Friday, December13, 2019
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Marine Weather and Tides
Placerville, 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 7:11AMSunset 4:44PM Friday December 13, 2019 6:58 PM PST (02:58 UTC) Moonrise 6:20PMMoonset 8:37AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 256 Pm Pst Fri Dec 13 2019
Tonight..W winds 10 to 20 kt. Rain likely this evening. A slight chance of rain.
Sat..W winds 10 to 15 kt.
Sat night..W winds 10 to 20 kt with gusts up to 25 kt. A slight chance of rain.
Sun..NW winds up to 10 kt.
Sun night..NW winds up to 10 kt.
Mon..NE winds up to 10 kt.
Mon night..NE winds 5 to 10 kt.
Tue..E winds 5 to 10 kt. A chance of rain.
Wed..E winds 5 to 10 kt. A chance of rain.
PZZ500 256 Pm Pst Fri Dec 13 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak trough and cold front will drift through the coastal waters tonight. Southerly winds will switch to southwesterly this evening and then northwest overnight tonight through Saturday. Rain will fall across the waters today with showers lingering through Saturday. Winds are expected to increase and become breezy on Saturday. A large long- period northwest swell will impact the waters through Saturday.


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 132231 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 231 PM PST Fri Dec 13 2019


SYNOPSIS. Light valley rain and moderate mountain snow through Saturday night, Mountain travel delays are likely. Drier weather Sunday and early next week.

DISCUSSION. A relatively warm and moist system will continue passing through northern California into Saturday. Main precipitation band will move through late this afternoon/early evening. Snow levels are fairly high currently above 6500 feet, but will gradually lower to near 4000 feet by Saturday night. Valley rainfall amounts will be light generally under 0.25 inches, except 0.50-1.00 inches northern Sacramento Valley(Redding area), a bit more impressive amounts over the mountains and foothills from 1-2 inches of liquid. Snow amounts of 10 to 15 inches, locally 2 feet will be possible above 6500 feet, especially near pass level. A brief break in the showers will be possible Saturday afternoon, a second colder, but drier system will drop through Saturday night. Not much moisture with this system and conditions will remain dry for the Valley, 2 to 4 inches of additional snow will be possible above 4000 feet. Dry weather returns Sunday into early next week, as high pressure ridging builds over NorCal.

EXTENDED DISCUSSION (Tuesday THROUGH Friday).

The brief dry trend from the weekend will continue into early next week. On Tuesday, the transitory ridge to likely shift over toward the Central Great Basin ahead of a compact upper low nearing the California coast. Given the complex of nature of this system separating from the westerlies and eventually closing off, uncertainty still plagues the forecast. While the GFS/ECMWF ensembles agree on the existence of this system, they continue to exhibit spatio-temporal differences. The former model suite remains the wetter solution with widespread precipitation entering the picture by mid-week. On the contrary, The ECMWF ensemble system takes a more southern track favoring impacts down in southern California. There is enough ensemble spread to keep either scenario in play so will continue maintaining precipitation in the forecast. Expect increasing cloud cover given the influx of Pacific moisture with near average temperatures for mid-December.

Looking toward the following weekend, there are still fairly strong signals of wet weather in response to a full-latitude trough approaching the Pacific coast. While some of the 24-hour probabilities for 0.50 and 1.00 inches of precipitation have come down a bit, this will continue to be watched. The Climate Prediction Center experimental Day 8-14 hazards supports this notion with Dec 20-22 being highlighted for heavy precipitation which includes snow in the mountains. ~BRO

AVIATION.

Areas of MVFR with local IFR/LIFR conditions next 24 hours. Valley precipitation ends after 06z-08z Sat, then improving conditions in the Central Valley after 18z- 20z Saturday. Snow levels 6500 feet tonight, lowering to 4000 feet Saturday night. Light winds generally less than 12 kts at TAF sites.

STO WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory until 4 AM PST Sunday for West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 75 mi73 min W 5.1 56°F 1019 hPa51°F
PCOC1 - 9415144 - Port Chicago, CA 81 mi64 min W 1.9 G 2.9 57°F 54°F1018.7 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Auburn Municipal Airport, CA22 mi83 minS 810.00 miOvercast52°F50°F94%1018.6 hPa

Link to 5 minute data for KAUN

Wind History from AUN (wind in knots)
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Last 24hrE3E3E4E4CalmE4E6E4E3CalmCalmCalmCalmCalmS5S3S5SE6S7
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1 day agoE10SE7CalmCalmSE8SE9SE10SE7SE6SE3SE4SE6S5SE7S8S4S5S7S5SE6SE5SE6SE3Calm
2 days agoW4CalmE7E11E8CalmCalmE3CalmCalmCalmCalmE3E3E6CalmCalmCalmE6E3SE4SE7E8SE10

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Fri -- 03:37 AM PST     -0.18 feet Low Tide
Fri -- 07:15 AM PST     Sunrise
Fri -- 08:39 AM PST     Moonset
Fri -- 08:41 AM PST     2.33 feet High Tide
Fri -- 02:46 PM PST     0.86 feet Low Tide
Fri -- 04:45 PM PST     Sunset
Fri -- 06:23 PM PST     Moonrise
Fri -- 06:51 PM PST     3.34 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.40-0.1-0.10.311.82.22.32.11.81.41.10.90.91.32.23.13.33.22.82.31.7

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Fri -- 02:07 AM PST     -0.18 feet Low Tide
Fri -- 07:14 AM PST     Sunrise
Fri -- 07:32 AM PST     2.33 feet High Tide
Fri -- 08:38 AM PST     Moonset
Fri -- 01:16 PM PST     0.86 feet Low Tide
Fri -- 04:45 PM PST     Sunset
Fri -- 05:42 PM PST     3.34 feet High Tide
Fri -- 06:24 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.1-0.2-00.61.31.92.32.32.11.71.310.911.52.53.23.33.12.72.21.50.9

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 (21,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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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.