165
FXUS66 KSGX 260453
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
953 PM PDT WED MAR 25 2026
SYNOPSIS
HIGH TEMPERATURES FOR INLAND AREAS WILL REMAIN AROUND 15 TO 20
DEGREES ABOVE AVERAGE INTO THE WEEKEND, WITH SOME RECORD DAILY
HIGH TEMPERATURES CONTINUING TO BE TIED OR BROKEN, MAINLY FOR THE
MOUNTAINS AND DESERTS BUT OCCASIONALLY FOR THE INLAND VALLEYS AS
WELL. THE MARINE LAYER PRESENCE WILL CONTINUE, WITH SOME SMALL
DAY-TO-DAY VARIATIONS. COASTAL LOW CLOUDS NOT LIKELY TO SPREAD AS
FAR INLAND ON FRIDAY AND SATURDAY. MID AND HIGH CLOUDS WILL
SPREAD ACROSS THE AREA FOR THIS WEEKEND INTO EARLY NEXT WEEK. HIGH
TEMPERATURES WILL LOWER ONLY SLIGHTLY DURING THE WEEKEND, WITH
GREATER COOLING SPREADING INLAND EARLY NEXT WEEK AS A LOW PRESSURE
SYSTEM MOVES TOWARD THE CALIFORNIA COAST.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
UPDATE: AT THIS HOUR, THE MARINE LAYER IS SOMEWHAT BROKEN UP ALONG
THE COASTAL AREAS, ALTHOUGH SOME OF THE CLOUDS HAVE PUSHED BACK EAST
INTO THE INLAND VALLEYS OF NORTHERN SAN DIEGO COUNTY. THIS SHOULD
CONTINUE TO FILL IN BY LATER THIS EVENING AND EXTEND A LITTLE
FURTHER INLAND. THERE COULD ALSO BE SOME LOCALLY DENSE AREAS OF
PATCHY FOG DEVELOPING WITHIN SOME OF THESE INLAND AREAS AND ALONG
THE COASTAL SLOPES THAT INTERSECT. THERE COULD BE VISIBILITIES
PERIODICALLY REDUCED TO LESS THAN A HALF A MILE IN SOME OF THIS FOG,
ESPECIALLY ALONG THE I-15 CORRIDOR WITHIN SOME OF THE HIGHER INLAND
VALLEYS. THIS SHOULD SCATTER OUT SHORTLY AFTER SUNRISE, AND LEAD TO
MOSTLY CLEAR SKIES WITH JUST SOME PASSING HIGH CLOUDS.
THE FORECAST APPEARS TO REMAIN ON TRACK IN TERMS TO HIGH PRESSURE
REMAINING IN DOMINATION THROUGHOUT THE REST OF THE WORK WEEK, AND
THEN A COOLDOWN WILL FOLLOW THIS WEEKEND INTO NEXT WEEK AS THE RIDGE
FINALLY BREAKS DOWN AND PROPAGATES EASTWARD. THIS WILL ALLOW FOR
SOME TROUGHING TO POSSIBLY PROVIDE A CHANCE OF RAIN NEXT TUESDAY
THROUGH WEDNESDAY AS DETERMINISTIC MODELS SUGGEST. EVEN IF THE MAIN
ENERGY FROM THIS MAJOR SHORTWAVE REMAINS FAR ENOUGH TO THE NORTH TO
NOT PROVIDE MUCH IN THE WAY OF PRECIPITATION AS IT PASSES THROUGH,
IT WILL BRING A MUCH MORE SIGNIFICANT COOLDOWN WITH IT, WITH
TEMPERATURES RETURNING TO CLOSER VALUES FOR WHERE THEY SHOULD BE FOR
THIS TIME OF YEAR.
PREVIOUS DISCUSSION SUBMITTED AT 125 PM:
MOSTLY CLEAR THIS AFTERNOON EXCEPT FOR SOME LOW CLOUDS OVER THE
COASTAL WATERS. TEMPERATURES ARE WITHIN A FEW DEGREES OF WHERE
THEY WERE AT THIS TIME YESTERDAY. THE MARINE LAYER INFLUENCE WILL
PERSIST THROUGH THE WEEKEND, WITH DAY-TO-DAY VARIATIONS ON THE
DEPTH AND THE INLAND EXTENT OF THE LOW CLOUDS AND FOG DURING THE
NIGHTS AND MORNINGS.
