Sunday, September27, 2020
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Marine Weather and Tides
San Anselmo, 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 7:00AMSunset 7:01PM Saturday September 26, 2020 9:53 PM PDT (04:53 UTC) Moonrise 3:49PMMoonset 12:48AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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- 830 Pm Pdt Sat Sep 26 2020
Tonight..W winds 5 to 15 kt with gusts up to 30 kt. Hazy and patchy smoke.
Sun..SW winds 5 to 10 kt with gusts up to 30 kt. Hazy and patchy smoke.
Sun night..W winds up to 10 kt. Hazy and patchy smoke.
Mon..E winds up to 10 kt. Hazy and patchy smoke.
Mon night..SW winds up to 10 kt. Hazy and patchy smoke.
Tue..NW winds 5 to 15 kt.
Tue night..SW winds 5 to 10 kt.
Wed..SW winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
PZZ500 830 Pm Pdt Sat Sep 26 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North-northwest winds with strong gusts continue this evening, making for hazardous conditions for small craft vessels. Winds will decrease over the southern waters by Sunday afternoon with locally breezy conditions across the northern outer waters into Sunday evening. By Monday, high pressure will shift east allowing the winds to subside. Wind direction will pivot to the north and east Sunday evening before turning southeast on Monday. Northwest swell will gradually subside over the weekend while a light southerly swell also continues.


7 Day Forecast for Marine Location Near San Anselmo, CA
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location: 37.98, -122.54     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 270424 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 924 PM PDT Sat Sep 26 2020

SYNOPSIS. Offshore winds are forecast to develop in the hills of the North and East Bay tonight and Red Flag Warnings go into effect starting at 9 PM. The offshore winds will mix down to the surface on Sunday, resulting in hot and dry conditions across the entire Bay Area with warm temperatures developing south to the Central Coast. A second burst of offshore winds is forecast Sunday night into Monday and Red Flag Warnings remain in effect for the entire North and East Bay through 9 pm Monday. Sunny and hot weather will continue into Monday with near record high temps in the 90s and lower 100s. A Heat Advisory is in effect from 11 am Sunday to 7 pm Monday for all interior portions of the San Francisco Bay Area, as well as the San Francisco Bay Shoreline and City of San Francisco. Coastal areas south of San Francisco may begin to cool by Monday afternoon as southerly winds develop. Much cooler conditions will develop in all coastal areas by Tuesday, with slight cooling expected inland. But inland areas will remain very warm and dry throughout next week.

DISCUSSION. As of 9:20 PM PDT Saturday . Evening water vapor satellite imagery shows an upper trough tracking across the Northern Rockies and over the Northern Great Plains. In the wake of this upper trough, surface high pressure has been building to our north over Oregon and far northern California. The result is a robust 8 mb surface pressure gradient from ACV to SFO which has swept low clouds from nearly our entire coast. Coastal profilers show a well-defined marine inversion at about 800 feet at Fort Ord and less than 500 feet at Bodega Bay. So it's possible we may see some redevelopment of coastal stratus/fog overnight in this shallow marine layer. However, given the strong northerly gradient down the coast and the shallow nature of the marine layer, it's likely that low clouds/fog will only impact the immediate coast tonight, and mainly from Monterey Bay southward.

Primary concerns over the next two days center around heat and offshore winds. Winds in the hills of the North and East Bay will increase and veer from northwest to north overnight as the nocturnal inversion develops and as surface high pressure continues to strengthen to our north and northeast. Expect winds gusts as high as 50 mph across the higher ridges and peaks of the North Bay after midnight tonight, with gusts up to 35 mph in the East Bay Hills. These offshore winds will bring a drier airmass into our region starting tonight. The combination of gusty northerly winds and lack of overnight humidity recovery in the hills will result in critical fire weather conditions. A Red Flag Warning goes into effect for the entire North Bay, as well as the East Bay Hills and Valleys, starting at 9 PM this evening.

A low amplitude upper ridge currently centered offshore along 135W is forecast to shift east and amplify over the next 36 hours. Airmass warming and drying under this ridge will contribute to a strong warming trend across our area on Sunday and Monday. This airmass warming, combined with offshore flow, will mean very warm to hot conditions in most areas, even close to much of our coast, on both Sunday and Monday. Widespread 90s and lower 100s are forecast across most inland areas on Sunday, with upper 70s to lower 90s close to the coast. Even warmer temperatures are forecast for Monday when the heat event is expected to peak. A Heat Advisory is in effect from 11 AM Sunday to 7 PM Monday for the entire San Francisco Bay Area, except the San Mateo County Coast. The Monterey Bay Area southward is not included in the Heat Advisory for a couple of reasons. First, offshore flow is not expected to be as strong farther to the south. Also, southerly flow is forecast to develop along our southern coast by Monday morning, which will result in cooling from Santa Cruz county southward on Monday.

