Friday, January17, 2020
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Marine Weather and Tides
Muir 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 7:21AMSunset 5:18PM Friday January 17, 2020 8:44 AM PST (16:44 UTC) Moonrise 12:17AMMoonset 12:03PM Illumination 51% Phase: Third Quarter Moon; Moon at 22 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- 250 Am Pst Fri Jan 17 2020
Today..E winds up to 10 kt, becoming S this afternoon. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 12 seconds.
Tonight..E winds up to 10 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 11 seconds.
Sat..NE winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 4 to 6 ft at 10 seconds.
Sat night..NE winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 5 to 7 ft at 14 seconds.
Sun..NE winds 5 to 15 kt. Wind waves around 2 ft. W swell 9 to 11 ft at 15 seconds.
Sun night..NW winds up to 10 kt. Wind waves 2 to 3 ft. W swell 7 to 9 ft at 14 seconds.
Martin luther king jr day..S winds 5 to 15 kt. Wind waves 3 to 4 ft. W swell 6 to 8 ft. Showers likely.
Tue..SW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 8 to 10 ft. Showers likely.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 6 to 8 ft with a dominant period of 12 seconds. Across the bar...seas 7 to 9 ft with a dominant period of 12 seconds. Maximum ebb current of 2.4 kt at 09:49 am Friday and 2.1 kt at 10:13 pm Friday.
PZZ500 250 Am Pst Fri Jan 17 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will build over the area today while a low pressure system spins over the pacific northwest offshore waters. This will bring light south winds to the northern waters and light north winds to the southern waters through Saturday. Breezy southeast winds will develop Monday as a frontal system approaches. A moderate northwest swell will arrive late Saturday and Sunday while a larger northwest swell arrives the middle of next week.


7 Day Forecast for Marine Location Near Muir Beach, CA
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location: 37.78, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 171156 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 356 AM PST Fri Jan 17 2020

SYNOPSIS. Isolated showers will end by around sunrise across the Central Coast. High pressure builds Friday leading to dry and seasonable weather. Quiet weather continues Saturday and Sunday with plenty of sunshine and daytime highs in the 50s. Increasing clouds by Monday leading to a chance of light rain later Monday into Tuesday.

DISCUSSION. as of 2:32 AM PST Friday . Isolated showers continue early this morning, mainly over the ocean and along the Central Coast. For the most part shower activity will end by 12-14z. Will watch and update the forecast by that time should isolated shower chances need to be extended. We are quickly transitioning to weak ridging behind yesterdays cold frontal passage. Look for filtered sunshine today with generally light winds as afternoon highs top out in the mid and upper 50s. After yesterdays active weather it will be a quiet end to the work week with some snow covered hills likely visible this morning.

Will have to be on the lookout for some dense valley fog formation tonight as the boundary layer is moist with inversions building. The flow at the surface may turn light offshore allowing for any Central Valley fog to flow towards the Delta by early Saturday morning. Outside of fog expect sunny and seasonably mild weather for Saturday and Sunday with highs 55-60 and overnight lows 35-45 on average.

Blended/ensemble models bring a chance of rain showers by Monday afternoon while deterministic models remain dry until later Monday night into Tuesday. Official forecasts will show some rain chances Monday afternoon but confidence is low with better chances for some light rain by Tuesday. The pattern is such that any fronts bringing rain early next week would mainly bring light rain with the best chances from the Bay Area northward.

Long range trends remain difficult to pinpoint. A few days ago the pattern was looking drier but latest trends show us returning to the pattern of earlier this month where weak systems skirt Northern California bringing light rain chances. Not seeing any strong storms in the extended but no persistent mid-winter ridge either. The PNA pattern is transitioning from strongly negative (cool and showery) but forecast to oscillate between neutral and slightly negative next week. The MJO is fairly active out in phase 6-7 but currently forecast to fade before making it into phase 8 by the gefs plumes so not expecting that to drive the long range trends. Will take what we can in terms of rainfall through the end of the month and see what February brings.

AVIATION. as of 3:57 AM PST Friday . Scattered showers have decreased and should not impact the terminals this morning. Low level moisture remains with FEW/SCT clouds with bases 2000-5000 ft AGL. Patchy dense fog has developed across the North Bay and will continue through the morning. Low level moisture will persist through the day with stratocu likely becoming a little more widespread under daytime heating. However the TAF sites are expected to remain VFR through the day. Light southeast to east winds are expected through tonight with a brief period of light onshore winds this afternoon. High clouds will increase tonight as a weak system passes to our north.

Vicinity of KSFO . FEW-SCT clouds with bases 3000-5000 ft AGL expected today. VFR anticipated through the day. May see stratocu expand some in coverage this afternoon. Southeast winds around 5 kt this morning through early afternoon becoming variable late this afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR conditions expected today. FEW/SCT clouds expected with bases 3000-5000 ft AGL through the day. South to southeast winds 10-13 kt at KSNS and 5-10 kt at KMRY this morning.

