Sunday, January19, 2020
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Marine Weather and Tides
Piedmont, 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 7:20AMSunset 5:18PM Sunday January 19, 2020 2:56 AM PST (10:56 UTC) Moonrise 2:31AMMoonset 1:10PM Illumination 32% Phase: Waning Crescent; Moon at 24 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- 245 Am Pst Sun Jan 19 2020
Today..NE winds 5 to 15 kt.
Tonight..NE winds 5 to 15 kt.
Martin luther king jr day..SE winds up to 10 kt. A slight chance of rain.
Mon night..S winds 10 to 20 kt with gusts up to 25 kt. Rain.
Tue..S winds 10 to 20 kt with gusts up to 30 kt. Rain.
Tue night..W winds 5 to 15 kt.
Wed..NW winds around 5 kt.
Thu..NW winds around 5 kt.
PZZ500 245 Am Pst Sun Jan 19 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to moderate offshore winds will persist across the coastal waters today as high pressure remains over the great basin. Winds will increase and turn southerly on Monday ahead of an approaching frontal system. Moderate northwest swell will continue through the afternoon generating hazardous seas conditions for small vessels. A larger northwest swell will arrive mid week.


7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 190603 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1003 PM PST Sat Jan 18 2020

SYNOPSIS. High pressure building over the West Coast will result in dry and seasonably cool weather conditions through the weekend. Light rain is possible starting Monday, with higher chances of precipitation developing by Tuesday. Mostly dry conditions are then expected for the remainder of next week, with rain possibly returning next weekend.

DISCUSSION. As of 8:50 PM PST Saturday . Although an upper ridge began to build over California today, considerable high cloud cover kept temperatures near or slightly cooler than normal. The upper ridge is forecast to strengthen further tonight and early Sunday, resulting in about 2-3 deg C warming at 850 mb. This should translate into at least slight warming at the surface, although moist westerly flow aloft off the Pacific will maintain high cloud cover and prevent temperatures from warming more than a few degrees in most areas. Surface dewpoints are slightly lower this evening compared to last evening, so it's unlikely there will more than patchy fog development late tonight and early on Sunday.

An upper trough is currently centered over the Eastern Pacific along 145W. Models generally agree that this system will bring light rain to much of our forecast area from late Monday night through Tuesday. At the southern periphery of this trough, and slightly in advance of the trough axis, is a weak disturbance that has tapped into subtropical moisture. This weak feature is generally forecast to dissipate prior to reaching the California coast on Monday. However, the ECMWF has been consistent in brining light precipitation into our area on Monday in advance of the primary upper trough. Our current forecast includes only a slight chance of rain on Monday afternoon and evening which seems appropriate given that only the ECMWF forecasts light precipitation then. Rain chances will then increase from north to south late Monday night and Tuesday morning as the primary frontal system arrives. Rain intensity is forecast to be mostly light with this system, but may be moderate in the North Bay. Most rain should end by late Tuesday, although a few showers may linger into Tuesday night. As much as three-quarters of an inch or rain is forecast in the North Bay through late Tuesday, with generally a third of an inch of less expected elsewhere in our forecast area.

Although the pattern remains progressive through the rest of next week, most of the moisture and energy will be focused to our north and so dry and mild conditions will likely prevail in our area through at least the end of the work week. The exception is in the North Bay on Friday where the 12Z ECMWF brings in some rain. The forecast becomes more uncertain by next weekend when the ECMWF indicates a higher potential for significant precipitation in our area compared to the GFS.

AVIATION. as of 10:03 PM PST Saturday . For 06z TAFs, VFR except for possible patchy fog and/or low clouds late tonight and early Sunday in the North Bay valleys. Winds generally light offshore with high pressure over the Great Basin.

Vicinity of KSFO . VFR, offshore wind for most of the 06z taf.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR, offshore winds.

