770
FXUS66 KMTR 011747
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1047 AM PDT WED APR 1 2026
..NEW AVIATION, MARINE
KEY MESSAGES
UPDATED AT 102 AM PDT WED APR 1 2026
- COOLER CONDITIONS CONTINUE THROUGH THURSDAY.
- LIGHT RAIN TODAY THROUGH EARLY THURSDAY MORNING.
- A WARMING TREND BEGINS ON FRIDAY AND CONTINUES INTO THE
WEEKEND.
- OFFSHORE FLOW RETURNS FRIDAY, WITH 40-50MPH WIND GUSTS EXPECTED
FOR INTERIOR NORTH BAY MOUNTAINS.
SHORT TERM
ISSUED AT 102 AM PDT WED APR 1 2026
(TODAY AND TONIGHT)
THE NEXT ROUND OF BENEFICIAL RAIN WILL MOVE INTO THE NORTH BAY
DURING THE MORNING HOURS AND WILL GRADUALLY SPREAD SOUTH THE CENTRAL
COAST BY THE LATE AFTERNOON AND EVENING HOURS. AMOUNTS HAVE COME UP
SINCE THE LAST FORECAST, WITH THE NORTH BAY MOUNTAINS HAVING THE
POTENTIAL TO SEE UP TO 0.25-0.75", UP TO 1.0" FOR THE INTERIOR
RANGES, AND AROUND 0.10-.25" OF RAIN FOR THE VALLEYS. THE SAN
FRANCISCO PENINSULA TO SANTA CRUZ COUNTY IS FORECAST TO SEE AROUND
0.1-.30" WITH UP TO 0.5" FOR THE SANTA CRUZ MOUNTAINS. INTERIOR EAST
AND SOUTH BAY VALLEYS WILL BE CLOSE TO 0.05-0.15" OF RAIN, WHILE THE
DIABLO RANGE AND THE BERKELEY AND SAN LEANDRO HILLS MAY SEE UP TO
0.5". FOR INTERIOR MONTEREY AND SAN BENITO COUNTIES, AMOUNTS WILL BE
LOWER AND IN THE 0.0-0.15" RANGE WHILE ALONG THE COAST AND INTO THE
SANTA LUCIAS AMOUNTS FROM 0.10-0.30". IF TRAVELING TODAY, BE MINDFUL
THAT THE ROADWAYS MAY BE SLICK.
IN ADDITION TO THE RAIN, SOUTHWESTERLY WINDS WILL GRADUALLY PICK UP
AND BECOME BREEZY WITH GUSTS UP TO 20-30 MPH, UP TO 40 MPH IN AREAS
OF HIGHER TERRAIN. WINDS ARE EXPECTED TO BECOME WEST-NORTHWEST
WINDS EXPECTED BY LATE WEDNESDAY INTO EARLY THURSDAY MORNING.
LONG TERM
ISSUED AT 102 AM PDT WED APR 1 2026
(THURSDAY THROUGH TUESDAY)
CONDITIONS BEGIN TO DRY UP ON THURSDAY, AS COLD FRONT EXITS THE
REGION AND THE PARENT UPPER LOW MOVES INTO THE INTERMOUNTAIN WEST.
HIGH PRESSURE BUILDS INTO THE EASTERN PACIFIC WHICH WILL BING DRIER
INTO THE REGION. THE PRESSURE GRADIENT BETWEEN THESE TWO SYSTEM WILL
TIGHTEN ON FRIDAY, BRINGING WARMING TEMPERATURES AND GUSTY OFFSHORE
WINDS. THE STRONGEST WINDS WILL BE ACROSS THE NORTH BAY INTERIOR
MOUNTAINS AND EAST AND SOUTH BAY MOUNTAINS WITH 40-50MPH WIND GUSTS
EXPECTED FOR INTERIOR NORTH BAY MOUNTAINS. WARMER WEATHER CONTINUES
AVIATION
(18Z TAFS)
ISSUED AT 1046 AM PDT WED APR 1 2026
A MIX BAG OF IFR TO VFR CONDITIONS THIS MORNING! FAIRLY HIGH
CONFIDENCE FOR THESE CONDITIONS TO PERSIST THROUGH MUCH OF THE TAF
PERIOD. PRE-FRONTAL RAIN SHOWERS WILL PERSIST AT TIMES THROUGHOUT
THE AFTERNOON AND THEN CLEAR OUT IN WAKE OF THE OVERNIGHT/EARLY
MORNING (THURSDAY) FRONTAL PASSAGE. WEST-SOUTHWEST WINDS WILL
INCREASE THROUGHOUT THE AFTERNOON BEFORE BECOMING NORTHWESTERLY IN
WAKE OF THE FRONTAL PASSAGE AS CEILINGS BEGIN TO LIFT AND CLEAR
OUT EARLY THURSDAY MORNING.
VICINITY OF SFO...MVFR TO VFR CONDITIONS THROUGH EARLY THURSDAY
MORNING WITH AN INCREASE IN WEST-SOUTHWEST WINDS HEAD OF AN
APPROACHING FRONTAL BOUNDARY. ALSO, VCSH THROUGH 21Z TODAY AND
-SHRA AFTERWARDS TO ACCOUNT FOR A GREATER PROBABILITY OF SEEING
RAIN SHOWERS. GREATER PROBABILITY OF VFR CONDITIONS TO RETURN
AROUND OR AFTER 08Z THURSDAY IN WAKE OF THE FRONTAL PASSAGE.
SFO BRIDGE APPROACH...SIMILAR TO SFO.
MONTEREY BAY TERMINALS...VFR. GENERALLY EXPECTING VFR CONDITIONS
THROUGH THE DAY WITH AN INCREASE IN WEST-SOUTHWEST WINDS THIS
AFTERNOON. MVFR CONDITIONS ARE FORECAST TO RETURN EARLY THURSDAY
MORNING AROUND 07Z-09Z AND THEN CLEARING IN WAKE OF THE FRONTAL
PASSAGE.
MARINE
(TODAY THROUGH MONDAY)
ISSUED AT 1046 AM PDT WED APR 1 2026
MODERATE SOUTHWESTERLY BREEZES AHEAD OF THE COLD FRONT THIS
MORNING WILL INCREASE AND VEER TO BECOME FRESH AND NORTHWESTERLY
TONIGHT. THE COLD FRONT WILL BRING LIGHT RAIN THIS AFTERNOON INTO
TONIGHT. WIDESPREAD HAZARDOUS CONDITIONS ARRIVE THURSDAY AND
CONTINUE INTO FRIDAY WITH STRONG NORTHERLY BREEZES AND ROUGH SEAS.
NORTHERLY BREEZES DIMINISH AND SEAS ABATE BY THIS WEEKEND.
MTR WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 3 PM THIS AFTERNOON TO 3 AM PDT FRIDAY
FOR PT ARENA TO PT REYES 0-10 NM-PT ARENA TO PT REYES 10-60
NM-PT REYES TO PIGEON PT 0-10 NM-SF BAY N OF BAY BRIDGE.
SMALL CRAFT ADVISORY FROM 3 AM THURSDAY TO 3 AM PDT FRIDAY FOR
MRY BAY-PIGEON PT TO PT PINOS 0-10 NM-PIGEON PT TO PT PINOS
10-60 NM-PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM.
SHORT TERM...KR
LONG TERM....KR
AVIATION...RGASS
MARINE...SARMENT
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