Thursday, April2, 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 6:52AMSunset 7:34PM Wednesday April 1, 2020 11:46 PM PDT (06:46 UTC) Moonrise 11:25AMMoonset 1:40AM Illumination 68% Phase: Waxing Gibbous; Moon at 9 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- 832 Pm Pdt Wed Apr 1 2020
.gale warning in effect until 3 am pdt Thursday...
Tonight..NW winds 20 to 30 kt. Gusts up to 40 kt this evening. Wind waves 9 to 10 ft, decreasing to 6 to 7 ft after midnight. NW swell 3 to 5 ft at 11 seconds.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. Mixed swell nw 3 to 4 ft at 11 seconds and sw around 2 ft at 18 seconds.
Thu night..NW winds 20 to 25 kt with gusts up to 35 kt. Wind waves 7 to 8 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 16 seconds.
Fri..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 8 to 9 ft. Mixed swell nw around 3 ft at 11 seconds and S around 2 ft at 16 seconds.
Fri night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 5 to 6 ft. Mixed swell nw around 3 ft at 10 seconds and sw around 2 ft at 15 seconds.
Sat..SW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 15 seconds. Rain likely.
Sat night..SW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 10 seconds and S around 2 ft at 14 seconds. Rain likely.
Sun..W winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft and S around 2 ft. Rain likely.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft and S around 2 ft. A chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 6 to 9 ft with a dominant period of 8 seconds. Across the bar...seas 6 to 9 ft with a dominant period of 8 seconds. Maximum ebb current of 1.0 kt at 12:43 am Thursday and 2.2 kt at 11:49 am Thursday.
PZZ500 832 Pm Pdt Wed Apr 1 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North-northwesterly winds remain strong with gale force gusts. These strong winds will prevail over the waters through tonight generating fresh and steep wind generated waves. Winds will back off only a slight amount Thursday, before strengthening again Thursday night. The southwesterly swell will continue to be light and persist through the week. Winds will gradually ease through the end of the week and into the weekend.


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 020539 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1039 PM PDT Wed Apr 1 2020

SYNOPSIS. Clear and cool weather overnight into Thursday morning. Continued sunny and seasonably mild Thursday afternoon into Friday but one more cold morning Friday. A cold front arrives Saturday with light rain in the morning for the North Bay spreading over the Bay Area by afternoon. A second, stronger storm will drop down on Sunday with more rain, isolated thunderstorms and lowering snow levels to around 3000 feet. Showers linger into Monday and possibly early next week for the Central Coast as the low slowly departs.

DISCUSSION. as of 08:43 PM PDT Wednesday . As the sun set over the Bay Area most of the afternoon/evening cumulus clouds quickly dissipated. Some patchy clouds do lingering as seen by satellite imagery, webcams, and automated sensors (few-sct). Do expect these clouds to thin out even more overnight with mostly clear skies by morning. Near term weather impact concerns continue to be focused on two things: wind and overnight temperatures. Latest pressure gradient from ACV-SFO is almost 7mb, which is pretty decent. The strong gradient has resulted in gusty winds over the waters, coastline and Bay Area Hills. The latest 00z models continue to advertise a slight uptick in wind speed overnight, especially the inland higher terrain. North Bay Mts and East Bay Hills veering more to the northeast by Thursday morning. These winds are forecast to be strongest over the North Bay peaks (Mt St Helena) with some gusts over 50 mph. The valleys will be much weaker, but still hold onto some wind. That right there plays into weather impact number two - chilly overnight temperatures. Current forecast has temperatures dropping overnight into the 40s coast and SF Bay Shoreline. Inland valleys will be colder and in the 30s, possibly lower 30s. The weak valley wind will help to keep temperatures from dropping to Frost Advisory criteria. That being said, if winds do go calm in the valleys predicted dew point values would support colder overnight temperatures. Night shift will have to keep an eye on this, but for now will not update the forecast.

Pleasant afternoon weather is expected on Thursday and Friday, before wet weather returns over the weekend.

PREV DISCUSSION. as of 2:17 PM PDT Wednesday .

Main forecast item of focus then turns to wet weather this weekend. Models have been consistent in bringing rain into the North Bay by Saturday morning then spreading over the Bay Area Saturday afternoon and evening. Rain band will fall apart as it reaches the Central Coast with little or no rainfall south of Salinas. The Saturday system looks light/moderate strength with rain amounts 0.25-0.50 for the Bay Area.

A second stronger system will drop down the coast on Sunday with another round of rain followed by thunderstorms with small hail. Snow levels will lower to around 3000 feet in the North Bay and 3500 feet Bay Area/Central Coast. Daytime highs this weekend will be cold due to precip/cloud cover with highs struggling to reach 60 degrees. Storm totals (including Saturday precip) by late Sunday night/early Monday morning of 0.50-1.00 on average with 1-1.5 inches for the hills.

Showers will linger on Monday as the low slowly wobbles over Southern California. The last two runs of the ECMWF keep the low over SoCal through at least Weds which would keep shower chances going for the Central Coast but the Bay Area should be dry Tue/Weds with drier northeast flow rotating around the low. High pressure to finally build in by mid to late week as the low ejects.

