616
FXUS66 KSGX 191727
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1027 AM PDT THU MAR 19 2026
SYNOPSIS
WIDESPREAD MODERATE WITH AREAS OF MAJOR HEATRISK WILL CONTINUE
THROUGH FRIDAY. HEATRISK WILL DECREASE FOR THE WEEKEND, WITH MINOR
COOLING. EVEN WITH THE COOLING, TEMPERATURES WILL REMAIN ABOVE
AVERAGE INTO NEXT WEEK. PATCHY MARINE LAYER LOW CLOUDS AND FOG WILL
BE PRESENT AT TIMES, MOST LIKELY TO IMPACT THE COASTAL WATERS AND
IMMEDIATE COAST.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
MULTIPLE DAILY AND MONTHLY HIGH AND LOW TEMPERATURE RECORDS WERE
BROKEN YESTERDAY WITH MORE EXPECTED TO BE BROKEN TODAY AND FRIDAY.
THE LATEST RECORD REPORT IS HEADLINED ON OUR WEATHER.GOV/SANDIEGO
HOMEPAGE. A CLIMATE SECTION CAN BE FOUND BELOW LISTING LOCATIONS
THAT ARE CURRENTLY FORECAST TO TIE OR BREAK THEIR MONTHLY RECORDS.
WIDESPREAD MODERATE TO LOCALLY MAJOR HEATRISK IS EXPECTED THROUGH
FRIDAY FOR MOST LOCATIONS AND SATURDAY IN THE LOW DESERT. REDUCE
OUTDOOR ACTIVITIES IF POSSIBLE BETWEEN 10 AM AND 5 PM, SEEK SHADE,
AND STAY HYDRATED.
THE HIGH PRESSURE ALOFT WILL PEAK IN STRENGTH OVER THE
CALIFORNIA/ARIZONA BORDER TODAY WITH TEMPERATURES 20 TO 30 DEGREES
ABOVE AVERAGE FOR THIS TIME OF YEAR. OVERNIGHT LOWS WILL ALSO BE
ELEVATED, WHICH WILL LIMIT OVERNIGHT RELIEF FROM THE HEAT FOR MOST
INLAND LOCATIONS. THROUGH FRIDAY WIDESPREAD TEMPERATURES IN THE 90S
TO LOW 100S EXPECTED FOR THE INLAND VALLEYS, WITH HIGHS IN THE MID-
80S TO LOW 90S FOR COASTAL AREAS AWAY FROM THE IMMEDIATE COAST AND
THE LOWER ELEVATIONS OF THE MOUNTAINS. IN THE LOW DESERTS, HIGHS
WILL LIKELY EXCEED 105 DEGREES IN MOST LOCATIONS THROUGH SATURDAY.
CHANCES FOR EXCEEDING 110 DEGREES ON FRIDAY ARE 60 PERCENT FOR
INDIO, 20 PERCENT FOR PALM SPRINGS, AND 10 PERCENT FOR BORREGO
SPRINGS. IN THE HIGH DESERT, TEMPERATURES WILL BE IN THE MID-90S.
WEAKENING HIGH PRESSURE ALOFT AND STRENGTHENING ONSHORE FLOW WILL
BRING 4 TO 8 DEGREES OF COOLING SATURDAY. THAT WILL BE MOST
NOTICEABLE FOR LOCATIONS WEST OF THE MOUNTAINS, BUT EVEN THE DESERTS
WILL COOL 3 TO 5 DEGREES. A WEAK LOW PRESSURE SYSTEM ALOFT WILL MOVE
EAST THROUGH SOUTHERN CALIFORNIA INTO THE GREAT BASIN SOMETIME
SUNDAY OR MONDAY. THAT WILL BRING AN UPTICK IN WESTERLY WINDS
SATURDAY, WHICH HAVE THE POTENTIAL TO TURN WEAKLY OFFSHORE BY SUNDAY
AFTERNOON INTO MONDAY MORNING. RIDGING ALOFT LOOKS TO REBUILD MONDAY
AND STRENGTHEN INTO THE MIDDLE OF THE WEEK. THIS RIDGE ISN'T EXPECTED
TO BE AS STRONG AS THE ONE OVER SOUTHERN CALIFORNIA THIS WEEK, BUT
IT WILL BE ENOUGH TO MAINTAIN ABOVE AVERAGE TEMPERATURES THROUGH
NEXT THURSDAY. WIDESPREAD MINOR WITH AREAS OF MODERATE HEATRISK WILL
BE PRESENT IN THE VALLEYS AND LOW DESERT FOR MUCH OF NEXT WEEK.
WITH THE RIDGE AXIS SHIFTED FURTHER EAST TODAY, WEAK ONSHORE FLOW
HAS RETURNED TO COASTAL AREAS. THE WEAK ONSHORE FLOW WAS ENOUGH TO
ALLOW PATCHY DENSE FOG ALONG THE IMMEDIATE COAST THIS MORNING. AREAS
OF PATCHY DENSE FOG OVER THE WATER AND AT THE COAST IS POSSIBLE EACH
MORNING THROUGH SATURDAY. WITH THE AFOREMENTIONED PASSING WEAK LOW
PRESSURE ONSHORE FLOW WILL BRIEFLY INCREASE, MAKING CHANCES OF DENSE
FOG LESS LIKELY FOR SUNDAY MORNING. LOW CLOUD AND FOG COVERAGE ON
SUNDAY MORNING MAY REACH INTO THE WESTERN VALLEYS. WEAK OFFSHORE
FLOW EARLY NEXT WEEK MAY KEEP LOW CLOUDS AND FOG PATCHY AND MORE
CONFINED TO THE IMMEDIATE COAST AGAIN.
