Monday, March30, 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 6:56AMSunset 7:31PM Sunday March 29, 2020 9:17 PM PDT (04:17 UTC) Moonrise 9:02AMMoonset 11:43PM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 905 Pm Pdt Sun Mar 29 2020
Tonight..SW winds 5 to 10 kt.
Mon..SW winds 5 to 10 kt. A slight chance of rain.
Mon night..SW winds 5 to 10 kt.
Tue..W winds 5 to 10 kt.
Tue night..W winds 5 to 10 kt.
Wed..NW winds 5 to 10 kt.
Wed night..NW winds 5 to 10 kt.
Thu..NW winds 5 to 10 kt.
Fri..W winds 5 to 15 kt.
PZZ500 905 Pm Pdt Sun Mar 29 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Low preesure off the pacific northwest and high pressure off the central and southern california coast will result in stronger winds over the southern waters off big sur. As the high builds norhward by midweek northwest winds will increase. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.


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 300408 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 908 PM PDT Sun Mar 29 2020

SYNOPSIS. Fog is possible in the valleys overnight, especially in the North Bay. A weak weather system may bring light rain to the North Bay on Monday while areas to the south remain dry. Dry conditions, along with seasonable temperatures, are forecast for most of the remainder of the week, although there are some signs of rain returning by late Friday or Friday night.

DISCUSSION. As of 9:05 PM PDT Sunday . Shower activity quickly dissipated after sunset this evening. Now that the upper trough responsible for today's showers has moved well to our east, any additional shower activity overnight is highly unlikely. However, a few sprinkles overnight can't be ruled out given that the latest NAM and HRRR both show isolated light precip persisting. Primary concern overnight is for late night fog development where clouds clear. Fog late tonight and Monday morning is most likely in the North Bay Valleys.

Evening IR satellite imagery shows the next system moving inland to our north across the Pacific Northwest. Latest short-term models indicate that northern Sonoma County and northern Napa County could see some light rain from this system on Monday. Elsewhere, Monday is expected to be a dry day under partly cloudy skies with seasonable temperatures.

Dry weather should continue region-wide for most of the remainder of the work week. The warming trend that was expected for much of the week ahead now looks as though it may not materialize. Previous model runs had forecast a building upper ridge near the West Coast through much of the week. Latest models now maintain a cyclonic flow aloft over California as a longwave trough persists just to our east. Thus, only slightly warmer temperatures are anticipated from Tuesday through Friday, with high temperatures mostly remaining in the 60s. In addition, forecast confidence in dry weather through the week has diminished as the latest deterministic model runs of the GFS and ECMWF indicate rain potential across at least the northern portion of our area late Friday or Friday night.

Longer range models indicate mostly dry conditions next weekend, but then the potential for development of a wet pattern during the following week.

AVIATION. as of 4:30 PM PDT Sunday . Showers decreasing this afternoon as upper level low moves south of the district. However abundant low-level moisture will allow MVFR cigs to reform tonight. In addition models still show a few stray showers mainly over the coastal hills and MRY through 06Z. Patchy fog possible in the North Bay late tonight. The next system will bring rain to the North Bay Monday afternoon.

Vicinity of KSFO . VFR/MVFR with cigs 4000-5000 ft lowering to 3000-4000 ft after 06Z. West to northwest winds 10-15 kt decreasing after 04Z.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Cigs above 5000 ft lowering to near MVFR range tonight.

