Sunday, January21, 2018 L-36.com


Marine Weather and Tides
Penn Valley, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:18AMSunset 5:16PM Sunday January 21, 2018 4:55 AM PST (12:55 UTC) Moonrise 10:01AMMoonset 9:51PM Illumination 23% Phase: Waxing Crescent; Moon at 5 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 211152
afdsto
area forecast discussion
national weather service sacramento ca
352 am pst Sun jan 21 2018

Synopsis
Pacific storm moves through Sunday into Monday followed by
another midweek into Friday bringing periods of rain, mountain
snow, and gusty wind.

Discussion
Main forecast concerns for the short term period include a series
of winter storms that will bring rain and mountain snow to
northern california.

Water vapor and model upper level analysis from the early morning
show upper level trough off the west coast of canad a with
shortwave ridge of high pressure extending into the inner mountain
west of the conus. Moisture streaming in between the two upper
features increased high level cloud cover early this morning,
including the next storm system arrival.

Latest short term model guidance varies in precipitation amounts
with the incoming storm system, however the main storm track is
consistent with the brunt of the system passing to the north of
the forecast area under westerly flow at the upper levels. Model
height falls are subtle between 850 and 500 mb with the main
vorticity spin remaining north of the forecast area. Latest model
guidance has trended downward in precipitation amounts for the
mountains, however still expecting up to 3 inches for the i-5
corridor and up to 9 inches for the higher northern mountains of
shasta county. Snow levels will fall to 2000 feet, but the main
snow accumulations will happen at greater than 3000 feet.

Elsewhere, the valley can expect between 0.25 and 0.75 inches of
rain. The sierra is expecting light snow accumulations above 3000
feet north of i-80, but donner pass is not expecting heavier
amounts of snow due to the northerly trajectory of the upper
disturbance.

Another brief break is expected on Tuesday with a transition to a
shortwave ridge before the next weather system approaches
northern california. Early projections indicate heavier snow
between one and two feet for the sierra for Wednesday into
Thursday with widespread chances for rainfall across the valley up
to an inch.

.Extended discussion (Thursday through Sunday)
models shift pacific frontal band south and east of the CWA after
12z Thursday with upper trough shifting through the pacific
northwest and northern california during the day on Thursday.

Shortwaves pivoting through the trough will bring periods of
showers through the day Thursday. Cold air filtering in behind the
front will bring down snow levels down to some of the lowest
elevations of the season. Snow levels over shasta county will drop
to around 2000 feet with snow levels around 3000 feet over the
northern sierra nevada. Showers will continue over the cwa
Thursday night before lifting northward on Friday as high pressure
amplifies over the west coast. Daytime temperatures will come in
below normal on Thursday warming to near normal on Friday as areas
south of the northern mountains begin to clear. The shower threat
continues to shift northward on Saturday with daytime
temperatures warming to a little above normal. Upper ridge
amplifies still further by next Sunday bringing dry conditions,
clearing skies and above normal temperatures.

Aviation
MainlyVFR conditions this morning except areas MVFR in light fog
southern sacramento and northern san joaquin valleys and delta
through about 18z. Frontal band will bring rain over the northern
sacramento after about 20z with MVFR ceilings after about 02z.

MVFR conditions shifting southward to ksac by 05z. South wind
gusts 15 to 20 knots after about 18z.

Sto watches warnings advisories
Winter weather advisory from 2 pm this afternoon to 4 pm pst
Monday for mountains southwestern shasta county to northern lake
county-shasta lake area northern shasta county-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 82 mi71 min WNW 1 37°F 1025 hPa37°F
PCOC1 - 9415144 - Port Chicago, CA 91 mi38 min S 8 G 11 40°F 51°F1025.6 hPa

Wind History for Port Chicago, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nevada County Air Park, CA10 mi56 minE 310.00 miFair34°F17°F51%1023.7 hPa
Marysville, Beale Air Force Base, CA14 mi2 hrsN 010.00 miFair35°F32°F89%1025.4 hPa
Auburn Municipal Airport, CA19 mi61 minE 710.00 miFair37°F30°F75%1024.7 hPa
Marysville, Yuba County Airport, CA21 mi63 minN 010.00 miFair33°F30°F89%1026.4 hPa
Lincoln Regional Karl Harder Field, CA22 mi61 minE 610.00 miFair0°F0°F%1025.4 hPa

Wind History from GOO (wind in knots)
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Last 24hrCalmNE4NE3CalmE3CalmW3NW3NW9NW7W6NW6NW5N3CalmCalmCalmSE4CalmCalmCalmE3CalmE3
1 day agoS5S4SE3SE3SE5S3S4CalmW3CalmW7NW3NW5N4N3E6CalmCalmCalmCalmE4CalmN3NE3
2 days agoSE5SE5SE4S3S5S6SE5SE5S6S7SE5S5SW9
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SW7S3SW5SW6SW5CalmS3

Tide / Current Tables for Sacramento, Sacramento River, California
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Sacramento
Click for MapNote: These data apply only during low river stages.

Sun -- 05:04 AM PST     0.01 feet Low Tide
Sun -- 07:19 AM PST     Sunrise
Sun -- 10:01 AM PST     Moonrise
Sun -- 10:17 AM PST     2.57 feet High Tide
Sun -- 05:15 PM PST     Sunset
Sun -- 05:25 PM PST     0.69 feet Low Tide
Sun -- 09:20 PM PST     2.68 feet High Tide
Sun -- 09:52 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.30.80.40.100.20.81.62.32.62.52.321.51.10.80.70.81.32.12.62.62.4

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Sun -- 05:04 AM PST     0.01 feet Low Tide
Sun -- 07:19 AM PST     Sunrise
Sun -- 10:01 AM PST     Moonrise
Sun -- 10:17 AM PST     2.56 feet High Tide
Sun -- 05:15 PM PST     Sunset
Sun -- 05:25 PM PST     0.68 feet Low Tide
Sun -- 09:19 PM PST     2.67 feet High Tide
Sun -- 09:52 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.30.80.40.100.20.81.62.32.52.52.321.51.10.80.70.81.32.12.62.62.4

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Sacramento, CA (7,2,3,4)
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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 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.