Wednesday, January22, 2020
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Marine Weather and Tides
Millbrae, 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 7:18AMSunset 5:23PM Wednesday January 22, 2020 7:03 AM PST (15:03 UTC) Moonrise 5:42AMMoonset 3:28PM Illumination 7% Phase: Waning Crescent; Moon at 27 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- 223 Am Pst Wed Jan 22 2020
.small craft advisory in effect through this afternoon...
Today..NE winds up to 10 kt, becoming nw this afternoon. Wind waves 1 to 2 ft. W swell 8 to 10 ft at 14 seconds.
Tonight..N winds up to 10 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 13 seconds.
Thu..NW winds up to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft at 12 seconds.
Thu night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft at 13 seconds and W 2 to 3 ft at 23 seconds.
Fri..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft at 13 seconds and W 4 to 5 ft at 21 seconds.
Fri night..W winds around 5 kt. Wind waves 1 ft. W swell 8 to 10 ft at 18 seconds and nw 2 to 4 ft at 19 seconds. Patchy fog. A chance of rain.
Sat..S winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft. Rain likely.
Sun..W winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 9 to 11 ft. Rain likely.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 8 to 10 ft with a dominant period of 14 seconds. Across the bar...seas 9 to 12 ft with a dominant period of 14 seconds. Maximum ebb current of 3.4 kt at 02:13 pm Wednesday and 1.7 kt at 03:07 am Thursday.
PZZ500 223 Am Pst Wed Jan 22 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light variable winds across most of the waters through midday, with locally breezy south/east winds along the southern coast. Later this afternoon and evening, winds shift to the north and strengthen across most of the waters through tomorrow. A wnw swell will peak today generating hazardous seas conditions for smaller vessels. Another longer period wnw swell will then arrive later this week.


7 Day Forecast for Marine Location Near Millbrae, CA
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location: 37.58, -122.39     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 221159 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 359 AM PST Wed Jan 22 2020

SYNOPSIS. A few lingering showers and patchy fog will be possible early Wednesday. Otherwise, mostly dry and warmer conditions will return through Friday. A storm system moving into Northern California this weekend bringing another chance for rain.

DISCUSSION. as of 02:42 AM PST Wednesday . A nearly stationary frontal boundary remains draped over the Bay Area resulting in lingering showers early Wednesday morning. Moist flow across the terrain is just enough to generate light precip. KMUX radar imagery shows the light rain has been most prevalent over the Santa Cruz Mountains and the East Bay Hills. Rainfall amounts over the last six hours have generally been a tenth or two, but a few jackpots up to one half inch in the Santa Cruz Mountains. Shower activity will continue to diminish through the early morning hours with little to no impacts except for some damp roads. One weather impact the could affect the morning commute will be fog. Given the ample low level moisture automated sites around the region have been reporting some fog with dense fog being reported at KSTS. Therefore, forecast through the morning hours will include fog. Besides lingering showers and fog this morning, the bigger story will be a warming and drying trend developing this afternoon through Friday. Highs today will approach or hit the mid 60s across the interior. Temperatures will increase further on Thursday and Friday with more widespread 60s and a few interior locations in Monterey/San Benito may even approach 70 degrees - about five degrees above normal.

No change in the 00Z model suite, rain chances look to return this weekend as the ridge flattens with another storm system moving into the British Columbia. The next storm system will drag another frontal boundary through Northern California. Light rain will return to the Bay Area Friday night over the North Bay and then slowly move southward over the weekend. Definitely looks wetter than the light precip from Tuesday, but as noted before not a major soaker and heaviest rain will be north. Rain chances linger into early next week as the tail end of additional weak systems pass to the north. High pressure rebuilds the middle of next week taking the storm track farther north.

Longer range outlook is definitely trending drier through the end of next week and beyond. CPC outlooks continue the warming and drying trend into early February.

AVIATION. as of 3:55 AM PST Wednesday . For 12z TAFs. Weak boundary remains in place over the region while a high pressure ridge is building in shortly behind it. For this morning, slight chance VCSH/-SHRA for KMRY KSNS KWVI KSJC KSQL KRHV KCVH ahead of the boundary, with LIFR to MVFR cigs regionwide. Patchy dense fog in the North Bay (KSTS) in the wake of the front. Expect to see improvements to VFR mid to late morning at all taf sites. Winds generally light and terrain driven today.