MARINE. As of 9:05 PM PDT Sunday . Low pressure off the Pacific Northwest and high pressure off the central and southern California coast will result in stronger winds over the southern waters off Big Sur. As the high builds northward by midweek northwest winds will increase. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: Dykema AVIATION: W Pi MARINE: W Pi

Visit us at www.weather.gov/sanfrancisco

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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 W 6 G 11 54°F 1019.9 hPa
PXSC1 9 mi48 min 56°F 51°F
AAMC1 - 9414750 - Alameda, CA 9 mi48 min W 5.1 G 9.9 55°F 58°F1021.2 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi48 min 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi48 min W 11 G 13
OBXC1 10 mi48 min 55°F 52°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi48 min WNW 8 G 12 55°F 1021.1 hPa
LNDC1 11 mi48 min WNW 7 G 9.9 55°F 1021.1 hPa
46237 - San Francisco Bar, CA (142) 14 mi48 min 56°F3 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi38 min NNW 1.9 53°F 1021 hPa
RTYC1 - 9414523 - Redwood City, CA 16 mi48 min WNW 9.9 G 11 54°F 59°F1021.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi48 min WSW 6 G 9.9 56°F 1021.2 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi48 min WSW 2.9 G 5.1 55°F 57°F1020.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi28 min WNW 12 G 14 54°F 56°F3 ft1021.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi48 min W 9.9 G 14 56°F 1020.5 hPa
UPBC1 29 mi48 min W 11 G 13
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi48 min SW 7 G 9.9 55°F 57°F1020.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 33 mi48 min SW 4.1 G 6 53°F 58°F1020.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi28 min NW 9.7 G 12 55°F 56°F3 ft1022 hPa50°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi48 min W 5.1 G 8 56°F 1020.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi93 min W 5.1

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 mi22 minW 910.00 miMostly Cloudy54°F48°F80%1021.2 hPa
Oakland, Metro Oakland International Airport, CA11 mi25 minWNW 710.00 miPartly Cloudy57°F48°F72%1021.3 hPa
Half Moon Bay Airport, CA12 mi23 minNW 1010.00 miOvercast54°F50°F88%1021.7 hPa
San Carlos Airport, CA14 mi28 minWSW 510.00 miPartly Cloudy54°F48°F82%1021.7 hPa
Hayward, Hayward Air Terminal, CA16 mi24 minWNW 710.00 miMostly Cloudy54°F48°F80%1022.1 hPa
Palo Alto Airport, CA21 mi31 minNW 610.00 miPartly Cloudy54°F48°F82%1021.3 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrSE3S5SE5S6SE6SE5SE5SE5S4SE6S3SE6SE5E5E7NE3NE3NW8CalmW11W9W9W9W9
1 day agoSW8SW7W5CalmS4S5S3SE5SW5S3S4SE5SE4E7E7E8E7NE4S7SW8SW7SW6SW3SW4
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Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
Click for Map
Mon -- 12:42 AM PDT     Moonset
Mon -- 04:10 AM PDT     6.41 feet High Tide
Mon -- 06:56 AM PDT     Sunrise
Mon -- 10:42 AM PDT     Moonrise
Mon -- 11:22 AM PDT     0.42 feet Low Tide
Mon -- 06:41 PM PDT     4.98 feet High Tide
Mon -- 07:31 PM PDT     Sunset
Mon -- 11:03 PM PDT     3.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.54.35.266.46.25.64.53.11.80.90.50.51.11.92.93.84.54.954.63.93.43.1

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
Mon -- 12:42 AM PDT     Moonset
Mon -- 01:52 AM PDT     0.47 knots Max Flood
Mon -- 04:29 AM PDT     -0.00 knots Slack
Mon -- 06:56 AM PDT     Sunrise
Mon -- 08:31 AM PDT     -1.03 knots Max Ebb
Mon -- 10:42 AM PDT     Moonrise
Mon -- 11:55 AM PDT     0.00 knots Slack
Mon -- 03:07 PM PDT     0.66 knots Max Flood
Mon -- 06:52 PM PDT     -0.00 knots Slack
Mon -- 07:31 PM PDT     Sunset
Mon -- 09:10 PM PDT     -0.43 knots Max Ebb
Mon -- 11:29 PM PDT     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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0.30.40.50.40.1-0.1-0.4-0.8-1-1-0.7-0.300.30.60.70.60.50.3-0-0.3-0.4-0.3-0.1

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 (0,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.