Saturday, April4, 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 6:47AMSunset 7:37PM Saturday April 4, 2020 8:42 PM PDT (03:42 UTC) Moonrise 2:46PMMoonset 4:04AM Illumination 91% Phase: Waxing Gibbous; Moon at 12 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- 830 Pm Pdt Sat Apr 4 2020
.small craft advisory in effect from midnight pdt tonight through Sunday afternoon...
Tonight..SW winds 10 to 15 kt, becoming S 15 to 25 kt with gusts up to 30 kt after midnight. Wind waves 1 to 2 ft, increasing to 3 to 4 ft after midnight. W swell 3 to 5 ft at 9 seconds and S around 2 ft at 14 seconds. A chance of showers this evening, then showers after midnight.
Sun..SW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 3 to 5 ft at 10 seconds and S around 2 ft at 13 seconds. Showers and a slight chance of Thunderstorms.
Sun night..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 4 to 5 ft at 10 seconds and S around 2 ft at 13 seconds. A chance of showers.
Mon..W winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 9 seconds. A chance of showers.
Mon night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft at 9 seconds and S around 2 ft at 20 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 4 to 6 ft at 9 seconds and S around 2 ft at 19 seconds.
Tue night..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 9 seconds and S 2 to 3 ft at 18 seconds.
Wed..W winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 6 to 7 ft and S 2 to 3 ft.
Thu..W winds up to 10 kt. Wind waves 1 ft. W swell 5 to 6 ft and S 2 to 3 ft. Winds and wind waves higher in and near Thunderstorms.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 3 to 5 ft with a dominant period of 14 seconds. Across the bar...seas 4 to 6 ft with a dominant period of 14 seconds. Maximum ebb current of 2.4 kt at 03:07 am Sunday and 2.7 kt at 03:07 pm Sunday.
PZZ500 830 Pm Pdt Sat Apr 4 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 998 mb low will move into northern california Sunday morning. Southwesterly winds will increase overnight ahead of the low. Winds will switch to westerly Sunday afternoon and decrease unday night. There is a slight chance of Thunderstorms on Sunday. A prevailing moderate northwesterly swell will persist through much of the forecast period.


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 050021 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 521 PM PDT Sat Apr 4 2020

SYNOPSIS. Light to locally moderate showers will continue this afternoon and tonight as a cold front moves through the region. Showers overnight become a steady rain tomorrow as another system drops down the coast. Locally heavy rain, possible thunderstorms and gusty winds during the day tomorrow. Precipitation becomes showers tomorrow night into Monday as the upper low passes over the region. Showers may linger for the Central Coast Tuesday and Wednesday as the upper low slowly exits the region followed by a warming and drying trend for the second half of next week.

DISCUSSION. as of 01:45 PM PDT Saturday . Radar shows showers continue across the region this afternoon as a cold front moves through. Rainfall amounts have varied with as little as a few hundredths in some locations to over a quarter of an inch near Santa Rosa and along the coastal areas of the North Bay. Showers will continue the rest of the afternoon and this evening before turning into a more steady rainfall tomorrow as another cold front gets ready to pass through the area. The front is expected to reach the North Bay tomorrow morning before moving south of the Bay Area and into the Monterey Region in the late afternoon.

Tomorrow's system will be better organized with more upper level support creating some locally heavier rainfall along with periods of gusty winds and possible thunderstorms. Latest QPF guidance keeps the bulk of the heavier precipitation focused from the Santa Cruz mountains southward to the Santa Lucia's and Big Sur coast while reducing rainfall totals somewhat for areas elsewhere. Generally expect around 0.50"-0.75" for lower elevations and the Bay Area with 0.75"-1.25" around the Monterey Bay and 2-3 inches in the hills of the Central Coast. Locally higher rainfall totals will be possible for some of the Big Sur mountains. There will be a slight chance of thunderstorms across the region tomorrow afternoon through Monday afternoon, though the best chances will be outside of our area as the core of the upper low is still expected to remain offshore. Additionally, expect occasionally gusty winds as the front moves through tomorrow, particularly along the Big Sur Coast south of the Monterey Peninsula. Therefore the Wind Advisory for the southern Monterey Bay, Monterey Peninsula, Carmel Highlands, and Big Sur Coast will remain in effect for tomorrow morning into the early evening.

Showers will persist into tomorrow evening as the main surface boundary moves through, with the best rainfall chances at that point south of the Bay Area. Precipitation chances will remain in the forecast for Monday as the upper low slowly makes its way southward across the region. Activity will likely be more scattered with the higher elevations of the Central Coast and southward most likely to see thunderstorms on Monday. Little has changed with regard to snow levels. Sunday, when the bulk of the rain is expected, will see snow levels above 4500 feet before lowering to around 3000/3500 feet on Monday when precipitation is more scattered. Higher peaks may see a dusting though.

The upper low will then slowly make its way southward through mid-week. There are some timing differences between the GFS and the ECMWF at this point. The GFS moves the system into soCal more quickly and ends shower chances for the Central Coast by Tuesday afternoon while the ECMWF lags behind enough to keep showers lingering into Wednesday. Once the upper low does finally exit, high pressure will build back in late next week leading to warming and drying. Many interior locations may be in the low 70s towards the end of the week.

