Wednesday, January27, 2021
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Marine Weather and Tides
Placerville, 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 5:40 AM PST (13:40 UTC) Moonrise 4:17PMMoonset 6:41AM Illumination 99% Phase: Full Moon; Moon at 14 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- 221 Am Pst Wed Jan 27 2021
.small craft advisory in effect until 9 am pst this morning...
Today..SE winds 5 to 15 kt with gusts up to 30 kt. Rain.
Tonight..S winds 10 to 20 kt with gusts up to 25 kt. Rain.
Thu..S winds 5 to 15 kt. Rain and a slight chance of Thunderstorms.
Thu night..E winds up to 10 kt. Rain likely.
Fri..NE winds up to 10 kt. A slight chance of rain.
Fri night..SW winds 5 to 10 kt. A chance of rain.
Sat..SE winds 5 to 10 kt. A chance of rain.
Sun..S winds 5 to 15 kt. Rain likely. Winds and wind waves higher in and near Thunderstorms.
PZZ500 221 Am 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 back edge of the atmospheric river boundary has passed south of the northern waters and is currently passing by pigeon point headed toward point sur. This system is producing heavy rain over the waters and the occasional lightning strike. The seas will remain hazardous through Wednesday even behind the front. For the southern waters, the winds ahead of this front will be strong and out of the south. These winds over the southern waters are expected to be gale to storm force strength through 17z (9 am pst). These winds will generate extremely steep fresh southerly seas through the morning mixed with a moderate northwest swell. Extreme caution is advised in this environment. Winds will diminish with breezy to locally gusty conditions in the wake of the front tomorrow, however the front will stall over point sur to keep strong wind gusts along the big sur coast.


7 Day Forecast for Marine Location Near Placerville, CA
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location: 38.73, -120.8     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 271115 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 315 AM PST Wed Jan 27 2021

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

DISCUSSION. Strong system going through the region continues to generate strong winds downed trees and power outages. Winds should be decreasing to lower levels between 6 and 8 am this morning but remain breezy during the day. So far the greatest measured wind gusts for the valley occurred at McClellan at 2:35 AM at 67 mph then Marysville at 1:10 AM in the morning measuring 66 mph. The peak at Alpine meadows has had 125 mph wind gust at 1:45 AM.

Low snow levels continue with snow showers over the north end of the valley. Further south in the Motherlode snow levels are near 2000 feet with major roads looking ok at that level this morning looking at the webcams. Generally around I-80 northward activity has changed over to showers while to the south we are still getting some moderate to heavy rainfall. Snow levels should rise enough later this morning to change the snow showers over to rain showers for the northern end of the valley. Over the foothills snow levels will rise above 3000 feet by noon.

As the low deepens off the coast the heavier rain will continue to push southward this morning but by late morning the front stalls and starts to move a little north. This may cause problems tonight over the SCU Complex Burn Scar as it stall out over the complex. Over the western slopes/foothills after areas generally around the US-50 north lighten up in intensity this afternoon rain/snow will spread northward increasing in intensity for rain/snowfall. The heavier area of rain/snow will continue to spread northward over foothills and mountains and eventually reach southwestern Shasta County late tonight. By Thursday night most areas will see a decrease in rain/showers with the West slopes of the Sierra Nevada decreasing in intensity last on Friday morning.

EXTENDED DISCUSSION (Sunday THROUGH Wednesday).

We will remain in an unsettled weather pattern into the extended period. A deep trough will be dropping out of the Gulf of Alaska on Sunday and will push over NorCal on Tuesday. This will bring showers starting during the day Sunday with the best chances on Monday as the cold front moves through the region. This system does not look as wet as our current system but it will be a wetter system with several inches of snow expected over the mountains and upwards of an inch or more of rain in the Valley and Foothills. Snow levels look to be around 5000 feet with this system. Showers will linger into Tuesday with dry weather returning Wednesday as upper level ridging builds in. High temperatures will be near to just below average throughout the period.

-CJM

AVIATION.

Widespread IFR to LIFR conditions due to low cigs. Heavy rain will bring low vis through 15z with continued low vis at times after that due to rain. For northern terminals snow will transition to rain after 15z. Strong southerly winds gusting to 55 knots through 14z with gusts to 35 knots after that. 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-Central Sacramento Valley-Motherlode- Mountains Southwestern Shasta County to Western Colusa County- Northeast Foothills/Sacramento Valley-Northern 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.

High Wind Warning until 8 AM PST this morning for Carquinez Strait and Delta-Central Sacramento Valley-Motherlode-Mountains Southwestern Shasta County to Western Colusa County-Northeast Foothills/Sacramento Valley-Northern Sacramento Valley-Northern San Joaquin Valley-Southern Sacramento Valley.

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




Weather Reporting Stations
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Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Auburn Municipal Airport, CA22 mi46 minS 18 G 313.00 miFog/Mist and Breezy39°F37°F93%1007.1 hPa

Link to 5 minute data for KAUN

Wind History from AUN (wind in knots)
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1 day agoW4CalmCalmE4SE3SE4SE4Calm3SE3S4SE4E4--E5E5SE4CalmE7E5CalmE5E6E5
2 days agoSE5SE4SE7SE8S9
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S9S9SW9S7S6S5S7S10SE8336CalmW3SW8W7

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.