389
FXUS66 KSGX 292028
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
128 PM PDT FRI AUG 29 2025
SYNOPSIS
SEASONAL WEATHER WILL CONTINUE THROUGH THE WEEKEND WITH MOSTLY
SUNNY SKIES EXPECTED. MONSOONAL MOISTURE WILL INCREASE AGAIN BY
TUESDAY THROUGH THE END OF THE WEEK, WITH INCREASING CHANCES FOR
STORMS TO RETURN TO THE MOUNTAINS AND DESERTS. OTHER AREAS WILL
SEE SLIGHTLY WARMER CONDITIONS WITH HIGHS UP TO 5 DEGREES ABOVE
NORMAL, WARMEST ON MONDAY AND TUESDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THERE WILL BE CONTINUED DRYING INTO THE WEEKEND WITH MOSTLY CLEAR
SKIES. PWAT VALUES WILL CONTINUE TO LOWER ACROSS THE DESERTS AS
WELL. THIS WILL CONTRIBUTE TO CUMULUS CLOUDS BUILDING ACROSS THE
MOUNTAINS, BUT OTHERWISE, MOST AREAS SHOULD STAY DRY. THE
ATMOSPHERE CONTINUES TO DRY OUT OVER THE WEEKEND WITH PWAT VALUES
LOWERING UNDER ONE INCH ACROSS THE LOWER DESERTS BY THE WEEKEND.
THIS WILL DIMINISH ANY NOTABLE CHANCES FOR STORM ACTIVITY BY THE
WEEKEND WITH CUMULUS FORMING OVER THE MOUNTAINS EACH AFTERNOON.
HIGH PRESSURE WILL BEGIN TO GROW AND EXPAND ACROSS THE REGION BY
SUNDAY INTO EARLY NEXT WEEK FOR AREAS AWAY FROM THE COAST. NBM
50-75TH PERCENTILE SHOWS HIGHS AROUND 5 DEGREES ABOVE NORMAL FOR
INLAND AREAS WITH HEAT PEAKING BY LABOR DAY INTO TUESDAY. HIGHS
WILL BE GENERALLY BE NEAR 100 TO 105 DEGREES ACROSS THE INLAND
EMPIRE, WELL INTO THE 90S FOR THE OC/SD VALLEYS, AND NEAR 110
DEGREES ACROSS THE COACHELLA VALLEY AND ANZA-BORREGO DESERT. THIS
WILL BRING WIDESPREAD MODERATE HEAT RISK ACROSS THE REGION, WHERE
RELIEF FROM THE HEAT WILL BE MORE DIFFICULT FOR VULNERABLE
POPULATIONS AND THOSE WITHOUT COOLING METHODS.
MONSOONAL MOISTURE WILL INCREASE AGAIN BY LABOR DAY INTO THE MIDDLE
OF NEXT WEEK, WHICH WILL LEAD TO A GREATER CHANCE OF SHOWER AND
THUNDERSTORMS ACROSS THE MOUNTAINS AND DESERTS. BY TUESDAY THROUGH
AT LEAST FRIDAY, CHANCES HAVE INCREASED TO NEAR 30-45% ACROSS THESE
AREAS. HIGH PRESSURE WILL WEAKEN SOMEWHAT LATER NEXT WEEK, WHICH
WILL HELP STEER MONSOONAL FLOW AWAY FROM THE REGION, LOWERING THE
CHANCES OF STORMS. OTHER AREAS WILL SEE HIGHS NEAR TO SLIGHTLY ABOVE
AVERAGE WITH DRY WEATHER WITH A SUBTLE COOLING TREND INTO THE LATTER
HALF OF THE WEEK. COASTAL AREAS CAN EXPECT TO SEE PATCHY LOW
CLOUDS NEAR THE COAST EACH NIGHT AND MORNING BY NEXT WEEK AS WELL.
AVIATION
292000Z...VFR THROUGH TONIGHT REGION-WIDE. VERY PATCHY COASTAL LOW
CLOUDS BASED AT 800 FEET AFTER 10Z SATURDAY ALONG THE SD COUNTY
COAST.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH TUESDAY.
BEACHES... A LONG-PERIOD SOUTHERLY SWELL WILL BRING ELEVATED SURF
SUNDAY THROUGH MONDAY. SURF OF 3-6 FEET WITH OCCASIONAL SETS TO 7
FEET WILL PRESENT A HIGH RIP CURRENT RISK. BEACH HAZARD STATEMENT
GOES INTO LATE MONDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...BEACH HAZARDS STATEMENT FROM LATE TONIGHT THROUGH MONDAY EVENING
FOR ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL
AREAS.
PZ...NONE.
PUBLIC...APR
AVIATION/MARINE...WESTERINK
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