Friday, December6, 2019
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Marine Weather and Tides
Broadmoor, 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 7:09AMSunset 4:52PM Friday December 6, 2019 8:21 AM PST (16:21 UTC) Moonrise 2:05PMMoonset 1:37AM Illumination 73% 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- 250 Am Pst Fri Dec 6 2019
.small craft advisory in effect through this afternoon...
.gale warning in effect from this afternoon through late tonight...
Today..SE winds 15 to 25 kt, becoming S 25 to 30 kt this afternoon. Gusts up to 40 kt. Wind waves 7 to 8 ft, increasing to 9 to 10 ft this afternoon. W swell 3 to 5 ft at 17 seconds, increasing to 5 to 7 ft at 17 seconds this afternoon. A chance of rain.
Tonight..S winds 25 to 35 kt with gusts up to 50 kt. Wind waves 9 to 11 ft. W swell 6 to 8 ft at 17 seconds. Rain.
Sat..S winds 25 to 30 kt with gusts up to 40 kt. Wind waves 7 to 8 ft. W swell 7 to 9 ft at 14 seconds. Rain and a slight chance of Thunderstorms.
Sat night..SW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 8 to 10 ft at 12 seconds. Rain.
Sun..W winds 10 to 15 kt. Wind waves 3 to 4 ft. W swell 6 to 8 ft at 12 seconds. A chance of rain.
Sun night..N winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 4 to 6 ft at 11 seconds.
Mon..N winds up to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft and sw around 2 ft.
Tue..NE winds around 5 kt. Wind waves 1 ft. W swell 4 to 6 ft and S around 2 ft. Winds and wind waves higher in and near Thunderstorms.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 13 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 13 seconds. Maximum ebb current of 2.0 kt at 12:37 pm Friday and 1.3 kt at 12:31 am Saturday.
PZZ500 250 Am Pst Fri Dec 6 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 985 mb low centered 600 miles west of cape blanco will move east towards the northern california coast by Saturday night. This will bring another round of gusty southerly winds to the coastal waters with gale force winds developing today and persisting through tonight. These winds will generate large wind waves and hazardous seas. Moderate west swell will gradually build to around 10 to 12 feet tonight and continue through Saturday night. Showers and isolated Thunderstorms will be possible this evening through Saturday.


7 Day Forecast for Marine Location Near Broadmoor, CA
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location: 37.74, -122.59     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 061205 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 405 AM PST Fri Dec 6 2019

SYNOPSIS. Southerly winds will continue to increase today ahead of an incoming cold front. Rain will develop across the North Bay this afternoon and then spread southward tonight. Showery and cool on Saturday with isolated thunderstorms possible. Lingering showers on Sunday but trending drier by afternoon. Dry weather returns Monday and Tuesday with a slight chance of rain by midweek.

DISCUSSION. as of 2:55 AM PST Friday . Well defined surface cold front and upper low show up clearly on satellite early this morning. The cold core low is slightly out of phase with the surface cold front and the main rains will be slightly delayed. The morning impacts will include some pockets of dense fog, especially interior valleys with places like Concord currently reporting 1/2 mile fog. The southerly winds will increase through the day as the front approaches. We are already seeing sustained 17 mph southeast winds at Salinas as winds drain out of the Salinas Valley and up towards the center of the low circulation. Southeast winds are picking up at the coastal buoys as well, a sure sign of a classic winter time cold frontal passage.

Good news is the morning commute should remain dry. Frontal rains will reach the Sonoma coast by early afternoon bringing steady rains to the region. Rain will become more widespread along the coast but the heavier rains now look to hold off until the evening hours for the bulk of the Bay Area and Central Coast. Despite decent cold advection the surface front will lose some of its identity as it passes from north to south. Scenario is now looking like a more run of the mill Bay Area cold frontal passage where the North Bay, Santa Cruz mtns and Santa Lucia hills along the Big Sur coast will see impressive rainfall totals but many of the interior valleys will remain much drier. Updated qpf forecasts wont show much change but the overall trend looks slightly drier. Will say the 00z nam came in very wet but since then the 00/06z gfs and 00z ecmwf were drier and now more in line with the 06z nam model. Latest graphics will still show some 3-4 inch maxes for the North Bay hills with 1.5-3 inches for the Santa Cruz/Santa Lucia mtns. Rain shadowed Santa Clara/Salinas Valleys 0.25-0.50 on average with 0.50-1.00 inch elsewhere when all is said and done.

