Friday, December4, 2020
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Marine Weather and Tides
Bethel Island, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:06AMSunset 4:48PM Friday December 4, 2020 3:21 PM PST (23:21 UTC) Moonrise 8:44PMMoonset 10:53AM Illumination 77% Phase: Waning Gibbous; Moon at 20 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 205 Pm Pst Fri Dec 4 2020
Today..NE winds up to 10 kt.
Tonight..N winds up to 10 kt.
Sat..E winds up to 10 kt.
Sat night..SW winds 5 to 10 kt.
Sun..W winds up to 10 kt.
Sun night..NW winds 5 to 15 kt.
Mon..NE winds 15 to 25 kt with gusts up to 30 kt.
Tue..NE winds around 5 kt.
PZZ500 205 Pm Pst Fri Dec 4 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate winds will continue through tonight while long period nw swell slowly subsides. An approaching front will cause the winds becoming southwest to westerly on Saturday before turning back from the north and increasing on Sunday. As winds ease and turn out of the ne Monday night into Tuesday, another long period large amplitude swell will move into the waters. This will cause large breaking waves across nearshore shoals.


7 Day Forecast for Marine Location Near Bethel Island, CA
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location: 38.01, -121.64     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 042139 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 139 PM PST Fri Dec 4 2020

SYNOPSIS. Mostly dry weather, above average high temperatures, and cool nights will continue. Slight chance of scattered showers in the mountains and northern Valley Saturday night through early Sunday. Gusty winds are possible Sunday and Monday which could lead to elevated fire weather concerns for some areas.

DISCUSSION. Visible satellite is showing mostly clear skies over interior NorCal early this afternoon other than a small band of high clouds over the north state. Mild weather continues this afternoon with temperatures similar to yesterday except the northern Sacramento Valley could see temperatures a few degrees warmer due to localized north winds.

A weak weather system is still on track to move through the area tomorrow through early Sunday. The main impacts are still forecast to remain outside of the forecast area. However, there still remains a chance precipitation along the Coastal Range Saturday night, with a scattered light shower or two possible over the northern Sacramento Valley, Shasta County mountains, and northern Sierra as the trough moves through early Sunday morning. Precipitation accumulation is forecast to be extremely light with flurries to less than an inch of snowfall for the higher elevations above 5000 to 6000 feet. This trough will also bring cooler temperatures to the northern Sacramento Valley for the weekend with temperatures around 5 to 10 degrees cooler tomorrow than today.

As the trough moves east on Sunday, ensemble guidance continues to indicate it will form into a closed low over Nevada later Sunday and then move southwest through California through Monday. This pattern will produce gusty north to east winds Sunday evening through Monday across northern California. Significant differences still remain between the models in the track and timing of the closed low which will ultimately impact how strong the winds become. Current forecast is for northerly Valley gusts up to 20 to 30 mph and north to east mountain and foothill gusts up to 25 to 40 mph, locally higher through favored gaps, canyons, and ridgetops. Gusty winds are expected to pick up Sunday, increasing Sunday night and early Monday, especially the downslope winds in the foothills. Winds will remain breezy through Monday before decreasing Monday night. These winds along with low daytime relative humidity and continued dry vegetation could result in elevated fire weather concerns during this period. -HEC

EXTENDED DISCUSSION (Tuesday THROUGH Friday). No major changes to the extended forecast. By Tuesday morning, the upper closed low will be located just west of the Baja Peninsula with broad ridging across Northern California, and calmer winds are expected. A shortwave passes over the Pacific Northwest Tuesday night into Wednesday, with another possible wave skimming across far northern California Thursday night into Friday. Any precipitation chances look to stay north of the area at this time, with the main impact being some possible offshore winds late week. Unseasonably mild high temperatures remain through Thursday, with highs anywhere from 5 to 15 degrees above normal for this time of year.

AVIATION. Generally expect VFR conditions across the Sacramento Valley over the next 24 hours. Could see some localized MVFR visibilities in the northern San Joaquin Valley near Stockton and Modesto overnight and into Saturday morning. Winds at terminals are forecast to remain below 12 knots.