AVIATION
191800Z...LOW CLOUDS AND FOG HAVE MOVED OFFSHORE WITH VFR CONDITIONS
EXPECTED THROUGH 03Z FRIDAY. LOW CLOUDS AND PATCHY FOG WILL MAKE ITS
RETURN ALONG THE COAST BEGINNING AFTER 03Z FRIDAY NEAR KSAN, TOUCHING
INTO OTHER COASTAL TAF SITES AFTER 06Z-07Z. HIGHEST IMPACTS ARE
EXPECTED AT KSAN AT THIS TIME WITH CLEARING 16Z-17Z. EVERYWHERE
ELSE, VFR CONDITIONS EXPECTED THROUGH THE TAF PERIOD.
MARINE
STILL SOME PATCHY FOG OUT OVER THE LOCAL WATERS THIS
MORNING, BUT IS MAKING A SLOW RETREAT TO THE OUTER WATERS. EXPECT
PATCHY FOG DEVELOPMENT IN THE LATE AFTERNOON TO EARLY EVENING HOURS
BUT NOT EXPECTING IT TO BE DENSE AT THIS TIME. OTHERWISE, NO
HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH TUESDAY.
CLIMATE
HERE ARE A LIST OF LOCATIONS CURRENTLY FORECAST TO BREAK/TIE
MONTHLY HIGH TEMPERATURE RECORDS WEDNESDAY THROUGH FRIDAY:
TODAY:
FORECAST HIGH RECORD YEAR AVG +/-
RAMONA 95 92 IN 1997 68 28 MONTHLY RECORD: 94
BIG BEAR LAKE 82 70 IN 1997 52 28 MONTHLY RECORD: 80
IDYLLWILD 91 77 IN 1997 60 27 MONTHLY RECORD: 82
PALOMAR MOUNTAIN 88 76 IN 2007 57 28 MONTHLY RECORD: 82
LAKE CUYAMACA 88 79 IN 1956 56 30 MONTHLY RECORD: 82
CAMPO 97 87 IN 1997 69 26 MONTHLY RECORD: 92
PALM SPRINGS 107 97 IN 1997 80 29 MONTHLY RECORD: 104
INDIO 108 98 IN 1997 81 28 MONTHLY RECORD: 104
THERMAL 108 101 IN 1997 82 29 MONTHLY RECORD: 103
BORREGO 107 95 IN 2017 80 24 MONTHLY RECORD: 101
FRIDAY:
FORECAST HIGH RECORD YEAR AVG +/-
RAMONA 96 92 IN 1997 68 28 MONTHLY RECORD: 94
BIG BEAR LAKE 80 72 IN 2004 52 29 MONTHLY RECORD: 80
IDYLLWILD 88 79 IN 2004 60 27 MONTHLY RECORD: 82
PALOMAR MOUNTAIN 87 76 IN 1972 57 29 MONTHLY RECORD: 82
LAKE CUYAMACA 88 75 IN 2004 56 32 MONTHLY RECORD: 82
CAMPO 97 92 IN 1997 69 27 MONTHLY RECORD: 92
PALM SPRINGS 109 98 IN 2004 80 31 MONTHLY RECORD: 104
INDIO 109 100 IN 2004 81 31 MONTHLY RECORD: 104
THERMAL 110 101 IN 2004 82 32 MONTHLY RECORD: 103
BORREGO 108 97 IN 1997 80 26 MONTHLY RECORD: 101
HERE ARE A LIST OF LOCATIONS CURRENTLY FORECAST TO BREAK/TIE
MONTHLY HIGHEST LOW TEMPERATURE RECORDS WEDNESDAY THROUGH FRIDAY:
FRIDAY:
FORECAST LOW RECORD YEAR
RIVERSIDE 68 58 IN 1995 MONTHLY RECORD: 66
LAKE ELSINORE 63 57 IN 1940 MONTHLY RECORD: 61
ALPINE 71 58 IN 2001 MONTHLY RECORD: 63
IDYLLWILD 64 45 IN 2017 MONTHLY RECORD: 50
LAKE CUYAMACA 65 51 IN 2017 MONTHLY RECORD: 55
PALM SPRINGS 76 69 IN 1932 MONTHLY RECORD: 70
THERMAL 71 68 IN 1989 MONTHLY RECORD: 69
BORREGO 72 65 IN 2017 MONTHLY RECORD: 70
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 FRIDAY FOR ORANGE COUNTY COASTAL
AREAS-ORANGE COUNTY INLAND AREAS-RIVERSIDE COUNTY MOUNTAINS-
SAN BERNARDINO COUNTY MOUNTAINS-SAN BERNARDINO AND
RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SAN DIEGO COUNTY
COASTAL AREAS-SAN DIEGO COUNTY MOUNTAINS-SAN DIEGO COUNTY
VALLEYS-SANTA ANA MOUNTAINS AND FOOTHILLS.
EXTREME HEAT WARNING UNTIL 8 PM PDT SATURDAY FOR COACHELLA
VALLEY-SAN DIEGO COUNTY DESERTS-SAN GORGONIO PASS NEAR
BANNING.
PZ...NONE.
PUBLIC/CLIMATE...CO
AVIATION/MARINE...VILLAFANE
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