370
FXUS66 KSGX 270910
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
110 AM PST FRI FEB 27 2026
SYNOPSIS
HIGH PRESSURE ALOFT AND WEAK OFFSHORE FLOW WILL BRING RECORD-
SETTING HEAT TODAY. A RETURN OF ONSHORE FLOW ON SATURDAY WILL
BEGIN TO SPREAD COOLING INLAND BUT WITH RECORD-SETTING HEAT
CONTINUING FOR MANY AREAS ON SATURDAY. THE COOLING WILL CONTINUE
THROUGH MONDAY, BUT WITH HIGH TEMPERATURES REMAINING ABOVE
AVERAGE. THERE WILL BE STRONGER AND GUSTY WEST WINDS FOR SUNDAY
AND MONDAY AFTERNOON AND EVENING FOR THE MOUNTAINS AND DESERTS
WITH THE STRONGER GUSTS TO 30 TO 40 MPH. A LITTLE WARMER AND
CONTINUED DRY FOR TUESDAY THROUGH THURSDAY OF NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SUNDAY)
SATELLITE IMAGERY SHOWS SOME HIGH CLOUDS SPREADING EASTWARD
ACROSS THE AREA EARLY THIS MORNING WITH THE COASTAL WATERS FREE OF
LOW CLOUDS. HIGH PRESSURE ALOFT AND WEAK OFFSHORE FLOW WILL
CONTINUE THE WARMING TODAY. HIGH TEMPERATURES WILL CONTINUE TO
WARM FROM THOSE ON THURSDAY WITH RECORD OR NEAR-RECORD HIGH
TEMPERATURES FOR MOST AREAS TODAY WITH MANY AREAS HAVING HIGH
TEMPERATURES 20 TO 25 DEGREES ABOVE AVERAGE. HIGH TEMPERATURES FOR
TODAY WILL RANGE FROM AROUND 80 NEAR THE COAST TO THE UPPER 80S
TO MID 90S FOR THE VALLEYS AND INLAND ORANGE COUNTY WITH THE LOWER
DESERTS IN THE MID TO UPPER 90S.
HIGH PRESSURE ALOFT WILL BEGIN TO WEAKEN ON SATURDAY WITH THE
LOWER-LEVEL FLOW BECOMING WEAKLY ONSHORE. THAT ONSHORE FLOW WILL
STRENGTHEN INTO SUNDAY AND MONDAY AS A LOW PRESSURE SYSTEM MOVES
INLAND INTO CALIFORNIA AND INTO THE GREAT BASIN. COOLING WILL
BEGIN TO SPREAD INLAND INTO THE COAST AND VALLEYS ON SATURDAY AND
INTO MOST AREAS ON SUNDAY AND MONDAY WITH THE GREATER COOLING ON
MONDAY. SUNDAY HIGH TEMPERATURES WILL STILL BE AROUND 10 DEGREES
ABOVE AVERAGE NEAR THE COAST TO 15 TO 20 DEGREES ABOVE AVERAGE FOR
INLAND AREAS WITH SUNDAY HIGH TEMPERATURES RANGING FROM THE LOWER
TO MID 70S NEAR THE COAST TO THE LOWER TO MID 80S FOR THE VALLEYS
WITH THE LOWER DESERTS IN THE 90S.
WIDESPREAD RECORD HIGH TEMPERATURES AND RECORD WARM OVERNIGHT
TEMPERATURES ARE EXPECTED FOR TODAY THROUGH SATURDAY NIGHT WITH
THE NEAR RECORD HIGH TEMPERATURES ON SUNDAY MAINLY FOR THE
MOUNTAINS AND DESERTS.
LONG TERM (MONDAY THROUGH THURSDAY)
THE LOW PRESSURE SYSTEM MOVING INLAND THROUGH CALIFORNIA INTO THE
GREAT BASIN WILL CONTINUE THE COOLING INTO MONDAY WITH GUSTY
SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND DESERTS MONDAY
AFTERNOON AND EVENING WITH THE STRONGER GUSTS TO 30 TO 40 MPH.
MONDAY HIGH TEMPERATURES WILL RANGE FROM A FEW DEGREES ABOVE
AVERAGE NEAR THE COAST TO AROUND 10 DEGREES ABOVE AVERAGE FOR THE
LOWER DESERTS. HIGH TEMPERATURES ON MONDAY WILL RANGE FROM THE MID
TO UPPER 60S NEAR THE COAST TO THE UPPER 60S TO MID 70S FOR THE
VALLEYS WITH THE LOWER DESERTS IN THE 80S.
WEAK HIGH PRESSURE WILL FOLLOW FOR TUESDAY WITH A LOW PRESSURE
SYSTEM MOVING INLAND TO THE NORTH ON WEDNESDAY. THIS SYSTEM WILL
MOVE TOWARD THE SOUTHEAST AFTER REACHING THE COAST, BUT WITH
DIFFERENCES ON HOW FAR SOUTH IT WILL GO BEFORE MOVING FARTHER
EAST. HIGH TEMPERATURES ON TUESDAY AND WEDNESDAY WILL BE A FEW
DEGREES WARMER, THEN A FEW DEGREES COOLER ON THURSDAY. NBM SHOWS
INCREASING SPREAD IN THE HIGH TEMPERATURE GUIDANCE FOR THE COAST
AND VALLEYS FOR TUESDAY THROUGH THURSDAY WITH THE GREATER SPREAD
FOR THE DESERTS FOR NEXT THURSDAY AND BEYOND.
AVIATION
280400Z...VFR CONDITIONS PREVAIL AT ALL TAF SITES THROUGH THE
PERIOD. MOSTLY CLEAR SKIES THIS EVENING WITH A FEW HIGH CLOUDS AOA
20,000 FEET MSL. CURRENT MODELS HAVE TRENDED BACK EVEN FURTHER ON
FOG DEVELOPMENT, WITH PATCHY FOG FORMATION LIMITED TO OUT OVER THE
COASTAL WATERS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH MONDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE...VILLAFANE
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