Thursday, December5, 2019
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Marine Weather and Tides
Bolinas, 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 7:08AMSunset 4:52PM Thursday December 5, 2019 9:33 AM PST (17:33 UTC) Moonrise 1:41PMMoonset 12:43AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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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PZZ571 Waters From Point Reyes To Pigeon Point 10-60 Nm- 819 Am Pst Thu Dec 5 2019
.small craft advisory in effect from 3 pm pst this afternoon through Friday morning...
.gale warning in effect from Friday afternoon through Friday evening...
Today..S winds 10 to 20 kt. Wind waves 1 to 2 ft, increasing to 3 to 4 ft this afternoon. NW swell 5 to 7 ft at 13 seconds.
Tonight..SE winds 20 to 30 kt with gusts up to 35 kt. Wind waves 6 to 7 ft. NW swell 3 to 5 ft at 13 seconds. A chance of rain.
Fri..SE winds 25 to 30 kt with gusts up to 40 kt. Wind waves 9 to 10 ft. W swell 6 to 8 ft at 16 seconds. Rain.
Fri night..S winds 25 to 35 kt with gusts up to 40 kt. Wind waves 8 to 9 ft. W swell 9 to 11 ft at 17 seconds. Showers and a slight chance of Thunderstorms.
Sat..S winds 20 to 30 kt with gusts up to 35 kt. Wind waves 6 to 7 ft. W swell 11 to 13 ft at 14 seconds. Showers and a slight chance of Thunderstorms.
Sat night..SW winds 10 to 15 kt. Wind waves 3 to 4 ft. W swell 10 to 12 ft at 13 seconds. A chance of rain.
Sun..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 6 to 7 ft and S around 2 ft. A chance of rain.
Mon..NE winds 5 to 10 kt. Wind waves 1 ft. NW swell 5 to 6 ft and S around 2 ft. Winds and wind waves higher in and near Thunderstorms.
PZZ500 819 Am Pst Thu Dec 5 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate southerly winds today ahead of an approaching low pressure will strengthen further late tonight into Friday with an arriving cold front. Gale force winds are expected late Thursday night and into Friday. Moderate northwest swell will gradually build to around 10 to 15 feet Friday over the northern waters then spread south across the coastal waters over the weekend.


7 Day Forecast for Marine Location Near Bolinas, CA
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location: 37.67, -123.15     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 051622 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 822 AM PST Thu Dec 5 2019

SYNOPSIS. After a brief break in wet weather conditions today, another cold front will sweep through the area on Friday resulting in widespread rainfall and gusty winds. Post-frontal showers and potentially isolated thunderstorms will continue through Saturday night before tapering off on Sunday.

DISCUSSION. as of 8:22 AM PST Thursday . There are still a few areas of fog impacting the morning commute. The Livermore ASOS is reporting 1/4 mile in fog, and Palo Altor is now indicating 1/2 mile visibility. Aside from these, visibilities are starting to improve, and range from from 3 or greater across the San Francisco Bay Area. Shower activity has pretty much ended, with no echoes being picked up by KMUX at this time.

We should see a break in our rainy pattern today with the next storm system due impact the area on Friday and Saturday with rainfall and gusty winds. Light showers are expected to begin Friday afternoon ahead of this system. The latest model guidance has slowed down the timing of the cold front passage, with the front moving into the North Bay late Friday afternoon then gradually moving south and east overnight. The Friday evening commute will likely be impacted across the North Bay and possibly SF, but areas southward not as much. Given the dynamics with the potent cold front and ample moisture, rainfall intensity will be of concern across the North Bay, especially in the Kincade Burn area. Hourly rainfall rates could exceed one half an inch in an hour leading to debris flows or flash flooding. Therefore, a Flash Flood Watch has been issued for the Kincade burn area Friday afternoon through Saturday morning. By Saturday morning the cold front will have pushed through much of the Bay Area. However, the parent low and upper trough moving through will keep showers going across the Bay Area Saturday into Sunday. Enough instability will be present with the frontal passage and with the upper trough justifying a slight chance of thunderstorms for Friday and Saturday. Rainfall totals from Friday into early Sunday range from 0.50"-1.25" in most urban areas, except 1.50-2.50" in the North Bay Valleys. In the hills/mountains, rain totals are forecast to range from 1.50"-4.00" in the North Bay Mountains, 1.25- 1.5" for the East Bay Hills, 1.50-3.00" in the Santa Cruz Mountains, and 1.00-3.00" across Monterey and San Benito Co. Mountains. Lesser amounts will be possible in the southern Salinas Valley.

In addition to the rain, southerly winds will ramp up ahead of and with the frontal passage. Winds will be strongest over the coastal waters, near the coast, and in the higher terrain. May need to consider possible wind advisory products later today.

A few lingering showers will be possible on Sunday as the upper trough slowly exits. High pressure aloft building in over the state will bring drier weather to the area Monday through at least Wednesday. A weak system is forecast to move across Northern California on Wednesday which could bring a few showers to northern zones late Wednesday.

