Friday, February21, 2020
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Marine Weather and Tides
Pacifica, 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 7:44 AM PST (15:44 UTC) Moonrise 6:04AMMoonset 4:12PM Illumination 5% 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- 231 Am Pst Fri Feb 21 2020
.small craft advisory in effect from Saturday morning through Saturday afternoon...
Today..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 15 seconds and sw around 2 ft at 15 seconds.
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 15 seconds and sw around 2 ft at 14 seconds.
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 5 to 6 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 5 to 6 ft. NW swell 6 to 8 ft at 15 seconds.
Mon..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 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 2.0 kt at 02:49 am Friday and 2.6 kt at 03:07 pm Friday.
PZZ500 231 Am 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... An upper level low located 500 miles southwest of the Monterey peninsula will move to near point conception by early Saturday morning then quickly move eastward over the weekend. The low will bring a chance of showers over the southern coastal waters late tonight and Saturday. A strong high pressure system will build over the eastern pacific late in the weekend and next week. Northwest winds will increase over the northern waters by early tonight and increase to the south on Saturday. 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 Pacifica, CA
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location: 37.62, -122.51     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 211258 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 458 AM PST Fri Feb 21 2020

SYNOPSIS. Warmer temperatures and dry conditions Friday. A slight chance exists for light precipitation for the Central Coast late Friday into Saturday morning with minimal accumulations. High pressure builds over the weekend bringing a warming trend next week and keeping dry conditions in place around the Bay Area.

DISCUSSION. as of 02:57 AM PST Friday . High clouds continue move over the Bay Area and the Central Coast, as a low pressure system over the Eastern Pacific moves eastward. The high clouds are keeping temperatures on the warmer side with forecasted values in the 40s, and isolated areas touching the upper 30s. San Francisco itself should be around 50 degrees. Cloud cover will increase as the system draws closer to Southern California.

Dry and mild conditions will prevail on Friday for San Francisco and points north of San Jose. The Central Coast however has a slight chance to see some light precipitation Friday evening and into Saturday morning as the low pressure system moves eastward. Rain is possible, but most areas will only see a trace amount, with higher elevations in Southern Monterey County most likely to see precip. Accumulations are forecast to be less than a tenth of an inch, with isolated amounts slightly higher at those same elevated locations.

Winds are expected to be breezy as the low approaches the coastline and shift to the southeast as the low continues inland. Behind the low, an upper level ridge will build and return the wind flow to onshore on Saturday. Temperatures will remain mild with dry conditions around the region. These dry conditions will remain through next week as the ridge grows, but a warming trend is forecast late in the week as high pressure intensifies.

With the exception of those that will see light rain with the passing system Friday night, it looks more and more likely that February will see little to no rain for the area. In the realm of wishcasting, the GFS has started showing signs of a longer wave trough moving through in early March. The ECMWF has a similar trough approaching. But of course, the models are different and therefore so are their depictions of what may happen. The Euro is a couple days earlier passing over the Bay Area, while the GFS is slightly later and a bit more to the south. That being said, it is still well over 200 hours out and hardly anything more than a desperate attempt to sound optimistic.

AVIATION. as of 4:58 AM PST Friday . A band of echoes in advance of an upper low well to the southwest of the Monterey Peninsula is showing up on KMUX radar as close as the southern inner waters and southern Monterey County this morning; steepening 700 mb to 500 mb temperature lapse rates through 18z today will accompany these echoes per NAM forecasts, similar lapse rates to where a batch of lightning occurred much closer to the low center well to our southwest earlier this morning. That instability however was next to a dry air intrusion behind the low and closer to the coldest pool of mid level air. Models have struggled with forecasting qpf with this low, difficulty primarily with the potential for mid level convection, but also trying to model the broader scale dynamic lift and consequently if/where it will precipitate. The low has got caught up in and reinvigorated by the subtropical jet stream. 12z TAFs continue VFR then cloud ceilings lowering, lowest to the south, as well as include isolated showers, and a period of rain reaching the north Central Coast. Radar and satellite will be monitored, TAFs amended as needed.

Vicinity of KSFO . VFR. Mid to high level cloud cover today and tonight, generally trending lower with time. Will monitor radar and satellite and see how far north any precipitation may get with this system.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Mid level clouds lowering, a few rain showers are possible this morning with a band of echoes moving up from the south. Model forecasts do not indicate any precipitation this morning, but do show better chances later today into tonight.

