424
FXUS66 KSGX 071053
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
353 AM PDT SUN JUN 7 2026
SYNOPSIS
NOT AS HOT THIS WEEKEND WITH BREEZY CONDITIONS ACROSS THE
MOUNTAINS AND DESERTS. TEMPERATURES WILL HOLD NEAR AVERAGE FOR THE
FIRST HALF OF THE WEEK AS A TROUGHING PATTERN LINGERS WITH A
DEEPER MARINE LAYER. HIGH PRESSURE MOVES IN BY WEDNESDAY INTO THE
LATTER HALF OF NEXT WEEK, BRINGING A WARMING TREND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
UPDATE: CLOUDS HAVE LIFTED ENOUGH TO COMPLETELY FILL INTO THE INLAND
EMPIRE AT THIS HOUR, AND THEREFORE OVERCAST SKIES ARE LIKELY TO
REMAIN IN PLACE THROUGH THE EARLY HOURS FOR A GOOD PORTION OF ALL
OF THE INLAND AREAS. EXPECT CLOUDS TO BEGIN TO DISSIPATE FROM
EAST TO WEST SHORTLY AFTER SUNRISE, ALTHOUGH GIVEN THE STRENGTH OF
THE INVERSION, SOME AREAS MAY STRUGGLE TO CLEAR OUT COMPLETELY
THROUGH MID-MORNING. SOME PATCHY FOG WILL BE POSSIBLE WITHIN SOME
OF THE HIGHER INLAND VALLEYS ALONG THE I-15 CORRIDOR.
TODAY THROUGH TOMORROW NIGHT...
THE LATEST GOES NIGHT FOG REVEALS THAT THE HIGH CLOUDS ASSOCIATED
WITH A FINGER OF THE SUBTROPICAL JET CONTINUES TO EXIT THE REGION,
WHICH IS HELPING TO ALLOW FOR THE MARINE LAYER TO FILL IN WEST OF
THE MOUNTAINS FOR ALL LOCATIONS UNDER ROUGHLY 1500-2000 FT ELEVATION
WITHIN SAN DIEGO AND ORANGE COUNTIES. GIVEN LOW LEVEL FLOW, THESE
CLOUDS ARE STRUGGLING TO MAKING IT INTO THE IE, ALTHOUGH LIFTING OF
THE MARINE LAYER THROUGH THE MORNING HOURS AS 500 MB HEIGHTS
CONTINUE TO FALL MAKE AID IN THESE CLOUDS FILLING INTO PORTIONS OF
THE IE (MAINLY FOR THE TEMECULA AND ONTARIO AREAS).
AS AFOREMENTIONED, THE MAJOR SHORTWAVE TROUGH IMPACTING THE REGION
WILL CONTINUE TO PROPAGATE ACROSS THE WESTERN STATES AND INTO THE
GREAT BASIN, WHICH WILL ALLOW FOR HEIGHTS TO FALL AND LIFTING OF THE
MARINE LAYER SLIGHTLY. GIVEN HOW PERSISTENT ONSHORE FLOW IS, THERE
WILL LIKELY BE A FEW LOCATIONS ALONG THE COASTAL AREAS THAT WILL BE
SOCKED IN WITH OVERCAST SKIES THROUGHOUT THE DAY. THESE CLOUDS WILL
BREAK FOR MUCH OF THE INLAND AREAS BY LATER THIS MORNING. WINDS
ACROSS THE HIGHER TERRAIN AND THROUGH THE GAPS WILL INCREASE AGAIN
DURING THIS AFTERNOON, BUT NOT BE QUITE AS STRONG AS YESTERDAY.
THERE COULD STILL BE THE OCCASIONAL GUST OVER 50 MPH WITHIN GORGONIO
PASS. TEMPERATURES WILL STILL BE ON THE CHILLY SIDE FOR TODAY. WINDS
WILL DECOUPLE AND WEAKEN GOING INTO THE LATER PART OF THE EVENING,
WITH LOW CLOUDS CONTINUING TO FILL IN WEST OF THE MOUNTAINS.
ON MONDAY, TEMPERATURES WILL BE SLIGHTLY WARMER THAN TODAY AS HIGH
PRESSURE REESTABLISHES ITSELF. WINDS DURING THE AFTERNOON WILL PICK
BACK UP ACROSS THE MOUNTAINS AND HIGH DESERTS, WITH SIMILAR VALUES
AS THIS AFTERNOON AS OVERALL TROUGHING REMAINS IN PLACE. THE MARINE
LAYER WILL BEGIN TO LOWER BY LATER IN THE EVENING TOMORROW AND FILL
BACK IN.
TUESDAY THROUGH SATURDAY...
HIGH PRESSURE IS GOING TO FURTHER SET BACK IN WITH THE TROUGH SLOWLY
TRANSITIONING EASTWARD AND OUT OF THE REGION, WHICH WILL GRADUALLY
BE REPLACED BY AN EXPANDING AREA OF RIDGING OVER THE E PAC WATERS,
THAT WILL BEGIN TO EDGE ITS WAY CLOSER TO THE REGION THROUGHOUT THE
LATER HALF OF THE UPCOMING WEEK. THIS WILL RESULT IN A WARMING
TREND, ESPECIALLY BY THURSDAY INTO FRIDAY. THE MARINE LAYER WILL
ALSO CONTINUE TO LOWER, WITH VIS RESTRICTIONS DURING THE EARLY
MORNING HOURS BECOMING A LOT MORE LIKELY FURTHER WEST TO THE COASTAL
AREAS. ENSEMBLES DEPICT THAT DRY CONDITIONS WILL PERSIST GOING INTO
THE FOLLOWING WEEKEND AS WEAK RIDGING REMAINS LOCKED IN PLACE AS A
DEEPENING LONGWAVE TROUGH ADVANCES SOUTHWARD ACROSS MID CONUS.
AVIATION
071000Z...COAST/VALLEYS...LOW CLOUDS BASED 1900-2400 FT MSL HAVE
FILLED MOST OF THE COASTAL BASIN EARLY THIS MORNING. VIS 0-5SM ALONG
MOUNTAIN FOOTHILLS. SCATTER OUT INLAND TO THE COAST 16-19Z, THOUGH
SOME AREAS ALONG THE COASTLINE MAY NOT CLEAR UNTIL THE EARLY
AFTERNOON. 20-30% CHANCE FOR BKN CIGS ALL DAY AT KSAN. LOW CLOUDS
MOVE BACK INLAND STARTING 01-02Z MON WITH SLIGHTLY LOWER BASES.
SIMILAR INLAND EXTENT SUNDAY NIGHT, THOUGH PORTIONS OF THE INLAND
EMPIRE MAY REMAIN FEW-SCT.
MOUNTAINS/DESERTS...VFR WITH SCT CLOUDS AOA 20000FT MSL THROUGH THIS
MORNING. ELEVATED SOUTHWEST-WEST WINDS RETURN THIS AFTERNOON AND
EVENING WITH GUSTS 20-35 KNOTS ALONG DESERT SLOPES AND LOCALLY INTO
DESERTS. GUSTS MAY EXCEED 40 KTS THROUGH THE BANNING PASS. MOD
UP/DOWNDRAFTS AND POCKETS OF LLWS IN LEE (NORTH AND EAST) OF
MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH WEDNESDAY NIGHT.
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...STEWEY
AVIATION/MARINE...KW
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