348
FXUS66 KSGX 020401
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
901 PM PDT TUE JUL 1 2025
SYNOPSIS
MINOR COOLING IS EXPECTED EACH DAY THROUGH THURSDAY. A GRADUAL
WARMING IS EXPECTED FRIDAY THROUGH THE WEEKEND. NIGHT AND MORNING
LOW CLOUDS AND FOG ARE EXPECTED TO REMAIN PERSISTENT ALONG THE COAST
AND INTO PORTIONS OF THE VALLEYS THROUGH THE WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS EVENING...POCKETS OF ELEVATED CONVECTION COULD CONTINUE FOR A
FEW MORE HOURS OVER PORTIONS OF THE DESERTS AND LOCAL MTNS. THE
PRIMARY THREAT POSED BY THE CONVECTIVE ELEMENTS WOULD BE THE
OCCASIONAL DRY LIGHTNING STRIKE. ANY PRECIPITATION THAT FALLS WILL
LIKELY EVAPORATE IN THE DRY SUB-CLOUD LAYER BEFORE REACHING THE
GROUND. THE MARINE LAYER REMAINS AT A FAIRLY CONSISTENT DEPTH AND
LOW CLOUDS ARE FORMING IN COASTAL SAN DIEGO COUNTY AND WILL LIKELY
SPREAD INLAND AND NORTHWARD INTO OC IN SIMILAR FASHION TO LAST
NIGHT.
FROM PREVIOUS DISCUSSION...
A WEAK UPPER LEVEL LOW PRESSURE SYSTEM CENTERED OFF THE CENTRAL
CALIFORNIA COAST WILL MOVE SLOWLY INLAND INTO CENTRAL AND SOUTHERN
CALIFORNIA ON WEDNESDAY, THEN WEAKEN AND MOVE INLAND INTO ARIZONA ON
THURSDAY. THAT WILL HELP SPREAD COOLING INLAND THROUGH THURSDAY.
HIGH TEMPERATURES WILL GRADUALLY DECREASE EACH DAY, BRINGING
TEMPERATURES ON THURSDAY DOWN TO 4 TO 8 DEGREES BELOW AVERAGE FOR
THE MOUNTAINS AND INLAND VALLEYS. IT WILL ALSO PULL MID TO UPPER
LEVEL MOISTURE INTO SOUTHERN CALIFORNIA. THIS WILL RESULT IN AREAS
OF HIGH CLOUDS OVER THE MOUNTAINS AND DESERTS THROUGH WEDNESDAY.
EVEN WITH THE INFLUX IN MOISTURE, DRY CONDITIONS ARE EXPECTED TO
PREVAIL.
FOR THE 4TH OF JULY HOLIDAY THROUGH EARLY NEXT WEEK, A SLOW WARMING
WILL OCCUR. BY MONDAY, NBM CHANCES FOR THE LOW DESERTS TO EXCEED 110
DEGREES BEGIN TO INCREASE TO AROUND 40 PERCENT. SIMILAR CHANCES FOR
TUESDAY. BY TUESDAY, MOST LOCATIONS ARE EXPECTED TO SEE HIGH
TEMPERATURES 2 TO 5 DEGREES ABOVE AVERAGE. MARINE LAYER LOW CLOUD
AND FOG COVERAGE WILL REMAIN PERSISTENT EACH NIGHT AND MORNING FOR
THE COAST AND INTO PORTIONS OF THE VALLEYS WITH MINOR VARIATIONS IN
DEPTH.
AVIATION
020315Z....COAST/VALLEYS...LOW CLOUDS WITH BASES 1000-1500 FT MSL
WILL FILL IN ALONG THE COAST BY 06Z, THEN SPREAD 15-20 MI INLAND BY
12Z. LOCAL VIS 3-5 SM IN BR/HZ WHERE CLOUDS NEAR TERRAIN IN THE
VALLEYS, INCLUDING VCTY KAJO AND KCNO. CLOUDS CLEARING TO THE COAST
15-18Z, THEN REDEVELOPING AROUND 03/03Z WITH BASES NEAR 900-1300 FT
MSL. OTHERWISE A FEW CLOUDS NEAR 15,000 FT MSL AND UNRESTRICTED VIS
THROUGH WEDNESDAY EVENING.
MOUNTAINS/DESERTS...SCT CLOUDS IN THE 10-15 KFT LAYER AND OCCASIONAL
VIRGA/LIGHT SHOWERS CONTINUING OVER THE DESERTS THROUGH ABOUT 18Z
WEDNESDAY. OTHERWISE CLEAR WITH UNRESTRICTED VIS THROUGH WEDNESDAY
EVENING.
MARINE
NO HAZARDOUS MARINE WEATHER CONDITIONS ARE EXPECTED THROUGH SUNDAY.
BEACHES
BUILDING SOUTHERLY SWELL (190 DEGREES) OF 3 FEET AT 14-15 SECONDS
WILL GENERATE ELEVATED SURF OF 3-5 FT WITH SETS TO 6 FT ALONG
SOUTHERLY FACING BEACHES IN ADDITION TO STRONG RIP AND LONGSHORE
CURRENTS AT ALL BEACHES FRIDAY AND SATURDAY. SWELL AND SURF WILL
BEGIN TO LOWER ON SUNDAY.
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...PG
AVIATION/MARINE/BEACHES...SS
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