539
FXUS66 KSGX 011009
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
309 AM PDT TUE JUL 1 2025
SYNOPSIS
A WEAK UPPER LEVEL LOW PRESSURE SYSTEM MOVING INLAND THROUGH
CENTRAL AND SOUTHERN CALIFORNIA ON WEDNESDAY WILL COOL HIGH
TEMPERATURES AROUND 5 DEGREES THROUGH THURSDAY. THE MARINE LAYER
WILL SLOWLY DEEPEN THROUGH THURSDAY WITH NIGHT AND MORNING COASTAL
LOW CLOUDS SPREADING FARTHER INTO THE VALLEYS LATE EACH NIGHT.
THIS WILL BE FOLLOWED BY A SLOW WARMING TREND THROUGH NEXT WEEKEND
WITH HIGH TEMPERATURES WARMING AROUND 5 DEGREES THROUGH SUNDAY.
NIGHT AND MORNING COASTAL LOW CLOUDS WILL NOT SPREAD AS FAR INTO
THE VALLEYS FOR NEXT WEEKEND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH THURSDAY)
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.
THIS WILL SPREAD COOLING INLAND THROUGH THURSDAY WITH HIGH
TEMPERATURES COOLING AROUND 5 DEGREES THROUGH THURSDAY WITH HIGH
TEMPERATURES ON THURSDAY AS MUCH AS 4 TO 8 DEGREES BELOW AVERAGE
FOR THE MOUNTAINS AND INLAND VALLEYS. HIGH TEMPERATURES ON
THURSDAY WILL RANGE FROM AROUND 70 NEAR THE COAST TO THE 80S AND
LOWER 90S FOR THE INLAND EMPIRE WITH 104 TO 108 DEGREES FOR THE
LOWER DESERTS. A MARINE LAYER NEAR 1500 TO 2000 FEET DEEP WILL
DEEPEN TO 2000 TO 2500 FEET FOR THURSDAY WITH NIGHT AND MORNING
COASTAL LOW CLOUDS SPREADING FARTHER INTO THE VALLEYS.
LONG TERM (FRIDAY THROUGH MONDAY)
A SLOW WARMING TREND WILL FOLLOW FOR FRIDAY INTO EARLY NEXT WEEK
WITH HIGH TEMPERATURES FOR THE COAST AND VALLEYS WARMING TO AROUND
AVERAGE ON SUNDAY WITH HIGH TEMPERATURES FOR THE LOWER DESERTS
WARMING TO AROUND 10 DEGREES ABOVE AVERAGE FOR EARLY NEXT WEEK.
HIGH TEMPERATURES ON SUNDAY WILL RANGE FROM THE LOWER 70S NEAR THE
COAST TO THE UPPER 80S TO MID 90S FOR THE INLAND EMPIRE WITH 106
TO 110 FOR THE LOWER DESERTS. THE MARINE LAYER WILL DECREASE IN
DEPTH TO 1500 TO 2000 FEET WITH NIGHT AND MORNING COASTAL LOW
CLOUDS ONLY SPREADING INTO PORTIONS OF THE WESTERN VALLEYS LATE
EACH NIGHT FOR THE WEEKEND.
AVIATION
011000Z....COAST/VALLEYS...LOW CLOUDS BASED 800-1300 FT MSL HAVE
PUSHED INTO COASTAL SD COUNTY WITH COASTAL ORANGE COUNTY FILLING IN
CURRENTLY. CLOUDS REACHING UP TO 15 MILES INLAND BY 12Z. VIS
RESTRICTIONS (1-5SM) FOR ELEVATED WESTERN VALLEYS. CLOUDS AND VIS
RESTRICTIONS CLEARING INLAND 14-16Z AND ALONG THE COAST 16-18Z,
THOUGH THERE IS A 30-40% CHANCE OF BKN-OVC CIGS AT THE SAN DIEGO
COUNTY BEACHES THROUGH THE AFTERNOON. CLOUDS WITH SIMILAR BASES
PUSH INLAND AGAIN AFTER 03Z WEDNESDAY. OTHERWISE AREAS OF FU/HZ
NEAR ONGOING WILDFIRES (VIS 1-3SM) IN THE INLAND EMPIRE.
MOUNTAINS/DESERTS
WEST WINDS GUSTING 25-35 KT THROUGH THE PASSES
AND ON THE DESERT MOUNTAIN SLOPES TUESDAY AFTERNOON AND EVENING WITH
ASSOCIATED MOD UDDFS OVER AND EAST OF THE MOUNTAINS.
MARINE
NO HAZARDOUS MARINE WEATHER CONDITIONS ARE EXPECTED THROUGH SATURDAY.
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 AND 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...17
AVIATION/MARINE/BEACHES...KW
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