Saturday, January25, 2020
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Marine Weather and Tides
Colma, 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 7:17AMSunset 5:26PM Saturday January 25, 2020 6:17 PM PST (02:17 UTC) Moonrise 8:05AMMoonset 6:20PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 248 Pm Pst Sat Jan 25 2020
Tonight..SW winds 5 to 15 kt. Rain, mainly this evening.
Sun..W winds 5 to 15 kt.
Sun night..NW winds 5 to 15 kt.
Mon..SW winds up to 10 kt.
Mon night..W winds up to 10 kt. A slight chance of showers.
Tue..SW winds up to 10 kt. A chance of showers.
Tue night..NW winds around 5 kt.
Wed..NW winds up to 10 kt.
Thu..NW winds around 5 kt.
PZZ500 248 Pm Pst Sat Jan 25 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will shift to become south to southwest across the waters by this evening ahead of a weak surface frontal boundary before shifting to become northerly by Sunday morning. A long period west to northwest swell will this evening. Additional long period northwest swells will arrive by early next week.


7 Day Forecast for Marine Location Near Colma, CA
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location: 37.68, -122.42     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 260028 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 428 PM PST Sat Jan 25 2020

SYNOPSIS. Temperatures in the 60s today before light rain expected around the Bay Area. Spotty rain is expected to start late this afternoon and continue this evening as a cold front moves through Sunday morning with limited accumulations. High pressure builds for drier conditions Sunday and Monday, though a chance for patchy fog Monday morning. A similar weak system moves through on Tuesday, with chances for light rain in the North Bay. Dry and mild conditions mid-week through next weekend.

DISCUSSION. as of 01:58 PM PST Saturday . Visibilities have improved compared to earlier this morning, but low clouds linger around the Bay Area. Clouds will continue to build ahead of the next boundary moving through. Temperatures are mostly in the 60s, with a few locations in the mid-50s.

A weak upper-level short wave trough passes over Northern California tonight and into Sunday morning. KMUX radar has already picked up on rain over the ocean and moving eastward. The dry air over the land has held up and kept all precipitation out to sea so far. As the first round of rain moves east, forcing will push the precipitation over the North Bay and parts of the Bay Area. A brief break of the rain will bring the second round ahead of the main cold front being driven by the trough. Generally speaking, the bulk of precipitation will be in the North Bay. The highest accumulations will be in the northern higher elevations of Sonoma county seeing a quarter of an inch to a half inch. The remainder of the Bay Area should see less than a quarter of an inch.

As the next ridge builds aloft, higher pressure will increase at the surface helping to dry out the region. Temperatures will cool on Sunday behind the front compared to today, but should still reach the low-60s in many areas. A chance for some patchy fog Sunday night into Monday morning, but Monday looks to be another dry and mild day.

The next upper level trough moves over the Bay Area on Tuesday. Again, with it comes the next boundary that brings rain chances to the Bay Area. But again, it appears to be weak and focused more toward the North Bay with minimal accumulations.

Longer range models are showing fairly dry conditions from the middle of the weak to next weekend as high pressure grows in the southeastern Pacific. It will help moderate moderate temperatures and keep rain chances away. By early next week, a longer wave pattern sets up. While it will keep drier conditions around, it will bring northerly air and therefore much cooler temperatures.

AVIATION. as of 4:28 PM PST Saturday . For 00Z TAFs. A weak cool frontal boundary is moving in from the west. VFR this evening then ceilings and visibilities lowering tonight with light rain showers.

Vicinity of KSFO . Improved visibility with VFR reported and wind west to northwest 5 to 10 knots. Ceiling lowering to MVFR by 02z then IFR by 09z tonight with light rain showers. VFR returns on Sunday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with northwest wind 5 to 10 knots. Lowering ceilings by mid evening to IFR with light wet weather late at night and Sunday morning. VFR returns on Sunday.

