954
FXUS66 KMTR 260014
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
514 PM PDT WED JUN 25 2025
..NEW AVIATION, MARINE
SYNOPSIS
ISSUED AT 200 PM PDT WED JUN 25 2025
A SEASONAL LATE JUNE WEATHER PATTERN CONTINUES INTO THURSDAY WITH
A WELL ESTABLISHED MARINE LAYER ALONG THE COAST, SPREADING LOW
CLOUDS AND FOG INLAND NIGHT AND MORNING HOURS. TEMPERATURES
RUNNING NEAR OR SLIGHTLY BELOW NORMAL INLAND BUT FORECAST TO WARM
INTO THE 90S FOR SOME OF THE INTERIOR VALLEYS FRIDAY AND
SATURDAY. A WEAK UPPER LOW OFF THE COAST SUNDAY THROUGH EARLY NEXT
WEEK WILL KEEP ONSHORE FLOW AND SEASONAL TEMPERATURES IN PLACE.
SHORT TERM
(THIS EVENING THROUGH THURSDAY)
ISSUED AT 200 PM PDT WED JUN 25 2025
FOR THE MOST PART LOW CLOUDS HAVE CLEARED BACK TO THE COAST WITH
ONLY THE USUAL DREARY SPOTS SUCH AS PT REYES, OCEAN BEACH AND THE
MONTEREY PENINSULA HOLDING ONTO LOW CLOUDS WITH CONTINUED
NORTHWESTERLY ONSHORE WINDS. TEMPERATURES ARE RANGING FROM THE
UPPER 50S SF/HALF MOON BAY TO 60/70S AROUND THE BAY AND 80S INLAND
WITH PLENTY OF SUNSHINE THIS AFTERNOON. HOWEVER NO REAL HOT
WEATHER TO SPEAK OF WITH ONLY LOWER 90S FOR INTERIOR MONTEREY
COUNTY. THE MARINE LAYER LOOKS TO BE AROUND 1800 FEET AND SHOULD
SPREAD INLAND ONCE AGAIN THIS EVENING AND OVERNIGHT.
LONG TERM
(THURSDAY NIGHT THROUGH NEXT TUESDAY)
ISSUED AT 1254 PM PDT WED JUN 25 2025
AN INLAND WARMING TREND SHOULD OCCUR ON FRIDAY AS 850 MB TEMPS
WARM TO AROUND 21-22 CELSIUS. PLACES LIKE LIVERMORE AND CONCORD
SHOULD WARM INTO THE LOW/MID 90S WITH SOME LOCAL NORTHERLY WINDS
OFF MT SAINT HELENA HELPING SANTA ROSA WITH A QUICK UPTICK IN HIGH
TEMPS FOR FRIDAY AFTERNOON. STILL EXPECT THE MARINE LAYER TO HOLD
STEADY ALONG THE COAST KEEPING THE COAST AND BAYS MILD. INTERIOR
TEMPS STAY IN THE LOWER/MID 90S SATURDAY WITH NO BIG CHANGES IN
THE SYNOPTIC PATTERN.
BY SUNDAY A WEAK LOW OFF THE COAST WILL INDUCE SOME SOUTHERLY
WINDS THAT WILL BRING COOLER CONDITIONS TO THE NORTH BAY VALLEYS
AND THE INTERIOR HIGHS WILL LIKELY DROP IN THE UPPER 80S (VS 90S)
EXCEPT INTERIOR MONTEREY COUNTY. THE UPPER LOW WILL LIKELY
LIFT/DEEPEN THE MARINE LAYER ON SUNDAY WITH SOME MORNING DRIZZLE.
THAT FEATURE MAY INDUCE ENOUGH LIFT AND DIVERGENT FLOW OVER
NORTHEAST CALIFORNIA TO INDUCE AFTERNOON CONVECTION BUT THAT WOULD
BE OUTSIDE OF OUR AREA PERHAPS AS CLOSE AS THE COASTAL MOUNTAINS
IN MENDOCINO COUNTY AND POINTS NORTHWARD. LONG RANGE FORECAST
UNCERTAINTY WILL DEAL WITH HOW THAT WEAK UPPER CIRCULATION
EVOLVES. THE DETERMINISTIC ECMWF CUTS THE FEATURE OFF AS A WEAK
CUT-OFF LOW WEST OF THE CENTRAL COAST THAT WOULD KEEP TEMPS NEAR
OR SLIGHTLY BELOW NORMAL FOR THE FIRST WEEK OF JULY AND INTO THE
JULY 4TH HOLIDAY WEEKEND. MODEL CONSENSUS AT THIS TIME SHOWS NO
BIG HEAT DOME OVER THE WEST AND ANY MONSOON MOISTURE STAYING
CONFINED TO THE SOUTHERN SIERRA AND DESERTS OF SOCAL THROUGH THE
HOLIDAY WEEKEND.
