Friday, April10, 2020
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Marine Weather and Tides
Stinson Beach, 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 6:39AMSunset 7:43PM Friday April 10, 2020 11:28 AM PDT (18:28 UTC) Moonrise 10:11PMMoonset 7:41AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 853 Am Pdt Fri Apr 10 2020
Today..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. Mixed swell nw 3 to 5 ft at 12 seconds and sw 2 to 3 ft at 15 seconds.
Tonight..W winds 5 to 15 kt. Wind waves 1 to 2 ft. Mixed swell nw 3 to 4 ft at 10 seconds and sw 2 to 3 ft at 15 seconds.
Sat..SW winds 5 to 10 kt. Wind waves 1 ft. Mixed swell nw 3 to 4 ft at 9 seconds and sw around 2 ft at 15 seconds.
Sat night..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 5 to 6 ft at 9 seconds and sw around 2 ft at 14 seconds.
Sun..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. NW swell 5 to 6 ft at 10 seconds and S around 2 ft at 13 seconds.
Sun night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 5 to 6 ft at 10 seconds and S around 2 ft at 13 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell around 5 ft and sw around 2 ft.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 6 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 15 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 15 seconds. Maximum ebb current of 2.1 kt at 07:25 pm Friday and 4.3 kt at 06:55 am Saturday.
PZZ500 853 Am Pdt Fri Apr 10 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds strengthen to become locally moderate today and through the weekend. The strongest winds today will be in the outer waters north of point reyes as well as along the typical coastal jets near big sur, near davenport off the santa cruz coast, and north of point reyes along the sonoma coast. Northwest winds pick up across the outer waters Saturday and expand to the coast on Sunday. A long period southerly swell will mix with a moderate northwest swell through Friday.


7 Day Forecast for Marine Location Near Stinson Beach, CA
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location: 37.85, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 101742 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1042 AM PDT Fri Apr 10 2020

SYNOPSIS. Band of showers stretching from Santa Clara county southwest towards Monterey county will dissipate shortly after sunrise this morning. Otherwise look for mostly cloudy and continued near or slightly below normal temperatures in the 60s today. A gradual warming trend through the weekend and into early next week with no rain in the forecast at this time. Inland areas will warm into the 70s to around 80 degrees. Long range models indicate light rain chances may return around the weekend of April 18-19th.

DISCUSSION. as of 9:22 AM PDT Friday . Water vapor imagery shows the stubborn upper level low spinning over southern California this morning. Closer to home, a mixture of clouds and sun have been observed with plenty of low- and mid-level remnant moisture. Radar has been switched back to clear-air mode as precipitation chances have diminished across the Bay Area. Afternoon high temperatures will warm by a few/several degrees for most communities this afternoon with widespread 60s expected. Can't rule out a few isolated low 70 reading in the North Bay and in the Salinas Valley. This warming trend will continue into the weekend and into early next week. For additional forecast details, please refer to the previous discussion section.

PREV DISCUSSION. as of 2:45 AM PDT Friday . Band of light showers is stretched across the region from Santa Clara county down along the Big Sur coastline. Light rain started falling just before midnight for places like Watsonville and Monterey with a few hundredths being reported. This jet streak is rotating around the upper low over Southern California and forcing for ascent is modeled to end quickly with most showers ending between 12-14z. Elsewhere skies are mostly cloudy with abundant low level moisture and clouds in place keeping overnight lows mild with 2 am temperatures in the 50s.

The upper low wont bring us any more precip today but model cross sections show plenty of clouds through the day with the most sunshine forecast over the North Bay. The airmass will be modifying as the core of the low slowly exits our region allowing for seasonably mild afternoon highs into the mid and upper 60s.

As the low finally ejects a ridge of high pressure over the Eastern Pacific will nudge towards the coast. A deep trough over the eastern half of the country will keep the ridge axis offshore keeping any serious warming in check. Nonetheless after a relatively cool last few weeks we should see noted warming with highs back into the 70s and even some lower 80s into next week. Onshore flow near the coast will keep lower 60s in place at the beaches with cold sea surface temps around 52-53.

The MJO is forecast to strengthen and move into phase 2 about one week from now with some of the PNA ensembles showing a negative phase heading into next weekend. The operational gfs and ecmwf bring a weak trough onshore for the weekend of April 18-19th while the blend of models has PoPs around 5%.

AVIATION. as of 10:45 AM PDT Friday . for 18Z TAFs. Lingering low level moisture manifesting as widespread stratocumulus across the region late this morning. This has resulted with widespread BKN-OVC decks AOA 2000-3500 ft as many of the terminals and is expected to persist into the afternoon. Brief lifting and reduction in cloud cover possible for inland sites into the mid to late afternoon but a marine stratus deck is forecast to push inland overnight tonight into tomorrow morning. The marine deck is expected to be thick and robust with bases as low as 1500-2000 ft into Saturday morning. Winds generally light to locally breezy onshore, peak winds to around 15kt near the coast this afternoon.

