852
FXUS66 KSGX 031709
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
909 AM PST MON NOV 3 2025
SYNOPSIS
A LOW PRESSURE SYSTEM MOVING INLAND TO THE NORTH ON WEDNESDAY WILL
BRING COOLING WITH NIGHT AND MORNING COASTAL LOW CLOUDS SPREADING
FARTHER INTO THE VALLEYS. HIGH PRESSURE ALOFT WILL THEN STRENGTHEN
ACROSS CALIFORNIA FOR NEXT WEEKEND BRINGING WARMING INTO THE
WEEKEND WITH THE MARINE LAYER BECOMING SHALLOWER AND NIGHT AND
MORNING COASTAL LOW CLOUDS NOT SPREADING AS FAR INLAND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
MORNING UPDATE
AN AREA OF WEAK LOW PRESSURE CONTINUES TO PUSH OFF TO THE
NORTHEAST OVER THE DESERT SOUTHWEST THIS MORNING. HIGH CLOUDS ARE
ACCOMPANIED BY THIS SYSTEM, WHICH CAN BE SEEN OVER THE MOUNTAINS
AND DESERTS. LOW CLOUDS CONTINUE TO COVER THE WESTERN VALLEYS AND
COASTAL AREAS, BUT WILL CLEAR OUT BY LATER THIS MORNING. BEACHES
MAY SEE ONLY PARTIAL CLEARING YET AGAIN TODAY. SLIGHTLY COOLER
OUT THERE ACROSS THE WESTERN VALLEYS THIS AFTERNOON WITH CONTINUED
COOLING INTO THE MIDDLE OF THE WEEK.
PREVIOUS DISCUSSION (251 AM MONDAY)
SHORT TERM (TODAY THROUGH WEDNESDAY)
THERE WILL BE COOLING FOR THE INLAND VALLEYS ONTO THE COASTAL
SLOPES OF THE MOUNTAINS TODAY DUE TO STRONGER ONSHORE FLOW AND
DEEPENING OF THE MARINE LAYER FROM A WEAK UPPER LEVEL LOW
PRESSURE CENTER THAT MOVED INLAND THROUGH SOUTHERN CALIFORNIA ON
SUNDAY. THE MARINE LAYER IS NEAR 1200 TO 1500 FEET DEEP WITH
LOWEST VISIBILITIES IN FOG NEAR THE MESAS IN SAN DIEGO COUNTY AND
IN THE WESTERN INLAND EMPIRE.
NOT MUCH CHANGE IS EXPECTED FOR TUESDAY. A LOW PRESSURE SYSTEM
MOVING INLAND ALONG THE WEST COAST TO THE NORTH OF THE AREA ON
WEDNESDAY WILL STRENGTHEN THE ONSHORE FLOW ACROSS SOUTHERN
CALIFORNIA. THIS WILL BRING COOLING OF A FEW DEGREES TO AROUND 5
DEGREES FOR THE VALLEYS ON THE LOWER COASTAL SLOPES OF THE
MOUNTAINS ON WEDNESDAY. HIGH TEMPERATURES ON WEDNESDAY WILL BE A
FEW TO AROUND 5 DEGREES BELOW AVERAGE FOR THE COAST AND VALLEYS
WITH THE DESERTS A FEW TO AROUND 5 DEGREES ABOVE AVERAGE, HIGH
TEMPERATURES ON WEDNESDAY WILL RANGE FROM THE MID 60S TO LOWER 70S
NEAR THE COAST TO THE 70S FOR THE VALLEYS WITH THE MID TO UPPER
80S FOR THE LOWER DESERTS. THE MARINE LAYER WILL DEEPEN TO AROUND
2000 FEET DEEP WITH LOW CLOUDS SPREADING INTO PORTIONS OF THE
INLAND VALLEYS. SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND
DESERTS WILL GUST TO 35 TO 45 MPH FOR WEDNESDAY AFTERNOON AND
NIGHT.
LONG TERM (THURSDAY THROUGH SUNDAY)
ONSHORE FLOW WILL BEGIN TO WEAKEN ON THURSDAY WITH HIGH PRESSURE
ALOFT STRENGTHENING OVER CALIFORNIA FOR NEXT WEEKEND. SLIGHT
WARMING WILL BEGIN ON THURSDAY FOR THE COAST AND VALLEYS. GREATER
WARMING WILL SPREAD INLAND ON FRIDAY WITH SLIGHT ADDITIONAL
WARMING ON SATURDAY AND SLIGHT COOLING ON SUNDAY. HIGH
TEMPERATURES ON SATURDAY WILL BE A FEW DEGREES ABOVE AVERAGE NEAR
THE COAST TO 5 TO 10 DEGREES ABOVE AVERAGE FOR INLAND AREAS. HIGH
TEMPERATURES ON SATURDAY WILL RANGE FROM THE LOWER 70S NEAR THE
COAST TO THE 80S FOR THE VALLEYS WITH THE LOWER DESERTS AROUND 90.
AVIATION
031630Z...COASTS/VALLEYS...CURRENTLY, VIS IN FG AS LOW AS 1/4-1SM IN
INLAND VALLEYS AND THE INLAND EMPIRE WITH SLIGHTLY BETTER VIS 3-5SM
IN WESTERN VALLEYS. LOW CLOUDS BASED AT 700-1200 FEET MSL WILL
GRADUALLY LIFT WITH VIS IMPROVING REGION-WIDE, 17-19Z. PATCHY LOW
CLOUDS TO PERSIST ALONG THE IMMEDIATE COAST. LOW CLOUDS WILL
REDEVELOP AND PUSH BACK ASHORE AFTER 02Z, WITH BASES AROUND 500-900
FEET MSL AND VIS 1-6SM SPREADING A LITTLE FARTHER INLAND BY TUESDAY
MORNING.
MOUNTAINS/DESERTS...VFR CONDITIONS WITH GRADUALLY DECREASING HIGH
CLOUDS TODAY AND TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE 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.
UPDATE...APR
PUBLIC...17
AVIATION/MARINE...WESTERINK
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