Tuesday, December10, 2019
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Marine Weather and Tides
Pacifica, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:11AMSunset 4:52PM Monday December 9, 2019 9:03 PM PST (05:03 UTC) Moonrise 3:30PMMoonset 4:31AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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- 836 Pm Pst Mon Dec 9 2019
Tonight..NW winds up to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 14 seconds.
Tue..S winds around 5 kt. Wind waves 1 ft. W swell 3 to 5 ft at 14 seconds. A chance of rain.
Tue night..SE winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 15 seconds. A chance of rain.
Wed..SE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 15 seconds. A slight chance of rain.
Wed night..W winds around 5 kt. Wind waves 1 ft. W swell 5 to 7 ft at 16 seconds.
Thu..S winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 20 seconds.
Thu night..W winds around 5 kt. Wind waves 1 ft. W swell 11 to 13 ft at 18 seconds.
Fri..NW winds up to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft.
Sat..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 8 to 10 ft. A chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 11 seconds. Across the bar...seas 6 to 8 ft with a dominant period of 11 seconds. Maximum ebb current of 1.2 kt at 02:43 am Tuesday and 3.6 kt at 02:37 pm Tuesday.
PZZ500 836 Pm Pst Mon Dec 9 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will continue to be light over the coastal waters tonight and into Tuesday morning. Patchy fog is possible Tuesday morning. A weak system approaches from the northwest moving toward san francisco Tuesday night, bringing a chance of showers in the evening and into Wednesday while winds turn southerly. The moderate northwest swell will continue through the end of the week before a larger and longer period northwest swell arrives closer to the weekend.


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 100236 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 636 PM PST Mon Dec 9 2019

SYNOPSIS. Dry conditions with mild temperatures are forecast through Tuesday afternoon. Patchy dense fog is likely during the night and morning hours. A weak weather system may produce light rain from late Tuesday into early Wednesday. Dry conditions are then forecast for most of the second half of the work week before rain chances increase by Friday night or Saturday.

DISCUSSION. as of 12:55 PM PST Monday . Fog blanketed a good portion of the San Francisco Bay Area and parts of the central California coast this morning. Many airports throughout the region reported visibilities down to 1/4 mile or less. By mid-morning, the severity of the fog had gradually improved, allowing for the Dense Fog Advisory to expire as scheduled at 10 AM PST. With that said, though, as of mid-day overcast skies and locally-reduced visibilities are still being observed. Some locations may never clear this afternoon. With the high-amplitude upper level ridge over our area, will likely see a repeat overnight tonight and into Tuesday morning with fog impacting the area valleys and locations near sea level. Will monitor visibility trends closely and let the evening or night shift make the determination about any new Dense Fog Advisories.

The upper level ridge will quickly push eastward into the North American continent during the day on Tuesday. A fast-moving shortwave trough will then approach the California coast late Tuesday and into Wednesday. The precipitation associated with this shortwave will be light. Best potential for more than a few tenths of an inch of rain will be in the North Bay. The latest 3-km NAM brings around a tenth to a quarter of an inch to San Francisco and the East Bay with lesser amounts in the Santa Clara Valley. The timing of this rain looks to fall in the middle to late evening hours on Tuesday, wrapping up early to middle morning Wednesday. Some locations in Monterey and San Benito County will likely remain dry. Overall, low impacts are anticipated.

A broad, flat upper level ridge in the eastern Pacific between 20 and 30 degrees north latitude will largely push the core storm track to our north from the middle of the week onward. Models advertise a strong system to impact the Pacific Northwest and British Columbia late Wednesday and into Thursday. The North Bay will be on the far southern end of this system with the potential for light rain on Thursday or Friday. Little rainfall (if any) is expected south of the Golden Gate based on the latest guidance. Again, little or no weather-related impacts anticipated in our area.

And behind the late week system comes another shortwave trough over the weekend. Models have backed off a bit over the past several model runs in terms of rainfall totals, indicating a few or several tenths of an inch of rain. If the forecast plans out, little or no weather-related impacts are expected this this system as well.

Looking ahead to late this weekend and into early next week, both the GFS and ECMWF bring a ridge back to the West Coast. While this week from a synoptic meteorological aspect is rather active, the overall rain impacts from the series of successive systems will likely remain low for the San Francisco Bay Area.

AVIATION. as of 3:58 PM PST Monday . For 00z TAFs. Stratus clouds have already moved into the coastal parts of the North Bay and coastal San Francisco while they currently are still out to sea near Monterey Bay. Expect mid level clouds through the evening with reductions to vis and cigs tonight and into the early part of tomorrow morning. Fog is forecast for many terminals around the Bay Area with impacts to vis providing IFR and even LIFR conditions possible. Winds remain generally light. Clouds should scatter out by midday on Tuesday.

