Tuesday, January28, 2020
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Marine Weather and Tides
Belvedere, 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 5:29PM Tuesday January 28, 2020 6:48 PM PST (02:48 UTC) Moonrise 9:41AMMoonset 9:15PM Illumination 17% Phase: Waxing Crescent; Moon at 4 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- 223 Pm Pst Tue Jan 28 2020
Tonight..NW winds 5 to 15 kt.
Wed..NW winds 5 to 10 kt.
Wed night..W winds 5 to 15 kt.
Thu..W winds up to 10 kt.
Thu night..W winds up to 10 kt.
Fri..S winds up to 10 kt.
Fri night..N winds around 5 kt.
Sat..N winds up to 10 kt.
Sun..NW winds 10 to 20 kt with gusts up to 25 kt.
PZZ500 223 Pm Pst Tue Jan 28 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak cold front continues to move through the coastal waters late this afternoon. Northerly winds will increase behind the front this evening and overnight. Increasing winds will result in steeper wind waves. Conditions will remain elevated through the work week. A long period northwest swell will arrive later this week.


7 Day Forecast for Marine Location Near Belvedere, CA
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location: 37.83, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 290050 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 450 PM PST Tue Jan 28 2020

SYNOPSIS. Conditions will continue to dry out the rest of the afternoon. Dry conditions will then persist region-wide through the remainder of the week along with a gradual warming trend. Cooling is then forecast by Sunday and into early next week.

DISCUSSION. as of 01:55 PM PST Tuesday . Satellite and radar imagery shows patchy clouds around the Bay Area along with some lingering showers associated with a weak frontal system. Overall, the North Bay received between a few hundredths to around two tenths of an inch while the Bay Area received a few hundredths to a tenth of an inch around Half Moon Bay. A few showers may linger around the Bay Area this afternoon before conditions dry out. Temperatures this afternoon are in the upper 50s and low 60s. Expect maybe a few degrees of additional warming this afternoon before temperatures begin to cool down for the evening.

As the mid/upper level system exits the region tonight, an upper ridge will build over the eastern Pacific and inland tomorrow through the rest of the week. This will allow for continued dry conditions as well as a gradual warming trend. Many locations will reach the mid to upper 60s on Thursday with portions of the interior in the low 70s on Friday. More widespread low to mid 70s are possible on Saturday as warming peaks. This will bring many areas around 5 to 10 degrees above seasonal normals. Models still show 850 mb temperatures reaching about 13 to 16 deg C Friday and Saturday. To put this in perspective, SPC sounding climatology shows the maximum 850 mb temperatures for KOAK in early February at around 17 deg C.

Temperatures will quickly cool on Sunday and into early next week as a broad upper trough sets up over the Western U.S. Both the GFS and ECMWF show a steep 24 hour drop in 850 mb temperatures with between 12 to 15 deg C forecast for Saturday afternoon and -1 to -2 deg C by Sunday afternoon. This will bring afternoon high temperatures down by about 5 to 7 or so deg F on Sunday with further cooling anticipated on Monday. Though models do show some precipitation with this system, it is likely to remain to our north and east. Longer range outlooks continue to look dry for much of the region into at least early February.

AVIATION. as of 4:50 PM PST Tuesday . For 00Z TAFs. A weak surface to lower level cool front from the San Mateo Coast to southern Napa county is moving southeastward late this afternoon generating mainly MVFR ceilings, though at times there have been very local IFR conditions on the coastline. The coastal terrain is also causing sluggishness in the forward motion of the front. Cooler air advection is primarily focusing at 925 mb which turns neutral tonight then warm air advection Wednesday; high res model output leans toward sufficiently drier air Wednesday supporting VFR, though will soon see if the 00z WRF shows the same. A marginal tightening of the 925 mb thermal gradient leading to later week warmer air as advertised could help cause patchy low clouds /MVFR ceilings/ Wednesday.

Jet stream cirrus and cirrostratus will continue to move in from the north tonight and early Wednesday morning as the north-south aligned jet advances slowly eastward from CA to NV. Areal coverage as well as thickness of higher clouds may offset the rate of boundary layer cooling, however will have to watch for possible low clouds and/or fog tonight into Wednesday morning.

Vicinity of KSFO . Regrowth of low clouds has occurred, 5 min obs show MVFR continuing with west wind at 10 knots. Cool front is weak though aloft at 925 mb it is remarkably aligned well with present location of low clouds seen on satellite. Model forecasts indicate a slow progression of the surface and lower level front to the southeast through this evening. Best can tell from recent high resolution model output some drying should arrive by mid evening helping to lift ceilings or even mix it out to scattered clouds. Low confidence if and how long low clouds return tonight, will monitor satellite and obs.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Still ahead of the cool front here, weak cool air advection then commences tonight thus for now VFR continues. Cloud ceilings forecast to lower tonight to MVFR though in spots IFR is possible due to combination convergence along the frontal boundary and night-time cooling of the boundary layer. High clouds with jet stream winds should mainly stay to our north for the most part tonight.

