Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Penn Valley, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:49AMSunset 5:50PM Wednesday February 20, 2019 1:16 PM PST (21:16 UTC) Moonrise 7:23PMMoonset 7:48AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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 201204
afdsto
area forecast discussion
national weather service sacramento ca
404 am pst Wed feb 20 2019

Synopsis
A weak, cold system moves through today into early Thursday with
light mountain and foothill snow. Breezy winds Thursday with dry
weather Friday. Light precipitation possible once again over the
weekend and early next week.

Discussion
Mid level clouds cover most of the forecast area this morning
ahead of a weak upper shortwave trough now over the northwest
corner of the state. Cloud cover bringing warmer temperatures
this morning with early morning temperatures anywhere from 4 to
10 degrees above 24 hours ago. Radar is showing some light
precipitation just west of shasta county and models spread light
precipitation southward across the forecast area today. Snow
levels with this cold system will be quite low at around 2000
feet. As a result, snow ratios will be relatively high at 15:1 or
more. Therefore, even fairly light precipitation will translate to
several inches of snowfall over the sierra so will leave up
winter weather advisory currently in place. Cooler airmass and
cloud cover will bring cooler MAX temperatures this afternoon.

Precipitation will drop off late tonight as a secondary trough
moves into socal. Main upper low forecast to move into the
southern great basin on Thursday. The sierra cascade crest may see
a few light showers under cyclonic flow but the remainder of the
forecast area should remain dry on Thursday with a little warming.

Northerly flow between upper low over southern great basin and
high pressure ridge over the eastern pacific will bring breezy
north winds Thursday afternoon and evening.

High pressure pushing in over the state will bring fair skies and
warmer temperatures on Friday. Mainly clear skies and lessoning
wind will allow morning lows Friday to cool again with near
freezing temperatures returning to the central valley. Still
should be enough wind around, however, to keep temperatures from
dropping to much below freezing. Mainly fair skies will continue
into Friday night but warming airmass should keep morning lows
Saturday elevated above Friday morning lows.

An upper trough digging out of the gulf of alaska and down the
west coast is forecast by models to start bringing precipitation
to the northern forecast area by Saturday afternoon. Forecast
models show fairly light precipitation dropping southward over
the region as the upper low shifts slowly southward. Forecast
models keep this trough of low pressure stretched out over the
pacific northwest going into early next week for a continued
threat of light precipitation with relatively low snow levels
remaining over the region.

.Extended discussion (Sunday through Wednesday)
a weak system moves through Sunday, bringing light valley
rainfall and a few inches of mountain snow. Snow levels should be
around 2000-3000 feet.

Models trending towards nearly stationary frontal boundary with
precipitation continuing into early next week and potentially
beyond. Confidence in details remains low for now. Will keep
unsettled pattern continuing through next week.

Aviation
GeneralVFR conditions with local MVFR CIGS through 18z, then -ra
spreading through the valley with areas of MVFR. Snow levels
around 015-025 ft amsl with ifr over mountains.

Sto watches warnings advisories
Winter weather advisory until 10 pm pst this evening 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 82 mi91 min WNW 8 55°F 1013 hPa37°F
PCOC1 - 9415144 - Port Chicago, CA 91 mi28 min W 16 G 20 52°F 49°F1011.7 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 mi41 minWSW 310.00 miOvercast36°F32°F87%1009.5 hPa
Marysville, Beale Air Force Base, CA14 mi78 minWSW 410.00 miMostly Cloudy51°F37°F60%1012.8 hPa
Auburn Municipal Airport, CA19 mi41 minSW 910.00 miOvercast46°F35°F66%1010.8 hPa
Marysville, Yuba County Airport, CA21 mi23 minN 010.00 miPartly Cloudy53°F39°F59%1011.8 hPa
Lincoln Regional Karl Harder Field, CA22 mi21 minWSW 810.00 miPartly Cloudy52°F35°F54%1011.5 hPa

Wind History from GOO (wind in knots)
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Last 24hrCalmW3SW5W3CalmCalmSE3SE5SE5SE6SE7SE5SE5S5CalmSE6SE4SE5SE5SE3SE7SE5CalmCalm
1 day agoNW5NE4N4N4N5NE6NE7E9NE5E5NE5NE4NE7NE6NE5E6NE4E4E6CalmCalmW5CalmW3
2 days agoNW4CalmW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW5

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Wed -- 03:13 AM PST     -0.18 feet Low Tide
Wed -- 06:50 AM PST     Sunrise
Wed -- 07:48 AM PST     Moonset
Wed -- 08:00 AM PST     2.85 feet High Tide
Wed -- 03:05 PM PST     0.49 feet Low Tide
Wed -- 05:49 PM PST     Sunset
Wed -- 07:22 PM PST     3.41 feet High Tide
Wed -- 07:24 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.40-0.200.81.82.62.92.72.41.91.40.90.60.50.81.72.83.43.43.12.62

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Wed -- 01:43 AM PST     -0.18 feet Low Tide
Wed -- 06:50 AM PST     Sunrise
Wed -- 06:51 AM PST     2.85 feet High Tide
Wed -- 07:47 AM PST     Moonset
Wed -- 01:35 PM PST     0.49 feet Low Tide
Wed -- 05:49 PM PST     Sunset
Wed -- 06:13 PM PST     3.41 feet High Tide
Wed -- 07:24 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.1-0.20.31.22.12.72.82.72.21.71.20.80.50.51.12.133.43.332.41.81.1

Weather Map and Satellite Images
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wmap_P
GOES 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sacramento, CA (16,3,4,5)
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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.