Wednesday, November14, 2018 L-36.com


Marine Weather and Tides
South Lake Tahoe, 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 6:41AMSunset 4:47PM Wednesday November 14, 2018 8:15 AM PST (16:15 UTC) Moonrise 12:33PMMoonset 10:55PM Illumination 41% Phase: Waxing Crescent; Moon at 7 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 South Lake Tahoe, CA
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location: 38.91, -120.01     debug


Area Discussion for - Reno, NV
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Fxus65 krev 141118
afdrev
area forecast discussion
national weather service reno nv
318 am pst Wed nov 14 2018

Synopsis
High pressure will lead to dry and stagnant conditions through the
week. Localized degradation of air quality is possible under
valley inversions. A pattern change next week may open the door
for a couple of weak storm systems but heavy precipitation is
unlikely.

Short term
The only notable change in the short term forecast period was
decreasing coverage of smoke and haze today. Latest observations
indicate low ceilings and visibility reductions only in the lower
valleys of north central ca, while western foothill sites such as
auburn and grass valley remained clear. Satellite fire products
have indicated reduced fire activity since midnight. While we
can't rule out some lingering haze aloft this morning for parts of
northeast ca, low mixing heights near the camp wildfire with weak
flow today should keep a majority of the smoke confined to the
lower elevations around the sacramento river valley, with limited
transport of additional smoke east of the sierra (assuming no
major surge in fire activity during the day).

Otherwise, high pressure over ca-nv will keep light winds, limited
mixing and inversion conditions in place for the next few days.

Air quality may have some modest reductions in urban areas due to
these inversions, but not related to smoke from the camp wildfire.

Compared to yesterday, overall cirrus cloud coverage looks to be
less widespread, which should allow for a bit more warming today
with highs near 60 degrees for far western nv and sierra valleys,
and a few degrees cooler for the west central nv basin. Little
change in daytime highs are expected from today through Friday.

Mjd

Long term Saturday through Tuesday...

a few minor adjustments were made to the far extended part of the
forecast this cycle... Mainly to adjust timing of any precipitation.

There remains general agreement between the operational models and
most ensemble members for days 4-6 in the extended forecast. Ridging
over the region early on gives way to a closed low approaching the
southern california coast late Monday. Ahead of this low... Moisture
may begin to be drawn north into the region... But it should result
in just increased clouds. Both the GFS and ECMWF show this low
trekking east across the desert southwest part of the u.S. Early
Tuesday.

That is when the model agreement starts to break down. The ECMWF has
become the more progressive model with a long wave trough moving
into the west coast late Tuesday. The GFS is now much slower and
does not really bring this trough to bear on our area until later
Wednesday. We inherited some very low end pops for Tuesday
afternoon. Those have been decreased and we pushed any precipitation
chances back to no earlier than Tuesday evening overnight. It
remains to be seen how this system will evolve. For now... While the
chances for seeing a pattern change to a wetter scenario are
increasing... The overall confidence on timing and amounts is still
rather low.

Aviation
Vfr conditions continue with areas of high clouds and light winds
for the next several days. There may be modest reductions of
slantwise visibility in parts of northeast ca today due to haze
aloft from the camp wildfire, but overall smoke-related impacts to
aviation look to remain well west of the sierra crest. Mjd

Rev watches warnings advisories
Nv... None.

Ca... None.

For more information from the national weather service visit...

http: weather.Gov reno


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
South Lake Tahoe, Lake Tahoe Airport, CA1 mi23 minS 410.00 miFair22°F12°F68%1034.7 hPa
Carson City Airport, NV24 mi21 minN 010.00 miFair25°F5°F42%1032.8 hPa

Wind History from TVL (wind in knots)
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Last 24hrS4CalmCalmCalmCalmNE4CalmNE3CalmCalmCalmS3CalmS3SW3S3CalmS3S3S4CalmS4S4S4
1 day agoS3CalmCalmNE754CalmCalmCalmCalmCalmSW3S3S3CalmS3CalmS3S3S3CalmS4S4S3
2 days agoCalmSE3NE64335CalmCalmS3S3S3CalmCalmS3S4S3CalmS4S3CalmCalmS4Calm

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Wed -- 06:46 AM PST     Sunrise
Wed -- 07:31 AM PST     0.01 feet Low Tide
Wed -- 12:38 PM PST     Moonrise
Wed -- 01:02 PM PST     2.26 feet High Tide
Wed -- 04:53 PM PST     Sunset
Wed -- 07:29 PM PST     0.81 feet Low Tide
Wed -- 10:57 PM PST     2.25 feet High Tide
Wed -- 11:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.21.91.51.10.70.40.2000.411.62.12.32.21.91.51.210.80.91.422.2

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
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Wed -- 06:01 AM PST     0.01 feet Low Tide
Wed -- 06:46 AM PST     Sunrise
Wed -- 11:53 AM PST     2.26 feet High Tide
Wed -- 12:38 PM PST     Moonrise
Wed -- 04:53 PM PST     Sunset
Wed -- 05:59 PM PST     0.81 feet Low Tide
Wed -- 09:48 PM PST     2.25 feet High Tide
Wed -- 11:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.81.40.90.50.30.100.20.61.21.72.12.32.11.81.41.10.90.811.62.12.22.2

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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Wind Forecast for Reno, NV (11,2,3,4)
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Ground Weather Radar Station Reno, NV
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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.