Vicinity of KSFO . BKN-OVC cigs 1200-3000 ft this morning thru 18-19Z with weak stationary front over the peninsula. Borderline MVFR/VFR cigs 19-22Z (ie SCT/BKN 2500-4000 ft). Winds generally light, 8kt or less, backing from offshore to become westerly by 21-22z. Improving conditions later this afternoon and tonight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VCSH/-SHRA with IFR cigs into sunrise with reductions in visibility to 2-4sm as well. Winds generally light and terrain driven, up to 8-10kt at KSNS around sunrise. VFR at or around 19Z with gradually improving conditions through the afternoon. KSNS weather station is currently not reporting but you may call the weather stations for the latest observations. See KMRY/KCVH for nearby obs.

MARINE. as of 03:48 AM PST Wednesday . Light variable winds across most of the waters through midday, with locally breezy south/east winds along the southern coast. Later this afternoon and evening, winds shift to the north and strengthen across most of the waters through tomorrow. A WNW swell will peak today generating hazardous seas conditions for smaller vessels. Another longer period WNW swell will then arrive later this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pt Reyes 0-10 nm until 3 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM SCA . Pt Arena to Pigeon Pt 10-60 nm until 3 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: MM AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi45 min 53°F 52°F1023.8 hPa
AAMC1 - 9414750 - Alameda, CA 14 mi45 min 52°F
PXSC1 15 mi45 min 53°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi45 min 52°F 1022.5 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi45 min 52°F 1023.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi63 min WSW 1 G 1.9
OBXC1 16 mi45 min 52°F 52°F
LNDC1 16 mi45 min 53°F 1023.4 hPa
FTPC1 - 9414290 - San Francisco, CA 16 mi51 min 52°F 53°F1023.5 hPa
46237 - San Francisco Bar, CA (142) 19 mi63 min 53°F10 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi28 min N 2.9 50°F 1024 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi45 min 52°F 1023.8 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi45 min 52°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi23 min NNE 5.8 G 7.8 52°F 54°F1024.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 30 mi23 min NE 5.8 G 9.7 52°F 53°F1024 hPa51°F
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi45 min 50°F 50°F1023.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi45 min 49°F 1023.2 hPa
UPBC1 35 mi63 min NW 2.9 G 5.1
PCOC1 - 9415144 - Port Chicago, CA 38 mi45 min 50°F 49°F1023.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi45 min 51°F 1023.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 42 mi45 min 53°F1023.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 47 mi78 min SSE 1.9

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi67 minN 07.00 miMostly Cloudy53°F50°F89%1023.2 hPa
San Carlos Airport, CA8 mi68 minN 09.00 miOvercast54°F53°F100%1023.4 hPa
Half Moon Bay Airport, CA8 mi63 minN 04.00 miFog/Mist52°F50°F94%1023.4 hPa
Oakland, Metro Oakland International Airport, CA12 mi70 minN 07.00 miOvercast54°F52°F93%1023.4 hPa
Hayward, Hayward Air Terminal, CA15 mi69 minN 05.00 miFog/Mist53°F51°F93%1024 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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1 day agoSE4S3SE5SE3NE4E5E5E4E3CalmE3S7S5S7S6S8S7S9SE9SE7SE8SE9SE6SE6
2 days agoSE6SE9SE8SE6SE6SE7SE5SE6E4N4NE4CalmE5E5E7E6CalmSE5CalmSE3SE5CalmS5Calm

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Wed -- 04:01 AM PST     2.88 feet Low Tide
Wed -- 05:41 AM PST     Moonrise
Wed -- 07:20 AM PST     Sunrise
Wed -- 09:54 AM PST     8.11 feet High Tide
Wed -- 03:27 PM PST     Moonset
Wed -- 05:13 PM PST     -0.99 feet Low Tide
Wed -- 05:21 PM PST     Sunset
Wed -- 11:53 PM PST     6.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.95.14.13.22.93.24.25.56.87.88.17.66.44.62.81-0.4-1-0.70.21.73.456.1

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Wed -- 02:08 AM PST     -0.79 knots Max Ebb
Wed -- 04:32 AM PST     0.00 knots Slack
Wed -- 05:41 AM PST     Moonrise
Wed -- 07:20 AM PST     Sunrise
Wed -- 07:31 AM PST     0.82 knots Max Flood
Wed -- 10:19 AM PST     -0.00 knots Slack
Wed -- 02:11 PM PST     -1.98 knots Max Ebb
Wed -- 03:27 PM PST     Moonset
Wed -- 05:21 PM PST     Sunset
Wed -- 05:35 PM PST     0.01 knots Slack
Wed -- 08:52 PM PST     1.18 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.7-0.8-0.7-0.30.20.60.80.80.60.2-0.5-1.2-1.8-2-1.9-1.4-0.60.30.81.11.210.6

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 (10,2,3,4)
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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.