AVIATION
(00Z TAFS)
ISSUED AT 514 PM PDT WED JUN 25 2025
ONSHORE WINDS ARE BEGINNING TO USHER STRATUS AND FOG INLAND. THE
MARINE LAYER HAS MORE RECENTLY COMPRESSED, VARYING IN DEPTH FROM
1100 TO 1400 FEET. STRATUS AND FOG /IFR/ MOVE INLAND TONIGHT AND
THURSDAY MORNING THEN MIX OUT TO NEAR THE COASTLINE LATE MORNING
AND AFTERNOON THURSDAY.
VICINITY OF SFO...A WEST WIND IS BEGINNING TO USHER STRATUS /MVFR/
CEILING TO SFO AIRPORT, THE CEILING WILL GRADUALLY LOWER TO IFR
BY MID TO LATE EVENING. IFR TONIGHT AND THURSDAY MORNING, STRATUS
THEN MIXES OUT TO VFR BY LATE THURSDAY MORNING. A SLIGHTLY STRONGER
NORTHERLY ACV-SFO PRESSURE GRADIENT AND WIND THURSDAY MAY HELP DELAY
ANY POTENTIAL STRATUS INTRUSION THURSDAY EVENING.
SFO BRIDGE APPROACH...SIMILAR TO SFO.
MONTEREY BAY TERMINALS...STRATUS /IFR/ IS MOVING INLAND, IFR
TONIGHT AND THURSDAY MORNING. STRATUS MIXES OUT TO MVFR-VFR BY
LATE THURSDAY MORNING AND AFTERNOON. EARLY TO MID EVENING ONSHORE
WINDS 10 TO 20 WITH A FEW GUSTS TO 25 KNOTS, WINDS EASING TO 5 TO
10 KNOTS TONIGHT AND THURSDAY MORNING, THEN INCREASING TO 10 TO 20
KNOTS THURSDAY AFTERNOON.
MARINE
(TONIGHT THROUGH NEXT MONDAY)
ISSUED AT 450 PM PDT WED JUN 25 2025
FRESH TO STRONG NORTHWESTERLY BREEZES WITH NEAR-GALE FORCE GUSTS
WILL PREVAIL THROUGH THE REMAINDER OF THE WEEK. GALE FORCE GUSTS
CAN BE EXPECTED NEAR THE COASTAL JET REGIONS OF POINT REYES AND
POINT SUR ON THURSDAY AFTERNOON AND EVENING. MODERATE TO ROUGH
SEAS WILL PREVAIL THROUGH THE WEEK. NORTHWESTERLY WINDS WILL EASE
OVER THE WEEKEND.
MTR WATCHES/WARNINGS/ADVISORIES
CA...COASTAL FLOOD ADVISORY FROM 9 PM THIS EVENING TO 2 AM PDT
THURSDAY FOR CAZ006-506-508.
PZ...SMALL CRAFT ADVISORY FROM 9 AM TO 9 PM PDT THURSDAY FOR MRY BAY.
SMALL CRAFT ADVISORY UNTIL 9 AM PDT THURSDAY FOR PT ARENA TO PT
REYES 0-10 NM.
GALE WARNING FROM 9 AM TO 9 PM PDT THURSDAY FOR PT ARENA TO PT
REYES 0-10 NM.
SMALL CRAFT ADVISORY UNTIL 3 AM PDT FRIDAY FOR PIGEON PT TO PT
PINOS 10-60 NM-PT ARENA TO PT REYES 10-60 NM-PT REYES TO
PIGEON PT 0-10 NM.
SMALL CRAFT ADVISORY UNTIL 9 PM PDT THIS EVENING FOR PIGEON PT
TO PT PINOS 0-10 NM.
SMALL CRAFT ADVISORY FROM 9 AM THURSDAY TO 3 AM PDT FRIDAY FOR
PIGEON PT TO PT PINOS 0-10 NM.
SMALL CRAFT ADVISORY UNTIL 3 PM PDT THURSDAY FOR PT PINOS TO PT
PIEDRAS BLANCAS 0-10 NM.
GALE WARNING FROM 3 PM THURSDAY TO 3 AM PDT FRIDAY FOR PT PINOS
TO PT PIEDRAS BLANCAS 0-10 NM.
SHORT TERM...RW
LONG TERM....RW
AVIATION...CANEPA
MARINE...RGASS
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