Monday, January20, 2020
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Marine Weather and Tides
Menlo Park, 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 5:20PM Monday January 20, 2020 3:38 AM PST (11:38 UTC) Moonrise 3:36AMMoonset 1:51PM Illumination 23% Phase: Waning Crescent; Moon at 25 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 205 Am Pst Mon Jan 20 2020
Today..SE winds up to 10 kt, becoming sw this afternoon.
Tonight..S winds 5 to 15 kt. Rain likely.
Tue..S winds 10 to 20 kt with gusts up to 25 kt. Rain.
Tue night..NW winds up to 10 kt. A chance of rain.
Wed..NE winds up to 10 kt.
Wed night..NE winds up to 10 kt.
Thu..N winds around 5 kt.
Fri..SW winds around 5 kt. A chance of rain.
PZZ500 205 Am Pst Mon Jan 20 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will continue to shift southerly into this morning ahead of an approaching frontal system. Southerly winds will then increase across the waters by this evening before the system moves through the waters on Tuesday. Moderate northwest swell will persist most of today before a longer period northwest swell arrives this afternoon and wave heights build through mid week. This will generate hazardous seas conditions for smaller vessels. A second long period northwest swell will then arrive late week.


7 Day Forecast for Marine Location Near Menlo Park, CA
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location: 37.52, -122.16     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 201032 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 232 AM PST Mon Jan 20 2020

SYNOPSIS. Mostly cloudy and seasonably cool conditions will persist over the region today. There is a slight chance of sprinkles or isolated light rain, but most areas should remain dry. Rain chances increase region-wide late tonight into Tuesday as a weak frontal system moves across northern California. Mostly dry conditions are then expected for the remainder of the week, with rain likely returning next weekend.

DISCUSSION. As of 2:30 AM PST Monday . There are no significant weather concerns in the short term. Widespread high clouds continue to stream off the Pacific and across California. These clouds are helping to limit fog formation overnight, and only patchy light fog is currently being observed in the North and East Bay Valleys. Deeper moisture and a weak upper level disturbance well to our southwest are forecast to move inland to the south of our area today. Radar currently shows weak returns offshore, but only at elevations of 12000 feet and above. Thus, we may see some virga or a few sprinkles today, but measurable precipitation is highly unlikely. Cloud cover will keep temperatures on the cool side of normal today, especially across the North and East Bay. Temperatures in these areas have been cooler than the NBM and most other model guidance over the past few days and will likely be so again today. Therefore, North and East Bay temps were adjusted below NBM values today.

Satellite currently shows a weather system offshore from the Pacific Northwest and northern California, along 135W. This system is forecast to track east today and tonight and begin spreading light rain into the North Bay tonight as warm advection develops. Rain will increase in the North Bay, and also begin spreading south and east of the Golden Gate, on Tuesday morning as the cold front approaches. Because the upper trough is forecast to track almost due east with very little southward movement, rain rates and amounts are expected to decrease quite a bit as the surface front moves south and east of San Francisco on Tuesday afternoon and evening. Showers may linger over the southern portion of our area through Tuesday night, but dry weather should return to all areas by Wednesday. Rainfall totals with the Tuesday system are currently forecast to range from a quarter to a half inch in the North Bay, except locally up to an inch in northwest Sonoma County. Elsewhere, rain totals are expected to be a quarter inch or less, except perhaps up to a half inch in the Santa Cruz Mountains. This system will not be cold like recent systems that came in from the northwest and snow levels are forecast to remain mostly above 6000 feet when precipitation is falling. Winds are not expected to have a significant impact with this system, although southerly wind gusts up to 30 mph are possible near the coast and locally in the hills on Tuesday.

Generally dry conditions are forecast for the remainder of the work week as the storm track remains to our north, but the Northern fringes of our area may see light rain at times. A relatively mild airmass will persist over our area and temperatures are forecast to be slightly warmer than normal in most areas during the second half of the week.

The longer range models are coming into better agreement for next weekend, and it looks increasingly likely that widespread rain will occur, with highest rain chances late Saturday night into Sunday. Based on the latest deterministic models, as well as the ensemble means, the weekend system looks somewhat stronger and wetter than the Tuesday system, but probably not strong/wet enough to produce significant weather impacts.

AVIATION. as of 10:49 PM PST Sunday . For 06z TAFs. Extensive cloud cover over the eastern Pacific is also covering CA/NV to British Columbia. Thick cloud cover is obscuring the areal coverage of low clouds over the Central Valley, part of which is entering the East Bay, Byron Airport reports 4 miles visibility in mist and overcast 900 feet. All other airports report VFR except KHAF reports MVFR 3 miles visibility in haze.

The synoptic pattern favors a continuation of mainly weak surface based offshore pressure gradient and winds, combined with a lack of ocean/land temperature contrasts negates a maritime influence (sea breezes) through tonight and Monday morning. However, by Monday afternoon light onshore winds could develop locally on the coast. VFR is forecast, lowest confidence is in areal coverage of fog and/or low clouds in the East Bay valleys tonight and Monday morning.