AVIATION. as of 5:20 PM PDT Saturday . The first of two systems is moving through the Bay Area this afternoon. This will bring light rain and mostly MVFR cigs through early evening. A short break from the rain in the Bay Area tonight with cigs rising. Southerly winds will start to increase rapidly after 09Z ahead of the second system. Could see gusts as high as 35 kt by Sunday morning as well as rain and reduced vsbys. Destabilizing atmosphere will bring a possibility of thunderstorms after 18Z.

Vicinity of KSFO . MVFR cigs will prevail with bases around 1500 ft. Bases could rise to 2500 ft tonight in between systems. Southerly winds to 15 kt increasing after 09Z with speeds as high as 20-25 kt gusting to 30-35 kt after 13Z. Winds switch to southwest and decrease after 19Z. Possibility of thunderstorms and lower cigs heading into Sunday afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . A weak frontal system will bring a few showers this evening with areas of MVFR cigs. The front will stall out and intensify early Sunday morning as the second system approaches. Rain should pick up after 12-15Z with MVFR cigs prevailing. Southerly winds increasing to 20-25 kt after 15Z especially in the Salinas Valley where gusts over 35 kt is possible. Possibility of thunderstomrs after 18Z.

MARINE. as of 04:57 PM PDT Saturday . Southwesterly winds will prevail through tonight as a storm system moves across the coastal waters. This storm will bring wet weather to the region through early next week. High pressure will return by the middle of next week bringing a return of drier weather. A prevailing moderate northwesterly swell will persist through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Wind Advisory . CAZ530 SCA . Pt Arena to Pigeon Pt 10-60 nm from 12 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 12 AM SCA . Pt Arena to Pt Reyes 0-10 nm from 12 AM SCA . Pt Reyes to Pigeon Pt 0-10 nm from 12 AM



PUBLIC FORECAST: AS AVIATION: W Pi MARINE: CW

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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 mi42 min 54°F4 ft
FTPC1 - 9414290 - San Francisco, CA 5 mi54 min 59°F
PXSC1 8 mi54 min 55°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi54 min W 2.9 G 9.9 54°F 1007.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 10 mi38 min SSE 5.1 53°F 1008 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi60 min SW 8 G 9.9
OBXC1 11 mi60 min 54°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi54 min WSW 5.1 G 7 54°F 1008.4 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi54 min SW 5.1 G 8 54°F 59°F1008.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 13 mi54 min SW 8 G 11 56°F 1008.5 hPa
RCMC1 - 9414863 - Richmond, CA 13 mi54 min SW 5.1 G 8.9 55°F 57°F1007.8 hPa
LNDC1 14 mi54 min SW 6 G 8 54°F 1008.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi32 min SSW 5.8 G 7.8 53°F 52°F1008.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 25 mi54 min SW 8.9 G 12 56°F 1007.7 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi54 min 60°F
UPBC1 29 mi54 min WSW 5.1 G 8
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi54 min SSW 4.1 G 5.1 54°F 58°F1008.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 33 mi54 min SW 5.1 G 8 53°F 58°F1007.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi32 min SW 7.8 G 9.7 54°F 54°F1008.7 hPa52°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi60 min WNW 4.1 G 6 54°F 1008 hPa
SFXC1 - San Francisco Bay Reserve, CA 40 mi57 min SW 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 mi46 minSW 94.00 miLight Rain Fog/Mist52°F48°F89%1008.4 hPa
Oakland, Metro Oakland International Airport, CA18 mi49 minWSW 116.00 miLight Rain Fog/Mist55°F51°F87%1008.7 hPa
Half Moon Bay Airport, CA18 mi47 minS 33.00 miLight Rain50°F50°F100%1009.1 hPa
San Carlos Airport, CA23 mi55 minS 52.00 miLight Rain Fog/Mist55°F53°F94%1008.8 hPa
Hayward, Hayward Air Terminal, CA24 mi48 minS 63.00 miLight Rain Fog/Mist55°F54°F96%1009.4 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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1 day agoW20
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W12W14W14W16W11W11W12NW63NE4NE5W7
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2 days agoW13W11W9W7W8W6W3W6W4SW5SW3W6N6N9N9N7W14W12--------W19
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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 -- 12:46 AM PDT     -1.03 knots Max Ebb
Sat -- 03:52 AM PDT     0.00 knots Slack
Sat -- 05:03 AM PDT     Moonset
Sat -- 06:40 AM PDT     1.07 knots Max Flood
Sat -- 06:50 AM PDT     Sunrise
Sat -- 09:51 AM PDT     -0.01 knots Slack
Sat -- 12:55 PM PDT     -1.83 knots Max Ebb
Sat -- 03:45 PM PDT     Moonrise
Sat -- 04:26 PM PDT     0.01 knots Slack
Sat -- 07:31 PM PDT     1.59 knots Max Flood
Sat -- 07:36 PM PDT     Sunset
Sat -- 11:07 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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-0.9-1-0.8-0.50.10.611.10.90.5-0.1-1-1.6-1.8-1.6-1.1-0.40.51.21.51.61.30.80.1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (23,6,7,8)
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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.