DAYTIME HIGH TEMPERATURES WILL GRADUALLY TREND HIGHER THROUGH SATURDAY
AS THE HIGH PRESSURE RIDGE PERSISTS OVER THE SOUTHWEST. HIGH
TEMPERATURES TODAY WILL RANGE FROM AROUND 5 DEGREES ABOVE AVERAGE
NEAR THE COAST TO AROUND 20 DEGREES ABOVE AVERAGE IN THE
MOUNTAINS AND HIGH DESERT. IT LOOKS LIKE SATURDAY WILL BE THE
WARMEST DAY WITH HIGH TEMPERATURES RANGING FROM AROUND 10-12 DEGREES
ABOVE AVERAGE NEAR THE COAST TO 20-25 DEGREES ABOVE AVERAGE IN THE
SAN DIEGO COUNTY MOUNTAINS. SATURDAY HIGH TEMPERATURES WILL RANGE
FROM THE 70S TO LOW 80S NEAR THE COAST TO THE UPPER 80S TO MID
90S FOR THE INLAND EMPIRE, WITH THE UPPER 90S TO 103 FOR THE
LOWER DESERTS.
ONSHORE FLOW TODAY WILL BE STRONG ENOUGH TO PRODUCE SOUTHWEST
WINDS GUSTING 30-40 MPH IN THE FAVORED AREAS OF THE DESERTS AND
DESERT MTN SLOPES THIS AFTERNOON AND EVENING. ONSHORE FLOW WILL BE
NOTICEABLY WEAKER FOR THURSDAY THEN STRENGTHEN SOMEWHAT AGAIN ON
FRIDAY.
FOR SUNDAY THROUGH NEXT WEDNESDAY...TEMPERATURES WILL TREND LOWER
AND CLOUDS WILL GENERALLY INCREASE AS A LOW PRESSURE SYSTEM
APPROACHES THE CA COAST FROM THE WEST, DISPLACING THE HIGH
PRESSURE RIDGE TO THE SOUTHEAST INTO TX. NEXT WEDNESDAY WILL
LIKELY BE THE COOLEST DAY, WITH DAYTIME HIGH TEMPS IN THE 60S-70S
WEST OF THE MTNS AND IN THE 80S IN THE LOW DESERTS.
A SIGNIFICANT PERCENTAGE OF ENSEMBLE MEMBERS (MOST FROM THE
EUROPEAN MODEL) INDICATE THE POTENTIAL FOR PRECIP NEXT TUE/WED AS
THE LOW PRESSURE SYSTEM MOVES INLAND. AT THIS TIME, THE NATIONAL
BLEND OF MODELS INDICATE UP TO A 35 PERCENT CHANCE (MAINLY IN THE
MTNS) FOR AT LEAST 0.01 INCH. ANY RAINFALL WILL LIKELY BE CONFINED
TO AREAS FROM THE MTNS WESTWARD. UNCERTAINTY IS STILL HIGH DUE TO
THE SPREAD AMONG THE MODEL SOLUTIONS.
AVIATION
260500Z...COAST/VALLEYS...PATCHY LOW CLOUDS BASED 800-1300 FT MSL
ARE SLOWLY FILLING IN ALONG THE COAST AND INLAND AND ARE EXPECTED TO
FILL INTO INLAND AREAS GRADUALLY UP TO THE INLAND VALLEYS. VIS
REDUCED 0-3SM IN EASTERN VALLEYS (I.E. RAMONA) AND FOOTHILLS AND 3-5
SM MAINLY OVER HIGHER COASTAL TERRAIN AND WESTERN VALLEYS. BASES MAY
GRADUALLY LOWER A FEW HUNDRED FEET AFTER 08Z, DROPPING VIS TO 1-3SM
FOR ELEVATED COASTAL MESAS (AND ALONG I-15 CORRIDOR) AND 4-6SM FOR
COASTAL AREAS.
THERE IS A 30% CHANCE FOR CIGS TO SPREAD INTO THE NORTHWEST IE VCNTY
KONT AFTER 10Z, BUT HIGHER CONFIDENCE IN MISTY CONDITIONS WITH MVFR
VIS BUT NO CIGS. CLOUDS SCATTER OUT THU 15-17Z.
CLOUDS WITH LOWER BASES, AROUND 400-900 FT MSL EXPECTED TO DEVELOP
OVER WATERS, SLOWLY REACHING THE COAST AROUND 04-06Z FRI.
MOUNTAINS/DESERTS...BREEZY W/SW WINDS OVER DESERT SLOPES AND
MOUNTAIN PASSES, GUSTING 25-35 KTS THROUGH 12Z THU.
OTHERWISE, MOSTLY CLEAR AND VFR CONDITIONS WILL PREVAIL THROUGH
THURSDAY EVENING.
MARINE
NO HAZARDOUS MARINE CONDITIONS EXPECTED THROUGH 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.
UPDATE...STEWEY
PUBLIC...PG
AVIATION/MARINE...WESTERINK
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