Friday, February22, 2019 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 6:40AMSunset 5:46PM Friday February 22, 2019 9:08 AM PST (17:08 UTC) Moonrise 9:40PMMoonset 8:52AM Illumination 89% Phase: Waning Gibbous; Moon at 18 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 220953
afdrev
area forecast discussion
national weather service reno nv
153 am pst Fri feb 22 2019

Synopsis
A few very light snow showers are possible this morning along the
east and northeast facing slopes of the sierra due to weak upslope
flow. Weak high pressure will provide a break from the snow
Saturday, but temperatures will remain below normal. We should
transition back to a more active pattern late in the weekend and
next week.

Short term
The most significant lake enhanced snow showers have ended over
the region. We could still see a few showers through the morning
hours... But those will be more of the upslope variety as the low
level flow becomes northeast. Snow showers this morning will
favor the east and northeast facing slopes of the sierra where
upslope potential will be maximized. Even so... Accumulations will
be light.

A weak shortwave ridge develops tonight and Saturday. This should
lead to rather cold conditions again as we see a mainly clear sky
for all but areas near the oregon border. This ridge presses east
rather quickly and we then transition to a more zonal flow aloft.

A strong west-northwest to east-southeast jet develops Sunday
morning to our north. This should focus the best forcing with the
next system near and north of the oregon border. Model simulations
have been slowing the southward progression of this feature.

While we will continue to indicate at least a chance of precipitation
across the northern half of the forecast area late Sunday... We
will show the best potential in northeast california and far
northwest nevada. A shortwave trough approaching the coast by late
Sunday night will start the process of pushing precipitation
chances farther south as lift ahead of the trough increases... But
this will happen more in the extended portion of the forecast.

With the best forcing to the north... We do expect temperatures to
warm a bit to more typical readings for late february by Sunday.

As the jet begins to sag south by late Sunday... Gusty winds may
begin to develop across the region as well.

Long term Next week (Monday through Saturday)...

few changes made except to lower chances a bit in the sierra Monday
and overall precip amounts a bit, except near the oregon border.

Models continue to show differences in the system for Monday through
Wednesday with the 00z GFS an outlier and extremely wet while the
ec NAM are drier farther north. The gem and fv3 are a compromise
being a bit farther south and wetter, but not nearly as wet as
the gfs. The forecast overall with go with an ec gem blend to go
on the drier side of things, but not too dry. That said, while i
am not using the gfs, its solution is still plausible, although
unlikely. A couple outlier runs from 5 days out were close to
verifying the wet feb. 13-14th system.

A general trend is having the main front draped near the oregon
border Monday, sag south a bit Tuesday before lifting back north
Wednesday. Snow levels will lift off the valley floors along the i-
80 corridor, but the surprise valley may not see them rise much
depending on the location of the front. It could either be a bunch
of rain, or heavy snow there. To give an idea of the range of
solutions for moisture, the sierra crest in tahoe could see as
little as 1 2 inch or more than 5 Monday through Wednesday. The
official forecast is in between these extremes, about 2-2.5 inches.

This gives us maximum flexibility for changes going forward, not
that I think it has the best chance of verifying out of the range of
possibilities.

There will be a short wave ridge after it moves through with mild
temperatures, a few degrees above average for a change. The dry
period looks to be Thursday-Friday. Then another mild system moves
in for next weekend. It continues to look active into the first week
of march. X

Aviation
Snow showers today will be mainly limited to the kmmh area as weak
upslope develops in the eastern sierra. MVFR conditions are still
possible this morning for ktrk and ktvl... But these conditions
will improve through the day. With some clearing overnight... We do
look for a high likelihood of freezing fog around ktrk late
tonight and early Saturday. Right now the chances are about 70%.

Vfr conditions and light winds develop for Saturday. By late
Sunday the next area of low pressure begins to lower CIGS vsbys
and develop light rain snow near the oregon border and down into
northeast california and northwest nevada north of i-80. Gusty
west-southwest winds also begin to develop with a return of
turbulence aloft.

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 mi16 minS 310.00 miFair7°F5°F91%1019.7 hPa
Carson City Airport, NV24 mi14 minN 010.00 miFair18°F10°F73%1017.3 hPa

Wind History from TVL (wind in knots)
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Last 24hrN7NE6NE13
G19
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--N7N1145Calm3SW3CalmCalmCalmS3S3
1 day agoS6S8S644S4CalmN6CalmCalmS3CalmS7S3CalmCalmS3CalmCalmS4CalmSW3S5Calm
2 days agoS4S3------CalmCalmCalmSW3CalmS33SW8S18
G23
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G19
S15SE7S4S11SW6S6S4S7

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Fri -- 04:30 AM PST     -0.04 feet Low Tide
Fri -- 06:48 AM PST     Sunrise
Fri -- 08:58 AM PST     Moonset
Fri -- 09:16 AM PST     2.96 feet High Tide
Fri -- 04:53 PM PST     0.31 feet Low Tide
Fri -- 05:51 PM PST     Sunset
Fri -- 09:13 PM PST     2.95 feet High Tide
Fri -- 09:46 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.81.10.60.2-000.71.72.52.92.92.62.11.61.10.70.40.30.71.62.52.92.92.6

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
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Fri -- 03:00 AM PST     -0.04 feet Low Tide
Fri -- 06:47 AM PST     Sunrise
Fri -- 08:07 AM PST     2.96 feet High Tide
Fri -- 08:58 AM PST     Moonset
Fri -- 03:23 PM PST     0.31 feet Low Tide
Fri -- 05:51 PM PST     Sunset
Fri -- 08:04 PM PST     2.95 feet High Tide
Fri -- 09:46 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.40.1-00.2122.732.92.521.40.90.50.30.411.92.72.92.82.52

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 (12,3,4,5)
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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.