Friday, January22, 2021
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Marine Weather and Tides
Brisbane, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:18AMSunset 5:24PM Friday January 22, 2021 8:52 AM PST (16:52 UTC) Moonrise 12:37PMMoonset 1:59AM Illumination 69% 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- 842 Am Pst Fri Jan 22 2021
Today..W winds 10 to 15 kt. Gusts up to 25 kt this afternoon. Showers and a slight chance of Thunderstorms.
Tonight..N winds 5 to 15 kt. A slight chance of showers.
Sat..N winds up to 10 kt.
Sat night..W winds up to 10 kt.
Sun..W winds 5 to 10 kt. Rain likely.
Sun night..NW winds 15 to 25 kt with gusts up to 30 kt. Rain likely.
Mon..NW winds 10 to 20 kt with gusts up to 25 kt.
Tue..S winds 10 to 20 kt with gusts up to 25 kt. Rain. Winds and wind waves higher in and near Thunderstorms.
PZZ500 842 Am Pst Fri Jan 22 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A cold front continues to sweep through the coastal waters this morning. The passing cold front will bring gusty northerly winds, scattered showers and possibly an afternoon Thunderstorms. Unsettled weather will continue through much of the forecast period as a series of storms move through the region. The next one being on Sunday and into Monday. This front will be accompanied by widespread gusty winds with gale force conditions possible Sunday night into Monday morning. Another storm system is then expected mid next week. Moderate northwest swell will persist as a couple additional northwest swells arrive today and then on Sunday.


7 Day Forecast for Marine Location Near Brisbane, CA
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location: 37.67, -122.38     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 221151 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 351 AM PST Fri Jan 22 2021

SYNOPSIS. A significant shift in the weather pattern will bring rain showers and much cooler temperatures to the region today. After a brief break on Saturday, more widespread rainfall is expected late in the weekend with colder temperatures and lowering snow levels. Unsettled weather is likely to continue into next week with a potential atmospheric river arriving during midweek.

DISCUSSION. as of 3:45 AM PST Friday . More typical winter- like weather is making a return to the Bay Area as a mid/upper level low approximately 275 miles to the north-northwest of San Francisco drops southward along the coast today. Regional radars and surface observations indicate isolated to scattered rain showers are moving into the North Bay and will soon reach the San Francisco Peninsula within the next few hours. These showers are generally producing rainfall rates of a few hundredths to 0.10" per hour and will continue to spread across the Bay Area and then over the Central Coast through sunrise as a cold front pushes inland. Cannot rule out isolated showers producing up to 0.25" per hour at times. As the core of the mid/upper level low approaches the Bay Area late this morning, more widely scattered showers are expected over the region and will continue through the afternoon. Given the colder air mass aloft, instability will increase enough to produce the potential for isolated thunderstorms. Locally heavier rainfall, small hail and brief gusty winds will likely accompany any heavier showers/thunderstorms from late morning into the afternoon. Rain showers will diminish from north to south with only lingering showers remaining over the Central Coast tonight. Rainfall with this first system will likely range from 1/10" up to 1/3" for the lower elevations/urban areas while isolated pockets of 1/2" to 3/4" cannot be ruled out within heavier showers/thunderstorms. As mentioned earlier, this system will advect much cooler air into the region resulting in daytime temperatures only warming into the low/mid 50s (40s in the hills, ridges and peaks). Snow levels will gradually lower to < 4,000 ft late in the day allowing for the potential for a few snow showers in the region's highest peaks. The primary hazard today will likely be slick roadways after the recent prolonged dry stretch and of course any impacts associated with isolated thunderstorms that may develop.

Tonight will be mostly dry with temperatures dropping into the 30s to lower 40s for much of the region. Cannot rule out near freezing temperatures in the region's coldest interior valleys, especially where sky conditions clear and winds diminish. Saturday looks to be mostly sunny and slightly warmer (mid/upper 50s) in wake of the exiting system.

