Thursday, April2, 2020
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Marine Weather and Tides
Penn Valley, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:47AMSunset 7:31PM Wednesday April 1, 2020 10:38 PM PDT (05:38 UTC) Moonrise 11:14AMMoonset 1:39AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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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7 Day Forecast for Marine Location Near Penn Valley, CA
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location: 39.21, -121.2     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 012155 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 255 PM PDT Wed Apr 1 2020

Synopsis. Dry and mild weather expected this week. Breezy north winds expected into Thursday. A pair of storms move in over the weekend into early next week bringing rain, gusty winds, accumulating mountain snow, and travel problems.

Discussion. Pacific ridging over the Pacific has slowly expanded eastward, resulting in the tightening of the pressure gradient. Dry and breezy conditions have resulted from this with the Valley currently reporting wind gusts between 20 and 30 mph. These conditions are expected to repeat again tomorrow; however, temperatures on Thursday and Friday will rise back to around normal levels.

A shortwave progresses towards the west coast Friday night, with precipitation chances beginning early Saturday morning north of I-80, then spreading southward. Exact timing of precipitation remains somewhat uncertain, with the ECMWF slower than the GFS, but ensembles and deterministic models agree by mid-afternoon that the possibility for precipitation will be widespread across the area. Snow levels are expected to be around 4000-5000 feet, with accumulating snow bringing potential travel problems through much of Sunday. Latest guidance suggests that the passes could see up to 1 to 2 feet of snow from Saturday morning through Monday morning. For the Valley and foothills, rainfall totals of 0.50 to 2 inches will be possible. EK/KR

EXTENDED DISCUSSION (Sunday THROUGH Wednesday). A pair of Pacific storms will move through interior NorCal, the first on Sat, followed by a colder/stronger low Sunday. The deterministic runs are in better agreement in the handling of the Sun system as it drops southward along the CA coast Sun/Mon. This follows the 5H Cluster Analysis of a deep trof/closed low off the CA coast Mon/Tue.

Widespread precipitation is expected over Norcal this weekend with Sun's system bringing periods of moderate to heavy snow to the Sierra/Wrn Plumas Co during the day and into the evening. Showers are likely over our CWA on Mon as the low skirts the coast just to our W, with residual showers on Tue as strong cyclonic flow lingers over the region. Snow levels generally will range from around 3500 to 4500 feet Sun/Mon, rising to 4500-5500 feet late Tue. There is uncertainty as to how far north the showers will extend into Norcal on Tue/Wed. The GFS is farther south than the ECM, and thus the precip may barely reach into our the Srn portions of the CWA, and is also faster moving the closed low across SOCAL, and is drier than the ECM.

A chilly/cold period is in store for Norcal with max temps some 10-15 degrees below normal on Sun, moderating to about a handful of degrees below normal on Tue, and continuing to moderate into Wed. JHM

AVIATION.

Mainly SKC conditions in the Vly thru 00z Fri with local Nly surface wind G25 kts until 01z Thu and again from 16z Thu-01z Fri. Over W Slope Sierra MVFR conditions with isolated SW-- (flurries) becoming SKC after 06z Thu. Local SW-W wind G35 kts and isolated G65 kts over highest peaks thru 18z Thu decreasing to G55 kts after 18z Thu.

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 82 mi53 min WNW 5.1
PCOC1 - 9415144 - Port Chicago, CA 91 mi50 min W 14 G 17 55°F 58°F1015 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nevada County Air Park, CA10 mi68 minN 010.00 miFair39°F17°F42%1014.6 hPa
Marysville, Beale Air Force Base, CA14 mi40 minESE 410.00 miFair48°F30°F50%1014.9 hPa
Auburn Municipal Airport, CA19 mi43 minN 010.00 miFair41°F23°F49%1014.9 hPa
Marysville, Yuba County Airport, CA21 mi45 minNNW 510.00 miFair51°F21°F32%1015.4 hPa
Lincoln Regional Karl Harder Field, CA22 mi43 minNE 510.00 miFair37°F32°F81%1014.6 hPa

Link to 5 minute data for KGOO

Wind History from GOO (wind in knots)
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Tide / Current Tables for Sacramento, 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 Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Thu -- 03:30 AM PDT     Moonset
Thu -- 04:07 AM PDT     2.16 feet High Tide
Thu -- 06:48 AM PDT     Sunrise
Thu -- 10:03 AM PDT     0.93 feet Low Tide
Thu -- 01:19 PM PDT     Moonrise
Thu -- 02:00 PM PDT     2.68 feet High Tide
Thu -- 07:31 PM PDT     Sunset
Thu -- 11:45 PM PDT     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.91.51.92.22.11.81.51.210.91.11.72.42.72.62.42.11.71.20.80.50.20.1

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 (1,6,7,8)
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Ground Weather Radar Station Beal AFB, 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 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.