AVIATION. as of 10:38 PM PDT Wednesday . for 06Z TAFs. Mostly VFR conditions with a small patch of clouds hanging around the Southern Monterey Bay. Winds have reduced compared to earlier this afternoon/evening and should continue to ease slightly through the evening. Low confidence in a few lower clouds around isolated terminals overnight, otherwise VFR through Thursday. Winds will remain onshore and once again strengthen Thursday afternoon.

Vicinity of KSFO . VFR. Skies are clear and breezy onshore winds continue to decrease slowly. Slight chance for a few lower clouds overnight, but there is low confidence in development. Cloud cigs are forecast to lift by the late morning as winds become strengthen once again on Thursday. VFR forecast through the day while winds will be breezy and remain onshore in the afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . A patch of clouds has developed on the southern part of the bay providing MVFR conditions as isolated areas, VFR elsewhere. Wind remain breezy in the Salinas Valley at this hour, but will continue to ease through the evening. A few mid level clouds could develop, but VFR conditions are forecast all day Thursday. Winds will be onshore once again and become breezier in the afternoon, before easing Thursday evening.

MARINE. as of 8:32 PM PDT Wednesday . North-northwesterly winds remain strong with gale force gusts. These strong winds will prevail over the waters through tonight generating fresh and steep wind generated waves. Winds will back off only a slight amount Thursday, before strengthening again Thursday night. The southwesterly swell will continue to be light and persist through the week. Winds will gradually ease through the end of the week and into the weekend.

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



PUBLIC FORECAST: MM/RWW AVIATION: DK MARINE: DK

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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 mi46 min 54°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi26 min NW 23 G 29 52°F 54°F1016.7 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi52 min SSW 4.1 G 5.1 50°F 59°F1016.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi42 min WNW 7 52°F 1016 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi52 min NNW 11 G 14 54°F 1015 hPa
PXSC1 15 mi52 min 56°F 45°F
RCMC1 - 9414863 - Richmond, CA 17 mi52 min NW 12 G 15 52°F 57°F1015.8 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi52 min NNW 8 G 9.9 54°F 1016.1 hPa
OBXC1 18 mi52 min 54°F 41°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi52 min NNW 11 G 14
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi52 min NW 4.1 G 7 54°F 1016.5 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi52 min WNW 2.9 G 6 54°F 60°F1016 hPa
LNDC1 21 mi52 min NNW 8 G 11 54°F 1015.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi52 min NW 15 G 17 54°F 1015.8 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi52 min W 4.1 G 7 51°F 61°F1016.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi26 min NNW 25 G 31 53°F 56°F1017.2 hPa46°F
UPBC1 34 mi52 min WNW 12 G 15
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi52 min W 12 G 14 53°F 58°F1015.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi52 min W 8.9 G 13 54°F 58°F1015.4 hPa
46214 - Point Reyes, CA (029) 43 mi46 min 54°F14 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi52 min W 8 G 11 54°F 1015.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi61 min NW 2.9
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 47 mi26 min NNW 25 G 31 52°F1017.4 hPa

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 mi50 minWSW 910.00 miFair52°F42°F69%1016.1 hPa
Half Moon Bay Airport, CA21 mi51 minNNW 12 G 217.00 miA Few Clouds50°F42°F76%1016.6 hPa
Oakland, Metro Oakland International Airport, CA24 mi53 minNNW 510.00 miFair54°F41°F62%1016.1 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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1 day agoW3SW4SW3CalmNW3W5NW6CalmS4CalmW3E3E5NW12W11W16W13
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2 days agoW8SW5W5W7SW3SW3CalmCalmSW3SE4E4NE5NE6E6NE3W10W12W14W14W13W11W6SW4W4

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Thu -- 12:25 AM PDT     3.22 feet Low Tide
Thu -- 03:33 AM PDT     Moonset
Thu -- 06:02 AM PDT     4.93 feet High Tide
Thu -- 06:53 AM PDT     Sunrise
Thu -- 01:15 PM PDT     -0.03 feet Low Tide
Thu -- 01:26 PM PDT     Moonrise
Thu -- 07:35 PM PDT     Sunset
Thu -- 08:51 PM PDT     4.26 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.23.33.53.94.44.84.94.84.23.22.11.10.3-00.10.51.222.93.64.14.34.13.7

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Thu -- 01:57 AM PDT     0.00 knots Slack
Thu -- 03:32 AM PDT     Moonset
Thu -- 04:36 AM PDT     0.62 knots Max Flood
Thu -- 06:53 AM PDT     Sunrise
Thu -- 07:37 AM PDT     -0.00 knots Slack
Thu -- 10:58 AM PDT     -1.50 knots Max Ebb
Thu -- 01:26 PM PDT     Moonrise
Thu -- 02:46 PM PDT     0.00 knots Slack
Thu -- 05:59 PM PDT     1.23 knots Max Flood
Thu -- 07:34 PM PDT     Sunset
Thu -- 09:43 PM PDT     -0.01 knots Slack
Thu -- 11:50 PM PDT     -0.78 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.300.30.60.60.50.2-0.2-0.8-1.3-1.5-1.3-1-0.50.10.71.11.21.10.90.4-0.2-0.7

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 (2,6,7,8)
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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.