Offshore winds in the hills of the North and East Bay may mix into the valleys by late Sunday morning as the nocturnal inversion breaks. Although winds aren't expected to be all that strong at lower elevations, they will likely be strong enough to result in critical fire weather conditions when combined with the hot temperatures and very low relative humidity. This is why the North and East Bay Valleys are included in the Red Flag Warning. Winds will then increase in the hills again on Sunday night and veer more to the northeast and east and develop close to the North Bay coast. Winds will finally subside in all areas by late Monday morning. However, critical fire weather conditions will persist through late in the day on Monday due to hot and very dry conditions.

As mentioned previously, this upcoming heat event is expected to peak on Monday in most areas, except southern coastal areas due to development of south winds there. By Tuesday, southerly winds are forecast along our entire coast and onshore flow will begin to redevelop at the surface as the upper ridge axis shifts to our east. Thus, all coastal areas are expected to see significant cooling by Tuesday. Inland areas will likely cool too on Tuesday, but by only a few degrees.

Models agree that the upper ridge will remain anchored slightly to our east through the remainder of next week. This will maintain very warm temperatures inland. Weak onshore flow will maintain more mild conditions near the coast.

AVIATION. As of 04:37 PM PDT Saturday . For the 00z TAFs. Passing high clouds over the North Bay, otherwise VFR across the region and expected through the TAF period. While surface winds subside tonight, winds aloft will strengthen and rotate to the NNE, especially over the North and East Bay terminals (KSTS, KAPC, KLVK) for LLWS added to their respective TAFs for overnight and early Sunday morning. Any overnight development of the marine layer is expected to be minimal, limited cloud cover over the area. With northerly winds present, smoke from North California can move into the area for slant range vis issues to increase overnight. There is low confidence in it become dense therefore not currently anticipating significant issues. Winds will remain offshore Sunday and breezy in the afternoon with a few stronger gusts.

Vicinity of KSFO . VFR with a few passing high clouds. Winds remain northwesterly above 20 kts. Stronger gusts up to 30 kts possible up to 3z. May see some haze tonight and tomorrow as winds shift out of the north and bring in wildfire smoke. VFR expected through the TAF period with limited marine layer influence. Winds will ease overnight before becoming breezier Sunday afternoon with little cloud cover.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Stratus is expected to develop over the Bay, but low confidence in it moving over land and impacting terminals overnight and into Sunday morning. Low confidence in slant range vis issues beginning late tonight, but with winds aloft becoming NNE, smoke might move near terminals aloft. Surface winds ease overnight before an afternoon seabreeze on Sunday. VFR forecast Sunday.

CLIMATE. Here are the record high temperatures for Saturday through Monday .

. SATURDAY . SUNDAY . MONDAY SANTA ROSA . 103 in 2009 . 103 in 2010 . 104 in 2010 KENTFIELD . 99 in 2016 . 103 in 1921 . 102 in 1921 NAPA . 105 in 1963 . 101 in 1958 . 102 in 1966 RICHMOND . 97 in 2019 . 97 in 2010 . 97 in 2010 LIVERMORE . 103 in 1952 . 105 in 1963 . 105 in 2010 SAN FRANCISCO . 94 in 1992 . 93 in 2010 . 95 in 1966 SF AIRPORT . 95 in 1958 . 96 in 2010 . 95 in 2010 REDWOOD CITY . 99 in 1963 . 97 in 2010 . 98 in 2010 HALF MOON BAY . 90 in 1970 . 89 in 1966 . 91 in 1958 OAKLAND DOWNTOWN . 93 in 2016 . 95 in 1973 . 92 in 2010 SAN JOSE . 98 in 2016 . 98 in 1921 . 99 in 2010 GILROY . 104 in 1963 . 108 in 1963 . 101 in 1963 SANTA CRUZ . 101 in 1970 . 103 in 2010 . 100 in 1917 SALINAS . 101 in 2016 . 102 in 2010 . 99 in 1970 KING CITY . 105 in 1963 . 107 in 2010 . 102 in 1973

FIRE WEATHER. As of 9:15 PM PDT Saturday . Northeast winds first impact the Napa hills after 9 pm tonight with initial burst of offshore winds staying in the hills. By late Sunday morning the winds may start to mix down into the valleys of the North and East Bay. A second burst of gusty offshore winds are expected in the North and East Bay Hills on Sunday night when very dry conditions will be occurring across the entire region. Northeast to east winds Sunday night into Monday morning will drive all the way to the coast of Sonoma County southward to Half Moon Bay as dry offshore flow spills towards the ocean. Offshore winds are expected to ease in all areas by midday Monday. Heads up on the Dolan Fire Monday as southerly winds are forecast to develop along the Big Sur Coast and Los Padres Forest on Monday. Long range trends remain very warm and dry through early October.

