520
FXUS66 KSGX 041759
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1059 AM PDT TUE AUG 4 2026
SYNOPSIS
MODERATE HEATRISK FOR THE MOUNTAINS AND INLAND EMPIRE WILL
CONTINUE THROUGH SATURDAY WITH MAJOR TO LOCALLY MODERATE HEATRISK
FOR THE DESERTS. THERE COULD BE SOME INFLUX OF MONSOONAL MOISTURE
IN SOUTHEAST FLOW ALOFT FOR NEXT SUNDAY AND MONDAY WITH A SLIGHT
CHANCE OF AFTERNOON SHOWERS AND THUNDERSTORMS FOR THE MOUNTAINS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION DISCUSSION
SHORT TERM (TODAY THROUGH THURSDAY)
THE STRENGTH OF HIGH PRESSURE OVER SOUTHERN CALIFORNIA WILL CHANGE
LITTLE THROUGH WEDNESDAY, THEN SLOWLY STRENGTHEN FOR THURSDAY
THROUGH SATURDAY. THERE MAY BE A SHALLOW INFLUX OF LOWER LEVEL
MOISTURE INTO THE LOWER DESERTS FOR TONIGHT AND THURSDAY FROM
OUTFLOW FROM THUNDERSTORMS OVER NORTHERN MEXICO. NIGHTS WOULD BE A
LITTLE WARMER FOR THE LOWER DESERTS AND DAYS A LITTLE COOLER IF
THAT HAPPENS.
HEATRISK WILL DECREASE SLIGHTLY FOR TODAY AND WEDNESDAY, THEN
INCREASE SLIGHTLY FOR THURSDAY THROUGH SATURDAY BUT WILL GENERALLY
BE MODERATE FOR THE INLAND EMPIRE AND FOR THE MOUNTAINS EXCEPT AT
THE HIGHEST ELEVATIONS WITH MAJOR TO OCCASIONALLY MODERATE
HEATRISK FOR THE DESERTS. THE EXTREME HEAT WARNING FOR THE DESERTS
HAS BEEN EXTENDED THROUGH SATURDAY AND A HEAT ADVISORY HAS BEEN
ISSUED FOR THE INLAND EMPIRE AND FOR THE MOUNTAINS FOR TODAY
THROUGH SATURDAY.
HIGH TEMPERATURES THROUGH THURSDAY WILL BE GENERALLY A FEW DEGREES
ABOVE AVERAGE NEAR THE COAST TO 5 TO LOCALLY 10 DEGREES ABOVE
AVERAGE FOR SOME INLAND AREAS. HIGH TEMPERATURES WILL RANGE FROM
THE MID TO UPPER 70S NEAR THE COAST TO THE 90S TO 103 FOR THE
INLAND EMPIRE WITH 110 TO 115 FOR THE LOWER DESERTS.
NIGHT AND MORNING LOW CLOUDS WILL SPREAD INTO COASTAL AREAS LATE
EACH NIGHT.
LONG TERM (FRIDAY THROUGH MONDAY)
SLOW WARMING OF HIGH TEMPERATURES WILL CONTINUE FOR INLAND AREAS
THROUGH SATURDAY WITH HIGH TEMPERATURES ON SATURDAY RANGING FROM
THE MID 70S TO LOWER 80S NEAR THE COAST TO THE MID 90S TO 105 FOR
THE INLAND EMPIRE WITH 112 TO 116 FOR THE LOWER DESERTS.
FOR SUNDAY AND MONDAY, HIGH PRESSURE WILL BEGIN TO SLOWLY WEAKEN
WITH THE FLOW ALOFT BECOMING MORE SOUTHEASTERLY. THIS WOULD ALLOW
FOR SOME ADDITIONAL INFLUX OF MONSOONAL MOISTURE INTO THE AREA.
HIGH TEMPERATURES FOR MONDAY OF NEXT WEEK WOULD BE WITHIN A FEW
DEGREES OF AVERAGE FOR THE COAST, VALLEYS, AND MOUNTAINS AND A
FEW DEGREES ABOVE AVERAGE FOR THE DESERTS. LOW TEMPERATURES WOULD
BE A FEW DEGREES ABOVE AVERAGE FOR THE COAST AND VALLEYS AND 5 TO
10 DEGREES ABOVE AVERAGE FOR THE MOUNTAINS AND DESERTS.
HIGH TEMPERATURES FOR NEXT MONDAY WOULD RANGE FROM THE MID TO
UPPER 70S NEAR THE COAST TO THE 90S FOR THE INLAND EMPIRE WITH 106
TO 110 FOR THE LOWER DESERTS. THERE WILL ALSO BE A SLIGHT CHANCE
OF SHOWERS AND THUNDERSTORMS FOR THE MOUNTAINS FOR SUNDAY
AFTERNOON AND MONDAY AFTERNOON.
AVIATION
041800Z....COASTS/VALLEYS...LOW CLOUDS EVENTUALLY SCATTERING OUT
ALONG COAST BY 20Z, BUT WITH PATCHES PERSISTING. LOW CLOUDS AROUND
1000 FEET MSL WILL REDEVELOP OVER COASTAL AREAS 02-05Z AND INTO
WESTERN VALLEYS OVERNIGHT. INLAND VIS REDUCED 1-5SM. SCATTER OUT
WEDNESDAY 16-17Z.
MOUNTAINS/DESERTS
MOSTLY CLEAR SKIES AND UNRESTRICTED VIS THROUGH
WEDNESDAY MORNING.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...HEAT ADVISORY UNTIL 8 PM PDT SATURDAY FOR RIVERSIDE COUNTY
MOUNTAINS-SAN BERNARDINO COUNTY MOUNTAINS-SAN BERNARDINO
AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SAN DIEGO
COUNTY MOUNTAINS.
EXTREME HEAT WARNING UNTIL 8 PM PDT SATURDAY FOR APPLE AND
LUCERNE VALLEYS-COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
SAN GORGONIO PASS NEAR BANNING.
PZ...NONE.
PUBLIC...MARTIN
AVIATION/MARINE...MM
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