The next storm system will arrive Sunday into Monday with a reinforcing shot of colder air, widespread moderate rainfall and breezy winds along the coast and over the higher peaks. Rainfall amounts are forecast to be similar to locally greater than today's system, yet primarily beneficial with limited hazards. This system however will be accompanied lowering snow levels which are forecast to drop to < 2,000 ft over the Bay Area and <2,500 ft over the Central Coast by Sunday night/Monday morning. The longer post frontal showers linger over the region will determine how much snowfall will occur over the region's ridges and peaks. Even colder surface temperatures are also expected Sunday through Tuesday with daytime highs generally in the lower 50s and overnight lows in the 30s to lower 40s. More widespread freezing temperatures will be possible away from the immediate coast.

While a few showers may linger Monday into Monday night, widespread rainfall does not appear likely during this time frame. This will be the brief break before a more potent weather system arrives Tuesday into Wednesday. Ensembles have been consistent in showing the arrival of a weak to potentially moderate atmospheric river advecting inland from late Tuesday and persisting into Thursday. There remains some differences in the deterministic models regarding the exact timing and trajectory of this system, however confidence continues to increase that the region will see more widespread, moderate to heavy rainfall (especially along the coastal ranges). The current thinking is that rainfall amounts of 1.00" to 3.00" will be possible midweek for most urban areas while higher elevations would likely receive double that. As always with atmospheric rivers, isolated rainfall amounts may be greater in the orographically enhanced coastal slopes and lesser in the rain shadowed valleys. This event will be closely monitored in the coming days as this amount of precipitation would greatly increase the potential for mud and rock slides across steeper terrain as well as widespread nuisance type flooding in lower lying, poorly drained areas. Additionally, any high intensity rain rates could potentially trigger debris flows in recent burn areas. One last think to keep in mind is strong southerly winds ahead of the approaching atmospheric river that may topple trees and/or power lines.

Cool, unsettled conditions will potentially continue at times through late next week and into the following weekend as the storm track remains active over the region. Be sure to stay tuned in the coming days as we fine tune the forecast!

AVIATION. as of 3:35 AM PST Friday . For the 12Z TAFs. Mixed conditions this morning as low clouds slowly fill in while a cold front moves through the region. Observations show cig heights between 1,000 to 3,000 generally with an additional layer of mid level clouds around 5,000 to 8,000 ft AGL. The main boundary should still have passed by about 16z with an additional round of showers after 18z that may be accompanied by scattered thunderstorms. Generally MVFR conditions prevailing into this afternoon before cigs lift and showers exit. Slight possibility of some patchy fog over the North Bay once the front has passed and low level moisture lingers. S/SW winds this morning as the front passes before winds turn more W/NW behind the front.

Vicinity of KSFO . MVFR through this afternoon as showers move through. A slight chance of thunderstorms after 18z with lingering showers into the afternoon. Slight chance of MVFR cigs overnight, though confidence is low. S/SW winds this morning turning W/NW behind the front. Winds may be locally breezy during the frontal passage.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR/VFR as showers approach, temporary IFR cigs/vis possible with heavier showers. Slight chance of thunderstorms this afternoon. Expecting VFR conditions to return this afternoon with lowering cigs possible overnight. S/SW winds this morning with locally breezy conditions along the coast. Breezy W/NW winds behind the front this afternoon. Showers will linger behind the system into tonight, but become more widely scattered.

MARINE. as of 02:00 AM PST Friday . Expect gusty winds, showers, and a slight chance of scattered thunderstorms this morning and into the afternoon as a cold front moves through the waters. Unsettled weather will continue through much of the forecast period as a series of storms move through the region. The next one being on Sunday and into Monday. This front will be accompanied by widespread gusty winds with gale force conditions possible Sunday night into Monday morning. Another storm system is then expected mid next week. Moderate northwest swell will persist as a couple additional northwest swells arrive today and then on Sunday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Mry Bay from 6 AM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 6 AM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 8 AM SCA . Pt Reyes to Pigeon Pt 0-10 nm



