Wednesday, April21, 2021
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Marine Weather and Tides
Sunnyvale, CA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:22AMSunset 7:49PM Wednesday April 21, 2021 4:01 AM PDT (11:01 UTC) Moonrise 12:46PMMoonset 2:32AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ531 San Francisco Bay South Of The Bay Bridge- 237 Am Pdt Wed Apr 21 2021
Today..W winds 5 to 15 kt with gusts up to 25 kt this afternoon.
Tonight..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
Thu night..SW winds 5 to 15 kt.
Fri..W winds 5 to 15 kt.
Fri night..W winds 5 to 10 kt.
Sat..SW winds 5 to 15 kt. Rain likely.
Sun..SW winds 5 to 15 kt. Rain.
PZZ500 237 Am Pdt Wed Apr 21 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong winds with gale force gusts continue over the northern outer waters creating fresh steep wind waves resulting in hazardous seas particularly for smaller vessels. Winds remain moderately strong elsewhere and gradually diminish with seas remaining hazardous for smaller vessels on Wednesday. A moderate northwest swell continues through the week. Chance for rain this coming weekend.


7 Day Forecast for Marine Location Near Sunnyvale, CA
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location: 37.42, -121.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 210956 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 256 AM PDT Wed Apr 21 2021

SYNOPSIS. Dry and seasonal weather returns Wednesday through Friday. Increasing clouds Saturday leading to a chance of rain Sunday. Lingering showers early Monday otherwise dry with a warming trend into the middle of next week.

DISCUSSION. as of 2:56 AM PDT Wednesday . Well defined upper low is now centered near Yosemite with any associated showers staying over the Sierra today. For the Bay Area the upper low has deepened the marine stratus with low clouds covering much of San Mateo and Santa Cruz county as well as the Central Coast. Drier northerly winds around the upper low has brought much drier air into the North Bay with mostly clear skies. The drier northerly winds will bring the most noted warming to the North Bay where 70s and lower 80s will be most likely to occur. Onshore winds for SF and the Central Coast will keep coastal areas mostly cloudy and cooler while 70s will return for the interior valleys of the East and South Bay after some cool temps on Tuesday.

For Thursday and Friday high pressure aloft will build bringing a dry and seasonal weather pattern. Onshore winds will keep a well defined marine layer in place along the coast with night and morning intrusions of low clouds and fog. Afternoon highs 60s coast with mainly 70s inland for the end of the work week.

Saturday will be a transition day as stronger onshore winds will ramp up ahead of incoming cold front. Look for increasing clouds and a cooling trend for Saturday afternoon.

Cold front and associated rainfall is still on track for Sunday. Still far enough out that timing could change but current model solutions suggest we'll see some rain for the North Bay as early as Sunday morning. Rain to spread north to south on Sunday, at a fairly good clip with steady rains associated with the surface cold front. Enough instability for plenty of post-frontal showers in northwest wind flow. Will have to assess t-storm potential in the coming days but for now those have been left out of the forecast. Latest qpf forecasts have trended down slightly but still above average confidence for a soaking rain. Bay Area rainfall estimates still on the order of 0.25-0.50 for most locations with higher potential coastal hills and lower amounts interior valleys. This is supported by model ensembles with deterministic and 50 member averages showing similar rainfall numbers.

A new drought monitor will be released later this week and the trends will be for more adverse drought impacts across the region and state. This storm will have little overall impact on the long term drought. However, confidence is increasing that most of the Bay Area will see soaking rains Sunday into early Monday. At the very least this will put a pause into the onset of fire season as fuel moisture readings are trending towards historically dry values. So from an impacts stand point this will bring beneficial rains and if the current timing holds up the roadway impacts would be mostly confined to Sunday traffic. For weekend planning, Saturday will be the better day for outdoor plans. Snow levels will be dropping in the Sierra so trans-Sierra passes will be impacted by snow for return travel later Sunday into Monday. All locations will notice cooler daytime highs Sunday into Monday.

Any lingering showers Monday should end early though official forecast will hold onto some low precip chances into Monday evening. Drying and modest warming trend Tuesday into Weds of next week as high pressure builds and the main storm track shifts north of the Bay Area.

AVIATION. As of 10:42 PM PDT Tuesday . For the 06Z TAFs. The scattered showers over the East Bay are slowly dissipating. Scattered drizzle is still being observed down the San Mateo coastline and around the Monterey Peninsula. Winds have finally reduced compared to this afternoon, but remain breezy. Cigs are mostly between 1000 and 1500 feet, with a few terminals varying just above or below that. However clouds remain patchy so terminals in the North Bay are VFR with MVFR over the SF Bay and south of that. Isolated IFR is possible over night, but more widespread MVFR is expected as winds continue to subside. Models are trending for a later clearing of clouds for a brief window of VFR conditions Wednesday afternoon with a much more traditional seabreeze expected. Clouds return Wednesday evening with models hinting at MVFR levels.

Vicinity of KSFO . Winds continue to move in onshore spilling stratus over the southern SF Bay. Cigs currently bouncing around between 1100 and 1400 feet for MVFR conditions. Possible periods of SCT clouds, but widespread OVC MVFR conditions expected overnight with breezy winds. Much for traditional seabreeze expected Wednesday afternoon around 15 kts. Cigs are expected to break up after 18Z, a little later, but VFR expected Wednesday afternoon. Winds subside Wednesday night with a return to MVFR conditions.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Cloud cover sitting over the terminals for IFR/MVFR conditions through the evening. Drizzle can still be expected closer to the coast into early Wednesday morning. Some clearing expected inland after 20Z, but coastal terminals will likely be socked in with MVFR cloud cover through the day. Widespread MVFR conditions return Wednesday night with a chance for IFR possible.

