216
FXUS66 KSGX 011946
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1246 PM PDT MON JUN 1 2026
SYNOPSIS
SLOW WARMING WILL CONTINUE FOR THE INLAND AREAS THROUGH MID WEEK,
BRINGING HIGH TEMPERATURES TO 4 TO 10 DEGREES ABOVE AVERAGE FOR
WEDNESDAY AND THURSDAY. THE COAST AND VALLEYS WILL COOL A FEW
DEGREES ON TUESDAY, THEN WARM A FEW DEGREES FOR WEDNESDAY AND
THURSDAY, WITH NIGHT AND MORNING COASTAL LOW CLOUDS SPREADING
INTO PORTIONS OF THE VALLEYS LATE EACH NIGHT. A LOW PRESSURE
SYSTEM MOVING INTO THE WESTERN STATES WILL BRING A COOLING TREND
FOR FRIDAY THROUGH THE WEEKEND, WITH HIGH TEMPERATURES FOR NEXT
SUNDAY FALLING TO A FEW TO ABOUT 10 DEGREES BELOW AVERAGE BY
SUNDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
PREDOMINATELY ZONAL FLOW ALOFT TODAY HAS RESULTED IN WHAT SOME MAY
CALL CHAMBER OF COMMERCE WEATHER, I.E. SUNNY AND WARM. WEAK
TROUGHING MOVING INTO THE WESTERN PART OF THE REGION LATE TONIGHT
WILL LEAD TO THE MARINE LAYER MOVING IN EARLIER THIS EVENING,
LIKELY MOVING INTO THE IMMEDIATE COAST ALONG SAN DIEGO COUNTY 5-6
PM. CLOUDS WILL BE AROUND 2000-2500 FEET ABOVE THE GROUND+ AND
WILL MOVE A LITTLE FARTHER INLAND THAN THIS MORNING, INCLUDING
INTO PARTS OF THE INLAND EMPIRE. THESE WILL CLEAR OUT, SIMILAR TO
THIS MORNING, MID TO LATE MORNING TUESDAY. THE WEAK TROUGH WILL
ALSO LEAD TO A FEW DEGREES OF COOLING BETWEEN THIS AFTERNOON'S
HIGHS AND TUESDAY'S HIGHS OUTSIDE OF THE MOUNTAINS AND DESERTS,
WHERE IT WILL WARM A DEGREE OR TWO FOR TOMORROW.
THIS TROUGH WILL SWIFTLY MOVE SOUTHWEST OUT OF THE REGION AS A
WEAK RIDGE MOVES IN FROM THE EAST MID-WEEK. TEMPERATURES WILL
WARM A TAD OVER THE REGION FOR WEDNESDAY AND THURSDAY TO 4-10
DEGREES ABOVE AVERAGE FOR INLAND AREAS, AND THE MARINE LAYER WILL
GET A BIT SHALLOWER (TRAVEL LESS FAR INLAND OVERNIGHT). BROAD,
STRONGER TROUGHING MOVING INTO THE WESTERN U.S. WILL LEAD TO A
COOLING TREND FRIDAY THROUGH AT LEAST SUNDAY, THOUGH PERSISTING
MODEL DIFFERENCES IN STRENGTH AND POSITION LEAD TO A BIT OF
UNCERTAINTY REGARDING DEGREE AND LONGEVITY OF THE COOLING. THE
CURRENT FORECAST IS FOR HIGH TEMPERATURES 5-10 BELOW AVERAGE
INLAND FOR SUNDAY. MARINE LAYER CLOUDS WILL DEEPEN AGAIN, REACHING
FARTHER INLAND TO COVER MOST OF THE VALLEYS OVER THE WEEKEND.
AVIATION
011730Z...COAST/VALLEYS...LOW CLOUDS HAVE CLEARED THE INLAND EMPIRE
AND ARE MAKING A QUICK RETREAT OUT OF THE VALLEYS AND CLEARING TO
THE COAST. LOW CLOUDS BASED 1500-2000 FT MSL WILL HANG OUT OVER THE
COASTAL WATERS WITH A FEW LOW CLOUDS WAFTING IN OVER COASTAL AREAS
AT TIMES. LOW CLOUDS WITH BASES 1000-2000 FT MSL WILL BEGIN TO PUSH
BACK IN AFTER 23Z ALONG THE COAST AND FURTHER INLAND INTO OC AND SD
AFTER 03-04Z TUESDAY AND INTO THE INLAND EMPIRE AFTER 6-10Z.
MOUNTAINS/DESERTS...MOSTLY CLEAR SKIES AND VFR CONDITIONS EXPECTED
THROUGH THE PERIOD.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY.
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...CSP
AVIATION/MARINE...VILLAFANE
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