530
FXUS66 KSGX 161055
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
355 AM PDT FRI MAY 16 2025
SYNOPSIS
LITTLE CHANGE IN TEMPERATURES FOR TODAY. COOLER, CLOUDIER, AND
WINDIER WITH CHANCES OF PRECIPITATION ALONG AND WEST OF THE
MOUNTAINS OVER THE WEEKEND. MUCH WARMER WITH A SHALLOWER MARINE
LAYER EXPECTED NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SUNDAY)
NOT MUCH CHANGE FROM THURSDAY FOR TODAY. THE MARINE LAYER IS
STILL NEAR 2000 TO 2500 FEET DEEP WITH SATELLITE IMAGERY SHOWING
WIDESPREAD LOW CLOUDS OVER THE COASTAL WATERS EXTENDING INLAND
INTO THE WESTERN VALLEYS. NOT MUCH CHANGE IN HIGH TEMPERATURES IS
EXPECTED FOR THE COAST AND VALLEYS WITH THE DESERTS A FEW DEGREES
WARMER.
A LOW PRESSURE SYSTEM FROM THE NORTHWEST WILL MOVE INTO CALIFORNIA
ON SATURDAY AND BEGIN TO MOVE EAST ON SUNDAY. IT WILL BE COOLER ON
SATURDAY, AS MUCH AS 8 TO 12 DEGREES COOLER FOR MOUNTAINS, INLAND
VALLEYS, AND HIGH DESERT. HIGH TEMPERATURES ON SATURDAY WILL RANGE
FROM THE LOWER 60S NEAR THE COAST TO THE MID 60S TO AROUND 70 FOR
THE INLAND EMPIRE WITH THE LOWER DESERTS IN THE MID 80S TO LOWER
90S. IT WILL BEGIN TO WARM ON SUNDAY WITH HIGH TEMPERATURES
RANGING FROM THE LOWER TO MID 60S NEAR THE COAST TO THE UPPER 60S
TO MID 70S FOR THE INLAND EMPIRE WITH THE LOWER DESERTS STILL IN
THE MID 80S TO LOWER 90S.
THERE WILL BE STRONGER AND GUSTY SOUTHWEST TO WEST WINDS FOR THE
DESERTS ONTO THE DESERT SLOPES OF THE MOUNTAINS FOR SATURDAY
AFTERNOON INTO SATURDAY NIGHT WITH THE STRONGER GUSTS TO 50 TO 60
MPH WITH ISOLATED GUSTS TO 70 MPH IN THE NORTHERN COACHELLA VALLEY
BELOW THE SAN GORGONIO PASS. GUSTY WEST WINDS FOR SUNDAY
AFTERNOON AND EVENING WILL NOT BE QUITE AS STRONG WITH GUSTS TO 45
TO 55 MPH AND ISOLATED GUSTS TO 65 MPH.
THE MARINE LAYER WILL DEEPEN TO AROUND 4000 TO 4500 FEET BY EARLY
SATURDAY AND 5500 FEET BY EARLY SUNDAY WITH LOW CLOUDS EXTENDING
WELL INLAND AND ONTO THE COASTAL SLOPES OF THE MOUNTAINS. THERE
ARE CHANCES FOR LIGHT PRECIPITATION FROM LATE TONIGHT INTO EARLY
SUNDAY WITH THE MOST LIKELY TIME FOR MORE AREAS TO RECEIVE LIGHT
PRECIPITATION ON SATURDAY EVENING. CHANCES FOR ONE-TENTH INCH OR
MORE OF RAINFALL ALONG THE COASTAL SLOPES OF THE MOUNTAINS IS
AROUND 10 PERCENT.
LONG TERM (MONDAY THROUGH THURSDAY)
HIGH PRESSURE WILL BRING DRY WEATHER WITH WARMING FROM MONDAY
THROUGH WEDNESDAY AND THURSDAY. HIGH TEMPERATURES ON THURSDAY WILL
BE AROUND 10 DEGREES ABOVE AVERAGE, RANGING FROM THE LOWER TO MID
70S NEAR THE COAST TO THE 90S FOR THE INLAND EMPIRE WITH 104 TO
109 FOR THE LOWER DESERTS. FOR WEDNESDAY AND THURSDAY, NBM
CHANCES FOR HIGH TEMPERATURES IN THE WARMER PORTIONS OF THE INLAND
EMPIRE TO EXCEED 100 ARE AROUND 35 TO 45 PERCENT WITH NBM CHANCES
FOR THE WARMER PORTIONS OF THE LOWER DESERTS TO EXCEED 110 ON
THURSDAY AT 5 TO 10 PERCENT. THE MARINE LAYER WILL BECOME
SHALLOWER WITH NIGHT AND MORNING COASTAL LOW CLOUDS NOT EXTENDING
INLAND PAST THE FAR WESTERN VALLEYS FOR WEDNESDAY AND THURSDAY.
AVIATION
160930Z...COAST/VALLEYS...LOW CLOUDS BASED 1200-1500 FEET MSL WILL
CONTINUE TO INFILTRATE INTO WESTERN VALLEYS THROUGH 14Z. LOCAL VIS
REDUCED TO 3-5SM ON HIGHER COASTAL TERRAIN AND VALLEYS. SCATTER OUT
SHOULD BE 16-18Z, BUT WITH PATCHY CLOUDS LINGERING ALONG THE COAST.
LOW CLOUDS WITH SLIGHTLY HIGHER BASES 1500-2000 FEET MSL WILL PUSH
ASHORE AND INLAND AFTER 00Z, FILLING THE ENTIRE COASTAL BASIN TO
THE FOOTHILLS BY EARLY SATURDAY.
MOUNTAINS/DESERTS...SCT HIGH CLOUDS LATE TODAY AND TONIGHT. AFTER
22Z, POCKETS OF WESTERLY SURFACE WINDS INCREASE TO 25-30 KNOTS WITH
GUSTS TO 40 KNOTS THROUGH MOUNTAIN PASSES INTO ADJACENT DESERTS.
THIS COULD PRODUCE INTERMITTENT STRONG UP/DOWNDRAFTS IN THE LEE OF
MOUNTAINS SUCH AS VCNTY KPSP.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY
MORNING. STRONGER WINDS LATE SATURDAY INTO EARLY SUNDAY COULD LEAD
TO CHOPPY SEAS AND HAZARDOUS BOATING CONDITIONS IN THE OUTER WATERS
NEAR SAN CLEMENTE ISLAND FOR SATURDAY EVENING.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...WIND ADVISORY FROM NOON SATURDAY TO 2 AM PDT SUNDAY FOR APPLE
AND LUCERNE VALLEYS-RIVERSIDE COUNTY MOUNTAINS-SAN
BERNARDINO COUNTY MOUNTAINS-SAN DIEGO COUNTY DESERTS-SAN
DIEGO COUNTY MOUNTAINS-SAN GORGONIO PASS NEAR BANNING.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE...MM
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