Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Truckee, 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 7:11AMSunset 4:39PM Thursday December 13, 2018 3:21 PM PST (23:21 UTC) Moonrise 11:42AMMoonset 10:37PM Illumination 38% Phase: Waxing Crescent; Moon at 6 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 Truckee, CA
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location: 39.35, -120.19     debug


Area Discussion for - Reno, NV
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Fxus65 krev 131034
afdrev
area forecast discussion
national weather service reno nv
234 am pst Thu dec 13 2018

Synopsis
Light winds and weak inversions return today. A system will bring
light high elevation snowfall for northeast california, with
strong and gusty winds for lower elevations Friday. Another
system late Sunday could bring higher elevation snow with travel
impacts for northeast california and the sierra. Quiet, dry
weather is expected to persist for some time after Monday.

Short term
Main changes: raise high wind watch for the eastern sierra and
northwest nv Friday. Raised temperatures today and especially
Friday. Lowered humidity levels from sierra front southward
Friday.

An upper ridge will build across the region today with warming
temperatures aloft and weak inversions developing. Winds will be
light and temperatures a few degrees cooler for most valleys this
afternoon.

The next shortwave trough will push through the pacific northwest
where most of the moisture will reside. Some light precipitation
will move into northeast ca and far northwest nv late Friday for
perhaps a few inches of snow above 5500 feet mainly from plumas
and sierra counties northward Friday night with little spillover
into western nv. Snow potential is looking even less likely for
the tahoe basin where some very light amounts are possible Friday
night. We removed the chance altogether farther south across mono
county.

The main impact from this system will be the wind. Surface
gradients tighten across northeast ca and northwest nv with 700 mb
flow ramping up to 50-60 kts by Friday afternoon. Clouds will
initially limit warming mixing Friday morning except for the tahoe
basin and northeast ca northwest nv where gradients will tighten
enough to get winds started early in those areas. Winds mixing
will increase during the afternoon as temperatures warm ahead of
incoming trough, and thus expect surface winds to increase and
spread farther south and east to encompass much of the eastern
sierra to about highway 95. Sustained winds 20-30 mph with gusts
40-50 mph are likely Friday afternoon with a short period of
gusts approaching 60 mph. We will hoist a watch for potential high
winds and let the day crew take one more look at model data to
determine the exact impacts. Regardless, there will be impacts
for boaters on area lakes, high profile vehicles and aviation.

Farther east across the basin and range, there is still some
uncertainty how deep the mixing will be as inversions remain a bit
more stubborn. These areas should mix briefly and conditions will
become breezy.

Temperatures will warm to above normal levels Friday afternoon
with 50s for most valley areas. It will also start out quite dry
along the sierra front southward into eastern mono county with
humidity dropping below guidance and into the teens to lower 20
percent range. Wind will decrease Saturday and allow for weak
inversions and slightly cooler temperatures once again although
there is not a lot of cold air associated with the system moving
across the region Friday Friday night. Hohmann

Long term Sunday and beyond...

the focus continues to be on the system moving through late Sunday
into early Monday. Overall changes for this cycle were to increase
the threat of rain snow in the sierra Sunday night into Monday
morning, but trim the threat back Sunday and Monday afternoon. This
is a result of the models in better agreement even with a bit of
split solution.

The ec continues to be a little wetter and not as splitty, but the
gfs fv3 are a bit wetter with the split progressing through Monday
morning before diving southeastward. It looks a high pop low qpf
event for the sierra with some precip falling Sunday night. As a
rough estimate, about 1 2 inch for the sierra crest near tahoe and
1 3 inch for mono county. Snow levels look to average near 6000
feet. With south flow aloft, spillover is not favored and
amounts pops drop off rapidly east of the 395 corridor. The
surprise valley could be an exception up near the oregon border.

After this trough moves through, a moderate amplitude ridge will
build in with mild temps aloft. I have warmed temps for next week a
good 10 degrees above average. While inversions will be present in
the lower valleys, they will not be strong as the past week. Skies
will also be mostly clear during the day. Past mild ridges have put
55-60 degrees around reno carson, but with the lowest Sun angles
close to the winter solstice, kept it at the lower side of this
range.

Looking ahead, the ridge does look to go through some evolution and
it could remain dry into next weekend. After that, predictability of
the pattern so far this winter has been very low. Ensembles and even
the deterministic models (flip flops between trough ridge) show the
low predictability ideas. X

Aviation
Vfr conditions to continue through 12z Friday. Winds will be light
today, but begin to increase tonight over the ridges with gusts to
50-60 kts after 06z and mtn wave turbulence increasing. Friday will
be windy most areas west of the highway 95 corridor with peak gusts
of 40-50kts possible for the terminals (strongest at krno krts).

Mtn wave turbulence and pockets of llws will be present with llws
most likely near ktrk ktvl krno kcxp. Winds will diminish after 03z
Saturday. A few showers are possible near the oregon border with
local MVFR CIGS vis.

Sunday winds will increase again, but peak gusts will be less,
perhaps 30 kts at area terminals. MVFR ifr CIGS vis are likely in
the sierra Sunday night with -snra. X

Rev watches warnings advisories
Nv... High wind watch from Friday afternoon through Friday evening
nvz002-003-005.

Ca... High wind watch from Friday afternoon through Friday evening
caz070>073.

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
Truckee-Tahoe, CA3 mi37 minN 010.00 miClear45°F21°F39%1025.4 hPa
Reno, Reno Tahoe International Airport, NV24 mi27 minNE 310.00 miA Few Clouds50°F23°F35%1025.5 hPa

Wind History from TRK (wind in knots)
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Last 24hrN3SE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE3CalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmS4SW3SE5CalmN3CalmCalmS3W12
G18
W11
G15
CalmSW4W3CalmCalmCalmCalmCalmCalmNW5CalmN3
2 days agoCalmCalmNW3CalmCalmCalmCalmCalmCalmCalmCalmCalmS3CalmCalmSE4N3N3N3Calm--CalmN4Calm

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Thu -- 06:34 AM PST     -0.02 feet Low Tide
Thu -- 07:15 AM PST     Sunrise
Thu -- 11:45 AM PST     Moonrise
Thu -- 12:13 PM PST     2.34 feet High Tide
Thu -- 04:45 PM PST     Sunset
Thu -- 06:51 PM PST     0.79 feet Low Tide
Thu -- 10:20 PM PST     2.30 feet High Tide
Thu -- 10:44 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.11.71.20.80.40.1000.311.62.12.32.321.71.310.80.81.11.82.32.3

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
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Thu -- 05:04 AM PST     -0.02 feet Low Tide
Thu -- 07:14 AM PST     Sunrise
Thu -- 11:04 AM PST     2.34 feet High Tide
Thu -- 11:45 AM PST     Moonrise
Thu -- 04:45 PM PST     Sunset
Thu -- 05:21 PM PST     0.79 feet Low Tide
Thu -- 09:11 PM PST     2.30 feet High Tide
Thu -- 10:44 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.10.60.30.1-00.10.61.21.82.22.32.221.61.20.90.80.91.422.32.32.1

Weather Map and Satellite Images
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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 (18,4,5,8)
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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.