Sunday, January26, 2020
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Marine Weather and Tides
Foster City, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:15AMSunset 5:27PM Sunday January 26, 2020 10:51 AM PST (18:51 UTC) Moonrise 8:40AMMoonset 7:19PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 836 Am Pst Sun Jan 26 2020
Today..W winds 5 to 15 kt. A chance of rain this morning.
Tonight..W winds 5 to 15 kt.
Mon..W winds up to 10 kt.
Mon night..W winds 5 to 10 kt.
Tue..SW winds 5 to 10 kt. A slight chance of rain.
Tue night..NW winds 5 to 10 kt.
Wed..NW winds up to 10 kt.
Thu..NW winds around 5 kt.
PZZ500 836 Am Pst Sun Jan 26 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Locally breezy northwest winds expected today behind the weak frontal boundary that moved through this morning. The strongest winds will be along the big sur coast tonight into Monday. A long period west to northwest swell is arriving today as well. An additional long period northwest swell will arrive by early next week.


7 Day Forecast for Marine Location Near Foster City city, CA
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location: 37.55, -122.24     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 261746 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 946 AM PST Sun Jan 26 2020

SYNOPSIS. Light rain lingers behind a cold front moving east after bringing rain to the region. Dry conditions are forecast to develop this afternoon and will persist through Monday. Another weak system is forecast to bring rain to the North Bay by Tuesday. Dry weather conditions and a warming trend are then likely from Wednesday through next Saturday.

DISCUSSION. as of 08:39 AM PST Sunday . The cold front has pushed through the Bay Area and is now moving over the Sierra and onward toward Nevada. Highest total rainfall were in the coastal North Bay ranges receiving three-quarters of an inch to an inch. Lower elevations of Marin and Sonoma county received a quarter of an inch to a half an inch. Most urban locations around the Bay Area saw a tenth of an inch to a quarter of an inch. The Central Coast saw a few hundredths of an inch to just over a tenth of an inch.

Behind the front, lingering light rain persists in its wake. However, accumulations are minimal. Precipitation should continue to taper off through the morning. High pressure will build and drier conditions are expected later today lasting through Monday. Patchy fog is possible Monday morning in traditional valley locations.

The forecast remains on track that the next chance of rain looks to be from Monday evening and into Tuesday morning. Models have been consistently keeping most of the precipitation north of the Golden Gate. It is a weak system moving in; therefore accumulations are expected to be be less than this weekend's rain. Wednesday sees high pressure and dry conditions build once again, and should remain in place through Saturday.

PREV DISCUSSION. as of 02:43 AM PST Sunday . Light to moderate rain associated with a cold front continues to spread inland over the North Bay and is approaching the San Francisco Peninsula. Ahead of the front, light warm advection rain has been reported at many sites across the region. Rainfall ahead of the boundary has generally be light with only a few hundredths of an inch or so (enough to wet roadways). Meanwhile, rainfall amounts of up to around one-tenth of an inch per hour has been reported within the main rainband which will continue to shift inland and to the south through the morning. Short-range forecast guidance indicates precipitation will diminish in coverage as it approaches the Central Coast later this morning in response to the dissipating frontal boundary. Regardless, much of the region will see some light precipitation through the morning as the front advances inland.

While a few showers may linger in wake of the frontal passage late this morning into the early afternoon, dry weather conditions are likely to develop region-wide late in the afternoon and by the evening. Widespread cloud cover will also give way to partly cloudy sky conditions this afternoon with temperatures warming into the lower/middle 60s. Overnight temperatures will also turn slightly cooler and drop back into the 40s by Monday morning given the clearing sky conditions and light winds.

Another weak system will push inland across the Pacific Northwest and northern California Monday night into Tuesday morning. This system will be weaker than that one currently impacting the region with the best chance of any precipitation mainly staying north of the Golden Gate. A gradual warming trend is then forecast for the latter half of the upcoming work week as high pressure builds over the eastern Pacific. By the upcoming Friday or Saturday, daytime temperatures may reach into the lower 70s as the ridge of high pressure shifts inland over the state.

General thinking in the extended is that temperatures will cool slightly the first week in February with an active storm track to our north. However, widespread rainfall does not appear likely over the Bay Area or Central Coast. The ensembles also indicate a mainly dry pattern persisting into the first week of February.

AVIATION. as of 9:47 AM PST Sunday . For 18Z TAFs. A weak cool front moved across the Bay Area this morning. Behind this front, winds will shift westerly and clouds will gradually decrease. Mostly clear skies expected by Monday morning.

Vicinity of KSFO . MVFR cigs becoming VFR by 21Z. Winds will be westerly 12 knots or less. VFR overnight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . IFR cigs until 20Z or so. Light west winds. MVFR overnight with cigs and patchy fog.