The Flash Flood watch for the Kincade burn area still looks valid with all models showing a bullseye of qpf in that area and the front strongest as it moves through northern Sonoma county this evening. Will need to monitor any convective lines and short term rain rates that could lead to problems over the burn area. The 00z nam was coming up with big qpf numbers as it tried to focus a secondary boundary over the Sonoma hills but that feature isn't showing up on the 06z runs.

Saturday looks cool and showery with isolated thunderstorms certainly possible. Fairly steep lapse rates and cooling aloft will likely mean small hail would be the biggest threat with any storms on Saturday.

Shower activity lingers into Sunday as the main upper low finally rotates over the region but Sunday looks drier and less active than Saturday for any outdoor plans.

Dry weather returns Monday and Tuesday with seasonable temperatures as high pressure rebuilds. A weak front may try and knock into the ridge by Weds with a slight chance of rain but not expecting anything of significance at this time.

Getting some mixed signals in the extended. Not seeing much chance of strong storms next week but by mid December the PNA may trend negative with the MJO trying to stay organized out in phase 3/4 which correlates with wetter than normal for December.

AVIATION. as of 04:05 AM PST Friday . For 12z TAFs. Low level clouds have decreased slightly as the next storm system approaches with most terminals now reporting VFR conditions. As the front approaches later today expect low level clouds to increase once again with borderline MVFR/VFR conditions. Scattered light rain showers will be possible much of the day across the North Bay ahead of the front. The main front and band of rainfall looks to arrive from north to south from 00-06z this evening. Mainly light rain is expected but periods of moderate rain are possible, heaviest in the North Bay. Southeast winds will increase today ahead of the front and become gusty this afternoon and evening. Possible LLWS today as well as southeast winds will approach 45-50 kt at 2000 feet AGL this evening.

Vicinity of KSFO . SCT/BKN clouds with bases around 3000-4000 feet this morning will gradually lower to around 2500 feet late this afternoon as a cold front approaches. Southeast winds will increase this morning and become stronger through the afternoon. Winds by 15z will gust to around 15 kt and increase to 25-30 kt this afternoon. Gusts up to 35 kt are possible this evening. Expecting the front and rain to arrive 00-03z with light to possible periods of moderate rain. LLWS will be a concern through the day as winds aloft increase more than the surface winds.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Cigs remaining in the VFR range this morning. Clouds with bases 3000-5000 feet will gradually increase today ahead of a cold front. The front will bring rain showers to the terminals this evening and overnight. Southeast winds will increase through the day, strongest at KSNS where gusts to near 30 kt are likely this afternoon and 30-35 kt this evening.

MARINE. as of 02:50 AM PST Friday . A 985 mb low centered 600 miles west of Cape Blanco will move east towards the northern California coast by Saturday night. This will bring another round of gusty southerly winds to the coastal waters with gale force winds developing today and persisting through tonight. These winds will generate large wind waves and hazardous seas. Moderate west swell will gradually build to around 10 to 12 feet tonight and continue through Saturday night. Showers and isolated thunderstorms will be possible this evening through Saturday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Wind Advisory . CAZ006-505>513-516>518-528>530 Flash Flood Watch . CAZ506-507 SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 PM GLW . SF Bay from 3 PM GLW . Pt Reyes to Pigeon Pt 0-10 nm from 3 PM GLW . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM GLW . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 3 PM GLW . Pt Arena to Pt Reyes 0-10 nm GLW . Pt Arena to Pigeon Pt 10-60 nm SCA . Mry Bay from 3 PM SCA . SF Bay from 7 AM until 3 PM



