Friday, January24, 2020
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Marine Weather and Tides
Tamalpais-Homestead Valley, 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 7:19AMSunset 5:25PM Friday January 24, 2020 10:12 AM PST (18:12 UTC) Moonrise 7:26AMMoonset 5:22PM Illumination 0% Phase: New Moon; Moon at 29 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- 848 Am Pst Fri Jan 24 2020
Today..SW winds up to 10 kt. Patchy fog this morning. A slight chance of rain this afternoon.
Tonight..W winds up to 10 kt. A slight chance of rain.
Sat..S winds up to 10 kt. Patchy fog. A chance of rain.
Sat night..SW winds 5 to 15 kt. Rain.
Sun..SW winds 5 to 10 kt. A chance of rain.
Sun night..W winds 5 to 10 kt.
Mon..W winds up to 10 kt.
Tue..W winds up to 10 kt.
PZZ500 848 Am Pst Fri Jan 24 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds today with southerly winds over the northern waters and north to northwest winds over the southern waters. Locally breezy winds are expected along the big sur coast today south of point sur. Winds will then become west to southwest late Saturday and into Sunday as the next system approaches. A long period west to northwest swell will move through the waters peaking today and tomorrow. This will create conditions hazardous to small crafts. Additional long period northwest swells will arrive this weekend and early next week.


7 Day Forecast for Marine Location Near Tamalpais-Homestead Valley, CA
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location: 37.89, -122.57     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 241749 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 949 AM PST Fri Jan 24 2020

SYNOPSIS. Another weak front will pass over the region tonight with some sprinkles possible for the North Bay but mainly dry conditions overall. A warm front will bring some light rain chances to the North Bay late Saturday, spreading south across the rest of the Bay Area Saturday night into early Sunday. Rain amounts will be light overall with a drying trend Sunday afternoon through early next week as temperatures trend to above normal.

DISCUSSION. as of 9:04 AM PST Friday . A weak impulse moving across the North Bay has touched off some showers there, but overall, only a few hundredths of an inch have been picked up in Sonoma and Marin counties. Otherwise, some dense fog is the main weather story this morning. Visibilities in the south and East Bay Valleys have been fluctuating between a few miles to less than 1/4 mile. Some improvement is being indicated at San Jose Airport, now reporting 1 3/4 miles. Salinas and Palo Alto are both reporting 1/4 mile or less. This fog layer is very shallow, and is expected to clear by late morning giving way to mostly sunny skies in most areas. Clouds will increase across the north as the weak system approaches the coast. This is expected to bring light rain to mainly just the North Bay, but only light amounts.

High pressure will briefly rebuild over the area allowing for another round of night/morning fog followed by mild afternoon temperatures on Saturday with highs in the 60s. The ridge will weaken later in the day as a weak front approaches. Light rain chances will return to the North Bay late in the day Saturday. Rain chances increase and eventually spread southward Saturday night through Sunday. Rainfall amounts over the weekend will generally be a few hundredths to a tenth or two. Highest rainfall amounts will be over the North Bay and up to nearly three quarters of an inch there.

Another weak boundary will bring yet another chance for light rain across the North Bay late Monday into Tuesday. Dry weather is then expected for the rest of the week and possibly beyond as a blocking ridge pattern locks in place over the west.

AVIATION. as of 09:49 AM PST Friday . For 18Z TAFs. Patchy dense fog from earlier this morning has begun to clear out with most sites showing improvement in visibility. Expecting the remaining fog and IFR vis to clear out over the next hour or two. Patchy low clouds remain on satellite with observations showing SCT to BKN cigs between 1,000 and 3,000 ft AGL along with additional layers of mid (4,000 to 6,000 ft) and higher level (15,000 to 20,000 ft) clouds. SCT lower cigs likely to continue through much of today before MVFR BKN cigs return this evening as the result of another weak boundary. This will also bring showers back to the North Bay with some guidance suggesting showers as far south as the SF Peninsula, however, has been left out of the tafs for now. Additionally, expect patchy fog again tomorrow morning in the North and East Bay as well as potentially around the Monterey Bay Region. Winds should remain generally light and largely terrain/diurnal driven.

Vicinity of KSFO . Visibility continues to be reduced down to 5-6 SM due to BR. Expecting this to continue over the next few hours, though believe chances for fog have passed. SCT to BKN cigs between 1,000 to 4,000 ft AGL also persist, with BKN cigs forecast to SCT out over the next couple of hours. SCT lower cigs may persist through the evening before MVFR conditions return tonight. Winds are forecast to remain light and generally under 10 kt. This morning winds have been shifting between NE and SE with onshore winds expected this afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Satellite and obs show low clouds and fog continue down the Salinas Valley with little sign of improvement. For now, guidance suggests gradually improving conditions into the early afternoon with VFR prevailing for the afternoon and evening. Low clouds to return this evening and overnight with patchy fog again possible tomorrow morning. Generally light winds through the period with onshore winds expected this afternoon.

