PRODUCE A HIGH RIP CURRENT RISK AND LOCALLY DANGEROUS
SWIMMING CONDITIONS.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...WIND ADVISORY UNTIL 2 AM PDT WEDNESDAY FOR APPLE AND LUCERNE
VALLEYS-COACHELLA VALLEY-RIVERSIDE COUNTY MOUNTAINS-SAN
BERNARDINO COUNTY MOUNTAINS-SAN DIEGO COUNTY DESERTS-SAN
DIEGO COUNTY MOUNTAINS-SAN GORGONIO PASS NEAR BANNING.
PZ...SMALL CRAFT ADVISORY FROM 2 AM TO 3 PM PDT TUESDAY FOR COASTAL
WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER AND OUT
TO 10 NM.
GALE WATCH FROM TUESDAY AFTERNOON THROUGH WEDNESDAY MORNING FOR
COASTAL WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER
AND OUT TO 10 NM-WATERS FROM SAN MATEO POINT TO THE MEXICAN
BORDER EXTENDING 10 TO 60 NM OUT INCLUDING SAN CLEMENTE
ISLAND.
SMALL CRAFT ADVISORY FROM 10 PM THIS EVENING TO 3 PM PDT TUESDAY
FOR WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER
EXTENDING 10 TO 60 NM OUT INCLUDING SAN CLEMENTE ISLAND.
PUBLIC...17
AVIATION/MARINE/BEACHES...MM
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