MARINE. as of 02:50 AM PST Friday . High pressure will build over the area today while a low pressure system spins over the Pacific Northwest offshore waters. This will bring light south winds to the northern waters and light north winds to the southern waters through Saturday. Breezy southeast winds will develop Monday as a frontal system approaches. A moderate northwest swell will arrive late Saturday and Sunday while a larger northwest swell arrives the middle of next week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: RWW AVIATION: ST MARINE: ST

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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) 2 mi74 min 53°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi44 min ENE 5.8 G 14 52°F 54°F1026 hPa (+2.3)
FTPC1 - 9414290 - San Francisco, CA 11 mi62 min SE 1.9 G 2.9 44°F 53°F1025.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi57 min Calm 43°F 1026 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi62 min SE 8.9 G 11 46°F 1024.7 hPa
PXSC1 15 mi62 min 47°F 47°F
RCMC1 - 9414863 - Richmond, CA 17 mi62 min NNE 1.9 G 1.9 46°F 53°F1025.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi62 min SE 5.1 G 7
OBXC1 18 mi56 min 46°F 44°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi56 min SSE 4.1 G 8 44°F 1026 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi62 min N 2.9 G 5.1 46°F 1026.2 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi62 min ESE 5.1 G 7 46°F 52°F1025.8 hPa
LNDC1 21 mi56 min Calm G 1.9 44°F 1025.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi62 min 53°F1025.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi62 min SE 2.9 G 5.1 42°F 1025.9 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi56 min ESE 1.9 G 2.9 40°F 52°F1026.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi44 min SE 5.8 G 9.7 51°F 55°F1025.7 hPa (+26.2)45°F
UPBC1 34 mi62 min ENE 4.1 G 5.1
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi62 min ENE 2.9 G 2.9 40°F 51°F1026.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi62 min E 4.1 G 5.1 37°F 49°F1026.1 hPa
46214 - Point Reyes, CA (029) 43 mi44 min 53°F9 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi62 min E 1.9 G 1.9 38°F 1026.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi119 min ENE 1.9
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 47 mi44 min ESE 12 G 16 53°F1025.5 hPa (+1.9)

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA20 mi1.8 hrsN 010.00 miPartly Cloudy41°F37°F89%1025.4 hPa
Half Moon Bay Airport, CA21 mi49 minN 010.00 miFair37°F35°F93%1025.7 hPa
Oakland, Metro Oakland International Airport, CA24 mi51 minESE 410.00 miMostly Cloudy41°F37°F89%1026.1 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrNW15
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NW4S11SE16SE16N9S9SW13W9W8S6SW64CalmCalm3SW3CalmS4S3CalmCalmCalmS3
1 day agoCalmE3E6E5E5NE4E4W11SW8S8S12S6CalmSE6SE11SE9E10E8E9SE14SE17SE13SE18S14
G21
2 days agoNW4W5NW11W8W11W13W14W14W10W7W6W8W5W6CalmSW3CalmSW3SW3CalmCalmCalmS3Calm

Tide / Current Tables for San Francisco Bar, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
San Francisco Bar
Click for Map
Fri -- 12:17 AM PST     Moonrise
Fri -- 04:30 AM PST     5.79 feet High Tide
Fri -- 05:00 AM PST     Last Quarter
Fri -- 07:24 AM PST     Sunrise
Fri -- 10:54 AM PST     1.40 feet Low Tide
Fri -- 12:02 PM PST     Moonset
Fri -- 04:54 PM PST     4.01 feet High Tide
Fri -- 05:17 PM PST     Sunset
Fri -- 10:25 PM PST     1.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.23.24.35.25.75.75.24.33.22.21.61.41.62.12.83.43.943.83.22.51.91.51.6

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Fri -- 12:17 AM PST     Moonrise
Fri -- 02:07 AM PST     1.29 knots Max Flood
Fri -- 05:00 AM PST     Last Quarter
Fri -- 05:43 AM PST     -0.01 knots Slack
Fri -- 07:23 AM PST     Sunrise
Fri -- 08:29 AM PST     -1.45 knots Max Ebb
Fri -- 12:02 PM PST     Moonset
Fri -- 12:08 PM PST     0.00 knots Slack
Fri -- 02:57 PM PST     1.04 knots Max Flood
Fri -- 05:16 PM PST     Sunset
Fri -- 06:20 PM PST     -0.00 knots Slack
Fri -- 08:47 PM PST     -1.08 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.11.31.20.90.4-0.2-1-1.4-1.4-1.1-0.7-0.10.50.910.90.70.2-0.4-1-1.1-0.9-0.5

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 (11,2,3,4)
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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.