Monday, April19, 2021
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Marine Weather and Tides
Stinson Beach, CA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:26AMSunset 7:51PM Monday April 19, 2021 2:45 PM PDT (21:45 UTC) Moonrise 10:41AMMoonset 1:10AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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- 200 Pm Pdt Mon Apr 19 2021
.small craft advisory in effect through late Tuesday night...
Tonight..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 9 to 10 ft, increasing to 10 to 12 ft after midnight. SWell sw around 2 ft at 15 seconds.
Tue..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 10 to 12 ft.
Tue night..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 4 to 5 ft. W swell 9 to 11 ft at 11 seconds.
Wed..W winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 7 to 9 ft at 11 seconds.
Wed night..W winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 7 to 9 ft at 10 seconds.
Thu..SW winds 5 to 15 kt. Wind waves 1 ft. W swell 6 to 8 ft at 10 seconds.
Thu night..W winds 10 to 20 kt. Wind waves 2 to 3 ft. NW swell 5 to 7 ft at 9 seconds and sw around 2 ft at 18 seconds.
Fri..W winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft and sw 2 to 3 ft.
Sat..SW winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 3 ft. A chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...northwest seas 3 to 5 ft, with a dominant period of 11 seconds. Across the bar...northwest seas 4 to 6 ft, with a dominant period of 11 seconds. Maximum ebb current of 0.7 kt at 12:07 am Tuesday and 1.9 kt at 10:49 am Tuesday.
PZZ500 200 Pm Pdt Mon Apr 19 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Buoy observations show moderately gusty northwest winds, with near gale force gusts in the coastal waters south of point sur. Gale force gusts are expected to develop over the northern waters this evening. Gusty winds will persist through Tuesday evening. These winds will produce steep wind waves resulting in hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.


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 192101 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 201 PM PDT Mon Apr 19 2021

SYNOPSIS. A cooling trend will continue into Tuesday with temperatures falling back to near seasonal averages for the remainder of the week. The weekend will bring cooler temperatures and increasing chances for precipitation from late Saturday or early Sunday through Monday.

DISCUSSION. as of 01:58 PM PDT Monday . The marine layer over the Central Coast has deepened today with stratus holding strong along the San Francisco Peninsula coastline down through the Monterey Bay region. Meanwhile, sky conditions have cleared inland with temperatures warming into the 60s and 70s away from the marine influences. Overall, maximum temperatures this afternoon will be cooler region-wide as the air mass aloft cools due to the flattening ridge.

Low clouds will once again penetrate inland overnight, especially around the Central Coast and into the Salinas Valley. However, expecting less widespread low clouds over the greater San Francisco Bay Area in general. This will be the result of increased northwest flow as a mid/upper level trough extends southward over the region. This too will allow for the cooling trend to continue into Tuesday afternoon with temperatures likely to drop back to near seasonal averages (lower 60s coast to low/mid 70s inland). Additionally, precipitation associated with this system is not anticipated to bring widespread rainfall to the region. Little change likely through mid/late week as troughing over the West maintains near seasonal temperatures with periods of night/morning low clouds.

Additional cooling is then expected on Saturday as an upper level low approaches the Pacific Northwest. As the system deepens and drops down the West Coast, forecast ensembles continue to indicate increased potential for widespread light to moderate rainfall across northern and central California from either late Saturday night or Sunday through Monday. Given we are still five to six days out, will remain guardedly optimistic and continue to monitor the latest forecast data in the coming days.

AVIATION. As of 11:30 AM PDT Monday . For the 18Z TAFs. Most inland sites VFR, with coastal sites at MVFR/IFR. Improvements to VFR for coastal sites should be seen by 19-20Z. KMRY could see MVFR until 20Z. VFR conditions around the area after 21Z and lasting through 06-08Z tonight. W/NW winds breezy this afternoon, around 10-15kts. Gusts between 20-25 kt possible, generally, through early tomorrow morning with stronger gust potential for SFO. Winds will remain light to moderately breezy through the night for most areas, preventing FG/BR for KSTS/KAPC Tuesday morning.

Vicinity of KSFO . Satellite shows cloud deck mixing out quickly, with skies FEW-SCT at 080-013. Skies will clear up this afternoon. W/NW winds will increase this afternoon to 20-25+ knots lasting through Tuesday evening. Strongest gusts will be from 09-12Z this morning, with models hinting at G30kts. Will be monitoring for AWW criteria. Winds will relax to 15G20kts for the remainder of Tuesday. Low clouds will return tonight, with prevailing deck SCT010-015.

SFO Bridge Approach . Stratus deck will fill in from 09-16Z, with more confidence for SCT-BKN cigs at 010-015.

Monterey Bay Terminals . The marine layer is about an hour away from scattering out, with KSNS seeing SCT013 already. VFR conditions expected this afternoon before low clouds return this evening and tonight. Light winds this morning increasing this afternoon to around 15 kt. Breezy conditions may linger into the evening.

MARINE. as of 11:28 AM PDT Monday . Northwest winds will increase through the day as a disturbance moves southward from the Pacific Northwest into northern California. Gale force gusts are expected to develop over portions of the coastal waters starting with the Big Sur Coast by late this afternoon before winds increase over the northern waters this evening and persist into Tuesday. These winds will produce steep wind waves resulting in hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Mry Bay SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Arena to Pt Reyes 0-10 nm until 9 PM SCA . Pt Arena to Pigeon Pt 10-60 nm until 9 PM GLW . Pt Arena to Pigeon Pt 10-60 nm from 9 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm GLW . Pt Arena to Pt Reyes 0-10 nm from 9 PM



PUBLIC FORECAST: RGass AVIATION: Dhuyvetter MARINE: Dhuyvetter

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Weather Reporting Stations
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Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA21 mi50 minSW 12 G 1710.00 miFair73°F48°F41%1017.6 hPa
San Francisco, San Francisco International Airport, CA23 mi49 minW 169.00 miA Few Clouds60°F46°F60%1019.5 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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N16N8--N3N5N3N4NW4CalmCalmCalmCalmCalmCalmCalmCalmSE4
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Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Mon -- 02:10 AM PDT     Moonset
Mon -- 04:16 AM PDT     3.35 feet High Tide
Mon -- 06:29 AM PDT     Sunrise
Mon -- 11:40 AM PDT     Moonrise
Mon -- 12:23 PM PDT     0.12 feet Low Tide
Mon -- 07:50 PM PDT     2.87 feet High Tide
Mon -- 07:50 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.32.73.13.33.332.621.30.70.30.10.20.50.91.522.52.82.92.82.52.3

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Mon -- 02:08 AM PDT     Moonset
Mon -- 02:32 AM PDT     0.41 knots Max Flood
Mon -- 05:15 AM PDT     -0.00 knots Slack
Mon -- 06:29 AM PDT     Sunrise
Mon -- 09:02 AM PDT     -1.28 knots Max Ebb
Mon -- 11:40 AM PDT     Moonrise
Mon -- 12:57 PM PDT     0.00 knots Slack
Mon -- 04:11 PM PDT     0.92 knots Max Flood
Mon -- 07:49 PM PDT     Sunset
Mon -- 08:08 PM PDT     -0.00 knots Slack
Mon -- 09:56 PM PDT     -0.48 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.20.40.40.30.1-0.2-0.7-1.1-1.3-1.1-0.8-0.400.50.80.90.90.70.50.1-0.3-0.5-0.4

Weather Map
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GEOS Local Image of CentralWestCoast    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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