Vicinity of KSFO . VFR to MVFR conditions at 00z with stratus clouds currently looming at mid-levels with light winds. Those light winds will prevail through the night. However, vis and low cigs are of concern in the early morning hours. Fog is not in the KSFO TAF currently given the lack of fog at the terminal yesterday morning, despite many other Bay Area terminals experiencing it. By about 20z, clouds should scatter out and allow for VFR conditions once again with light winds. Chances of rain are in the forecast for Tuesday night.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Mostly VFR conditions around 00z for the MRY Bay terminals. But low clouds are expected to return this evening. Winds will swing around to the southeast and remain light. Cigs and vis reduce through the night with fog expected to impact terminals in the early morning hours. Most clouds should scatter out by 20z and winds remain out of the south-southeast.

MARINE. as of 03:45 PM PST Monday . Light winds are forecast to prevail over the coastal waters tonight and into Tuesday. Areas of fog will likely develop overnight and into Tuesday. A weak system will then move through the region early this week bringing a chance of showers Tuesday night into Wednesday while winds turn southerly. Moderate northwest swell will persist through much of the week before a larger and longer period northwest swell arrives late this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. None.

PUBLIC FORECAST: Rowe AVIATION: DK MARINE: CW/AS

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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 mi33 min 54°F3 ft
FTPC1 - 9414290 - San Francisco, CA 13 mi51 min WNW 4.1 G 6 54°F 54°F1023.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi45 min W 6 G 8.9 54°F 1022.4 hPa
AAMC1 - 9414750 - Alameda, CA 15 mi51 min Calm G 0 54°F 55°F1023.4 hPa
OBXC1 16 mi45 min 54°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi45 min WNW 7 G 8 54°F 1023.4 hPa
LNDC1 17 mi45 min W 2.9 G 6 55°F 1023.3 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi45 min NW 6 G 7 54°F 57°F1023.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 19 mi52 min Calm 53°F 1024 hPa (+1.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi23 min NNW 5.8 G 9.7 54°F 56°F1023.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi45 min N 4.1 G 6 55°F 1023.7 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi51 min N 1.9 G 5.1 54°F 55°F1023 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 27 mi23 min NW 9.7 G 12 54°F 57°F1023.7 hPa49°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi45 min NW 4.1 G 6 53°F 1023.1 hPa
UPBC1 35 mi45 min WNW 7 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi51 min W 6 G 7 53°F 54°F1023.3 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi45 min 54°F1023.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi45 min WSW 7 G 8 51°F 53°F1022.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi51 min W 4.1 G 6 53°F 1022.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi78 min W 4.1 46°F 1023 hPa46°F

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 mi67 minWNW 69.00 miMostly Cloudy55°F46°F74%1023 hPa
Half Moon Bay Airport, CA8 mi68 minNNE 310.00 miOvercast54°F48°F82%1023.4 hPa
San Carlos Airport, CA15 mi4.3 hrsN 410.00 miMostly Cloudy55°F50°F82%1022.3 hPa
Oakland, Metro Oakland International Airport, CA16 mi70 minN 010.00 miOvercast55°F46°F74%1023.3 hPa
Hayward, Hayward Air Terminal, CA21 mi69 minN 010.00 miOvercast54°F46°F77%1024.1 hPa
Palo Alto Airport, CA23 mi76 minNNW 510.00 miOvercast54°F48°F82%1023 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrN6CalmCalmCalmCalmCalmCalmE4E3E4NE8NE4CalmNW4NW7N7NW7NW9NW10N7N6N6N6N3
1 day agoS11
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SW5SW5S5S4S4S3CalmCalmNW6N3CalmNW4NW4W6NW3W4NW5NW8NW7N5N4N8
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Tide / Current Tables for Point San Bruno, San Francisco Bay, California
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Point San Bruno
Click for Map
Tue -- 04:31 AM PST     2.50 feet Low Tide
Tue -- 05:32 AM PST     Moonset
Tue -- 07:13 AM PST     Sunrise
Tue -- 10:14 AM PST     7.28 feet High Tide
Tue -- 04:04 PM PST     Moonrise
Tue -- 04:50 PM PST     Sunset
Tue -- 05:34 PM PST     -0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.44.83.93.12.62.63.24.35.66.77.37.16.353.31.70.5-0.2-0.20.51.62.94.25.2

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
Tue -- 01:56 AM PST     -0.69 knots Max Ebb
Tue -- 04:41 AM PST     0.00 knots Slack
Tue -- 05:32 AM PST     Moonset
Tue -- 07:13 AM PST     Sunrise
Tue -- 07:43 AM PST     0.80 knots Max Flood
Tue -- 10:40 AM PST     -0.01 knots Slack
Tue -- 02:11 PM PST     -1.38 knots Max Ebb
Tue -- 04:04 PM PST     Moonrise
Tue -- 04:50 PM PST     Sunset
Tue -- 05:39 PM PST     0.01 knots Slack
Tue -- 08:48 PM PST     1.03 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-0.6-0.7-0.5-0.30.10.50.70.80.60.3-0.2-0.7-1.2-1.4-1.3-0.9-0.40.20.7110.90.6

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.
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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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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 numerious 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.