Thursday, July9, 2020
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Marine Weather and Tides
San Rafael, 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 5:54AMSunset 8:36PM Thursday July 9, 2020 12:30 AM PDT (07:30 UTC) Moonrise 10:52PMMoonset 9:21AM Illumination 85% Phase: Waning Gibbous; Moon at 19 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- 829 Pm Pdt Wed Jul 8 2020
Tonight..SW winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt with gusts up to 25 kt.
Fri night..SW winds 5 to 15 kt.
Sat..SW winds 10 to 20 kt with gusts up to 30 kt.
Sat night..SW winds 5 to 10 kt.
Sun..SW winds 5 to 15 kt.
Mon..SW winds 5 to 15 kt.
PZZ500 829 Pm Pdt Wed Jul 8 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds out of the northwest will prevail and remain gusty through tonight as high pressure remains over the eastern pacific. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. Winds will begin to ease Thursday night into Friday over much of the waters, but remain locally breezy over the northern outer waters. Mixed seas will persist with a shorter period wind driven northwest wave and a more moderate period southerly swell.


7 Day Forecast for Marine Location Near San Rafael, CA
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location: 37.98, -122.47     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 090531 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1031 PM PDT Wed Jul 8 2020

SYNOPSIS. A warming and drying trend will occur through the remainder of the work week and into the upcoming weekend, especially across the interior. Meanwhile, seasonable conditions are likely near the coast with periods of night and morning low clouds giving way to mostly sunny afternoon conditions.

DISCUSSION. As of 8:55 PM PDT Wednesday . Skies remain mostly clear this evening except for increasing areas of low clouds near Monterey Bay and a patch of stratus in western San Mateo County. Low clouds are expected to gradually increase along the coast from San Francisco southward overnight, and also develop inland from Monterey Bay. However, a relatively robust 5.0 mb surface pressure gradient from ACV to SFO will likely be sufficient to keep most of the North Bay clear overnight, and limit inland intrusion of low clouds in the SF Bay Area to only a few patches around SF Bay late tonight and early on Thursday. Another limiting factor on inland development of low clouds/fog overnight is the relatively shallow depth of the marine layer - currently just over 1000 feet at Fort Ord.

Models agree that an upper ridge will build over the Desert Southwest through the remainder of the work week, and also expand to the northwest across California, particularly over the upcoming weekend. This will result in a continuation of a gradual warming trend through Sunday. The warming trend will primarily impact inland areas, as persistent onshore surface flow maintains seasonably mild temperatures near the ocean. The gradual warming trend may stall on Friday, or even reverse a few degrees in the North Bay Valleys, when the north-to-south surface pressure gradient weakens. But overall, the trend will be for gradual inland warming, with temperatures expected to peak on Sunday. Lower to mid 90s will become more common across the interior tomorrow, while a few of the warmer spots such as Lake Berryessa and Pinnacles National Park may reach 100. By Sunday, widespread mid to upper 90s are likely in the interior valleys, with the warmest inland valley spots expected to see highs in the 100-107 degree range.

In addition to a warming trend, the airmass over the interior is forecast to become even drier through Sunday. Daytime minimum relative humidity will be as low as the single digits, especially over the weekend, while nighttime humidity recovery in the hills above 1500 feet will be poor. These warm and dry conditions will be a concern from a fire weather perspective. Fortunately, winds are expected to be relatively light through the weekend, except for local moderate and gusty afternoon and evening seabreeze winds.

From Previous Discussion . Medium range forecast guidance and ensembles indicates the ridge of high pressure over the Four Corners will weaken in response to troughing over the Pacific Northwest during the first half of next week. This will result in a cooling trend (most notably across the interior) along with breezy onshore winds.

AVIATION. As of 10:31 PM PDT Wednesday . For 06z TAFs. Patchy cloud cover have moved over coastal terminals, though VFR conditions are still present and forecast through the TAF period; the exception still being near the Monterey Peninsula dropping to IFR later tonight. Onshore winds will prevail through the TAF period with lighter winds overnight and stronger winds Thursday afternoon, with stronger gusts possible, with widespread VFR.

Vicinity of KSFO . FEW cigs at 1200 ft AGL as KHAF is at MVFR. While a few clouds could spill over the Bay, there is low confidence in lower cigs at KSFO for tonight. Winds are still breezy and onshore, though lighter than earlier tonight. VFR is forecast on Thursday with stronger onshore winds with occasional gusts.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR already at KMRY with VFR elsewhere. IFR and even LIFR is possible for terminals closer to the coast. MVFR is expected farther inland with IFR possible. Winds remain onshore and breezy, but will ease overnight. Clouds should mix out by 18z for VFR, with stronger onshore winds Thursday afternoon.