MARINE. as of 3:42 PM PST Tuesday . A weak cold front continues to move through the coastal waters late this afternoon. Northerly winds will increase behind the front this evening and overnight. Increasing winds will result in steeper wind waves. Conditions will remain elevated through the work week. A Long period northwest swell will arrive later this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 9 PM SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm from 9 PM



PUBLIC FORECAST: AS AVIATION: Canepa MARINE: MM

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi48 min W 2.9 G 6 1025.7 hPa (+0.0)
PXSC1 3 mi48 min 56°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi48 min W 6 G 8.9 54°F 1024.7 hPa (+0.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi49 min NW 1 52°F 1026 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi48 min W 8 G 9.9 54°F 1025.7 hPa (+0.0)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi48 min W 8.9 G 11
OBXC1 6 mi48 min 55°F 55°F
RCMC1 - 9414863 - Richmond, CA 7 mi48 min W 2.9 G 5.1 54°F1025.2 hPa (+0.4)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi48 min NW 8 G 11 57°F 1025.9 hPa (+0.5)
AAMC1 - 9414750 - Alameda, CA 8 mi48 min W 5.1 G 8 54°F1025.7 hPa (+0.0)
LNDC1 9 mi48 min W 6 G 8 55°F 1025.6 hPa (+0.0)
46237 - San Francisco Bar, CA (142) 11 mi48 min 54°F8 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi48 min W 7 G 8.9 55°F 1025.1 hPa (+0.3)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi48 min W 9.9 G 12 55°F 53°F1025.1 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi28 min NW 9.7 G 14 55°F 54°F1026.4 hPa
UPBC1 22 mi48 min W 14 G 16
RTYC1 - 9414523 - Redwood City, CA 25 mi48 min WNW 4.1 G 5.1 56°F 56°F1026.1 hPa (+0.0)
PCOC1 - 9415144 - Port Chicago, CA 26 mi48 min WSW 7 G 9.9 54°F 52°F1024.6 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 31 mi48 min 55°F1025.4 hPa (+0.0)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi48 min WNW 7 G 11 56°F 1024.4 hPa (-0.4)
SFXC1 - San Francisco Bay Reserve, CA 34 mi63 min W 6
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi28 min NW 9.7 G 12 55°F 55°F1026.7 hPa52°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA15 mi55 minW 810.00 miMostly Cloudy57°F51°F81%1025.6 hPa
San Francisco, San Francisco International Airport, CA15 mi1.9 hrsW 910.00 miMostly Cloudy56°F48°F75%1025.5 hPa
Hayward, Hayward Air Terminal, CA21 mi54 minW 510.00 miMostly Cloudy55°F48°F80%1026.4 hPa
Half Moon Bay Airport, CA22 mi53 minNW 53.00 miFog/Mist54°F50°F88%1026.1 hPa
Concord, Buchanan Field, CA23 mi55 minSSW 610.00 miFair56°F48°F75%1023.6 hPa
San Carlos Airport, CA23 mi61 minWSW 610.00 miMostly Cloudy57°F50°F77%1025.7 hPa
Novato / Gnoss Field, CA23 mi73 minVar 59.00 miFair55°F48°F77%1025.4 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW7W8W7S4CalmSE4NW4CalmCalmSE3S3SE4S3SE4SE8SE7S9S11SW9SW5W9W7W9W8
1 day agoW15W19W16W16W16W14CalmCalmS3SE4CalmSE3CalmCalmE3E4E4W8W9W85W11--W12
2 days agoSW8W4W4E3E3E5S6SE5W9CalmSW3W8SW11W8W10W10W10W11W14W14W11W11W12W12

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Tue -- 02:33 AM PST     5.04 feet High Tide
Tue -- 07:17 AM PST     Sunrise
Tue -- 07:46 AM PST     2.65 feet Low Tide
Tue -- 09:40 AM PST     Moonrise
Tue -- 01:28 PM PST     5.29 feet High Tide
Tue -- 05:28 PM PST     Sunset
Tue -- 08:03 PM PST     0.37 feet Low Tide
Tue -- 09:15 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.64.5554.63.93.22.82.72.93.54.24.85.25.24.73.82.61.50.70.40.61.32.2

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Tue -- 12:12 AM PST     2.53 knots Max Flood
Tue -- 03:50 AM PST     -0.00 knots Slack
Tue -- 06:05 AM PST     -1.41 knots Max Ebb
Tue -- 07:17 AM PST     Sunrise
Tue -- 09:14 AM PST     0.00 knots Slack
Tue -- 09:40 AM PST     Moonrise
Tue -- 12:02 PM PST     1.73 knots Max Flood
Tue -- 03:07 PM PST     -0.00 knots Slack
Tue -- 05:28 PM PST     Sunset
Tue -- 06:13 PM PST     -2.24 knots Max Ebb
Tue -- 09:15 PM PST     Moonset
Tue -- 09:46 PM PST     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.52.41.91-0.2-1-1.4-1.2-0.7-0.20.71.41.71.510.1-0.8-1.7-2.2-2-1.4-0.70.31.4

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 (21,6,7,8)
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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.