Vicinity of KSFO . Generally MVFR with BKN-OVC bases 2000-3500 feet today, with possible reduction down to FEW-SCT decks into the afternoon. Low clouds associated with marine stratus deck return overnight, with bases down to 1500-2000 feet into sunrise Saturday. Peak onshore winds during the afternoon around 14kt today and tomorrow. Marine layer returns tomorrow night as well.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR. BKN-OVC decks through majority of day around 2500-3500 feet. Light to briefly breezy onshore winds near the coast today. Marine stratus will come in later today with bases down to 1500-2000 feet into sunrise Saturday morning.

MARINE. as of 10:36 AM PDT Friday . Northwest winds strengthen to become locally moderate today and through the weekend. The strongest winds today will be in the outer waters north of Point Reyes as well as along the typical coastal jets near Big Sur, near Davenport off the Santa Cruz coast, and north of Point Reyes along the Sonoma coast. Northwest winds pick up across the outer waters Saturday and expand to the coast on Sunday. A long period southerly swell will mix with a moderate northwest swell through Friday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 4 PM



PUBLIC FORECAST: Rowe/RWW AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 5 mi58 min 56°F4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 11 mi38 min NW 7.8 G 9.7 54°F 53°F4 ft1019.3 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi58 min N 1.9 G 2.9 59°F1018.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi48 min SE 1.9 56°F 1018 hPa
RCMC1 - 9414863 - Richmond, CA 15 mi58 min Calm G 2.9 58°F 57°F1017.7 hPa
PXSC1 15 mi58 min 57°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi58 min N 2.9 G 2.9 56°F 1017.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi58 min SW 4.1 G 5.1 58°F 1018.3 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi58 min WNW 1.9 G 2.9 56°F 1018.1 hPa
OBXC1 18 mi58 min 56°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi58 min WNW 2.9 G 4.1
AAMC1 - 9414750 - Alameda, CA 20 mi58 min W 2.9 G 4.1 57°F 58°F1018.2 hPa
LNDC1 21 mi58 min W 4.1 G 5.1 57°F 1018 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi58 min WSW 2.9 G 5.1 58°F 1017.7 hPa
UPBC1 32 mi58 min WNW 8.9 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi58 min WNW 8.9 G 9.9 57°F 58°F1017.7 hPa
RTYC1 - 9414523 - Redwood City, CA 34 mi58 min NW 7 G 9.9 57°F 61°F1018.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 36 mi58 min W 8 G 9.9 58°F 58°F1017.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi38 min NNW 5.8 G 7.8 54°F 54°F6 ft1019.3 hPa51°F
SFXC1 - San Francisco Bay Reserve, CA 42 mi103 min WSW 1
46214 - Point Reyes, CA (029) 42 mi58 min 54°F6 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi58 min NW 4.1 G 7 62°F 1017.4 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 44 mi38 min WNW 9.7 G 12 53°F5 ft1019.3 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA21 mi53 minNNW 910.00 miFair63°F51°F68%1017.9 hPa
San Francisco, San Francisco International Airport, CA23 mi32 minW 1110.00 miOvercast60°F50°F70%1018.1 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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SE8CalmCalmCalmNW4NW7NW6CalmN6N7NW4CalmCalmCalmCalmNW11
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2 days agoNE4CalmCalmCalmNW9W6NW9NW4W7Calm3E44S4CalmSE4CalmN4N4CalmCalmCalmNW44

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Fri -- 01:24 AM PDT     4.44 feet High Tide
Fri -- 06:41 AM PDT     Sunrise
Fri -- 08:34 AM PDT     -0.53 feet Low Tide
Fri -- 08:40 AM PDT     Moonset
Fri -- 02:38 PM PDT     3.49 feet High Tide
Fri -- 07:42 PM PDT     Sunset
Fri -- 08:32 PM PDT     1.05 feet Low Tide
Fri -- 11:11 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.84.44.43.931.90.90-0.5-0.50.10.91.92.83.43.53.22.621.41.11.11.62.4

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Fri -- 02:11 AM PDT     -0.00 knots Slack
Fri -- 05:15 AM PDT     -2.12 knots Max Ebb
Fri -- 06:41 AM PDT     Sunrise
Fri -- 08:39 AM PDT     Moonset
Fri -- 08:41 AM PDT     0.01 knots Slack
Fri -- 11:44 AM PDT     1.69 knots Max Flood
Fri -- 03:30 PM PDT     -0.00 knots Slack
Fri -- 05:48 PM PDT     -1.25 knots Max Ebb
Fri -- 07:41 PM PDT     Sunset
Fri -- 08:45 PM PDT     0.00 knots Slack
Fri -- 11:10 PM PDT     Moonrise
Fri -- 11:38 PM PDT     1.22 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.80.1-0.8-1.6-2.1-2-1.4-0.60.31.11.61.71.510.4-0.4-1.1-1.2-0.9-0.50.10.71.1

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 (14,3,4,5)
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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.