MARINE. as of 2:57 AM PST Friday . An upper level low located 500 miles southwest of the Monterey Peninsula will move to near Point Conception by early Saturday morning then quickly move eastward over the weekend. The low will bring a chance of showers over the southern coastal waters late tonight and Saturday. A strong high pressure system will build over the eastern Pacific late in the weekend and next week. Northwest winds will increase over the northern waters by early tonight and increase to the south on Saturday. Expect moderate period northwest swell through early next week. A long period northwest swell is likely mid next week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: DK AVIATION/MARINE: Canepa

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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) 13 mi45 min 53°F3 ft
FTPC1 - 9414290 - San Francisco, CA 13 mi63 min N 6 G 7 54°F1019.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi57 min NW 5.1 G 7 52°F 1018.2 hPa
PXSC1 14 mi57 min 53°F 50°F
AAMC1 - 9414750 - Alameda, CA 15 mi57 min Calm G 1 51°F 56°F1019.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi63 min N 6 G 12
OBXC1 16 mi63 min 53°F 46°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi57 min NNE 7 G 8 53°F 1019.1 hPa
LNDC1 17 mi57 min ESE 2.9 G 2.9 1019 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi63 min WSW 2.9 G 2.9 51°F 57°F1019.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 19 mi106 min W 4.1 50°F 1019 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi35 min NW 5.8 G 7.8 53°F 53°F1019.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi57 min N 8.9 G 11 51°F 1019.3 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi57 min N 8 G 11 55°F 54°F1018.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 27 mi45 min NNW 12 G 14 53°F 53°F1019.2 hPa51°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi57 min S 1 G 1.9 49°F 1019.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi63 min SSW 1.9 G 2.9 48°F 54°F1019.3 hPa
UPBC1 35 mi57 min WNW 5.1 G 6
PCOC1 - 9415144 - Port Chicago, CA 39 mi57 min SSW 7 G 8 48°F 54°F1018.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi63 min Calm G 1 49°F 1019 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi120 min SSE 1.9

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, CA8 mi1.8 hrsS 310.00 miMostly Cloudy51°F41°F69%1018.9 hPa
Half Moon Bay Airport, CA8 mi50 minNE 9 G 1410.00 miFair57°F37°F48%1018.6 hPa
San Carlos Airport, CA15 mi50 minWNW 310.00 miFair50°F41°F71%1019.3 hPa
Oakland, Metro Oakland International Airport, CA16 mi52 minN 010.00 miA Few Clouds48°F39°F71%1019.3 hPa
Hayward, Hayward Air Terminal, CA21 mi51 minNE 410.00 miFair48°F36°F63%1020 hPa
Palo Alto Airport, CA23 mi58 minN 010.00 miA Few Clouds43°F37°F81%1019.3 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrCalmW3NW3NW5NW5NW7NW8N4--NW4N3CalmNW3NE3CalmN5NE4CalmNW3CalmNW3NE12NE8NE10
1 day agoCalmS3CalmNW7W8NW9NW7NW8NW8----CalmCalmCalm----E3CalmNE3CalmCalmCalmCalmNE3
2 days agoCalmCalmCalmNW5--------------N4NE3CalmCalmCalmNE3NE5CalmCalmCalmNE4CalmCalm

Tide / Current Tables for Seaplane Harbor, San Francisco Bay, California
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Seaplane Harbor
Click for Map
Fri -- 04:51 AM PST     2.65 feet Low Tide
Fri -- 06:03 AM PST     Moonrise
Fri -- 06:52 AM PST     Sunrise
Fri -- 10:29 AM PST     7.51 feet High Tide
Fri -- 04:12 PM PST     Moonset
Fri -- 05:34 PM PST     -0.38 feet Low Tide
Fri -- 05:54 PM PST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.45.94.83.72.92.73.14.15.46.67.47.46.75.33.51.80.4-0.3-0.30.31.534.55.8

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
Fri -- 02:26 AM PST     -0.67 knots Max Ebb
Fri -- 04:53 AM PST     0.00 knots Slack
Fri -- 06:03 AM PST     Moonrise
Fri -- 06:52 AM PST     Sunrise
Fri -- 07:57 AM PST     0.84 knots Max Flood
Fri -- 10:44 AM PST     -0.00 knots Slack
Fri -- 02:20 PM PST     -1.38 knots Max Ebb
Fri -- 04:12 PM PST     Moonset
Fri -- 05:41 PM PST     0.01 knots Slack
Fri -- 05:54 PM PST     Sunset
Fri -- 09:00 PM PST     1.14 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-0.5-0.7-0.6-0.400.50.70.80.70.4-0.2-0.7-1.2-1.4-1.3-1-0.50.20.711.110.6

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 (10,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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Disclaimer:
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.