STO WATCHES/WARNINGS/ADVISORIES. None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi52 min S 4.1 G 5.1 64°F 1022.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 21 mi52 min E 8 G 9.9 64°F 55°F1022 hPa
SFXC1 - San Francisco Bay Reserve, CA 24 mi97 min E 6
UPBC1 26 mi52 min E 6 G 8
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi52 min NE 4.1 G 5.1 62°F 55°F1022.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi52 min E 8.9 G 12 63°F 1021.8 hPa
LNDC1 37 mi52 min WSW 1.9 G 2.9 62°F 1022.2 hPa
AAMC1 - 9414750 - Alameda, CA 39 mi52 min W 1 G 1.9 61°F 55°F1022.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 39 mi52 min W 1.9 G 2.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 39 mi52 min W 2.9 G 2.9 55°F 1022.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi52 min WSW 4.1 G 5.1 61°F 1022.6 hPa
OBXC1 40 mi52 min 57°F 40°F
RCMC1 - 9414863 - Richmond, CA 41 mi52 min W 4.1 G 5.1 59°F 54°F1022.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 43 mi52 min NNW 1.9 G 1.9 57°F 1021.3 hPa
PXSC1 43 mi52 min 57°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 44 mi41 min NNW 5.1 62°F 1022 hPa
RTYC1 - 9414523 - Redwood City, CA 46 mi52 min N 2.9 G 4.1 64°F 56°F1022.6 hPa
FTPC1 - 9414290 - San Francisco, CA 46 mi52 min E 4.1 G 5.1 58°F 55°F1022.5 hPa

Wind History for Port Chicago, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA22 mi29 minNNE 410.00 miFair69°F30°F24%1020.8 hPa
Stockton, Stockton Metropolitan Airport, CA22 mi27 minWSW 410.00 miFair67°F35°F31%1022 hPa
Livermore, Livermore Municipal Airport, CA23 mi29 minENE 910.00 miFair66°F27°F23%1021.8 hPa
Fairfield / Travis Air Force Base, CA24 mi84 minENE 710.00 miFair71°F31°F23%1023 hPa

Link to 5 minute data for KSCK

Wind History from SCK (wind in knots)
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Last 24hrCalmW4W4NW5CalmNW3CalmW5CalmCalmW4W4NW4NW3SW4W4NW4CalmCalmNW5CalmCalmW3W4
1 day agoW5W5W3W3E3E3E4SE5E5SE4SE5E4E9E8E7CalmW3CalmCalmCalmSE63SW3Calm
2 days agoCalmSW3CalmSE4CalmNE3E3--CalmE3CalmE3CalmCalmCalmCalmCalmCalmW4W3CalmCalmCalmN4

Tide / Current Tables for Irish Landing, Sand Mound Slough, San Joaquin River, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Irish Landing
Click for Map
Fri -- 02:21 AM PST     -0.24 feet Low Tide
Fri -- 07:06 AM PST     Sunrise
Fri -- 09:15 AM PST     2.70 feet High Tide
Fri -- 10:52 AM PST     Moonset
Fri -- 01:52 PM PST     1.49 feet Low Tide
Fri -- 04:46 PM PST     Sunset
Fri -- 07:02 PM PST     3.61 feet High Tide
Fri -- 08:43 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.4-0-0.2-0.20.20.81.52.12.52.72.62.31.91.61.51.72.12.83.43.63.432.31.5

Tide / Current Tables for West Island Lt .5 mi SE, San Joaquin River, California Current
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West Island Lt .5 mi SE
Click for Map
Fri -- 02:40 AM PST     0.00 knots Slack
Fri -- 05:55 AM PST     0.37 knots Max Flood
Fri -- 07:07 AM PST     Sunrise
Fri -- 09:35 AM PST     -0.00 knots Slack
Fri -- 10:53 AM PST     Moonset
Fri -- 11:34 AM PST     -0.22 knots Max Ebb
Fri -- 01:51 PM PST     0.00 knots Slack
Fri -- 04:46 PM PST     0.37 knots Max Flood
Fri -- 04:47 PM PST     Sunset
Fri -- 07:06 PM PST     -0.00 knots Slack
Fri -- 08:44 PM PST     Moonrise
Fri -- 10:53 PM PST     -0.99 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.5-0.20.10.30.30.40.30.30.1-0.1-0.2-0.2-0.100.20.30.40.20-0.3-0.7-0.9-1

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
Ground Weather Radar Station Sacramento, CA
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weather_mapweather_map weather_map


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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.