359
FXUS66 KSGX 250957
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
157 AM PST WED FEB 25 2026
SYNOPSIS
WEAK ONSHORE FLOW WILL BRING SLIGHT COOLING TO THE COAST TODAY AND
A POSSIBLE BRIEF RETURN OF LOW CLOUDS AND LOCALLY DENSE FOG NEAR
THE COAST LATE TONIGHT INTO EARLY THURSDAY. FOR THURSDAY AND
FRIDAY, HIGH PRESSURE ALOFT AND WEAK OFFSHORE FLOW WILL BRING
WARMING WITH HIGH TEMPERATURES ON FRIDAY AS MUCH AS 25 TO 30
DEGREES ABOVE AVERAGE FOR PORTIONS OF THE INLAND VALLEYS AND LOWER
COASTAL SLOPES OF THE MOUNTAINS. FOR SATURDAY THROUGH MONDAY,
HIGH PRESSURE ALOFT WILL WEAKEN AND LOWER-LEVEL FLOW WILL BECOME
ONSHORE AND STRENGTHEN. THIS WILL SPREADING COOLING AND HIGHER
COASTAL HUMIDITY INLAND WITH HIGH TEMPERATURES FOR NEXT MONDAY
AROUND 5 DEGREES ABOVE AVERAGE.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH FRIDAY)
SATELLITE IMAGERY SHOWS SOME HIGH CLOUDS SPREADING ACROSS
SOUTHERN CALIFORNIA EARLY THIS MORNING WITH NO COASTAL LOW CLOUDS
AS OF 1 AM. WEAK ONSHORE WILL BRING SLIGHT COOLING OF HIGH
TEMPERATURES TO COASTAL AREAS TODAY AND A POSSIBLE BRIEF RETURN OF
LOW CLOUDS AND LOCALLY DENSE FOG NEAR THE COAST LATE TONIGHT INTO
THURSDAY MORNING.
FOR THURSDAY AND FRIDAY, HIGH PRESSURE ALOFT WILL STRENGTHEN AND
LOWER-LEVEL FLOW WILL GO WEAKLY OFFSHORE. HIGH TEMPERAUTRES FOR
THE COAST, VALLEYS, AND MOUNTAINS WILL WARM AROUND 5 DEGREES ON
THURSDAY AND AROUND ANOTHER 5 DEGREES FOR MOST AREAS ON FRIDAY.
WITH THE WARMING, HIGH TEMPERATURES ON FRIDAY WILL BE AS MUCH AS
25 TO 30 DEGREES ABOVE AVERAGE FOR PORTIONS OF THE INLAND VALLEYS
AND COASTAL SLOPES OF THE MOUNTAINS.
HIGH TEMPERATURES ON FRIDAY WILL RANGE FROM THE MID TO UPPER 70S
NEAR THE COAST TO AROUND 90 FOR THE INLAND VALLEYS WITH THE MID TO
UPPER 90S FOR THE LOWER DESERTS. THERE COULD BE WIDESPREAD RECORD
HIGH TEMPERATURES ON FRIDAY, EXCEPT POSSIBLY AT THE COAST. NBM
PROBABILITIES OF EXCEEDING THE EXISTING HIGH TEMPERATURE RECORDS
ON FRIDAY EXCEED 90 PERCENT FOR CHINO, ONTARIO, RIVERSIDE, AND
RAMONA.
LONG TERM (SATURDAY THROUGH TUESDAY)
HIGH PRESSURE ALOFT WILL WEAKEN AND ONSHORE FLOW WILL RETURN AND
STRENGTHEN ACROSS SOUTHERN CALIFORNIA FOR THE WEEKEND INTO EARLY
NEXT WEEK AS A LOW PRESSURE SYSTEM OVER THE EASTERN PACIFIC
WEAKENS AS IT MOVES TOWARD THE WEST COAST AND INLAND INTO
CALIFORNIA. NBM DAILY CHANCES FOR MEASURABLE PRECIPITATION ARE
HIGHEST FOR NEXT MONDAY AND TUESDAY, BUT REMAIN BELOW 10 PERCENT.
AVIATION
250400Z...VFR CONDITIONS EXPECTED THROUGH THE TAF PERIOD. MOSTLY
CLEAR SKIES WITH HIGH CLOUDS AOA 10,000 FT MSL. LOW CONFIDENCE (20-
30% CHANCE) FOR PATCHY FOG TO DEVELOP OVER THE WATERS OFF THE COAST.
EVEN IF FOG SHOULD DEVELOP, ONLY A 10-20% CHANCE FOR IT TO IMPACT
TAF SITES KSAN/KSNA AFTER 10Z TONIGHT WITH LESS THAN 1SM VIS. PATCHY
FOG SCATTER OUT 16-18Z. LOW CONFIDENCE FOR VERY PATCHY FOG TO
DEVELOP OFFSHORE AGAIN, AROUND 01-03Z THU.
MARINE
NO HAZARDOUS MARINE CONDITIONS EXPECTED THROUGH SUNDAY.
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...WESTERINK
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