Wednesday, December11, 2019
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Marine Weather and Tides
Plymouth, 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 7:10AMSunset 4:44PM Wednesday December 11, 2019 9:38 AM PST (17:38 UTC) Moonrise 4:37PMMoonset 6:31AM Illumination 100% Phase: Full Moon; Moon at 15 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- 858 Am Pst Wed Dec 11 2019
Today..SE winds up to 10 kt. A slight chance of showers.
Tonight..S winds 5 to 10 kt. A slight chance of rain.
Thu..S winds 5 to 15 kt. A slight chance of rain.
Thu night..SW winds up to 10 kt. A slight chance of rain.
Fri..N winds around 5 kt.
Fri night..SW winds 5 to 10 kt.
Sat..W winds 5 to 15 kt. A chance of rain.
Sun..NW winds up to 10 kt.
PZZ500 858 Am Pst Wed Dec 11 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Weak high pressure off the california coast extends across california into the great basin. Winds will be light southeast through Thursday night before switching to northwest. Large northwest swells with long periods will build on Thursday and continue through Saturday.


7 Day Forecast for Marine Location Near Plymouth, CA
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location: 38.48, -120.84     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 111137 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 337 AM PST Wed Dec 11 2019

SYNOPSIS. Light showers possible on Wednesday and Thursday. Widespread precipitation expected later in the week and into the weekend. Drier weather Sunday and early next week.

DISCUSSION. A weak weather system moved through NorCal last night spreading precipitation across the area. The upper level trough has moved east into Nevada with only lingering showers remaining early this morning. Areas of light fog have developed behind the frontal passage. Fog could become denser in areas this morning, though it will be dependent on high cloud cover.

Upper level flow expected to become more zonal over NorCal today. A shortwave along a deep trough centered around the Gulf of Alaska pushes into the West Coast today, bringing an increased chance of light precipitation to areas generally north of I-80 this afternoon. Increased precipitation is expected across most of the area overnight Wednesday into Thursday, tapering off significantly south of the Sacramento area. Heaviest precip amounts forecast in northern Shasta County and mountains north of I-80 with amounts up to 0.75 to 1 inch possible. Lighter amounts expected in the rest of the Valley with only a few hundredths south of Sacramento up to around a quarter of an inch in the northern Sacramento Valley. Snow levels will mainly be above 7000 to 8000 feet with minimal accumulation expected.

Ensembles continue to suggest precipitation chances continue Friday through Saturday as impulses move along the zonal flow. The majority of precipitation will remain in the foothills and mountains with precipitation amounts of half an inch to an inch and a quarter forecast. The Valley could see anywhere from a few hundredths of an inch to a quarter of an inch. Snow levels will begin to drop Friday to around 6000 to 7000 feet before dropping below pass level overnight Friday with light accumulation down to 4000 to 4500 feet possible. Snow accumulation around 5 to 10 inches is possible over the Sierra which could cause hazardous travel conditions over the Sierra passes. HEC

EXTENDED DISCUSSION (Sunday THROUGH Wednesday). To conclude the weekend, broad troughing will have shifted into the Four Corners which allows for heights to build over the region from Sunday into early next week. This supports a period of dry weather accompanied by mostly sunny skies and near average temperatures. From Tuesday onward, there is a greater amount of uncertainty in the offshore (upstream) pattern. Progressive flow will carry a longwave trough across the central Pacific this weekend with its fate dictating impacts over northern California. While 06Z GEFS/00Z ECMWF ensemble means show a trough entering the picture next Tuesday/Wednesday (December 17/18), deterministic guidance show the potential for a closed low to separate itself from the prevailing westerlies. Such solutions are wildly variable so confidence is low in the eventual outcome. However, did raise the chances for precipitation in the forecast due to the presence of the trough. ~BRO

AVIATION. Widespread MVFR/IFR conditions at TAF sites through 20z. -SHRA possible across Central Valley through 16z. Precipitation returns this afternoon with -RA possible after 23z. Light winds generally less than 10 kts expected.

STO WATCHES/WARNINGS/ADVISORIES. None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PCOC1 - 9415144 - Port Chicago, CA 70 mi50 min ENE 7 G 8.9 51°F 53°F1023.7 hPa
AAMC1 - 9414750 - Alameda, CA 92 mi50 min 55°F

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sacramento Mather Airport, CA25 mi53 minN 05.00 miFog/Mist52°F50°F94%1024 hPa

Link to 5 minute data for KMHR

Wind History from MHR (wind in knots)
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Last 24hrN4Calm--W4SW5------E5W5NW5E6E3SE3SW3SW4--E4E3CalmNE3--CalmCalm
1 day agoS4S5SE3Calm------Calm----SW3CalmE3SE5SE5----E6CalmE5CalmCalmCalmCalm
2 days agoS8S6E8E7SE4CalmCalm------------------------CalmE3E4E5S5

Tide / Current Tables for Clarksburg, Sacramento River, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Wed -- 12:47 AM PST     -0.10 feet Low Tide
Wed -- 05:56 AM PST     2.22 feet High Tide
Wed -- 06:34 AM PST     Moonset
Wed -- 07:13 AM PST     Sunrise
Wed -- 11:45 AM PST     0.77 feet Low Tide
Wed -- 04:24 PM PST     3.24 feet High Tide
Wed -- 04:40 PM PST     Moonrise
Wed -- 04:45 PM PST     Sunset
Wed -- 09:14 PM PST     Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.10.20.91.622.22.11.81.410.80.81.11.82.73.23.232.521.40.80.4

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 Sacramento, CA (12,3,4,5)
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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 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.