MARINE. as of 08:39 AM PST Sunday . Locally breezy northwest winds expected today behind the weak frontal boundary that moved through this morning. The strongest winds will be along the Big Sur coast tonight into Monday. A long period west to northwest swell is arriving today as well. An additional long period northwest swell will arrive by early next week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: RGass/DK AVIATION: Sims MARINE: Sims

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi51 min 57°F 55°F1024.3 hPa (+2.3)
AAMC1 - 9414750 - Alameda, CA 16 mi51 min 53°F
LNDC1 17 mi51 min 57°F 1023.7 hPa (+2.3)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi69 min W 7 G 8.9
OBXC1 18 mi51 min 56°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi51 min 57°F 1022.8 hPa (+2.3)
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi51 min 56°F 1023.7 hPa (+2.2)
PXSC1 19 mi51 min 58°F 55°F
FTPC1 - 9414290 - San Francisco, CA 21 mi57 min 57°F 54°F1023.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi51 min 58°F 1024 hPa (+2.3)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 26 mi40 min NNW 4.1 58°F 1024 hPa
46237 - San Francisco Bar, CA (142) 27 mi51 min 54°F6 ft
RCMC1 - 9414863 - Richmond, CA 27 mi51 min 53°F
UPBC1 34 mi63 min W 8.9 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi51 min 57°F 51°F1023.2 hPa (+2.2)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi21 min WNW 9.7 G 12 55°F 54°F1025.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi51 min 56°F 1023.1 hPa (+2.5)
PCOC1 - 9415144 - Port Chicago, CA 37 mi51 min 56°F 51°F1022.8 hPa (+2.2)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 37 mi21 min NW 9.7 G 12 55°F 55°F1025.6 hPa52°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi51 min 58°F 1022.8 hPa (+2.1)
SFXC1 - San Francisco Bay Reserve, CA 46 mi66 min W 9.9

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi63 minW 610.00 miMostly Cloudy57°F53°F88%1024 hPa
Palo Alto Airport, CA8 mi64 minNNW 310.00 miMostly Cloudy57°F55°F94%1024 hPa
San Francisco, San Francisco International Airport, CA8 mi1.9 hrsW 108.00 miMostly Cloudy59°F53°F81%1022.9 hPa
Hayward, Hayward Air Terminal, CA10 mi57 minW 6 miMostly Cloudy58°F53°F84%1024.4 hPa
Oakland, Metro Oakland International Airport, CA10 mi58 minWSW 510.00 miMostly Cloudy60°F54°F80%1023.6 hPa
Half Moon Bay Airport, CA14 mi56 minNW 69.00 miMostly Cloudy55°F53°F94%1024 hPa
San Jose, San Jose International Airport, CA21 mi58 minN 410.00 miMostly Cloudy58°F55°F90%1023.8 hPa

Link to 5 minute data for KSQL

Wind History from SQL (wind in knots)
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Last 24hrNE5NE5333SW6W8NW6Calm--CalmW3E4SE3CalmCalmW8SW3NW4CalmCalmCalmW6W9
1 day ago4NE7NE7N6--3NW5--NW5CalmCalmCalmCalmCalmCalmCalmCalmS3CalmCalmCalmCalm33
2 days ago3--CalmCalm33CalmCalmCalmCalmNW4CalmCalmCalmNW4CalmS3CalmS3CalmCalm4CalmCalm

Tide / Current Tables for Bay Slough, west end, San Francisco Bay, California
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Bay Slough
Click for Map
Sun -- 02:06 AM PST     6.83 feet High Tide
Sun -- 07:17 AM PST     Sunrise
Sun -- 07:30 AM PST     2.79 feet Low Tide
Sun -- 08:39 AM PST     Moonrise
Sun -- 12:44 PM PST     8.11 feet High Tide
Sun -- 05:25 PM PST     Sunset
Sun -- 07:19 PM PST     Moonset
Sun -- 08:04 PM PST     -0.35 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.16.36.86.55.74.53.52.92.93.85.26.77.88.17.66.44.72.81.20.1-0.301.22.7

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Sun -- 02:47 AM PST     -0.00 knots Slack
Sun -- 05:22 AM PST     -0.89 knots Max Ebb
Sun -- 07:17 AM PST     Sunrise
Sun -- 08:09 AM PST     0.01 knots Slack
Sun -- 08:40 AM PST     Moonrise
Sun -- 10:45 AM PST     1.26 knots Max Flood
Sun -- 01:51 PM PST     -0.00 knots Slack
Sun -- 05:25 PM PST     Sunset
Sun -- 05:27 PM PST     -1.80 knots Max Ebb
Sun -- 07:19 PM PST     Moonset
Sun -- 08:58 PM PST     0.01 knots Slack
Sun -- 11:48 PM PST     1.71 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.30.7-0.1-0.6-0.9-0.8-0.5-0.10.61.11.310.6-0.1-0.8-1.4-1.8-1.7-1.3-0.7011.6

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.