AVIATION. as of 3:45 AM PST Thursday . For 12Z TAFs. Lingering low level moisture and the remnants of the previous low pressure system has resulting in a mixed bag of weather this morning with patchy fog over select terminals and rain showers over the North Bay. Have updated the TAFs to reflect lower vsbys and cigs as well as rain showers for the next several hours. Otherwise forecast remains on track with light east to southeasterly winds across all terminals. Southeast winds will begin to pick up slight this afternoon with speeds approaching 8-10 kt at most terminals.

Vicinity of KSFO . Borderline IFR/MVFR cigs around 800-1000 ft will prevail this morning before lifting late morning to around 1500-2500 ft. Light east winds tonight become southeast 5-10 kt by this afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Mainly VFR conditions will prevail with borderline MVFR/VFR cigs developing later this morning. Moderate southeast winds will persist over KSNS with speeds of 10-15 kt. Light winds will persist over KMRY.

MARINE. as of 2:51 AM PST Thursday . Moderate southerly winds ahead of an approaching low pressure will strengthen further late tonight into Friday as the associated cold front approaches and then moves through the coastal waters. Gale force winds are expected late Thursday night and into Friday. Moderate northwest swell will gradually build to around 10 to 15 feet Friday over the northern waters then spread south across the coastal waters over the weekend.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pt Reyes 0-10 nm from 9 AM SCA . Pt Arena to Pigeon Pt 10-60 nm from 9 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 9 AM



PUBLIC FORECAST: Sims AVIATION: CW MARINE: CW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi24 min E 14 G 18 54°F 54°F1018.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 24 mi58 min 54°F1017.5 hPa
46214 - Point Reyes, CA (029) 25 mi34 min 56°F7 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 26 mi24 min SE 14 G 18 56°F 56°F1018 hPa54°F
46237 - San Francisco Bar, CA (142) 28 mi64 min 53°F4 ft
FTPC1 - 9414290 - San Francisco, CA 37 mi58 min NNE 6 G 6 53°F 53°F1018.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi65 min Calm 53°F 1019 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 41 mi46 min ESE 2.9 G 4.1 53°F 1017.9 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 41 mi24 min E 14 G 18 54°F 55°F1017.9 hPa51°F
PXSC1 41 mi46 min 54°F 54°F
RCMC1 - 9414863 - Richmond, CA 43 mi46 min 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi52 min ENE 1.9 G 1.9 52°F 1018.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 44 mi46 min ENE 1 G 1.9
OBXC1 44 mi52 min 53°F 53°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 45 mi46 min ESE 2.9 G 4.1 54°F 1019.2 hPa
AAMC1 - 9414750 - Alameda, CA 46 mi46 min 53°F
LNDC1 47 mi52 min Calm G 1 53°F 1018.7 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA36 mi39 minSE 910.00 miOvercast57°F51°F82%1018.3 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrCalmNE10NE9S4SE4CalmNE4E7E3NE5CalmE5SE7S3CalmCalmCalmCalmCalmCalmCalmCalmE3SE9
1 day agoN6SE7NE6E7NE6N6W3CalmE4S3CalmNW3S5S7SE8CalmNE5CalmN5CalmNE5CalmNE6Calm
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SE12E7S5SE6CalmCalmCalmCalmN6CalmCalmCalmE7NE10E7E5--E3S7

Tide / Current Tables for Southeast Farallon Island, California
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Southeast Farallon Island
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Thu -- 12:43 AM PST     Moonset
Thu -- 06:22 AM PST     4.90 feet High Tide
Thu -- 07:11 AM PST     Sunrise
Thu -- 12:54 PM PST     2.09 feet Low Tide
Thu -- 01:40 PM PST     Moonrise
Thu -- 04:53 PM PST     Sunset
Thu -- 06:02 PM PST     3.68 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.52.233.94.54.94.84.53.93.22.62.22.12.32.73.13.53.73.63.22.621.6

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Thu -- 12:42 AM PST     Moonset
Thu -- 01:00 AM PST     0.00 knots Slack
Thu -- 04:11 AM PST     0.82 knots Max Flood
Thu -- 07:12 AM PST     Sunrise
Thu -- 07:18 AM PST     -0.00 knots Slack
Thu -- 09:59 AM PST     -0.74 knots Max Ebb
Thu -- 01:40 PM PST     Moonrise
Thu -- 01:57 PM PST     0.00 knots Slack
Thu -- 04:37 PM PST     0.55 knots Max Flood
Thu -- 04:52 PM PST     Sunset
Thu -- 07:17 PM PST     -0.00 knots Slack
Thu -- 09:58 PM PST     -0.77 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-00.40.70.80.80.60.1-0.3-0.6-0.7-0.7-0.6-0.300.30.50.50.40.1-0.3-0.7-0.8-0.7

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)
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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.