805
FXUS66 KSGX 260507
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
907 PM PST WED FEB 25 2026
SYNOPSIS
ONSHORE FLOW THROUGH THURSDAY MORNING WILL ALLOW FOR THE RETURN OF
PATCHY LOW CLOUDS AND FOG AT THE COAST TONIGHT. STRONG RIDGING IN
COMBINATION WITH WEAK OFFSHORE FLOW WILL CREATE WELL ABOVE AVERAGE
TEMPERATURES FOR THURSDAY THROUGH SATURDAY. FRIDAY WILL BE THE
WARMEST DAY WITH RECORD HIGHS LIKELY FOR SEVERAL INLAND VALLEY
LOCATIONS. ON SATURDAY, WINDS TURN BACK ONSHORE AND THE RIDGE BEGINS
TO WEAKEN AS A WEAK UPPER LOW APPROACHES FROM THE WEST. THIS WILL
ALLOW FOR INCREASING CLOUD COVER AND A RETURN TO NEAR NORMAL
TEMPERATURES BY EARLY NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
NO SIGNIFICANT CHANGES TO THE FORECAST THIS EVENING AS THE RIDGE
OF HIGH PRESSURE REMAINS OVER THE WESTERN U.S. SOME LOW CLOUDS AND PATCHY
FOG HAS DEVELOPED ALONG THE SAN DIEGO COUNTY COASTLINE, BUT
CONDITIONS REMAIN ISOLATED AT THIS TIME, ALBEIT WITH SOME LIMITED
CHANCES FOR DEVELOPMENT THROUGH THE OVERNIGHT HOURS.
PREVIOUS DISCUSSION FROM 115 PM PST WEDNESDAY FEBRUARY 25, 2026...
HIGH CLOUDS IN THE CURRENT VISIBLE SATELLITE LOOP DEPICT A BROAD
UPPER RIDGE OVER THE WESTERN CONUS. A SHORTWAVE TROUGH PASSING
WELL TO THE NORTH WILL GO ALMOST UNNOTICED ACROSS THE AREA, WITH
JUST ENOUGH FORCING FOR WESTERLY WIND GUSTS 25-35 MPH ACROSS THE
HIGH DESERT AND THROUGH MOUNTAIN PASSES THIS EVENING. ALSO,
INCREASED ONSHORE FLOW PRESENTS A 50-60% CHANCE FOR LOW CLOUDS
(AND FOG) TO FINALLY RETURN OVER COASTAL WATERS AND COASTAL LAND
AREAS TONIGHT.
THE MAIN STORY IN THE NEAR TERM IS THE TEMPERATURES, WHICH ARE
EXPECTED TO RUN WELL ABOVE NORMAL THROUGH SATURDAY. THE UPPER
RIDGE WILL CONTINUE TO STRENGTHEN THROUGH FRIDAY WITH ITS AXIS
CENTERED RIGHT OVER SOUTHERN CALIFORNIA. CONCURRENTLY, WEAK
OFFSHORE FLOW WILL DEVELOP FOR THURSDAY INTO FRIDAY. THIS WILL
ALLOW TEMPERATURES TO SOAR 10 TO 25 DEGREES ABOVE NORMAL AREA
WIDE THURSDAY THROUGH SATURDAY (LOCALLY 25 TO 30 DEGREES ABOVE
NORMAL FOR INLAND VALLEYS AND COASTAL SLOPES). FRIDAY WILL BE THE
HOTTEST DAY WITH MULTIPLE RECORDS SET TO FALL ACROSS THE INLAND
VALLEYS AND MOUNTAINS. TEMPERATURES IN THE UPPER 80S TO LOW 90S
FOR INLAND VALLEYS, 70S AND 80S IN THE MOUNTAINS, AND MID TO
UPPER 90S FOR THE LOW DESERTS. WELL ABOVE AVERAGE TEMPERATURES
LINGER THROUGH SATURDAY, BUT THE RETURN OF ONSHORE FLOW AND A
WEAKENING RIDGE SHOULD KNOCK TEMPS DOWN A FEW DEGREES RELATIVE TO
FRIDAY.
ONSHORE FLOW STRENGTHENS AND THE RIDGE WEAKENS FURTHER BY SUNDAY
AS A WEAK UPPER LOW PUSHES IN FROM THE WEST. THIS WILL BRING
BREEZY CONDITIONS FOR THE MOUNTAINS AND DESERTS, AN INCREASE IN
CLOUD COVER, AND A RETURN TO NEAR NORMAL TEMPERATURES BY EARLY
NEXT WEEK. GUIDANCE VARIES SOME ON THE EXACT TRACK OF THE LOW, BUT
MOST SOLUTIONS REMAIN DRY AS THE LOW PASSES THROUGH. CHANCES FOR
MEASURABLE PRECIP REMAIN BELOW 15 PERCENT THROUGH EARLY NEXT
WEEK.
MODELS DIVERGE QUICKLY BY MID NEXT WEEK, BUT THERE IS THERE IS
SOME INDICATION OF WEAK TROUGHING WITH ANOTHER LOW PRESSURE
SYSTEM AFFECTING THE WEST COAST LATE NEXT WEEK. WHETHER OR NOT
SOUTHERN CALIFORNIA IS AFFECTED REMAINS TO BE SEEN.
AVIATION
260400Z...COAST...PATCHY FG TO LOWER VIS BELOW 1SM AT TIMES FOR
COASTAL SITES AFTER 10Z TONIGHT. MOST LIKELY TIMEFRAME FOR VIS DOWN
TO 1/4SM AROUND 11-15Z A FEW MILES INLAND, INCLUDING KSAN/KCRQ/KSNA.
CIGS AROUND 200-500 FEET MSL. LOCALIZED AREAS OF VALLEY FG AS WELL
FOR INLAND AREAS OVERNIGHT WITH NEAR ZERO VIS. CLEARING AFTER 16Z
BUT PATCHY STRATUS MAY LINGER AT THE BEACHES INTO THE EARLY
AFTERNOON. THURSDAY EVENING, LOW CONFIDENCE AND LOW CHANCES (20-30%)
FOR FG TO MOVE INTO COASTAL AREAS.
INLAND VALLEYS/MTNS/DESERTS...VFR CONDITIONS THROUGH THROUGH THE
PERIOD FOR INLAND AREAS WITH SKC-FEW250.
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...SUK
AVIATION/MARINE...WESTERINK
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page