954
FXUS66 KSGX 110921
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
221 AM PDT THU SEP 11 2025
SYNOPSIS
THERE WILL BE A GRADUAL WARMING TREND THROUGH THE MIDDLE OF NEXT
WEEK WITH HIGH TEMPERATURES NEAR THE COAST WARMING FROM THE LOWER
70S TODAY TO THE MID TO UPPER 70S FOR NEXT WEDNESDAY, FOR THE
INLAND EMPIRE WARMING FROM THE UPPER 70S TO MID 80S TODAY TO THE
90S FOR NEXT WEDNESDAY, AND FOR THE LOWER DESERTS WARMING FROM
THE LOWER TO MID 90S TODAY TO THE UPPER 90S TO 104 FOR NEXT
WEDNESDAY. THE MARINE LAYER WILL BECOME SHALLOWER WITH COASTAL LOW
CLOUDS COVERING MUCH OF THE COAST AND VALLEYS EARLY THIS MORNING,
THEN ONLY REACHING THE FAR WESTERN VALLEYS AT TIMES FOR NEXT
WEEK. SOME MONSOONAL MOISTURE MAY RETURN FOR THE MIDDLE AND LATTER
PART OF NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SATURDAY)
A LOW PRESSURE SYSTEM WILL CONTINUE TO MOVE SLOWLY INLAND
THROUGH THE WESTERN STATES THROUGH FRIDAY AND INTO THE ROCKIES ON
SATURDAY WITH HIGH PRESSURE ALOFT MOVING TO NEAR THE WEST COAST ON
SATURDAY.
HIGH TEMPERATURES TODAY WILL WARM A FEW DEGREES FOR THE MOUNTAINS
AND INLAND VALLEYS WITH NOT MUCH CHANGE ON FRIDAY. THERE WILL BE
ADDITIONAL WARMING ON SATURDAY OF AS MUCH AS 5 DEGREES FOR THE
MOUNTAINS, HIGH DESERT, AND INLAND VALLEYS WITH SATURDAY HIGH
TEMPERATURES RANGING FROM THE LOWER 70S NEAR THE COAST TO THE 80S
FOR THE INLAND EMPIRE WITH THE MID TO UPPER 90S FOR THE LOWER
DESERTS.
A MARINE LAYER NEAR 3000 FEET DEEP WILL GRADUALLY DECREASE IN
DEPTH FOR FRIDAY AND SATURDAY. COASTAL LOW CLOUDS WILL EXTEND
INLAND ACROSS MOST OF THE COAST AND VALLEYS EARLY THIS MORNING,
THEN INTO PORTIONS OF THE INLAND VALLEYS FOR LATE TONIGHT INTO
FRIDAY MORNING, AND INTO THE WESTERN VALLEYS FOR LATE FRIDAY
NIGHT INTO SATURDAY MORNING.
LONG TERM (SUNDAY THROUGH WEDNESDAY)
A LOW PRESSURE SYSTEM WILL MOVE INLAND THROUGH THE PACIFIC
NORTHWEST ON SUNDAY WITH ONLY SLIGHT WARMING FOR SOUTHERN
CALIFORNIA ON SUNDAY WITH CONTINUED SLOW WARMING FOR MONDAY
THROUGH WEDNESDAY. HIGH TEMPERATURES WILL WARM FROM A FEW TO
AROUND 5 DEGREES BELOW AVERAGE ON SUNDAY TO AROUND 5 DEGREES ABOVE
AVERAGE FOR THE COAST AND VALLEYS ON WEDNESDAY. WEDNESDAY HIGH
TEMPERATURES WILL RANGE FROM THE MID TO UPPER 70S NEAR THE COAST
TO THE 90S FOR THE INLAND EMPIRE WITH THE UPPER 90S TO 104 FOR THE
LOWER DESERTS.
THE MARINE LAYER WILL BECOME A LITTLE SHALLOWER WITH NIGHT AND
MORNING COASTAL LOW CLOUDS EXTENDING INLAND INTO THE FAR WESTERN
VALLEYS AT TIMES LATE EACH NIGHT. SOME MONSOONAL MOISTURE MAY
RETURN FOR THE LATTER HALF OF NEXT WEEK WITH NBM DAILY CHANCES FOR
MEASURABLE RAINFALL FOR BIG BEAR INCREASING TO 10 PERCENT ON
WEDNESDAY, 19 PERCENT ON THURSDAY, AND 25 PERCENT ON FRIDAY.
AVIATION
110930Z...COAST/VALLEYS...LOW CLOUDS WITH VARYING BASES 2000-3000
FEET MSL AND TOPS TO 3500 FEET WILL CONTINUE TO COVER MOST OF THE
COASTAL BASIN, BUT MORE LIKELY SCT CLOUDS NEAR THE COAST. CLEARING
WILL BE RANDOM AND INTERMITTENT THIS MORNING, WITH NEARLY ALL OF THE
COASTAL BASIN SCATTERED OUT BY 19Z. LOW CLOUDS WILL BEGIN TO REFORM
IN WESTERN SAN DIEGO COUNTY AROUND 23-01Z, AND THEN FILL INTO ORANGE
COUNTY AND THE INLAND AREAS AFTER 04Z. FULL CLOUD COVERAGE OF THE
COASTAL BASIN NOT EXPECTED, WITH BASES 1800-2500 FEET MSL
TONIGHT INTO EARLY FRIDAY.
MOUNTAINS/DESERTS...VFR CONDITIONS PREVAIL TODAY AND TONIGHT.
WESTERLY WINDS OF 25-30 MPH WITH GUSTS UP TO 40 MPH 21-08Z TODAY AND
TONIGHT THROUGH MOUNTAIN PASSES INTO ADJACENT DESERTS, CAUSING
ISOLATED POCKETS OF LLWS AND UP/DOWNDRAFTS IN LEE OF MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH MONDAY.
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...17
AVIATION/MARINE...MM
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