Wednesday, January27, 2021
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Marine Weather and Tides
Plymouth, CA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:11AMSunset 5:21PM Wednesday January 27, 2021 6:57 PM PST (02:57 UTC) Moonrise 4:18PMMoonset 6:41AM 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- 202 Pm Pst Wed Jan 27 2021
This afternoon..SE winds 10 to 20 kt with gusts up to 35 kt. Showers.
Tonight..SE winds 15 to 25 kt with gusts up to 40 kt. Showers and a slight chance of Thunderstorms.
Thu..SW winds 15 to 25 kt with gusts up to 40 kt. Showers and a slight chance of Thunderstorms.
Thu night..SW winds up to 10 kt. Showers likely.
Fri..N winds around 5 kt.
Fri night..SW winds up to 10 kt. A chance of rain.
Sat..SE winds 5 to 15 kt. A chance of rain.
Sun..S winds 5 to 10 kt. Rain likely. Winds and wind waves higher in and near Thunderstorms.
PZZ500 202 Pm Pst Wed Jan 27 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... The atmospheric river jogged northward today and is currently focused over the southern waters including the big sur coast and Monterey bay. Local gale to storm force southerly winds and very steep fresh southerly seas are possible south of the atmospheric river. North of the front, winds have weakened significantly but remain breezy and out of the south. Winds north of the front will become breezy to gusty (up to 35kt) during the afternoon and into the evening. Isolated to scattered showers and Thunderstorms north of the front are expected today and may bring brief heavy rainfall, hail, erratic gusty winds, or generate waterspouts. Otherwise, a steep northwest swell will move through the waters today alongside the fresh wind driven seas.


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 272331 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 331 PM PST Wed Jan 27 2021

SYNOPSIS. A long duration, high impact winter storm will continue to impact the region through Friday. Periods of gusty winds, moderate to heavy rain and blizzard conditions over the Northern Sierra. Potential for burn scar impacts to the LNU Complex and SCU Complex burn scars.

DISCUSSION. The strong winter storm continues to bring weather impacts across interior Northern California through tomorrow night. The high winds from overnight decreased by the morning hours. Significant damage and widespread power outages were reported across the southern Sacramento Valley, northern San Joaquin Valley, and the mountains with the strong winds. Winds today remain gusty with gusts up to 25 to 35 mph, locally higher in the mountains. Snow also fell down to the valley floor in the northern Sacramento Valley. The city of Redding received anywhere from 1.5 inch of snow at the airport on the south side of town to 10 inches at the higher elevations in the city. Snow levels have risen to above 2500 to 3500 feet over the mountains today.

Precipitation became more showery this morning through early afternoon for much of the area as expected. Radar imagery shows the next wave of moderate to heavy precipitation is beginning to spread into the forecast area from the south as the upper trough begins to funnel atmospheric moisture north. Precipitation is expected to move north through the evening with the heaviest expected generally along and south of Interstate 80. Another inch to two inches of liquid precipitation is forecast in the Valley through tomorrow night with up to 3 to 4 inches in the foothills below 3000 feet. Although HREF suggests rain rates are likely to remain below debris flow criteria, there is still a chance of isolated periods of heavy rainfall that could fall over the LNU Complex and SCU Complex burn scars. Therefore, the Flash Flood Watch remains in effect through tomorrow afternoon.

Significant mountain snowfall is expected to continue with this next wave of moisture. An additional 3 to 6 feet, locally higher, of snow is forecast from western Plumas County and south. The southern Cascades, Coastal Range, and Shasta County mountains are forecast to receive about another additional foot of snow. The heaviest snow is also expected along and south of Interstate 80. The Blizzard Warning remains in effect for the Northern Sierra for elevations above 3000 feet. The Winter Storm Warning remains in effect for the remainder of the mountains and foothills.

Precipitation will begin to taper off by late tomorrow. Showers are expected to continue through Friday and linger through Saturday, especially for the mountains and foothills. -HEC

EXTENDED DISCUSSION (Sunday THROUGH Wednesday). Yet another storm is still on track for early next week. This is slightly slower than before with some precipitation starting Sunday night and the north then main push of energy sliding south Monday and Tuesday.

Looking at the strength of this system right now is for sure weaker then on going system. ECMWF Extreme Forecast values for QPF and snow much lower. Also NAEFS/ECMWF ensemble anomaly values also much lower. That being said it is nice storm that will bring beneficial moisture to the area again. Winds will be less and snow levels higher in the 3500 and above range.

Bulk of moisture with this next system should be out of the area late Tuesday night with a cool north flow over the area Wednesday which could bring some northerly winds. Rasch

AVIATION. Widespread IFR to LIFR conditions due to low cigs and moderate to heavy rainfall. Gusty southerly winds gusts 20 to 30 knots through 15z Thursday. LIFR conditions over the mountains due to snow.

STO WATCHES/WARNINGS/ADVISORIES. Winter Storm Warning until 2 AM PST Friday for Burney Basin / Eastern Shasta County-Motherlode-Mountains Southwestern Shasta County to Western Colusa County-Northeast Foothills/Sacramento Valley-Shasta Lake Area / Northern Shasta County-Western Plumas County/Lassen Park.

Blizzard Warning until 2 AM PST Friday for West Slope Northern Sierra Nevada.

Flash Flood Watch through Thursday afternoon for Northern San Joaquin Valley-Southern Sacramento Valley.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 66 mi73 min SSE 15 45°F 1007 hPa42°F
PCOC1 - 9415144 - Port Chicago, CA 70 mi64 min E 11 G 16 46°F 50°F1006 hPa
AAMC1 - 9414750 - Alameda, CA 92 mi64 min ESE 14 G 18 49°F 50°F1005.7 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sacramento Mather Airport, CA25 mi63 minE 8 G 165.00 miRain45°F43°F93%1007.4 hPa

Link to 5 minute data for KMHR

Wind History from MHR (wind in knots)
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1 day ago----CalmCalmCalm--------SE7E5SE7SE10SE7S10--S9
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2 days agoS7--SW8------------SE3S6SW4SW4SW6W3--NW10NW8
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NW10NW10N8E5SE6Calm

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Wed -- 02:15 AM PST     -0.07 feet Low Tide
Wed -- 06:44 AM PST     Moonset
Wed -- 07:12 AM PST     2.51 feet High Tide
Wed -- 07:15 AM PST     Sunrise
Wed -- 01:19 PM PST     1.01 feet Low Tide
Wed -- 04:20 PM PST     Moonrise
Wed -- 05:22 PM PST     Sunset
Wed -- 05:22 PM PST     3.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.1-0.10.10.71.52.22.52.42.21.81.41.211.11.82.73.33.33.12.72.21.61.1

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Wed -- 12:44 AM PST     -0.07 feet Low Tide
Wed -- 06:03 AM PST     2.51 feet High Tide
Wed -- 06:43 AM PST     Moonset
Wed -- 07:14 AM PST     Sunrise
Wed -- 11:49 AM PST     1.01 feet Low Tide
Wed -- 04:13 PM PST     3.35 feet High Tide
Wed -- 04:21 PM PST     Moonrise
Wed -- 05:23 PM PST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.10.311.72.32.52.42.11.71.31.111.42.12.93.33.332.621.40.90.5

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




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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.