148
FXUS66 KSGX 050445
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
945 PM PDT THU JUN 4 2026
SYNOPSIS
TODAY FEATURES THE WARMEST DAY OF THE NEXT WEEK, WITH HIGHS FOR
INLAND AREA 7 TO 12 DEGREES ABOVE AVERAGE. SIMILAR TEMPERATURES ON
FRIDAY ARE FOLLOWED BY COOLER TEMPERATURES FOR THIS WEEKEND INTO
EARLY NEXT WEEK. A SHALLOW MARINE LAYER LIMITED TO THE COASTS AND
WESTERN VALLEYS TODAY AND TOMORROW DEEPENS FOR THIS WEEKEND INTO
NEXT WEEK. ELEVATED SOUTHWEST TO WEST WINDS DURING THE AFTERNOON
AND EVENING ON FRIDAY AND SATURDAY FOR THE MOUNTAINS AND DESERTS
WILL GUST TO 30 TO 40 MPH. NEAR TO SLIGHTLY BELOW AVERAGE
TEMPERATURES TO PERSIST INTO MID-LATE NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
NEW AVIATION AND MARINE DISCUSSION...
THIS MORNING'S SOUNDING SHOWS A STRONGER SUBSIDENCE INVERSION AIDED
BY AN AXIS OF THE SUBTROPICAL RIDGE DRAWING CLOSER. THIS HAS ALLOWED
THE MARINE LAYER CLOUDS TO BE MORE STUBBORN THAN YESTERDAY, CLEARING
FOR THE INLAND AREAS, BUT REMAIN FAIRLY STUCK ALONG THE BEACHES AND
IMMEDIATE COASTAL AREAS. INTERMITTENT CLEARING IS POSSIBLE
THROUGH THE AFTERNOON, BUT CLOUDS SHOULD STICK AROUND FOR MOST OF
THE DAY. ELSEWHERE, CLEAR SKIES AND MILD CONDITIONS EXPECTED UNDER
THE BUILDING RIDGE - AFTERNOON HIGH TEMPERATURES IN THE UPPER 80S
TO LOW 90S FOR INLAND VALLEYS AND UPPER 90S TO LOW 100S FOR THE
DESERTS, ABOUT 7-12 DEGREES ABOVE NORMAL.
THE RIDGE PEAKS IN INTENSITY LATER TODAY AS A LARGE UPPER TROUGH
BEGINS TO NUDGE IT'S WAY INTO THE PACIFIC NORTHWEST ON FRIDAY. THIS
HELPS NUDGE TEMPERATURES DOWN A TOUCH AND SHOULD HELP THE MARINE
LAYER CLEAR BACK MORE TOMORROW AS WELL. AS THIS TROUGH PUSHES IN ON
FRIDAY INTO SATURDAY, THE RIDGE IS BACKS OFF TO THE SOUTHWEST SOME
BUT AN ONSHORE PRESSURE GRADIENT STRENGTHENS, ALLOWING FOR SOUTH TO
SOUTHWEST WIND GUSTS OF 30-45 MPH FOR MOUNTAIN PASSES, DESERTS, AND
DESERT SLOPES FRIDAY AND SATURDAY AFTERNOONS. TEMPERATURES ALSO
CONTINUE TO TREND COOLER THROUGH THE WEEKEND THANKS TO THE TROUGH,
WITH HIGH TEMPERATURES RETURNING BACK TO NORMAL BY SATURDAY. THE
SLOW PROGRESSION OF THIS LARGE TROUGH KEEPS THE COOLER TEMPERATURES
IN PLACE INTO EARLY NEXT WEEK, WITH HIGHS FLOATING NEAR TO SLIGHTLY
BELOW AVERAGE. AS THE FORECAST STRETCHES INTO EARLY-MID NEXT WEEK,
ENSEMBLES BEGIN TO DIVERGE SOME, BUT THERE IS STILL FAIRLY GOOD
AGREEMENT IN THE SLOW PROGRESSION OF THIS TROUGH, FOLLOWED BY A
SECONDARY REINFORCING UPPER LOW. MUCH MORE DISAGREEMENT FOLLOWS
REGARDING THE PROGRESSION OF THIS SECONDARY TROUGH, BUT THE GENERAL
CONSENSUS IS THAT A DEEP MARINE LAYER AND COOL TO NEAR AVERAGE
TEMPERATURES SHOULD PERSIST THROUGH MID-LATE WEEK.
AVIATION
050440Z...COAST/VALLEYS...LOW CLOUDS ARE MAKING THEIR WAY INLAND
OVER THE COASTAL AREAS AND INTO THE ADJACENT VALLEYS WITH CIGS
CURRENTLY BETWEEN 1000-1500 FT MSL. LOW CLOUDS WILL CONTINUE TO FILL
INTO THE VALLEY AREAS, STRETCHING INLAND 20-25 MILES. BASES ARE
EXPECTED TO LOWER BRIEFLY AROUND 08-10Z 700-1000 FT MSL IN SD AND 14-
16Z IN OC. LOCALIZED VIS REDUCTIONS TO 4-6 SM FOR INLAND VALLEYS AND
HIGHER COASTAL TERRAIN WILL BE POSSIBLE, WITH LOWER VIS WHERE CLOUDS
INTERSECT HIGHER TERRAIN. CHANCES FOR LOW CLOUDS HAVE INCREASED TO
40-55% FOR CIGS IN AND AROUND KONT FROM 10-15Z. LOW CLOUDS WILL
CLEAR THE VALLEYS AFTER 16-17Z AND ARE EXPECTED TO CLING ALONG MOST
OF THE COAST LINE THROUGH THE REST OF THE PERIOD. CIGS WILL INCREASE
IN HEIGHT 17-19Z TO 1200-1700 FT MSL. LOW CLOUDS WILL BEGIN TO SHIFT
INLAND AFTER 02Z SATURDAY WITH SIMILAR BASES EXPECTED.
MOUNTAINS/DESERTS...EXPECT CLEAR SKIES AND VFR CONDITIONS THROUGH
THE PERIOD.
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...MUNYAN
AVIATION/MARINE...VILLAFANE
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