781
FXUS66 KSGX 311133
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
433 AM PDT MON AUG 31 2026
SYNOPSIS
THERE WILL BE COOLING AND DRYING FOR INLAND AREAS FOR EARLY THIS
WEEK WITH HIGH TEMPERATURES COOLING TO AROUND 5 DEGREES BELOW
AVERAGE FOR INLAND AREAS ON WEDNESDAY. SOUTHWEST TO WEST WINDS FOR
THE MOUNTAINS AND DESERTS DURING THE AFTERNOON AND EVENING WILL
GUST TO 25 TO 35 MPH THROUGH MID WEEK. FOR NEXT WEEKEND, THERE
COULD BE SOME INFLUX OF MONSOONAL AND POSSIBLY TROPICAL MOISTURE
FROM AN AREA OF DISTURBED WEATHER WELL TO THE SOUTH OF THE
SOUTHERN TIP OF BAJA THAT MAY DEVELOP THIS WEEK AND TRACK TOWARDS
THE NORTHWEST.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH WEDNESDAY)
THE COOLING TREND WILL CONTINUE THROUGH WEDNESDAY WITH HIGH
TEMPERATURES ON WEDNESDAY AROUND 5 DEGREES BELOW AVERAGE FOR
INLAND AREAS. HIGH TEMPERATURES ON WEDNESDAY WILL RANGE FROM THE
MID TO UPPER 70S NEAR THE COAST TO THE MID 80S TO LOWER 90S FOR
THE INLAND EMPIRE WITH 100 TO 104 FOR THE LOWER DESERTS. PATCHY
NIGHT AND MORNING LOW CLOUDS WILL SPREAD INTO PORTIONS OF THE
WESTERN VALLEYS. ONSHORE FLOW WILL BE STRONGER WITH SOUTHWEST TO
WEST WINDS FOR THE DESERTS ONTO THE DESERT SLOPES OF THE MOUNTAINS
DURING THE AFTERNOON AND EVENING GUSTING TO 25 TO 35 MPH.
LONG TERM (THURSDAY THROUGH SUNDAY)
LOW PRESSURE WILL BE CENTERED IN THE VICINITY OF THE WEST COAST
FROM THE PACIFIC NORTHWEST INTO CALIFORNIA WITH HIGH PRESSURE OVER
THE CENTRAL STATES EXTENDING WESTWARD INTO NORTHWEST MEXICO. AN
AREA OF DISTURBED WEATHER WELL TO THE SOUTH OF THE SOUTHERN TIP OF
BAJA MAY DEVELOP THIS WEEK AND TRACK TOWARDS THE NORTHWEST.
DEPENDING ON THE DEVELOPMENT AND TRACK, THERE COULD BE SOME INFLUX
OF AT LEAST MONSOONAL MOISTURE INTO PORTIONS OF SOUTHERN
CALIFORNIA FOR NEXT WEEKEND, BUT MORE DIRECT IMPACTS FROM A
DECAYING TROPICAL CYCLONE ARE LESS LIKELY WITH SUPPORT OF LESS
THAN 5 PERCENT OF ENSEMBLE SOLUTIONS.
AVIATION
310600Z...COASTS/VALLEYS... LOW CLOUDS ARE EXPECTED TO FILL INLAND
THROUGH ABOUT 15 MILES, WITH PATCHY CIGS SPREADING INTO ORANGE
COUNTY AFTER 09Z. THERE IS ABOUT A 60% CHANCE OF CIGS IMPACTING KSNA
BETWEEN 11-16Z MONDAY. VIS RESTRICTIONS LIMITED TO WHERE CLOUDS
INTERSECT HIGHER TERRAIN. CLOUDS SCATTER OUT BY 16-17Z MON. CLOUDS
WILL REGATHER AND FILL BACK IN BEGINNING AROUND 01-03Z TUE AROUND
THE COASTAL AREAS OF SAN DIEGO AND CONTINUE TO FILL BACK IN ALONG
THE COASTAL SITES THROUGH THE REST OF THE FORECAST PERIOD. CLOUDS
WILL BEGIN TO SCATTER AGAIN FROM EAST TO WEST BEGINNING AROUND
15- 16Z TUE.
MTNS/DESERTS...OCCASIONAL FEW LOW CLOUDS AROUND 10,000 FT MSL
DURING THE AFTERNOON HOURS FROM 20-01Z, AND HIGH LVL CLOUDS AOA
20,000FT MSL THROUGH THE PERIOD. BREEZY WEST TO SOUTHWEST WINDS
20Z TO AROUND 05Z TUE. FOR THE DESERT SLOPES INTO THE DESERTS,
WITH GUSTS TO 20-30 KTS, LOCALLY UP TO 35-40 KTS THROUGH PASSES.
MARINE
GUSTS AROUND 20 KNOTS EXPECTED EACH AFTERNOON THROUGH THURSDAY IN
THE VICINITY OF SAN CLEMENTE ISLAND. LOCALIZED GUSTS NEAR THE ISLAND
MAY REACH 25 KTS ON TUESDAY/WEDNESDAY AFTERNOONS. OTHERWISE, NO
HAZARDOUS MARINE CONDITIONS ARE EXPECTED.
BEACHES
A 3-FOOT SWELL FROM THE SOUTH-SOUTHWEST (200 DEGREES) AT 15 SECONDS
WILL PERSIST THROUGH THIS EVENING. THIS WILL BRING LOCALIZED
ELEVATED SURF OF 3-5 FEET WITH SETS TO 6 FEET, ALONG WITH A HIGH RIP
CURRENT RISK TO SOUTHWEST-FACING BEACHES, MOSTLY IN NORTH SAN DIEGO
COUNTY AND ORANGE COUNTY. A NEW SOUTHERLY SWELL (180-190 DEGREES)
FROM HURRICANE KARINA WILL KEEP SURF ELEVATED AT 3-5 FEET WITH SETS
TO 6 FEET FOR MONDAY THROUGH WEDNESDAY. CONTINUED TROPICAL SWELLS
LOOK TO KEEP SURF ELEVATED THROUGH THE END OF THE WEEK AS WELL.
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/BEACHES...MM
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page