688
FXUS66 KMTR 081236
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
536 AM PDT WED OCT 8 2025
..NEW AVIATION, MARINE
KEY MESSAGES
UPDATED AT 152 AM PDT WED OCT 8 2025
- COOLER AND CLOUDIER WEATHER TODAY
- DRIZZLE TONIGHT THROUGH THURSDAY MORNING
- LIGHT RAIN CHANCES INCREASE FRIDAY THROUGH SATURDAY MORNING FOR
THE NORTH BAY, BAY AREA AND EAST BAY
SHORT TERM
ISSUED AT 152 AM PDT WED OCT 8 2025
(TODAY AND TONIGHT)
A WEAK UPPER LEVEL LOW THAT HAS LINGERED OFF THE CENTRAL COAST THE
PREVIOUS FEW DAYS HAS BEGUN EVOLVING INTO AN OPEN WAVE OVERNIGHT AND
WILL EVENTUALLY BE ABSORBED BY A DEEPENING TROUGH TO OUR NORTH LATER
THIS AFTERNOON. THE PATTERN CHANGE IN MOTION THIS MORNING WILL
RESULT IN INLAND TEMPERATURES TODAY THAT WILL BE 5-15 DEGREES COOLER
THAN YESTERDAY AND UP TO 5 DEGREES COOLER ALONG THE COAST. A WEAK
SURFACE TROUGH OUT AHEAD OF THE FIRST OF NUMEROUS UPPER LEVEL TROUGH
AXIS' PASSING THROUGH OUR AREA THE REST OF THE WEEK, WILL BRING
AREAS OF DRIZZLE TONIGHT THROUGH THURSDAY MORNING.
LONG TERM
ISSUED AT 152 AM PDT WED OCT 8 2025
(THURSDAY THROUGH TUESDAY)
THE PERSISTENT TROUGHING PATTERN THROUGH THE EXTENDED FORECAST
PERIOD WILL KEEP TEMPERATURES AROUND OR BELOW NORMAL WELL INTO NEXT
WEEK. RAIN CHANCES CONTINUE PRIMARILY FOR THE NORTH BAY FRIDAY INTO
EARLY SATURDAY, WITH THUNDERSTORM CHANCES AROUND 5% OR LESS FRIDAY
AFTERNOON. CONSENSUS IS GOOD WRT THE OVERALL PATTERN THROUGH THE
WEEKEND. EXTENDED DETERMINISTIC GUIDANCE HAS POOR CONSENSUS ON
THE POTENTIAL FOR WIDESPREAD WETTING RAINFALL FOR THE BEGINNING OF
NEXT WEEK. ECMWF/CANADIAN MODELS HAVE STRONG SIGNAL FOR RAIN,
WHILE THE GFS HAS LITTLE TO NO RAIN IN OUR AREA FOR THAT SAME TIME
FRAME. THE NBM IS CLEARLY LEANING ON THE ECMWF/CANADIAN
SOLUTIONS, WHICH SEEMS REASONABLE ATTM. THE DIFFERENCE BEING THE
GFS DEEPENS AN UPPER LEVEL DISTURBANCE FARTHER INLAND, WHILE THE
ECMWF/CANADIAN INDICATE A MORE PLAUSIBLE DEEPENING OF THE SYSTEM
JUST OFFSHORE AND PUSH IT SOUTH ALONG THE COAST, GIVING IT MORE
TIME TO PICK UP MOISTURE ALONG THE WAY.
AVIATION
(12Z TAFS)
ISSUED AT 536 AM PDT WED OCT 8 2025
NEARLY WIDESPREAD MVFR AND IFR CIGS ARE EXPECTED THROUGH MUCH OF THE
MORNING. CLOUD COVER LIFTS AND SCATTERS INTO THE LATE MORNING AND
EARLY AFTERNOON. LEADING TO MOSTLY VFR CONDITIONS ACROSS THE REGION,
WITH THE EXCEPTION OF STS, WHICH WILL FAIL TO CLEAR. EXPECT MODERATE
TO BREEZY WINDS THROUGH THE AFTERNOON AND INTO THE EVENING BEFORE
WINDS WEAKEN AND CLOUD COVER BUILDS IN THE NORTH BAY AND ALONG THE
IMMEDIATE COAST WITH CHANCES FOR DRIZZLE.
VICINITY OF SFO...VFR THROUGH THE TAF PERIOD. EXPECT PASSING LOW
CLOUDS AROUND THE SF BAY THROUGH THE MORNING THAT WILL THIN OUT INTO
THE AFTERNOON AS MODERATE SOUTHWEST WINDS BUILD. THESE WINDS LOOK TO
WEAKEN AND TURN MORE SOUTHERLY INTO THE NIGHT AS SCATTERED MID-LEVEL
CLOUDS BUILD.
SFO BRIDGE APPROACH...SIMILAR TO SFO.
MONTEREY BAY TERMINALS...MVFR CIGS LINGER INTO THE AFTERNOON BEFORE
ERODING AS WINDS INCREASE. CLOUD COVER STRUGGLES TO RETURN INTO THE
EVENING WHILE WINDS REDUCE INTO THE NIGHT.
MARINE
(TODAY THROUGH MONDAY)
ISSUED AT 536 AM PDT WED OCT 8 2025
EXPECT MOSTLY LIGHT TO MODERATE WINDS INTO THE LATE WEEK. DRIZZLE
AND POCKETS OF FOG AFFECT THE WATERS LATE WEDNESDAY THROUGH MUCH
OF THURSDAY. LIGHT SHOWERS ARRIVE TO THE NORTHERN WATERS THURSDAY
NIGHT AND LAST INTO LATE FRIDAY. WINDS ACROSS THE WATERS BUILD
OVER THE WEEKEND WITH ADDITIONAL AND PROLONGED RAIN CHANCES
ARRIVING INTO THE NEXT WORK WEEK.
MTR WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
SHORT TERM...JM
LONG TERM....JM
AVIATION...MURDOCK
MARINE...MURDOCK
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