Vicinity of KSFO . VFR. Light N-NE wind tonight becoming SW Monday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Light E-SE winds except up to 10 knots in the Salinas Valley, winds onshore 5 to 10 knots Monday afternoon.

MARINE. As of 2:05 AM PST Monday . Winds will continue to shift southerly into this morning ahead of an approaching frontal system. Southerly winds will then increase across the waters by this evening before the system moves through the waters on Tuesday. Moderate northwest swell will persist most of today before a longer period northwest swell arrives this afternoon and wave heights build through mid week. This will generate hazardous seas conditions for smaller vessels. A second long period northwest swell will then arrive late week.

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



PUBLIC FORECAST: Dykema AVIATION: Canepa MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi50 min S 1 G 1.9 1017.4 hPa
AAMC1 - 9414750 - Alameda, CA 19 mi50 min 52°F
LNDC1 20 mi50 min ESE 4.1 G 5.1 1016.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi56 min NNW 4.1 G 5.1
OBXC1 22 mi50 min 51°F 43°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 22 mi50 min NNW 5.1 G 7 1016.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi50 min NW 8.9 G 12 49°F 1015.8 hPa
PXSC1 23 mi50 min 50°F 46°F
FTPC1 - 9414290 - San Francisco, CA 26 mi56 min N 16 G 19 49°F 52°F1016.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi50 min NNW 8.9 G 11 49°F 1017 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 30 mi57 min WNW 12 47°F 1017 hPa
46237 - San Francisco Bar, CA (142) 31 mi38 min 53°F7 ft
RCMC1 - 9414863 - Richmond, CA 31 mi50 min 53°F
UPBC1 36 mi50 min ENE 7 G 11
MZXC1 - 9415102 - Martinez-Amorco CA 36 mi56 min NE 8 G 8.9 44°F 50°F1017.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi50 min E 13 G 15 45°F 1017 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi50 min NE 11 G 12 49°F1017.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi56 min ESE 6 G 8 44°F 1017.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 39 mi28 min E 14 G 18 52°F 54°F1016.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi28 min E 5.8 G 9.7 54°F 55°F1016.4 hPa49°F
SFXC1 - San Francisco Bay Reserve, CA 48 mi113 min E 4.1

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA5 mi43 minN 010.00 miFair46°F41°F82%1017.3 hPa
Hayward, Hayward Air Terminal, CA10 mi44 minN 010.00 miFair46°F39°F79%1017.8 hPa
Oakland, Metro Oakland International Airport, CA13 mi45 minN 010.00 miOvercast47°F42°F83%1017.3 hPa
San Francisco, San Francisco International Airport, CA13 mi42 minSE 510.00 miOvercast49°F41°F74%1016.8 hPa
San Jose, San Jose International Airport, CA16 mi45 minWSW 310.00 miFair46°F42°F86%1016.9 hPa
Half Moon Bay Airport, CA18 mi43 minNE 36.00 miMostly Cloudy with Haze48°F42°F82%1016.6 hPa
Livermore, Livermore Municipal Airport, CA22 mi45 minN 04.00 miFog/Mist41°F39°F93%1017.1 hPa

Link to 5 minute data for KPAO

Wind History from PAO (wind in knots)
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Last 24hr------------------4CalmCalm3--3--CalmNE6NE7N6SW3CalmNE6Calm
1 day ago------------------Calm4------3N4N4CalmNW4N6NE4--NE10NE11
2 days ago------------------CalmCalmCalm43Calm4N7N6NW4--CalmCalmCalm--

Tide / Current Tables for Redwood Creek, C.M. No.8, San Francisco Bay, California
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Redwood Creek
Click for Map
Mon -- 02:27 AM PST     2.66 feet Low Tide
Mon -- 03:36 AM PST     Moonrise
Mon -- 07:20 AM PST     Sunrise
Mon -- 08:28 AM PST     8.70 feet High Tide
Mon -- 01:50 PM PST     Moonset
Mon -- 03:52 PM PST     -0.32 feet Low Tide
Mon -- 05:19 PM PST     Sunset
Mon -- 10:18 PM PST     6.47 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.23.32.72.83.656.57.88.68.67.86.34.52.81.20-0.30.21.32.94.55.86.46.3

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Mon -- 12:34 AM PST     -0.56 knots Max Ebb
Mon -- 03:02 AM PST     0.00 knots Slack
Mon -- 03:36 AM PST     Moonrise
Mon -- 06:23 AM PST     1.41 knots Max Flood
Mon -- 07:20 AM PST     Sunrise
Mon -- 09:45 AM PST     -0.00 knots Slack
Mon -- 12:54 PM PST     -1.61 knots Max Ebb
Mon -- 01:50 PM PST     Moonset
Mon -- 04:25 PM PST     0.00 knots Slack
Mon -- 05:19 PM PST     Sunset
Mon -- 07:55 PM PST     1.71 knots Max Flood
Mon -- 11:37 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.5-0.5-0.4-00.51.11.41.41.10.6-0.2-1-1.5-1.6-1.5-1.1-0.40.51.21.61.71.51.10.4

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 (6,6,7,8)
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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.