PUBLIC FORECAST: RWW AVIATION: ST MARINE: ST

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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) 4 mi52 min 53°F5 ft
FTPC1 - 9414290 - San Francisco, CA 8 mi58 min S 2.9 G 5.1 56°F 53°F1017 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi58 min SSE 5.1 G 9.9 57°F 1015.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 13 mi41 min SSE 7 56°F 1017 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 13 mi22 min SE 19 G 25 57°F 54°F1016.1 hPa (-0.5)
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi52 min SSW 2.9 G 4.1 55°F 1016.8 hPa
OBXC1 14 mi52 min 56°F 55°F
AAMC1 - 9414750 - Alameda, CA 16 mi52 min 53°F
RCMC1 - 9414863 - Richmond, CA 16 mi52 min 54°F
LNDC1 17 mi52 min SE 8 G 9.9 58°F 1016.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi58 min S 8.9 G 11 57°F 1017.1 hPa
RTYC1 - 9414523 - Redwood City, CA 26 mi52 min ESE 5.1 G 8 58°F 55°F1017.5 hPa
PRYC1 - 9415020 - Point Reyes, CA 27 mi52 min 54°F1015.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 28 mi58 min ESE 12 G 14 53°F 1016.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi32 min SE 21 G 27 58°F 56°F6 ft1015.6 hPa54°F
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi52 min ENE 4.1 G 6 51°F 53°F1017.6 hPa51°F
UPBC1 32 mi58 min E 7 G 8
PCOC1 - 9415144 - Port Chicago, CA 36 mi52 min ENE 7 G 8 51°F 53°F1017.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi52 min E 4.1 G 5.1 51°F 1017.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 44 mi97 min ENE 2.9 53°F 1018 hPa
46214 - Point Reyes, CA (029) 48 mi22 min 56°F8 ft

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, CA15 mi26 minESE 710.00 miMostly Cloudy55°F51°F87%1016.5 hPa
Half Moon Bay Airport, CA17 mi27 minSSE 810.00 miA Few Clouds57°F50°F77%1016.6 hPa
Oakland, Metro Oakland International Airport, CA20 mi29 minSE 910.00 miMostly Cloudy59°F50°F72%1017 hPa
San Carlos Airport, CA23 mi29 minESE 710.00 miMostly Cloudy57°F50°F77%1016.9 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrNE7E5NE3NE5CalmCalmSW3CalmN9N7N5N4CalmCalmCalmE6CalmNE3SE3CalmCalmCalmCalmSE7
1 day agoNE6NE5NE5NE7NE3CalmN3S3NE5CalmCalmE3CalmCalmCalmCalmCalmNE3E3SW3E3SE3E4SE4
2 days agoSE7SE7SE6SE8E5E4CalmCalmCalmCalmCalmCalmCalmCalmSE9SE5NW3CalmCalmN10N6N5NE7NE10

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Fri -- 12:03 AM PST     1.31 feet Low Tide
Fri -- 01:37 AM PST     Moonset
Fri -- 06:59 AM PST     5.19 feet High Tide
Fri -- 07:11 AM PST     Sunrise
Fri -- 01:29 PM PST     1.56 feet Low Tide
Fri -- 02:04 PM PST     Moonrise
Fri -- 04:51 PM PST     Sunset
Fri -- 07:18 PM PST     3.80 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.522.83.64.455.254.43.52.721.61.61.92.533.53.83.73.42.82.2

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Fri -- 01:30 AM PST     0.01 knots Slack
Fri -- 01:37 AM PST     Moonset
Fri -- 04:38 AM PST     1.08 knots Max Flood
Fri -- 07:11 AM PST     Sunrise
Fri -- 08:04 AM PST     -0.00 knots Slack
Fri -- 10:48 AM PST     -1.16 knots Max Ebb
Fri -- 02:04 PM PST     Moonrise
Fri -- 02:29 PM PST     0.01 knots Slack
Fri -- 04:51 PM PST     Sunset
Fri -- 05:18 PM PST     0.87 knots Max Flood
Fri -- 08:27 PM PST     -0.00 knots Slack
Fri -- 10:54 PM PST     -0.98 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.30.30.811.10.90.60-0.6-1.1-1.2-1-0.8-0.30.30.70.90.80.60.2-0.3-0.8-1

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 (11,2,3,4)
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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.