MARINE. as of 8:29 PM PDT Wednesday . Winds out of the northwest will prevail and remain gusty through tonight as high pressure remains over the eastern Pacific. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. Winds will begin to ease Thursday night into Friday over much of the waters, but remain locally breezy over the northern outer waters. Mixed seas will persist with a shorter period wind driven northwest wave and a more moderate period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 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 until 3 AM



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

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 5 mi43 min S 14 G 19 56°F 65°F1011.1 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi33 min SSE 5.1 55°F 1011 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi43 min S 17 G 20 57°F 1011.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 12 mi43 min WSW 6 G 8 61°F 1010.4 hPa
FTPC1 - 9414290 - San Francisco, CA 12 mi43 min SW 6 G 12 55°F 62°F1011.9 hPa
PXSC1 13 mi43 min 57°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 13 mi43 min S 4.1 G 6 55°F 1010.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi43 min SSW 7 G 8.9
OBXC1 14 mi43 min 57°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi43 min SW 4.1 G 7 57°F 1012 hPa
46237 - San Francisco Bar, CA (142) 16 mi61 min 59°F5 ft
LNDC1 16 mi43 min SW 8 G 11 57°F 1012.1 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi43 min WSW 11 G 13 56°F 71°F1012.4 hPa
UPBC1 19 mi43 min WNW 7 G 11
MZXC1 - 9415102 - Martinez-Amorco CA 19 mi43 min WNW 8.9 G 12 64°F 69°F1010.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 23 mi43 min SSW 6 G 12 60°F 70°F1010 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 25 mi141 min NW 12 G 16 53°F 1012.2 hPa51°F
SFXC1 - San Francisco Bay Reserve, CA 28 mi106 min WSW 6
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 31 mi43 min WNW 11 G 15 66°F 1009 hPa
RTYC1 - 9414523 - Redwood City, CA 35 mi43 min WNW 7 G 8.9 60°F 74°F1012.6 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 48 mi151 min NW 23 G 29 1011 hPa (+0.7)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi171 min NNW 14 G 18 1013.2 hPa

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA12 mi36 minNE 410.00 miFair55°F50°F82%1011.2 hPa
Napa, Napa County Airport, CA19 mi37 minSSW 1110.00 miFair60°F53°F78%1010 hPa
Petaluma Municipal Airport, CA20 mi36 minN 09.00 miOvercast55°F53°F94%1011.2 hPa
Concord, Buchanan Field, CA22 mi38 minSSW 1510.00 miFair61°F51°F70%1009.1 hPa
Oakland, Metro Oakland International Airport, CA23 mi38 minSW 710.00 miMostly Cloudy59°F52°F78%1012.7 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE65CalmSW13SW13SW12S9S63E4E3CalmNW3
1 day agoE4Calm3CalmCalmCalmCalmCalm3Calm45SW9SW12SW12SW12SW12
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SW10SW10S5SE3E4CalmCalm
2 days agoN5CalmCalmCalmCalmCalmCalmCalmCalmS7
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Tide / Current Tables for Point San Quentin, San Francisco Bay, California
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Point San Quentin
Click for Map
Thu -- 03:06 AM PDT     5.39 feet High Tide
Thu -- 05:55 AM PDT     Sunrise
Thu -- 10:02 AM PDT     -0.22 feet Low Tide
Thu -- 10:21 AM PDT     Moonset
Thu -- 05:13 PM PDT     4.94 feet High Tide
Thu -- 08:34 PM PDT     Sunset
Thu -- 10:35 PM PDT     2.63 feet Low Tide
Thu -- 11:51 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.74.55.15.45.24.53.42.10.90.1-0.200.71.72.83.84.64.94.84.33.73.12.72.7

Tide / Current Tables for Point San Pablo Midchannel, San Pablo Bay, California Current
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Point San Pablo Midchannel
Click for Map
Thu -- 02:06 AM PDT     1.66 knots Max Flood
Thu -- 05:03 AM PDT     -0.00 knots Slack
Thu -- 05:55 AM PDT     Sunrise
Thu -- 08:27 AM PDT     -2.90 knots Max Ebb
Thu -- 10:20 AM PDT     Moonset
Thu -- 12:31 PM PDT     0.00 knots Slack
Thu -- 03:52 PM PDT     1.87 knots Max Flood
Thu -- 07:16 PM PDT     -0.00 knots Slack
Thu -- 08:34 PM PDT     Sunset
Thu -- 09:44 PM PDT     -1.40 knots Max Ebb
Thu -- 11:51 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.31.71.50.90-1.2-2.3-2.8-2.8-2.5-1.7-0.60.51.31.81.91.71.10.2-0.7-1.3-1.4-1.1

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 (3,6,7,8)
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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.