Sunday, January19, 2020
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Marine Weather and Tides
San Mateo, 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 7:19AMSunset 5:19PM Sunday January 19, 2020 4:33 AM PST (12:33 UTC) Moonrise 2:31AMMoonset 1:11PM 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 245 Am Pst Sun Jan 19 2020
Today..SE winds up to 10 kt, becoming north this afternoon.
Tonight..N winds around 5 kt.
Martin luther king jr day..NW winds up to 10 kt. A slight chance of rain.
Mon night..S winds 5 to 10 kt. Rain likely.
Tue..S winds 10 to 15 kt. Rain likely.
Tue night..NW winds up to 10 kt. A chance of rain.
Wed..N 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 San Mateo, CA
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location: 37.59, -122.31     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 191144 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 344 AM PST Sun Jan 19 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 3:39 AM PST Sunday . High clouds continue to stream over the area, and temperatures are running a few degrees warmer than yesterday at this time with readings ranging from the upper 30s to upper 40s. Currently, the only observation indicating fog is Byron, in the East Bay, reporting a visibility of less than 1/4 of a mile. Highs today are expected to be a few degrees than yesterday as the upper ridge axis moves over the state. Highs from the mid 50s to mid 60s are expected.

An approaching upper level trough will bring increased cloudiness to the area on Monday leading to rain chances later on Monday. This trough is forecast to bring light rain to most of the forecast area late Monday night through Tuesday. A separate disturbance is forecast to bring moisture into Southern California ahead of the upper trough, and the ECMWF still indicates some precip chances across the southern counties including Monterey and San Benito by Monday afternoon, before the upper trough arrives. Rain chances will then increase from north to south late Monday night and Tuesday morning as the main frontal system arrives. Rainfall is forecast to be mostly light, but may be moderate at times 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.

Mostly dry conditions are expected through the remainder of the week with an upper ridge pushing the moisture to the north. The next rain chances look to be late next weekend when another trough approaches the area.

AVIATION. as of 03:44 AM PST Sunday . For 12z TAFs. VFR conditions through the period aside from possible patchy fog in the North and East Bay Valleys this morning. Satellite shows high clouds streaming overhead at around 20,000 to 25,000 ft AGL along with fog in the Central Valley. Generally light winds this morning with locally breezy conditions down the Salinas Valley. NW to NE winds this afternoon.

Vicinity of KSFO . VFR, generally light offshore winds the majority of the time aside from possible periods of SE winds this morning. Not expecting SE winds to exceed 10 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR through the period. Light SE winds this morning aside from locally breezy winds down the Salinas Valley around 15 kt. NW to NE winds this afternoon.

MARINE. as of 2:45 AM PST Sunday . 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.

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 . Pt Arena to Pigeon Pt 10-60 nm until 3 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 PM



PUBLIC FORECAST: Sims AVIATION: AS 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 8 mi46 min Calm G 0 46°F 52°F1022.6 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi46 min 52°F
LNDC1 14 mi46 min NNE 1.9 G 2.9 49°F 1022.1 hPa
PXSC1 15 mi46 min 51°F 42°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi46 min SW 1.9 G 2.9 49°F 1022.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi46 min ESE 1.9 G 4.1 50°F 1021.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi52 min S 4.1 G 4.1
OBXC1 15 mi46 min 50°F 39°F
FTPC1 - 9414290 - San Francisco, CA 17 mi52 min NNE 12 G 15 53°F 53°F1022.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 22 mi46 min NE 8.9 G 14 54°F 1022.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi35 min N 6 51°F 1023 hPa
46237 - San Francisco Bar, CA (142) 22 mi34 min 53°F9 ft
RCMC1 - 9414863 - Richmond, CA 24 mi46 min 52°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi24 min ENE 18 G 27 53°F 54°F1021.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi52 min ESE 4.1 G 7 47°F 49°F1023 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 32 mi46 min E 12 G 14 47°F 1022.5 hPa
UPBC1 33 mi46 min ESE 8 G 9.9
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi24 min NE 16 G 19 54°F 55°F1020.7 hPa43°F
PCOC1 - 9415144 - Port Chicago, CA 35 mi46 min 49°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi52 min ESE 7 G 8 40°F 1023.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi49 min E 7
PRYC1 - 9415020 - Point Reyes, CA 45 mi52 min 53°F1021.6 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi98 minSE 410.00 miFair44°F37°F79%1022.7 hPa
San Carlos Airport, CA5 mi39 minSW 310.00 miFair41°F35°F81%1022.7 hPa
Oakland, Metro Oakland International Airport, CA9 mi41 minESE 710.00 miMostly Cloudy48°F34°F58%1022.5 hPa
Hayward, Hayward Air Terminal, CA11 mi40 minN 010.00 miFair42°F36°F79%1022.9 hPa
Half Moon Bay Airport, CA11 mi39 minNE 6 G 1410.00 miFair54°F28°F38%1020.7 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrE7E10SE8S5S5E4E6E5SE4E3CalmN3--NE10NE13E11E11E10SE6E4E7SE3SE4SE5
1 day agoCalmCalmCalmS3CalmE6E6NE4NE4N5NE6N4N3N3CalmE12NE10E7CalmS4CalmNE7NE6NE7
2 days agoSE17SE13SE18S14
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NW4S11SE16SE16N9S9SW13W9W8S6SW64CalmCalm3SW3CalmS4S3

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Sun -- 01:01 AM PST     2.10 feet Low Tide
Sun -- 02:30 AM PST     Moonrise
Sun -- 07:21 AM PST     Sunrise
Sun -- 07:25 AM PST     7.93 feet High Tide
Sun -- 01:10 PM PST     Moonset
Sun -- 02:37 PM PST     0.16 feet Low Tide
Sun -- 05:18 PM PST     Sunset
Sun -- 08:59 PM PST     5.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.42.12.43.44.76.17.27.97.875.642.41.10.30.20.81.83.14.35.25.65.34.5

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Sun -- 02:22 AM PST     0.00 knots Slack
Sun -- 02:30 AM PST     Moonrise
Sun -- 05:13 AM PST     1.41 knots Max Flood
Sun -- 07:21 AM PST     Sunrise
Sun -- 08:28 AM PST     -0.00 knots Slack
Sun -- 12:03 PM PST     -1.71 knots Max Ebb
Sun -- 01:10 PM PST     Moonset
Sun -- 03:40 PM PST     0.01 knots Slack
Sun -- 05:18 PM PST     Sunset
Sun -- 06:35 PM PST     1.61 knots Max Flood
Sun -- 09:57 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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-0.9-0.6-0.20.41.11.41.310.4-0.4-1.1-1.6-1.7-1.6-1.2-0.50.31.11.51.61.30.7-0-0.5

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 (7,2,3,4)
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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.