MARINE. as of 2:37 AM PDT Wednesday . Strong winds with gale force gusts continue over the northern outer waters creating fresh steep wind waves resulting in hazardous seas particularly for smaller vessels. Winds remain moderately strong elsewhere and gradually diminish with seas remaining hazardous for smaller vessels on Wednesday. A moderate northwest swell continues through the week. Chance for rain this coming weekend.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm until 9 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 9 AM GLW . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 PM SCA . SF Bay from 3 PM



PUBLIC FORECAST: RWW AVIATION: DK MARINE: DK

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi44 min Calm G 2.9 50°F 1011.8 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi44 min S 5.1 G 8.9 51°F 62°F1010.8 hPa
LNDC1 30 mi44 min S 7 G 11 51°F 1010.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi44 min SW 11 G 15
OBXC1 33 mi44 min 51°F 50°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi44 min SSW 7 G 9.9 50°F 1010.5 hPa
46269 34 mi62 min 50°F 53°F6 ft
PXSC1 34 mi44 min 51°F 51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 34 mi44 min SE 8.9 G 12 50°F 1009.3 hPa
FTPC1 - 9414290 - San Francisco, CA 37 mi50 min SSE 1.9 G 6 49°F 55°F1010.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi44 min S 15 G 18 51°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 41 mi51 min S 6 49°F 1010 hPa
RCMC1 - 9414863 - Richmond, CA 42 mi50 min SSE 8 G 13 51°F 57°F1010.2 hPa
UPBC1 43 mi44 min WNW 5.1 G 7
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi44 min WNW 8 G 11 56°F 1008.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi44 min WNW 5.1 G 6 55°F 61°F1009.4 hPa
46237 - San Francisco Bar, CA (142) 43 mi62 min 49°F8 ft
PCOC1 - 9415144 - Port Chicago, CA 44 mi44 min SSW 7 G 9.9 51°F 62°F1009 hPa
MLSC1 - Moss Landing, South Harbor, CA 44 mi36 min 55°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi77 min SW 5.1 50°F 1015 hPa48°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 46 mi44 min SW 8 G 9.9 53°F 1009.2 hPa
46092 - MBM1 46 mi56 min W 7.8 50°F 51°F1011.4 hPa (-0.6)
CQUC1 47 mi43 min 60°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi32 min NW 18 G 21 49°F 1011.9 hPa47°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi32 min NW 18 G 23 51°F 52°F1012.2 hPa48°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA4 mi69 minS 910.00 miFair51°F43°F74%1010.6 hPa
San Carlos Airport, CA16 mi67 minN 010.00 miFair48°F45°F87%1011.2 hPa
Hayward, Hayward Air Terminal, CA18 mi68 minN 08.00 miMostly Cloudy51°F45°F80%1011.7 hPa
Livermore, Livermore Municipal Airport, CA21 mi69 minW 610.00 miFair48°F43°F83%1010 hPa
Oakland, Metro Oakland International Airport, CA23 mi69 minSSW 88.00 miMostly Cloudy52°F47°F83%1011.1 hPa
San Francisco, San Francisco International Airport, CA24 mi66 minW 99.00 miOvercast53°F46°F77%1010.6 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrSE7S6S5S5S8S54CalmNW7NW10W15W14
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1 day agoN3N4N5N5CalmCalmNW66NW7N9NW10NW9NW11N14N9N7N9CalmNW5N4CalmCalmS4S4
2 days agoCalmCalmCalmSE3CalmCalmCalmN5NW4NW7NW10NW13NW16N17N14NW7NW5N3NW5NW6W3CalmSW3N6

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Wed -- 03:32 AM PDT     Moonset
Wed -- 04:00 AM PDT     3.21 feet Low Tide
Wed -- 06:24 AM PDT     Sunrise
Wed -- 07:58 AM PDT     7.78 feet High Tide
Wed -- 01:45 PM PDT     Moonrise
Wed -- 04:16 PM PDT     0.09 feet Low Tide
Wed -- 07:49 PM PDT     Sunset
Wed -- 10:28 PM PDT     7.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.15.14.13.53.23.85.477.87.56.85.74.22.71.40.50.10.41.53.156.67.67.6

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Wed -- 01:18 AM PDT     -0.47 knots Max Ebb
Wed -- 03:32 AM PDT     Moonset
Wed -- 03:48 AM PDT     0.00 knots Slack
Wed -- 05:59 AM PDT     0.59 knots Max Flood
Wed -- 06:24 AM PDT     Sunrise
Wed -- 08:37 AM PDT     -0.00 knots Slack
Wed -- 01:23 PM PDT     -1.04 knots Max Ebb
Wed -- 01:46 PM PDT     Moonrise
Wed -- 04:13 PM PDT     0.01 knots Slack
Wed -- 07:07 PM PDT     1.21 knots Max Flood
Wed -- 07:49 PM PDT     Sunset
Wed -- 10:25 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.5-0.4-0.20.10.40.60.50.2-0.1-0.4-0.7-0.9-1-1-0.6-0.10.511.21.10.80.3-0.2

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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