Friday, April3, 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 6:49AMSunset 7:36PM Friday April 3, 2020 4:15 AM PDT (11:15 UTC) Moonrise 1:35PMMoonset 3:21AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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- 328 Am Pdt Fri Apr 3 2020
.small craft advisory in effect through late tonight...
Today..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 6 to 7 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 15 seconds.
Tonight..NW winds 15 to 25 kt with gusts up to 35 kt. Wind waves 5 to 6 ft. Mixed swell nw around 3 ft at 10 seconds and sw around 2 ft at 15 seconds.
Sat..SW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 15 seconds. Rain.
Sat night..SW winds 10 to 15 kt. Wind waves 2 to 3 ft. W swell 3 to 5 ft at 10 seconds and S around 2 ft at 14 seconds. Rain likely.
Sun..S winds 20 to 30 kt with gusts up to 35 kt. Wind waves 5 to 6 ft. W swell 3 to 5 ft at 10 seconds and S around 2 ft at 13 seconds. Rain.
Sun night..SW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 9 seconds and S around 2 ft at 13 seconds. A chance of rain.
Mon..W winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft and S around 2 ft. A chance of rain.
Tue..NW winds up to 10 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft and S 2 to 3 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 7 to 9 ft with a dominant period of 9 seconds. Across the bar...seas 7 to 9 ft with a dominant period of 9 seconds. Maximum ebb current of 2.3 kt at 01:13 pm Friday and 1.9 kt at 02:25 am Saturday.
PZZ500 328 Am Pdt Fri Apr 3 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong northwest winds will generate fresh and steep wind generated waves creating hazardous conditions for smaller vessels. Winds will then subside by early Saturday morning. A cold upper level low from the gulf of alaska will bring wet weather to the coastal waters and bays this weekend and next week. A moderate northwesterly swell will prevail through much of the forecast period.


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 031019 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 319 AM PDT Fri Apr 3 2020

SYNOPSIS. Sunny and mild weather today with clouds increasing by tonight ahead of the Saturday cold front. Light rain develops in the North Bay Saturday morning spreading across the Bay Area Saturday afternoon and evening. A second system drops down the coast Sunday keeping a steady rain going for much of the day across the region. Precipitation becomes more showery Sunday night into Monday as the upper low drops down the coast. The parent low will cut-off over Southern California keeping temperatures below normal and the chance of showers in the forecast through midweek.

DISCUSSION. as of 3:20 AM PDT Friday . Skies are mostly clear with just some patchy clouds so far in favored locations such as Half Moon Bay and Monterey. Today will be one last quiet weather days with sunshine and highs generally in the 60s. By tonight clouds will be on the increase as the first shortwave drops down from the Gulf of Alaska. Model timing remains consistent and expect rain to develop in the North Bay by around 12z Saturday morning. Light rain slowly spreads southward across the Bay area through lunchtime and the afternoon hours of Saturday with the front losing much of its punch by the time it reaches the Central Coast. Rain amounts by Saturday evening should be up to a half inch in the North Bay with 0.10-0.25 Bay Area southward and little or no rainfall south of Salinas.

There are some subtle but noteworthy changes for the Sunday system. The 00z and 06z NAM keep the core of the upper low and associated cold air farther offshore. The end result will still be a rainy Sunday across the Bay Area as the slow moving boundary impacts the region. The convective parameters dont look nearly as impressive compared to 24 hours ago and snow levels will be much higher through Sunday afternoon with 850 mb temps above zero. Other factor to watch will be the position of the low may induce more unfavorable southeast wind flow versus southwest upslope flow. So some of the exciting meteorological factors are fading on Sunday (t-storms, lowering snow levels, etc) but still expecting a soaking rainfall.

On Sunday night into Monday the coldest air aloft may pass over the region with precip becoming more showery. Forecast will now show t-storm chances on Monday afternoon. Rainfall totals by Monday evening of 0.50-1.00 lower elevations with 1-2 inches for the hills.

ECMWF keeps the low wobbling around Pt Conception right through Weds so lingering showers, especially from the Santa Cruz mtns southward remain in the forecast for Tuesday/Weds with temps running below seasonal norms. The low may finally eject by Thursday/Friday of next week.

AVIATION. as of 10:36 PM PDT Thursday . For 06Z TAFs. VFR across the Bay Area and the Central Coast. Skies are mostly clear with a slight chance for a few clouds between 1,500 and 2,0000 developing. Winds are onshore and currently are still breezy. The winds will ease slightly overnight before strengthening on Friday; though staying onshore. There is a chance for some stronger gusts in the afternoon ahead of the next weather system over the ocean moving towards the region (arriving Saturday). Sky conditions are forecast to remain VFR.

