021
FXUS66 KSGX 150454
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
954 PM PDT TUE JUL 14 2026
SYNOPSIS
ABOVE AVERAGE HIGH AND LOW TEMPERATURES FROM COAST TO THE DESERTS
THROUGH THURSDAY. SHOWERS AND THUNDERSTORMS POSSIBLE THIS AFTERNOON
OVER THE MOUNTAINS AND LOCALLY INTO THE HIGH DESERT. VERY LIMITED
THUNDERSTORM CHANCES FOR WEDNESDAY. HIGH TEMPERATURES WILL COOL TO
WITHIN A FEW DEGREES OF AVERAGE, WITH LOWS EXPECTED TO REMAIN A FEW
DEGREES ABOVE AVERAGE THROUGH THE WEEKEND. MONSOONAL MOISTURE WILL
INCREASE FOR THURSDAY THROUGH THE WEEKEND WITH CHANCES OF AFTERNOON
SHOWERS AND THUNDERSTORMS MAINLY OVER THE MOUNTAINS AND DESERTS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION DISCUSSION
HIGH PRESSURE ALOFT WILL KEEP BOTH HIGH AND LOW TEMPERATURES ABOVE
AVERAGE THROUGH THURSDAY. TODAY WILL SEE ADDITIONAL CHANCES OF
SHOWERS AND THUNDERSTORMS MAINLY CONFINED TO THE MOUNTAINS WITH THE
POTENTIAL FOR SHOWERS/THUNDERSTORMS TO DRIFT INTO THE HIGH DESERT.
OVERALL RAINFALL RATES WILL BE LESS THAN 0.50", WITH ONLY A 10
PERCENT CHANCE OF RAINFALL RATES EXCEEDING 0.50". THUNDERSTORM
CHANCES DECREASE INTO WEDNESDAY AS THE HEAT PEAKS.
HIGH TEMPERATURES ON WEDNESDAY WILL BE MOSTLY 5 TO 10 DEGREES ABOVE
AVERAGE. LOW TEMPERATURES ON WEDNESDAY WILL BE AROUND 5 TO 8 DEGREES
ABOVE AVERAGE, UP TO 10 TO 15 DEGREES ABOVE AVERAGE ON MOUNTAIN
FOOTHILLS AND SLOPES. THE WARM NIGHTS WILL CONTRIBUTE MORE TO THE
HIGHER HEATRISK FOR THE NEXT FEW DAYS. THE DAYTIME HEAT WILL BE
MOSTLY NOT RECORD SETTING. HOWEVER, THERE COULD BE A FEW RECORDS
TIED OR BROKEN IN THE MOUNTAINS FOR RECORD WARM LOW TEMPERATURES.
AFTER A DECREASE IN MID-LEVEL MOISTURE WEDNESDAY, PRECIPITABLE WATER
VALUES WILL BEGIN INCREASING AGAIN ON THURSDAY WITH THE HIGHER
VALUES FOR FRIDAY THROUGH NEXT WEEKEND.
FOR EARLY NEXT WEEK, THE UPPER LEVEL RIDGE OF HIGH PRESSURE WILL
START TO DRIFT SOUTH AND WEST MORE OVER THE FOUR CORNERS REGION.
THIS WILL LEAVE THE DOOR FOR MONSOONAL MOISTURE OPEN, KEEPING DAILY
CHANCES FOR AFTERNOON SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS,
LOCALLY INTO THE DESERTS. HIGH TEMPERATURES WILL REMAIN NEAR NORMAL,
WITH LOW TEMPERATURES EXPECTED TO REMAIN ABOVE AVERAGE.
AVIATION
150500Z....COAST/VALLEYS...SKC AND VFR CONDITIONS EXPECTED THROUGH
EARLY WEDNESDAY MORNING. AREAS OF LOW CLOUDS BASED 600-1000 FT MSL
ARE EXPECTED TO DEVELOP OVER COASTAL SAN DIEGO COUNTY 10-12Z WED.
PATCHY CLOUDS MAY BRIEFLY DEVELOP OVER COASTAL ORANGE COUNTY AFTER
12Z. MINOR VIS REDUCTIONS (1-5SM) EXPECTED FOR ELEVATED COASTAL
TERRAIN AND WESTERN VALLEYS (I-15 CORRIDOR). LOW CLOUDS SCATTER BACK
TO THE COAST BY 15-16Z. OTHERWISE, VFR CONDITIONS PREVAIL WITH FEW
HIGH CLOUDS ABOVE 10 KFT WEDNESDAY AFTERNOON.
MOUNTAINS/DESERTS...SCT CU BASED AROUND 10,000 FT ALONG WITH ISOLD
SHRA OVER MOUNTAIN RIDGES WEDNESDAY AFTERNOON. OTHERWISE, FEW-SCT
HIGH CLOUDS AOA 15,000 FT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY.
BEACHES
ASTRONOMICAL HIGH TIDES PEAKING 7.0-7.5 FT CURRENTLY WILL PEAK AGAIN
AROUND 6.5-7.0 FEET WEDNESDAY EVENING. HIGH TIDES COMBINE WITH A
MODEST SOUTH SWELL (2 FT SWELL AT 13-15 SECONDS FROM 190 DEGREES) TO
GENERATE SURF OF 3-5 FT FOR SOUTH-FACING BEACHES AND 2-4 FT
ELSEWHERE. THIS WILL PRODUCE AREAS OF COASTAL FLOODING IN LOW LYING
AREAS, BOARDWALKS, BEACH PARKING LOTS, AND BEACH ADJACENT STREETS
DURING EVENING HIGH TIDES. A BEACH HAZARDS STATEMENT REMAINS IN
EFFECT THROUGH WEDNESDAY EVENING AND CONTAINS FURTHER DETAILS. THERE
WILL BE AN INCREASED RISK OF RIP CURRENTS THROUGH WEDNESDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...BEACH HAZARDS STATEMENT THROUGH WEDNESDAY EVENING FOR ORANGE
COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.
HEAT ADVISORY FROM 10 AM WEDNESDAY TO 8 PM PDT THURSDAY FOR
ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.
EXTREME HEAT WARNING FROM 10 AM WEDNESDAY TO 8 PM PDT THURSDAY
FOR ORANGE COUNTY INLAND AREAS-RIVERSIDE COUNTY MOUNTAINS-
SAN BERNARDINO COUNTY MOUNTAINS-SAN BERNARDINO AND
RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SAN DIEGO COUNTY
MOUNTAINS-SAN DIEGO COUNTY VALLEYS-SAN GORGONIO PASS NEAR
BANNING-SANTA ANA MOUNTAINS AND FOOTHILLS.
EXTREME HEAT WARNING UNTIL 8 PM PDT THURSDAY FOR COACHELLA
VALLEY-SAN DIEGO COUNTY DESERTS.
PZ...NONE.
PUBLIC...CO
AVIATION/MARINE/BEACHES...KW
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