MARINE. as of 8:48 AM PST Friday . Generally light winds today with southerly winds over the northern waters and north to northwest winds over the southern waters. Locally breezy winds are expected along the Big Sur Coast today south of Point Sur. Winds will then become west to southwest late Saturday and into Sunday as the next system approaches. A long period west to northwest swell will move through the waters peaking today and tomorrow. This will create conditions hazardous to small crafts. Additional long period northwest swells will arrive this weekend and early next week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm 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: Sims AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 7 mi61 min SE 6 53°F 1023 hPa
46237 - San Francisco Bar, CA (142) 8 mi72 min 53°F7 ft
FTPC1 - 9414290 - San Francisco, CA 8 mi60 min Calm G 1.9 1022.7 hPa
RCMC1 - 9414863 - Richmond, CA 9 mi54 min 53°F
PXSC1 11 mi54 min 53°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi54 min SE 9.9 G 12 51°F 1021.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi54 min SSE 4.1 G 6 54°F 1022.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi60 min SSE 7 G 8
OBXC1 14 mi60 min 52°F 52°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi54 min SSE 6 G 8 1022.6 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi54 min 52°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi42 min WSW 1.9 G 3.9 54°F 54°F1023 hPa
LNDC1 17 mi54 min S 4.1 G 4.1 1022.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi54 min Calm G 1.9 51°F 1022.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 23 mi60 min 53°F1022.2 hPa
UPBC1 26 mi54 min WNW 1.9 G 4.1
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi60 min WSW 2.9 G 4.1 49°F 50°F1022.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 30 mi54 min 49°F
RTYC1 - 9414523 - Redwood City, CA 33 mi54 min S 1.9 G 4.1 1023.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 36 mi87 min SW 7
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi60 min WNW 5.1 G 7 54°F 1022 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi42 min Calm G 3.9 54°F 54°F1022.9 hPa53°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi42 min SE 7.8 G 12 54°F1022.6 hPa
46214 - Point Reyes, CA (029) 47 mi42 min 55°F8 ft

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi77 minN 05.00 miFog/Mist50°F50°F100%1022.7 hPa
San Francisco, San Francisco International Airport, CA22 mi76 minE 73.00 miFog/Mist53°F48°F86%1022.4 hPa
Oakland, Metro Oakland International Airport, CA23 mi79 minSSE 36.00 miPartly Cloudy with Haze55°F50°F83%1022.5 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrS4SW4S5S5S5S5S3SW4S3S3CalmCalmCalmCalmN3CalmCalmS3CalmCalmCalmNE4CalmCalm
1 day agoN63CalmCalm4CalmSE4W4CalmCalmCalmCalmS3CalmS3CalmCalmCalmCalmCalmS5S5S4S4
2 days agoSE7S10S9
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Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
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Sausalito
Click for Map
Fri -- 12:16 AM PST     4.95 feet High Tide
Fri -- 04:58 AM PST     2.90 feet Low Tide
Fri -- 07:20 AM PST     Sunrise
Fri -- 07:24 AM PST     Moonrise
Fri -- 10:48 AM PST     6.30 feet High Tide
Fri -- 01:44 PM PST     New Moon
Fri -- 05:21 PM PST     Moonset
Fri -- 05:24 PM PST     Sunset
Fri -- 05:48 PM PST     -0.76 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.94.84.33.63.12.93.13.84.65.56.16.35.84.83.21.60.2-0.6-0.7-0.30.51.62.84

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
Click for Map
Fri -- 12:47 AM PST     -0.42 knots Max Ebb
Fri -- 03:04 AM PST     0.00 knots Slack
Fri -- 05:16 AM PST     0.82 knots Max Flood
Fri -- 07:19 AM PST     Sunrise
Fri -- 07:24 AM PST     Moonrise
Fri -- 08:25 AM PST     -0.01 knots Slack
Fri -- 12:48 PM PST     -0.98 knots Max Ebb
Fri -- 01:44 PM PST     New Moon
Fri -- 04:00 PM PST     0.01 knots Slack
Fri -- 05:21 PM PST     Moonset
Fri -- 05:23 PM PST     Sunset
Fri -- 06:30 PM PST     1.15 knots Max Flood
Fri -- 10:07 PM PST     -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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-0.4-0.4-0.3-00.50.80.80.60.2-0.2-0.5-0.8-0.9-1-0.8-0.500.71.11.10.90.60.1-0.2

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 Sacramento, 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.