MARINE. as of 4:12 PM PST Saturday . Winds will shift to become south to southwest across the waters by this evening ahead of a weak surface frontal boundary before shifting to become northerly by Sunday morning. A long period west to northwest swell will this evening. Additional long period northwest swells will arrive by early next week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: DK AVIATION: Canepa MARINE: Sims

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi48 min WSW 4.1 G 7 60°F 1018 hPa
PXSC1 9 mi48 min 60°F 58°F
AAMC1 - 9414750 - Alameda, CA 9 mi48 min 53°F
FTPC1 - 9414290 - San Francisco, CA 9 mi48 min WSW 4.1 G 7 55°F 54°F1019.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi48 min WNW 2.9 G 4.1 55°F 1019 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi54 min Calm G 1
OBXC1 10 mi48 min 56°F 56°F
LNDC1 11 mi48 min NW 1 G 1 59°F 1018.8 hPa
46237 - San Francisco Bar, CA (142) 14 mi48 min 53°F8 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi31 min SSE 5.1 55°F 1019 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi48 min SW 8 G 9.9 58°F 1019.2 hPa
RTYC1 - 9414523 - Redwood City, CA 16 mi48 min WNW 8 G 8.9 60°F 55°F1019.2 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi48 min 53°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi28 min SSE 3.9 G 5.8 55°F 54°F9 ft1019.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi48 min NE 1.9 G 2.9 56°F 1018.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi48 min Calm G 0 56°F 52°F1018.5 hPa
UPBC1 29 mi48 min Calm G 1
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi28 min SE 3.9 G 7.8 55°F 55°F11 ft1019.7 hPa55°F
PCOC1 - 9415144 - Port Chicago, CA 33 mi48 min E 2.9 G 4.1 57°F 51°F1018.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 37 mi48 min 54°F1018.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi48 min SSE 4.1 G 5.1 56°F 1018.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi93 min SE 2.9

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi82 minWNW 510.00 miMostly Cloudy61°F54°F78%1018.5 hPa
Oakland, Metro Oakland International Airport, CA11 mi25 minNW 310.00 miMostly Cloudy60°F54°F80%1018.8 hPa
Half Moon Bay Airport, CA12 mi23 minS 32.50 miFog/Mist55°F53°F94%1019.6 hPa
San Carlos Airport, CA14 mi31 minW 810.00 miMostly Cloudy61°F55°F83%1019 hPa
Hayward, Hayward Air Terminal, CA16 mi24 minNNW 310.00 miA Few Clouds58°F53°F84%1019.6 hPa
Palo Alto Airport, CA21 mi31 minN 510.00 miOvercast55°F53°F94%1019 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW11W9W8W7W6NW8NW6N3SE3SE4SE4CalmW5NE5SE6E4E3NE5NE6NE3CalmW7NW5W9
1 day agoN3CalmCalmSE4SE3CalmW9W9W6CalmS3CalmNW3CalmE7E5CalmNE5NE5NE3W11W13W12W12
2 days agoW6W4N3CalmCalmCalmCalmCalmCalmCalmCalmCalmSE3SE4E3SE3E4NE3NE3CalmNE3N4N4S3

Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
Click for Map
Sat -- 01:22 AM PST     6.27 feet High Tide
Sat -- 06:16 AM PST     2.85 feet Low Tide
Sat -- 07:18 AM PST     Sunrise
Sat -- 08:05 AM PST     Moonrise
Sat -- 11:55 AM PST     7.45 feet High Tide
Sat -- 05:25 PM PST     Sunset
Sat -- 06:21 PM PST     Moonset
Sat -- 06:58 PM PST     -0.59 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.66.26.15.44.33.42.933.84.96.17.17.475.94.32.40.8-0.3-0.6-0.20.82.13.6

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Sat -- 01:19 AM PST     -0.01 knots Slack
Sat -- 03:49 AM PST     -0.65 knots Max Ebb
Sat -- 06:30 AM PST     0.00 knots Slack
Sat -- 07:18 AM PST     Sunrise
Sat -- 08:04 AM PST     Moonrise
Sat -- 09:28 AM PST     0.80 knots Max Flood
Sat -- 12:20 PM PST     -0.01 knots Slack
Sat -- 03:52 PM PST     -1.43 knots Max Ebb
Sat -- 05:25 PM PST     Sunset
Sat -- 06:20 PM PST     Moonset
Sat -- 07:22 PM PST     0.01 knots Slack
Sat -- 10:36 PM PST     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.2-0.3-0.6-0.6-0.5-0.20.20.60.80.80.60.2-0.4-0.9-1.3-1.4-1.2-0.8-0.30.40.81.11.1

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 (21,6,7,8)
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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.