978
FXUS66 KSGX 231945
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1245 PM PDT MON MAR 23 2026
SYNOPSIS
HIGH PRESSURE ALOFT WILL MAINTAIN HIGH TEMPERATURES THROUGH FRIDAY
FROM AROUND 10 DEGREES ABOVE AVERAGE NEAR THE COAST TO 15 TO 20
DEGREES ABOVE AVERAGE FOR INLAND AREAS. NIGHT AND MORNING COASTAL
LOW CLOUDS AND FOG WILL SPREAD INTO THE WESTERN VALLEYS AT TIMES.
COOLING WILL BEGIN TO SPREAD FARTHER INLAND NEXT WEEKEND, BUT
WITH HIGH TEMPERATURES FOR NEXT SUNDAY STILL 10 TO 15 DEGREES
ABOVE AVERAGE IN THE COASTAL AREAS AND INLAND VALLEYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS AFTERNOON...TEMPERATURES ARE NEAR OR A LITTLE HIGHER THAN AT
THIS TIME YESTERDAY EXCEPT IN THE LOW DESERTS AND PORTIONS OF THE
INLAND VALLEYS. OVERNIGHT, MARINE LAYER LOW CLOUDS AND FOG HAD
SPREAD INTO THE WESTERN PORTIONS OF THE INLAND VALLEYS LIKELY
MODERATING TEMPERATURES.
HIGH PRESSURE RIDGING OVER SOCAL WITH A CLOSED UPPER LOW OFF THE
COAST OF NORTHERN BAJA WILL CONTROL OUR WEATHER THROUGH THE
WORKWEEK. THE RIDGE WILL BUILD OVER THE REGION THROUGH TUESDAY AS
THE CLOSED UPPER LOW MOVES TO THE SOUTHWEST BUT BY WEDNESDAY THE
LOW WILL MOVE NORTHEASTWARD OVER SOCAL. IT WILL HAVE LITTLE IMPACT
ON CONDITIONS AT THE SURFACE, ALTHOUGH THERE WILL BE MINOR DAY-TO-
DAY DIFFERENCES IN TEMPERATURE. THE RIDGE WILL REBUILD FOR
THURSDAY AND FRIDAY. THE MARINE LAYER WILL PLAY A ROLE IN
AFFECTING TEMPERATURES DEPENDING ON HOW FAR INLAND THE LOW
CLOUDS/FOG SPREAD DURING THE NIGHTS AND MORNINGS AND HOW LONG IT
TAKES FOR THEM TO LIFT EACH MORNING. THE SUBSIDENCE FROM THE HIGH
PRESSURE RIDGE WILL KEEP THE MARINE LAYER INVERSION FAIRLY STRONG
SO CLEARING IS UNLIKELY TO BE VERY EARLY EACH MORNING. DAYTIME
HIGH TEMPERATURES WILL RANGE FROM AROUND 10 DEGREES ABOVE AVERAGE
NEAR THE COAST TO 15 TO 20 DEGREES ABOVE AVERAGE FOR INLAND
AREAS. DAILY MAXIMUM RECORDS MAY BE BROKEN OR TIED IN THE INLAND
AREAS BUT THE MONTHLY RECORDS ARE UNLIKELY TO BE CHALLENGED.
FOR THE WEEKEND INTO EARLY NEXT WEEK...TEMPERATURES WILL TREND
LOWER AND MARINE LAYER CLOUDS AND FOG WILL SPREAD FARTHER INLAND
AS THE HIGH PRESSURE RIDGE WEAKENS AND GETS DISPLACED TO THE
SOUTHEAST AS A LOW PRESSURE TROUGH APPROACHES THE COAST FROM THE
WEST. NEXT MONDAY WILL LIKELY BE THE COOLEST DAY, WITH HIGH
TEMPERATURES MOSTLY 5-10 DEGREES ABOVE SEASONAL AVERAGES.
AVIATION
231800Z...LOW CLOUDS BASED 500-800 FEET MSL RETURN TO THE COASTAL
AREAS AFTER 04Z, MOVING 15 MILES INLAND OVERNIGHT. VIS 2-4 SM OVER
COASTAL HIGHLANDS, PATCHY AREAS OF 5-6 SM FOR THE GENERAL COAST. LOW
CLOUDS CLEAR TO BEACHES 17-18Z TUE. OTHERWISE, MOSTLY CLEAR AND VFR
CONDITIONS WILL PREVAIL INTO TUESDAY.
MARINE
NO HAZARDOUS MARINE CONDITIONS EXPECTED THROUGH FRIDAY.
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...PG
AVIATION/MARINE...CSP
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