083
FXUS66 KSGX 110903
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
203 AM PDT MON MAY 11 2026
SYNOPSIS
HIGH TEMPERATURES FOR TODAY FOR THE DESERTS, MOUNTAINS, AND FAR
INLAND VALLEYS WILL BE 15 TO 20 DEGREES ABOVE AVERAGE. FOR TUESDAY
THROUGH THURSDAY, STRONGER ONSHORE FLOW WILL SPREAD COOLING INLAND
AND DEEPEN THE MARINE LAYER WITH THURSDAY HIGH TEMPERATURES FOR
THE MOUNTAINS, VALLEYS, AND INLAND ORANGE COUNTY AROUND 5 DEGREES
BELOW AVERAGE. THIS WILL BE FOLLOWED BY A WARMING TREND FOR FRIDAY
THROUGH NEXT WEEKEND WITH INLAND HIGH TEMPERATURES FOR NEXT
WEEKEND 5 TO 10 DEGREES ABOVE AVERAGE.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH WEDNESDAY)
HIGH PRESSURE WILL CONTINUE THE WARMING TODAY WITH HIGH
TEMPERATURES FOR THE MOUNTAINS, DESERTS, AND FAR INLAND VALLEYS 15
TO 20 DEGREES ABOVE AVERAGE. HIGH TEMPERATURES FOR TODAY WILL
RANGE FROM AROUND 70 NEAR THE COAST TO THE 90S FOR THE INLAND
EMPIRE WITH 105 TO 110 FOR THE LOWER DESERTS. HIGH PRESSURE ALOFT
WILL BEGIN TO WEAKEN ACROSS SOUTHERN CALIFORNIA ON TUESDAY WITH
LOW PRESSURE MOVING INLAND INTO CALIFORNIA ON WEDNESDAY. COOLING
WILL SPREAD INLAND AND THE MARINE LAYER WILL DEEPEN.
FOR WEDNESDAY, HIGH TEMPERATURES FOR THE DESERTS WILL BE AROUND 5
DEGREES ABOVE AVERAGE WITH THE COAST AND VALLEYS A FEW DEGREES
BELOW AVERAGE. HIGH TEMPERATURES ON WEDNESDAY WILL RANGE FROM THE
MID TO UPPER 60S NEAR THE COAST TO THE MID 70S TO LOWER 80S FOR
THE INLAND EMPIRE WITH THE LOWER DESERTS 95 TO 100.
NIGHT AND MORNING COASTAL LOW CLOUDS WILL SPREAD INLAND INTO
PORTIONS OF THE WESTERN VALLEYS EARLY THIS MORNING, INTO PORTIONS
OF THE INLAND VALLEYS FOR EARLY TUESDAY, AND ACROSS MUCH OF THE
VALLEYS FOR EARLY WEDNESDAY.
LONG TERM (THURSDAY THROUGH SUNDAY)
HIGH TEMPERATURES FOR THURSDAY WILL COOL A FEW MORE DEGREES
FOLLOWED BY WARMING FOR FRIDAY THROUGH NEXT WEEKEND. HIGH
TEMPERATURES AROUND 5 DEGREES BELOW AVERAGE ON THURSDAY FOR THE
MOUNTAINS, VALLEYS, AND INLAND ORANGE COUNTY WILL WARM TO 5 TO 10
DEGREES ABOVE AVERAGE FOR INLAND AREAS FOR NEXT WEEKEND. HIGH
TEMPERATURES FOR NEXT WEEKEND WILL RANGE FROM AROUND 70 NEAR THE
COAST TO THE 80S FOR THE INLAND EMPIRE WITH THE LOWER DESERTS IN
THE UPPER 90S TO 103.
AVIATION
110930Z...COAST/VALLEYS...LOW CLOUDS BASED AT AROUND 800-1200 FEET
MSL WITH TOPS TO 1900 FEET WILL CONTINUE TO SPREAD INTO WESTERN
VALLEYS THROUGH 14Z. INLAND VIS LOCALLY REDUCED 1-5SM. SCATTER OUT
16-18Z. LOW CLOUDS WITH SIMILAR BASES AND VIS TO MOVE ASHORE AFTER
03Z AND SPREAD INTO FAR WESTERN VALLEYS BY TUESDAY MORNING.
OTHERWISE...SKC AND VFR 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...HEAT ADVISORY FROM 10 AM THIS MORNING TO 8 PM PDT THIS EVENING
FOR SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND
EMPIRE.
EXTREME HEAT WARNING UNTIL 8 PM PDT THIS EVENING FOR COACHELLA
VALLEY-SAN DIEGO COUNTY DESERTS-SAN GORGONIO PASS NEAR
BANNING.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE...MM
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