Vicinity of KSFO . Northwesterly winds remain breezy breezy, but will subside slightly overnight as skies remain clear. Upslope flow along the coast makes KHAF MVFR, so there is a slight chance for FEW to SCT cigs overnight but there is low confidence it moves over the terminal. VFR conditions are forecast for Friday. Winds will remain onshore and strengthen providing stronger gusts in the afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Winds continue to taper off, but remain breezy. Possible FEW to SCT cigs show up briefly overnight around 1,500 to 2,000 feet, similar to last night, but there is low confidence as skies are forecast to be mostly clear. VFR on Friday as winds strengthen in the afternoon with stronger gusts possible.

MARINE. as of 02:22 AM PDT Friday . Strong northwest winds over the waters with occasional gale force gusts possible through tonight and into Friday. Fresh and steep wind generated waves can be produced, creating hazardous conditions for smaller vessels. Winds will start to subside late Friday and into the weekend. A moderate, predominately winds driven, northwesterly swell will prevail through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm 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 SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Mry Bay until 3 AM



PUBLIC FORECAST: RWW AVIATION: Canepa 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 54°F6 ft
FTPC1 - 9414290 - San Francisco, CA 13 mi45 min 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi45 min W 1.9 G 5.1 49°F 1017.4 hPa
PXSC1 14 mi45 min 51°F 41°F
AAMC1 - 9414750 - Alameda, CA 15 mi45 min W 4.1 G 6 51°F 59°F1018.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi45 min ESE 2.9 G 5.1
OBXC1 16 mi45 min 51°F 43°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi45 min SE 2.9 G 4.1 50°F 1018.4 hPa
LNDC1 17 mi45 min ESE 4.1 G 5.1 50°F 1018.3 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi45 min S 1.9 G 1.9 47°F 60°F1019.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 19 mi35 min Calm 47°F 1018 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi25 min NW 21 G 27 51°F 53°F10 ft1019.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi45 min NE 1.9 G 1.9 52°F 1018.7 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi45 min NW 8 G 9.9 50°F 57°F1018.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 27 mi25 min NNW 23 G 29 51°F 54°F11 ft1019.9 hPa45°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi45 min W 8 G 9.9 51°F 1017.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi45 min SW 6 G 7 49°F 58°F1018 hPa
UPBC1 35 mi45 min WSW 8 G 9.9
PCOC1 - 9415144 - Port Chicago, CA 39 mi45 min SW 8.9 G 11 49°F 58°F1017.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi45 min WNW 11 G 14 52°F 1017.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi90 min WSW 8

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 mi19 minW 1410.00 miFair50°F39°F66%1018.3 hPa
Half Moon Bay Airport, CA8 mi20 minNNW 11 G 149.00 miMostly Cloudy48°F41°F76%1019.3 hPa
San Carlos Airport, CA15 mi20 minN 010.00 miFair46°F39°F76%1019 hPa
Oakland, Metro Oakland International Airport, CA16 mi22 minN 010.00 miA Few Clouds45°F39°F83%1018.5 hPa
Hayward, Hayward Air Terminal, CA21 mi21 minSW 510.00 miFair50°F43°F77%1019.3 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrNE3E4N10N9N11N12NW13NW13NW16NW14NW13--NW14
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2 days agoNW4N3N4CalmN3NW6NW8NW10NW12NW12
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Tide / Current Tables for Seaplane Harbor, San Francisco Bay, California
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Seaplane Harbor
Click for Map
Fri -- 03:09 AM PDT     2.88 feet Low Tide
Fri -- 04:19 AM PDT     Moonset
Fri -- 06:50 AM PDT     Sunrise
Fri -- 08:32 AM PDT     6.70 feet High Tide
Fri -- 02:33 PM PDT     Moonrise
Fri -- 03:46 PM PDT     -0.26 feet Low Tide
Fri -- 07:34 PM PDT     Sunset
Fri -- 10:46 PM PDT     6.20 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.943.22.93.13.84.95.96.66.66.153.620.7-0.1-0.20.21.22.53.95.166.2

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 -- 12:29 AM PDT     -0.58 knots Max Ebb
Fri -- 03:27 AM PDT     0.00 knots Slack
Fri -- 04:19 AM PDT     Moonset
Fri -- 06:17 AM PDT     0.61 knots Max Flood
Fri -- 06:50 AM PDT     Sunrise
Fri -- 09:05 AM PDT     -0.00 knots Slack
Fri -- 12:38 PM PDT     -1.25 knots Max Ebb
Fri -- 02:33 PM PDT     Moonrise
Fri -- 04:05 PM PDT     0.00 knots Slack
Fri -- 07:23 PM PDT     1.07 knots Max Flood
Fri -- 07:34 PM PDT     Sunset
Fri -- 10:44 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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-0.6-0.6-0.4-0.20.20.50.60.60.40-0.4-0.9-1.2-1.2-1-0.6-0.10.50.91.110.80.4-0.1

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 (7,2,3,4)
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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.