Monday, December16, 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 7:13AMSunset 4:45PM Monday December 16, 2019 6:05 AM PST (14:05 UTC) Moonrise 9:42PMMoonset 11:06AM 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- 235 Am Pst Mon Dec 16 2019
Today..NE winds 5 to 15 kt.
Tonight..E winds 5 to 15 kt with gusts up to 25 kt.
Tue..E winds 10 to 20 kt with gusts up to 25 kt.
Tue night..NE winds 10 to 20 kt with gusts up to 25 kt. A chance of rain.
Wed..NE winds 5 to 15 kt. A chance of rain.
Wed night..E winds up to 10 kt.
Thu..SE winds up to 10 kt.
Fri..SE winds 5 to 10 kt.
PZZ500 235 Am Pst Mon Dec 16 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds remain light and out of the north, with a few locally breezy conditions. By late afternoon, the winds will switch around to the south and become gusty prior to the next weather system that is moving toward the san francisco bay area. Tuesday night into Wednesday morning, showers return to the coastal waters. The moderate northwest swell will continue to subside Monday and into Tuesday. The northwest swell will then rebuild overnight Tuesday as the system moves through.


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 161055 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 255 AM PST Mon Dec 16 2019

SYNOPSIS. Dry weather will continue with cold mornings through Tuesday. A weak system moves through mid-week with precipitation chances increasing by the weekend.

DISCUSSION. A few high clouds are spilling through the amplifying eastern Pacific ridge into NorCal, otherwise skies are clear early this morning. Temps are chilly with most areas running colder compared to 24 hours ago. Current readings range from around 10 in the colder mountain valleys to the lower 40s across milder portions of the Central Valley.

Dry weather will continue the next couple of days as the short- wave ridge moves overhead. Highs will be close to average for mid-December while overnight lows will be slightly below average. Colder portions of the Central Valley will dip down to around the freezing mark by early Tuesday morning.

The next upstream trough is forecast to split with the southern portion moving into central California Tuesday night into Wednesday. We'll likely see some scattered showers with light QPF across the region, but both the GEFS and EC ensembles indicate better potential to our south.

Focus of precipitation is then expected to shift back into the northern mountains and northern Sacramento Valley on Thursday as warm-advection and moist west-southwest flow returns. The southern half of the Sacramento Valley and northern Sierra south of I-80 will likely remain dry.

EXTENDED DISCUSSION (Friday THROUGH Monday). Except for some possible light showers over the northern mountains, dry weather will prevail on Friday. Then, widespread precipitation could return next weekend as upper troughing develops. However, model differences are evident regarding timing/QPF amounts. Precipitation may spread into the region as early as Saturday afternoon over the Coastal Range, and gradually spread southward overnight. Ensemble guidance suggests moderate to elevated probabilities of total QPF > 1", mainly north of I-80. Snow levels are expected to be around 5000-6500 feet Saturday, and are expected to fall to around 4500-5000 feet Sunday. This system could lead to travel difficulties over the mountains, especially since it is the pre-holiday weekend. Precipitation chances could linger into early next week.

AVIATION. VFR conditions next 24 hours, except local MVFR/IFR conditions from KMYV southward thru 18Z. Winds generally below 10 knots.

STO WATCHES/WARNINGS/ADVISORIES. None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 66 mi81 min NW 1.9 33°F 1027 hPa33°F
PCOC1 - 9415144 - Port Chicago, CA 70 mi48 min 53°F
AAMC1 - 9414750 - Alameda, CA 92 mi48 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 mi21 minN 00.15 miFog32°F32°F100%1026.7 hPa

Link to 5 minute data for KMHR

Wind History from MHR (wind in knots)
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Last 24hrCalmCalmS3S3W3NW3--W8N8NW6NW5------N5CalmCalm----------CalmCalm
1 day agoS6SE5E6SE6S6S4SW3S5SE3--S7S12SW9SW9SW13SW7S6S4--------CalmCalm
2 days agoS5S7S7SE6S5S9S12S8SE5SE8SE6S6S4S3S7S6S7S8----S6SE5SE5SE6

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Mon -- 05:42 AM PST     -0.23 feet Low Tide
Mon -- 07:17 AM PST     Sunrise
Mon -- 11:04 AM PST     2.38 feet High Tide
Mon -- 11:08 AM PST     Moonset
Mon -- 04:46 PM PST     Sunset
Mon -- 05:31 PM PST     0.76 feet Low Tide
Mon -- 09:23 PM PST     2.93 feet High Tide
Mon -- 09:43 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.40.80.30-0.2-0.20.10.91.62.22.42.321.61.310.80.81.42.32.92.92.7

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Mon -- 04:12 AM PST     -0.23 feet Low Tide
Mon -- 07:16 AM PST     Sunrise
Mon -- 09:55 AM PST     2.38 feet High Tide
Mon -- 11:07 AM PST     Moonset
Mon -- 04:01 PM PST     0.76 feet Low Tide
Mon -- 04:46 PM PST     Sunset
Mon -- 08:14 PM PST     2.93 feet High Tide
Mon -- 09:44 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.60.2-0.1-0.2-0.10.41.11.82.22.42.21.91.51.10.90.811.72.52.92.92.62.2

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 (9,2,3,4)
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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.