PUBLIC FORECAST: RGass AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 8 mi58 min W 4.1 G 7 49°F 53°F1013.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 9 mi58 min WSW 7 G 7
PXSC1 9 mi58 min 51°F 49°F
OBXC1 9 mi58 min 50°F 48°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 9 mi58 min WSW 5.1 G 8.9 49°F 1012.1 hPa
FTPC1 - 9414290 - San Francisco, CA 10 mi58 min WSW 6 G 12 50°F 53°F1013.3 hPa
LNDC1 10 mi58 min WSW 4.1 G 6 50°F 1013.4 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi58 min WSW 2.9 G 5.1 49°F 1013.4 hPa
RTYC1 - 9414523 - Redwood City, CA 14 mi58 min S 2.9 G 5.1 49°F 54°F1014.5 hPa
46237 - San Francisco Bar, CA (142) 16 mi52 min 52°F6 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 16 mi71 min Calm 48°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi58 min SW 6 G 9.9 51°F 1013.5 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi58 min SW 5.1 G 8.9 50°F 53°F1013 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 25 mi32 min W 14 G 18 53°F1013.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi58 min SW 12 G 16 50°F 1012.6 hPa
UPBC1 29 mi58 min WSW 11 G 16
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi58 min SW 9.9 G 13 49°F 52°F1013.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 32 mi58 min SW 8.9 G 11 47°F 52°F1012.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi42 min W 14 G 19 52°F 1014.5 hPa47°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 37 mi58 min W 5.1 G 8 49°F 1012.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 41 mi67 min W 4.1 44°F 1013 hPa41°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA4 mi56 minWSW 1210.00 miPartly Cloudy51°F43°F74%1013.5 hPa
Oakland, Metro Oakland International Airport, CA9 mi59 minSW 810.00 miMostly Cloudy54°F44°F69%1013.7 hPa
San Carlos Airport, CA12 mi57 minSSW 510.00 miPartly Cloudy48°F45°F87%1014.2 hPa
Half Moon Bay Airport, CA13 mi57 minNNW 55.00 miFog/Mist48°F46°F94%1014.2 hPa
Hayward, Hayward Air Terminal, CA14 mi58 minSSW 710.00 miLight Rain50°F43°F77%1014.4 hPa
Palo Alto Airport, CA19 mi65 minVar 410.00 miMostly Cloudy46°F45°F93%1014.2 hPa
Mountain View, Moffett Field, CA24 mi62 minS 410.00 miMostly Cloudy48°F46°F94%1014.2 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW3N4N3NW8NW11NW10NW7NW14NW16NW8W9NW3W4SW4SE5CalmSE3SE6SE7N14
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1 day agoSE3E3E5N3N3NE3NE3CalmW11W9W11W11W10NW4CalmNW3CalmW6W3W4W8W6CalmW7
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Tide / Current Tables for Oyster Point Marina, San Francisco Bay, California (3)
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Oyster Point Marina
Click for Map
Fri -- 12:44 AM PST     2.59 feet Low Tide
Fri -- 01:59 AM PST     Moonset
Fri -- 06:59 AM PST     6.83 feet High Tide
Fri -- 07:20 AM PST     Sunrise
Fri -- 12:37 PM PST     Moonrise
Fri -- 02:37 PM PST     0.96 feet Low Tide
Fri -- 05:22 PM PST     Sunset
Fri -- 09:21 PM PST     4.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.72.633.74.85.86.56.86.65.94.83.62.41.5111.42.12.93.74.34.64.64.2

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Fri -- 01:21 AM PST     0.00 knots Slack
Fri -- 01:59 AM PST     Moonset
Fri -- 04:26 AM PST     0.59 knots Max Flood
Fri -- 07:20 AM PST     Sunrise
Fri -- 07:26 AM PST     -0.00 knots Slack
Fri -- 10:50 AM PST     -0.98 knots Max Ebb
Fri -- 12:36 PM PST     Moonrise
Fri -- 02:38 PM PST     0.01 knots Slack
Fri -- 05:22 PM PST     Sunset
Fri -- 05:54 PM PST     0.70 knots Max Flood
Fri -- 08:56 PM PST     -0.00 knots Slack
Fri -- 11:18 PM PST     -0.43 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-0.10.20.40.60.60.40.2-0.2-0.6-0.9-1-0.9-0.7-0.30.10.50.70.70.60.3-0-0.3-0.4

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.
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Disclaimer:
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.