420
FXUS66 KSGX 260826 RRC
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
124 AM PDT THU MAR 26 2026
SYNOPSIS
RECORD SETTING HEAT WILL CONTINUE FOR SOME INLAND AREAS INTO THE
WEEKEND. MID AND HIGH CLOUDS WILL SPREAD ACROSS THE AREA DURING THE
WEEKEND. A LOW PRESSURE SYTEM MOVING INLAND THROUGH CALIFORNIA
AROUND THE MIDDLE OF NEXT WEEK WILL SPREAD COOLING INLAND FOR MONDAY
THROUGH WEDNESDAY OF NEXT WEEK WITH INLAND HIGH TEMPERATURES FALLING
TO A FEW TO AROUND 5 DEGREES BELOW AVERAGE ON WEDNESDAY. THERE IS A
SLIGHT CHANCE OF PRECIPITATION FOR TUESDAY INTO WEDNESDAY OF NEXT
WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SATURDAY)
THE MARINE LAYER IS SLIGHTLY SHALLOWER THAN 24 HOURS AGO, AROUND
1500 FEET DEEP, WITH SATELLITE IMAGERY SHOWING COASTAL LOW CLOUDS
SPREADING INTO THE WESTERN VALLEYS IN SAN DIEGO COUNTY AND SPREADING
NORTHWESTWARD ACROSS THE COAST AND COASTAL PLAIN IN ORANGE COUNTY.
THE COASTAL LOW CLOUDS COULD EVENTUALLY SPREAD INTO FAR SOUTHERN
AND WESTERN PORTIONS OF THE INLAND EMPIRE AROUND SUNRISE THIS
MORNING. THE MARINE LAYER WILL BECOME GRADUALLY SHALLOWER INTO
SATURDAY WITH COASTAL LOW CLOUDS ONLY SPREADING INTO THE FAR WESTERN
VALLEYS FOR EARLY FRIDAY AND MOSTLY NOT PAST COASTAL AREAS FOR EARLY
SATURDAY.
THERE WILL BE SLOW WARMING INTO SATURDAY WITH HIGH TEMPERATURES FOR
SOME INLAND AREAS AS MUCH AS 20 TO 25 DEGREES ABOVE AVERAGE ON
SATURDAY. HIGH TEMPERATURES ON SATURDAY WILL RANGE FROM THE 70S NEAR
THE COAST TO THE LOWER TO MID 90S FOR THE INLAND EMPIRE WITH THE
LOWER DESERTS IN THE UPPER 90S. MID AND HIGH CLOUDS FROM THE
SOUTHWEST WILL SPREAD ACROSS THE AREA ON SATURDAY.
LONG TERM (SUNDAY THROUGH WEDNESDAY)
WEAK ONSHORE FLOW WILL RETURN ON SUNDAY AND STRENGTHEN NEXT WEEK AS
A LOW PRESSURE SYSTEM MOVES TOWARD THE CALIFORNIA COAST AND INLAND
THROUGH CALIFORNIA AROUND THE MIDDLE OF NEXT WEEK. COOLING WILL
BEGIN TO SPREAD INLAND ON SUNDAY WITH GREATER COOLING FOR MONDAY
THROUGH WEDNESDAY OF NEXT WEEK. HIGH TEMPERATURES ON WEDNESDAY OF
NEXT WEEK WILL BE MOSTLY IN THE MID 60S TO LOWER 70S FOR THE COAST
AND VALLEYS AND IN THE UPPER 70S TO MID 80S FOR THE LOWER DESERTS, A
FEW TO AROUND 5 DEGREES BELOW AVERAGE FOR SOME INLAND AREAS.
THAT LOW PRESSURE SYSTEM WILL ALSO BRING A CHANCE OF SHOWERS FOR
TUESDAY INTO WEDNESDAY WITH ANY RAINFALL RANGING FROM LESS THAN ONE-
TENTH INCH NEAR THE COAST TO ONE-TENTH TO LOCALLY ONE-QUARTER INCH
ALONG THE COASTAL SLOPES OF THE MOUNTAINS. THERE REMAINS MODEL
SPREAD ON BOTH THE TIME AND POTENTIAL AMOUNTS. CLUSTER ANALYSIS
SHOWS THE MODEL ENSEMBLE SOLUTIONS WITH THE GREATER POTENTIAL TO
GENERATE AT LEAST SOME LIGHT PRECIPITATION AROUND TUESDAY NIGHT AND
WEDNESDAY OF NEXT WEEK ARE THOSE THAT ARE SLIGHTLY STRONGER WITH THE
LOW PRESSURE CENTERED ALONG THE CALIFORNIA COAST.
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.
PUBLIC...17
AVIATION/MARINE...WESTERINK
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