Saturday, March28, 2020
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Marine Weather and Tides
Bolinas, 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 6:58AMSunset 7:30PM Saturday March 28, 2020 10:43 AM PDT (17:43 UTC) Moonrise 8:30AMMoonset 10:46PM Illumination 21% Phase: Waxing Crescent; Moon at 5 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- 801 Am Pdt Sat Mar 28 2020
Today..SW winds up to 10 kt. Wind waves 1 ft. W swell 2 to 3 ft at 8 seconds. Rain.
Tonight..SW winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 8 seconds. Rain likely.
Sun..SW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 8 seconds. Rain likely.
Sun night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 4 to 5 ft at 7 seconds.
Mon..W winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 8 seconds.
Mon night..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 10 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft.
Wed..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 6 to 8 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 5 ft with a dominant period of 8 seconds. Across the bar...seas 5 to 6 ft with a dominant period of 8 seconds. Maximum ebb current of 1.2 kt at 08:31 pm Saturday and 3.0 kt at 07:49 am Sunday.
PZZ500 801 Am Pdt Sat Mar 28 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will shift into the southern california waters as a low pressure system moves into waters off the coast of the pacific northwest. This will keep winds generally light through the weekend and into early next week. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.


7 Day Forecast for Marine Location Near Bolinas, CA
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location: 37.67, -123.15     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 281731 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1031 AM PDT Sat Mar 28 2020

SYNOPSIS. Light rain showers on and off today for the Bay Area under cloudy skies. There may be a brief lull in showers tonight before the cold front arrives with another round of organized, mainly light rainfall Sunday morning into Sunday afternoon. Skies turn partly cloudy and showers end by Sunday evening. High pressure builds next week with a warming and drying trend.

DISCUSSION. as of 8:54 AM PDT Saturday . Radar continues to show widespread light rain across the region with most Bay Area locations reporting some light rain so far this morning. The system is weak and disorganized and we are currently in the warm advection region which is driving ascent and leading to the precip. There may be a brief lull in precip later this afternoon and evening but still need to hold onto light rain chances through tonight. Sunday morning the surface cold front and trough of cold air aloft will pass through the region. This will lead to a more organized period of rainfall for Sunday morning into early Sunday afternoon as the front moves through. Rain totals 0.25-0.50 on average with 0.10-0.25 for the interior valleys by Sunday evening.

The front is out of the region with dry conditions Sunday night. One fly in the ointment we'll have to monitor is the last few model runs of the NAM bring another shot of light rain to the North Bay on Monday. Will fine tune forecast on those details for this afternoon but high confidence for dry weather south of the Golden Gate on Monday with any North Bay rain on Monday being very light.

Increasing confidence that a prolong period of dry weather returns for the first week of April though longer range trends suggest more precip is possible beyond day 10.

AVIATION. as of 10:31 AM PDT Saturday . For 18z tafs. Radar is still picking up scattered showers across the region. Expect periods of showers to continue on and off throughout the day before another round of more steady precipitation arrives with a secondary boundary tomorrow morning. Borderline MVFR/VFR cigs expected today with current observations showing layers of SCT to BKN cigs between 2,000 and 7,000 ft AGL. S/SE winds expected this morning to remain generally under 10 kt, through short durations at or just above 10 kt will be possible. Latest guidance this morning has backed off on winds shifting to the SW/W this afternoon for some sites. S/SE winds may persist through tomorrow morning for those locations.

Vicinity of KSFO . Light scattered showers on and off throughout the day with borderline MVFR/VFR cigs. Current obs show BKN cigs between 3,500 and 5,000 ft. Periods of MVFR cigs will be possible today, though confidence is low on exact timing and duration. S/SE winds to persist today with winds now expected to increase to 10 kt this afternoon. Latest guidance has backed off on a transition to SW/W winds later today, but should conditions change the taf will be amended. Additional round of more steady showers expected tomorrow morning as a secondary boundary moves through.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with periods of MVFR conditions and showers this afternoon. MVFR conditions expected this evening and overnight. Additional round of steady showers tomorrow morning. S/SE winds 5-10 kt this morning becoming W/SW in the afternoon. SE winds to return this evening and become locally breezy down the Salinas Valley in the morning.

MARINE. as of 08:20 AM PDT Saturday . High pressure will shift into the southern California waters as a low pressure system moves into waters off the coast of the Pacific Northwest. This will keep winds generally light through the weekend and into early next week. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: RWW AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi44 min SSE 3.9 G 3.9 52°F 55°F1024.3 hPa (+1.3)
46214 - Point Reyes, CA (029) 25 mi44 min 54°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 26 mi44 min SSW 3.9 G 3.9 54°F 56°F1024.3 hPa48°F
46237 - San Francisco Bar, CA (142) 28 mi44 min 55°F3 ft
FTPC1 - 9414290 - San Francisco, CA 37 mi56 min 58°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi52 min SE 5.1 51°F 1024 hPa (+1.0)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 41 mi44 min E 3.9 G 3.9 54°F1023.8 hPa (+1.1)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 41 mi56 min E 6 G 7 52°F 1022.5 hPa
PXSC1 41 mi56 min 53°F 53°F
RCMC1 - 9414863 - Richmond, CA 43 mi56 min SE 2.9 G 6 52°F 56°F1023.3 hPa
OBXC1 44 mi56 min 52°F 52°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi56 min SE 5.1 G 7 51°F 1023.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 44 mi62 min SE 5.1 G 7
PPXC1 - 9414847 - Richmond (Point Potrero), CA 45 mi56 min SE 6 G 8 52°F 1023.9 hPa
AAMC1 - 9414750 - Alameda, CA 46 mi56 min ESE 6 G 8.9 51°F 57°F1023.7 hPa
LNDC1 47 mi56 min ESE 4.1 G 7 51°F 1023.6 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA42 mi48 minSE 48.00 miOvercast53°F48°F83%1023.5 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Tide / Current Tables for Southeast Farallon Island, California
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Southeast Farallon Island
Click for Map
Sat -- 01:40 AM PDT     5.04 feet High Tide
Sat -- 07:02 AM PDT     Sunrise
Sat -- 08:26 AM PDT     0.53 feet Low Tide
Sat -- 09:29 AM PDT     Moonrise
Sat -- 02:56 PM PDT     3.81 feet High Tide
Sat -- 07:31 PM PDT     Sunset
Sat -- 08:13 PM PDT     2.35 feet Low Tide
Sat -- 11:46 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.44.954.73.92.91.810.60.61.11.72.53.23.73.83.73.32.92.52.42.52.93.5

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Sat -- 12:04 AM PDT     0.68 knots Max Flood
Sat -- 02:51 AM PDT     -0.00 knots Slack
Sat -- 06:12 AM PDT     -1.11 knots Max Ebb
Sat -- 07:02 AM PDT     Sunrise
Sat -- 09:29 AM PDT     Moonrise
Sat -- 09:51 AM PDT     0.00 knots Slack
Sat -- 12:50 PM PDT     0.77 knots Max Flood
Sat -- 04:13 PM PDT     -0.00 knots Slack
Sat -- 06:40 PM PDT     -0.65 knots Max Ebb
Sat -- 07:32 PM PDT     Sunset
Sat -- 09:34 PM PDT     0.00 knots Slack
Sat -- 11:46 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.3-0.1-0.5-0.9-1.1-1-0.7-0.30.10.40.70.80.60.40.1-0.3-0.6-0.6-0.4-0.10.10.3

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.
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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 San Francisco Bay Area, CA
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Disclaimer:
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.