Saturday, February22, 2020
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Marine Weather and Tides
Daly City, 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 6:50AMSunset 5:56PM Friday February 21, 2020 11:09 PM PST (07:09 UTC) Moonrise 6:05AMMoonset 4:12PM Illumination 2% Phase: Waning Crescent; Moon at 28 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 900 Pm Pst Fri Feb 21 2020
.small craft advisory in effect from 6 am pst Saturday through late Saturday night...
Tonight..NW winds 10 to 20 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft at 14 seconds. SWell sw around 2 ft.
Sat..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 5 to 7 ft at 13 seconds.
Sat night..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 4 to 5 ft. NW swell 7 to 9 ft at 16 seconds.
Sun..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 5 to 6 ft. NW swell 7 to 9 ft at 16 seconds.
Sun night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. NW swell 6 to 8 ft at 15 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 14 seconds.
Mon night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 5 to 7 ft at 13 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft.
Wed..N winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 2 to 4 ft with a dominant period of 14 seconds. Across the bar...seas 3 to 5 ft with a dominant period of 14 seconds. Maximum ebb current of 2.1 kt at 03:43 am Saturday and 2.6 kt at 04:07 pm Saturday.
PZZ500 900 Pm Pst Fri Feb 21 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Low pressure just off point conception will move into southern california. There is a chance of showers over the southern waters late tonight and Saturday. Northwest winds are increasing over all of the waters as high pressure builds in behind the low. These winds will persist into next week. Expect moderate period northwest swell through early next week. A long period northwest swell is likely mid next week.


7 Day Forecast for Marine Location Near Daly City, CA
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location: 37.77, -122.54     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 220606 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1006 PM PST Fri Feb 21 2020

SYNOPSIS. A slight chance of light rain showers for the Central Coast into Saturday morning as a system to our south impacts southern California. High pressure redevelops by early next week bringing a continued dry and warm conditions regionwide.

DISCUSSION. as of 08:24 PM PST Friday . The main weather weather item of interest over the next 24 hours continues to be an upper level low pressure system passing to our south. For days now, model guidance and the official forecast have advertised rain chances for the southern half of the forecast area (mainly south of San Jose). The much anticipated rain "event" is turning out to be more of a fizzle. KMUX radar has been active since early this morning with several echoes moving over the Central Coast. Unfortunately, these radar returns are high based and not reaching the ground. The 00Z KOAK sounding indicates a rather dry airmass in place in the lower levels of the atmosphere, which is evaporating the rain. This is further confirmed by the lack of rainfall reports -whether it's from spotters or automated gauges. Hope isn't completely lost though. Models have definitely trended drier on the 00Z run, but as the upper low moves inland rain chances get a boast. Best chance for rain will be later tonight into early Saturday, but mainly focused over Monterey/San Benito. If rain does occur amounts will be light. Once the upper low does finally move inland precip chances will diminish rapidly by Saturday afternoon.

A notable warming and dry trend will develop on Sunday and more so next week. Looks like offshore flow could develop early next with 850 mb temperatures approaching 15C. If it does verify temperatures in the 80s are not out of the question for the interior.

AVIATION. as of 10:00 PM PST Friday . Upper level low off Point Conception will bring a chance of showers to the MRY Bay Area and possibly as far north as SJC but cloud bases will remain in the VFR range. Cooler northwest flow develops on Saturday may produce some afternoon instability cumulus clouds.

Vicinity of KSFO . VFR with high cloudiness. Some afternoon cumulus clouds at 5000 ft may develop. Winds remaining under 10 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. A chance for showers through 15Z with clouds bases getting as low as 5000 ft.

MARINE. as of 09:48 PM PST Friday . Low pressure just off Point Conception will move into southern California. There is a chance of showers over the southern waters late tonight and Saturday. Northwest winds are increasing over all of the waters as high pressure builds in behind the low. These winds will persist into next week. Expect moderate period northwest swell through early next week. A long period northwest swell is likely mid 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 . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 10 PM



PUBLIC FORECAST: MM AVIATION: W Pi MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 5 mi100 min 53°F6 ft
FTPC1 - 9414290 - San Francisco, CA 5 mi58 min SSW 4.1 G 4.1 57°F 55°F1014.8 hPa
PXSC1 8 mi58 min 61°F 44°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi58 min NW 4.1 G 6 60°F 1013.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 10 mi47 min Calm 57°F 1015 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi58 min N 6 G 8
OBXC1 11 mi52 min 57°F 48°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi58 min NNW 6 G 8 57°F 1014.9 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi58 min Calm G 2.9 61°F 57°F1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 13 mi58 min NNW 12 G 17 61°F 1014.9 hPa
RCMC1 - 9414863 - Richmond, CA 13 mi58 min NNW 9.9 G 12 60°F 55°F1014.3 hPa
LNDC1 14 mi58 min N 1.9 G 4.1 60°F 1014.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi40 min NW 18 G 21 53°F 53°F1015.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 25 mi58 min WSW 2.9 G 4.1 55°F 1014.7 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi58 min SW 1.9 G 1.9 62°F 58°F1015.5 hPa
UPBC1 29 mi58 min NW 5.1 G 8
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi58 min WNW 6 G 8 59°F 55°F1014.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 33 mi58 min Calm G 1 56°F 54°F1014.3 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi40 min NW 16 G 19 53°F 53°F1016 hPa50°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi58 min WSW 4.1 G 7 56°F 1014.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 40 mi85 min N 5.1

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA14 mi74 minNW 510.00 miMostly Cloudy61°F39°F46%1014.8 hPa
Oakland, Metro Oakland International Airport, CA18 mi77 minSE 510.00 miMostly Cloudy62°F42°F48%1015 hPa
San Carlos Airport, CA23 mi75 minN 010.00 miFair63°F35°F37%1015.2 hPa
Hayward, Hayward Air Terminal, CA24 mi76 minSSE 310.00 miFair61°F39°F44%1015.8 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW4CalmCalmN5S3SW3CalmS3S3NE3CalmNE4NE3CalmN3CalmE3CalmW10W10W9W11W12NW5
1 day agoW6CalmS3SW3CalmCalmSW3NW5NW7CalmCalmCalmNE4CalmCalmN3N3NW5W8W6W8W7W9W7
2 days agoW13W9W5W8W11S5S4CalmS3CalmCalmE4E5NE4NE3N4N5W9W10W14W13W9W11W10

Tide / Current Tables for Ocean Beach, outer coast, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Sat -- 02:17 AM PST     -0.96 knots Max Ebb
Sat -- 05:08 AM PST     0.00 knots Slack
Sat -- 06:41 AM PST     Moonrise
Sat -- 06:51 AM PST     Sunrise
Sat -- 08:01 AM PST     1.15 knots Max Flood
Sat -- 11:11 AM PST     -0.01 knots Slack
Sat -- 02:17 PM PST     -1.83 knots Max Ebb
Sat -- 05:11 PM PST     Moonset
Sat -- 05:52 PM PST     0.01 knots Slack
Sat -- 05:56 PM PST     Sunset
Sat -- 08:58 PM PST     1.48 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-0.7-1-0.9-0.6-0.10.511.210.70.1-0.7-1.5-1.8-1.7-1.4-0.80.10.91.31.51.30.9

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 (2,6,7,8)
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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.