MARINE. As of 8:30 PM PDT Saturday . North-Northwest winds with strong gusts continue this evening, making for hazardous conditions for small craft vessels. Winds will decrease over the southern waters by Sunday afternoon with locally breezy conditions across the northern outer waters into Sunday evening. By Monday, high pressure will shift east allowing the winds to subside. Wind direction will pivot to the north and east Sunday evening before turning southeast on Monday. Northwest swell will gradually subside over the weekend while a light southerly swell also continues.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Red Flag Warning . CAZ505>507-510-511 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 until 3 AM



PUBLIC FORECAST: Dykema AVIATION: DK MARINE: DK FIRE WEATHER: RWW/Dykema

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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 8 mi42 min NW 1.9 71°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi53 min NW 6 G 8 72°F 66°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi53 min WNW 8.9 G 9.9 74°F
FTPC1 - 9414290 - San Francisco, CA 13 mi53 min SSW 8.9 G 12 65°F 62°F
46237 - San Francisco Bar, CA (142) 14 mi53 min 55°F7 ft
PXSC1 14 mi53 min 72°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi53 min Calm G 0 70°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi53 min S 1.9 G 2.9 70°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi53 min WSW 5.1 G 8.9 74°F
OBXC1 16 mi53 min 69°F 60°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 17 mi53 min SSW 2.9 G 4.1
AAMC1 - 9414750 - Alameda, CA 19 mi53 min W 4.1 G 5.1 68°F 70°F
LNDC1 19 mi53 min WSW 5.1 G 5.1 71°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi33 min NW 21 G 27 56°F1014.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi53 min W 8.9 G 9.9 75°F 71°F
UPBC1 23 mi53 min WNW 12 G 16
PCOC1 - 9415144 - Port Chicago, CA 27 mi53 min SSW 5.1 G 8.9 74°F 71°F
SFXC1 - San Francisco Bay Reserve, CA 31 mi68 min ESE 1.9
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 35 mi53 min W 7 G 11 78°F
RTYC1 - 9414523 - Redwood City, CA 37 mi53 min NW 1.9 G 4.1 70°F 73°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 45 mi33 min NW 25 G 31 59°F 53°F1014.8 hPa56°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 47 mi33 min NNW 23 G 29 62°F 1015.1 hPa59°F
46214 - Point Reyes, CA (029) 49 mi27 min 56°F9 ft

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA11 mi78 minNW 1110.00 miMostly Cloudy77°F55°F47%1013.5 hPa
Petaluma Municipal Airport, CA20 mi58 minWSW 610.00 miOvercast72°F55°F57%1014.2 hPa
Napa, Napa County Airport, CA21 mi59 minN 010.00 miFair71°F57°F61%1012.3 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmSE43CalmN9N8NW4
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1 day agoSW9Calm4NE4NE5CalmCalmCalmCalmCalmCalmCalmCalmSE6SW9SW8
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--

Tide / Current Tables for Gallinas Creek, San Pablo Bay, California
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Gallinas Creek
Click for Map
Sun -- 02:49 AM PDT     Moonset
Sun -- 04:44 AM PDT     0.06 feet Low Tide
Sun -- 07:02 AM PDT     Sunrise
Sun -- 11:33 AM PDT     5.27 feet High Tide
Sun -- 05:02 PM PDT     2.11 feet Low Tide
Sun -- 05:24 PM PDT     Moonrise
Sun -- 06:58 PM PDT     Sunset
Sun -- 10:37 PM PDT     5.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.33.11.80.80.20.10.51.32.33.54.55.25.24.73.932.42.12.43.144.95.65.7

Tide / Current Tables for Point San Pablo Midchannel, San Pablo Bay, California Current
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Point San Pablo Midchannel
Click for Map
Sun -- 02:49 AM PDT     Moonset
Sun -- 02:59 AM PDT     -2.84 knots Max Ebb
Sun -- 06:32 AM PDT     0.00 knots Slack
Sun -- 07:02 AM PDT     Sunrise
Sun -- 09:54 AM PDT     2.13 knots Max Flood
Sun -- 12:54 PM PDT     -0.00 knots Slack
Sun -- 03:24 PM PDT     -1.90 knots Max Ebb
Sun -- 05:24 PM PDT     Moonrise
Sun -- 06:02 PM PDT     0.00 knots Slack
Sun -- 06:57 PM PDT     Sunset
Sun -- 09:08 PM PDT     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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-1.1-2-2.6-2.8-2.6-1.7-0.60.41.31.92.11.80.9-0.1-1.2-1.8-1.8-1.1-00.91.51.71.60.9

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
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.