MARINE. as of 9:59 PM PST Saturday . High pressure over the Great Basin will maintain generally light to moderate offshore winds across the coastal waters through Sunday. Winds will turn southerly and increase by Monday morning ahead of an approaching frontal system. 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. Tngt. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm from 3 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 3 AM



PUBLIC FORECAST: Dykema AVIATION: Canepa MARINE: RGass

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi57 min 48°F 1023.1 hPa (-1.9)
AAMC1 - 9414750 - Alameda, CA 7 mi63 min 49°F 52°F1023.2 hPa
OBXC1 7 mi57 min 49°F 37°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi57 min 48°F 1023.3 hPa (-1.9)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi75 min SE 2.9 G 5.1
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi63 min 53°F 1023.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi63 min 50°F 1022.3 hPa
PXSC1 10 mi63 min 51°F 41°F
RCMC1 - 9414863 - Richmond, CA 11 mi63 min 52°F 53°F1022.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi52 min N 5.1 51°F 1024 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi63 min 52°F 53°F1023.3 hPa
UPBC1 14 mi69 min ESE 13 G 15
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi63 min 49°F 1023.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi57 min 49°F 50°F1024 hPa (-1.6)
PCOC1 - 9415144 - Port Chicago, CA 17 mi57 min 45°F 49°F1023.6 hPa (-1.6)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi57 min 46°F 1024.2 hPa (-1.6)
46237 - San Francisco Bar, CA (142) 22 mi57 min 53°F9 ft
RTYC1 - 9414523 - Redwood City, CA 24 mi57 min 47°F 52°F1023.7 hPa (-1.8)
SFXC1 - San Francisco Bay Reserve, CA 26 mi72 min ENE 4.1
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi37 min E 16 G 21 53°F 54°F1023 hPa
PRYC1 - 9415020 - Point Reyes, CA 41 mi57 min 53°F1022.7 hPa (-1.9)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi37 min NE 9.7 G 14 54°F 55°F1021.9 hPa42°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi64 minE 710.00 miMostly Cloudy48°F34°F58%1023.6 hPa
Concord, Buchanan Field, CA13 mi64 minENE 310.00 miFair45°F36°F71%1022.6 hPa
Hayward, Hayward Air Terminal, CA14 mi63 minN 010.00 miFair45°F35°F68%1024.1 hPa
San Francisco, San Francisco International Airport, CA18 mi61 minESE 310.00 miFair47°F37°F69%1023.2 hPa
San Carlos Airport, CA22 mi62 minN 010.00 miFair45°F35°F71%1023.7 hPa
Livermore, Livermore Municipal Airport, CA24 mi64 minENE 510.00 miFair45°F37°F74%1023.5 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrE4E3E6E7E5E3E6E6E8S6SW5W6NE8NE9NE11E7NE6E4E8SE6E6E7E9E7
1 day agoSE5SE9E5NE4E3E4CalmCalm3W7W4W5W3W8NW6N4E6E7NE5E5E5E7NE5E6
2 days agoS17SE17S23SE24
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Tide / Current Tables for Berkeley, California
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Berkeley
Click for Map
Sun -- 12:32 AM PST     2.13 feet Low Tide
Sun -- 02:31 AM PST     Moonrise
Sun -- 07:06 AM PST     6.49 feet High Tide
Sun -- 07:22 AM PST     Sunrise
Sun -- 01:10 PM PST     Moonset
Sun -- 02:09 PM PST     0.26 feet Low Tide
Sun -- 05:17 PM PST     Sunset
Sun -- 09:01 PM PST     4.25 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.22.22.63.44.45.46.26.56.25.54.22.81.50.60.30.411.82.73.544.24.13.6

Tide / Current Tables for Berkeley Yacht Harbor .9 mi S, San Francisco Bay, California Current
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Berkeley Yacht Harbor .9 mi S
Click for Map
Sun -- 12:27 AM PST     0.00 knots Slack
Sun -- 02:31 AM PST     Moonrise
Sun -- 04:27 AM PST     0.28 knots Max Flood
Sun -- 07:22 AM PST     Sunrise
Sun -- 07:45 AM PST     -0.00 knots Slack
Sun -- 10:41 AM PST     -0.43 knots Max Ebb
Sun -- 01:10 PM PST     Moonset
Sun -- 01:45 PM PST     0.01 knots Slack
Sun -- 05:17 PM PST     Sunset
Sun -- 05:49 PM PST     0.32 knots Max Flood
Sun -- 09:14 PM PST     -0.00 knots Slack
Sun -- 11:15 PM PST     -0.20 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.10.20.20.30.30.20.1-0.1-0.3-0.4-0.4-0.3-0.200.20.30.30.30.30.20-0.1-0.2

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 (5,6,7,8)
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Ground Weather Radar Station Sacramento, 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.