Tuesday, November20, 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 6:49AMSunset 4:43PM Tuesday November 20, 2018 6:22 AM PST (14:22 UTC) Moonrise 3:38PMMoonset 3:51AM Illumination 94% Phase: Waxing Gibbous; Moon at 12 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 201111
afdrev
area forecast discussion
national weather service reno nv
311 am pst Tue nov 20 2018

Synopsis
Dry and stagnant conditions with valley inversions through
Wednesday morning. A pattern change will bring gusty winds, valley
rain and mountain snow Wednesday to Saturday. Be prepared for
slow travel and winter driving conditions Wednesday to Friday.

Short term
* rain and snow for most travel routes in the sierra from
Wednesday afternoon to Thursday morning.

* increasing winds Thursday afternoon with strong gusty winds by Friday
morning.

* best chance for rain and snow across western nv is Wednesday
evening. (snow levels near and above 5500 ft)

Today...

this morning will be the last day of strong valley inversions as high
pressure shifts eastward. Cloud cover will also be increasing
ahead of a weak to moderately strong storm system that will bring
travel impacts mainly to the sierra and fairly widespread rain
Wednesday.

Wednesday...

model timing remains fairly consistent with a wave moving into
northern california and nevada early Wednesday morning. This wave
remains somewhat unsupported by split, upper-level flow between a
strong jet draped across the southern portions of california and
nevada and a weaker jet moving through the pacific northwest. By
sierra standards, this will not be a blockbuster system. Still,
forcing parameters will line up to keep a consolidated wave moving
through bringing travel impacts and a decent amount of snow for
the higher sierra. If you have travel plans, it would be
best to be over the sierra before noon.

Rain snow - there has been an increase in moisture over previous
model runs as depictions show forcing from the approaching wave
aligning with the divergent quadrant of the strong jet maximum
draped across the southern portions of california and nevada. As
such, higher elevation snow accumulations now range 6-15 inches
with a few "lucky" spots capable of reaching 18 inches. While
moisture has increased, so have snow levels. Models are a little
warmer for the afternoon hours and snow levels are expected to
lift to around 7500 feet which coincides with the heaviest period
of precipitation. This means that there is a narrower window
Wednesday night for snow to accumulate in the tahoe basin itself.

Totals there have been scaled back to around an inch which should
melt given antecedent rain and warmer surfaces.

Elsewhere, liquid totals were increased as well. With
frontogenetical forcing aligning with synoptic forcing mechanisms,
western nevada will not be as blocked like most systems. Still,
we're generally expecting less than 0.3 inches of precipitation
for lower valleys - not much in the grand scheme of things.

Winds - not expected to be overly strong and have been scaled
back somewhat. With more rain forecast, wind gusts will be
tempered a little and now are expected to be out of the south in
the 25-30 mph range along the sierra front. There could still be a
few channeled locations where gusts briefly reach 35-40 mph, but
the duration and expanse of the wind field have been scaled down.

Thanksgiving day...

precipitation will linger in the sierra, but rates will fall off
quite a bit. Best chances of continuing precipitation will be
north of interstate 80 and along the sierra crest down to highway
50. Still another inch or two of snow will be possible down to
around 6000 feet. Only sprinkles are expected for the sierra
front.

As precipitation slacks off, winds will begin to rise and shift
southwesterly. Overall, the forecast for winds has been lowered
for thanksgiving day, but gusts could still reach 40 mph along the
sierra front in the afternoon hours. This could pose a hazard for
higher profile vehicles especially along highway 395 through
washoe valley and between doyle and susanville.

Friday...

downslope wind signatures ramp up by Friday morning as another
wave moves into the sierra. One change over previous runs is that
the downslope signatures are much more pronounced and more acutely
support strong gusty winds along the sierra front. Currently,
gusts are expected in the 45-55 mph range with up to 70 mph for
wind prone areas; this will present a significant hazard to high
profile vehicles. You may want to consider waiting until after
Friday to put up any outdoor holiday decorations if you haven't
put them out yet. Otherwise, it would be best to secure your
decorations.

This wave is not as wet as the Wednesday wave, but another several
inches of snow will be possible over sierra passes above 7000-7500
feet. Boyd

Long term Friday night onward...

* no major changes to the forecast thinking.

* Saturday afternoon through Monday will be a clear post-
thanksgiving travel window.

Precipitation rates will begin to wane Friday night with all rain
and snow expected to be out of the region by late Saturday morning.

Snow levels will be hovering around 7000-7500 feet Friday night, so
if your travel plans do take you across the sierra, keep in mind
that several passes could see light additional snow accumulation
with possible travel delays. If you can wait, Saturday afternoon
through the early part of next week will be a clear travel window.

The strong and gusty winds Friday will be on the decline Friday
night with lighter winds anticipated throughout the weekend.

A brief period of ridging over the west will keep seasonable
temperatures and dry conditions over the region Sunday through
Tuesday. All signs point toward wet weather likely returning by the
middle or end of next week, with the pattern potentially remaining
active into the start of december. -dawn

Aviation
Conditions will remainVFR through Wednesday morning with minor
slantwise visibility reductions possible as smoke from the camp fire
filters into the region aloft.

Significant changes are coming Wednesday afternoon through Saturday
morning with a series of storms moving through the region. Southerly
winds will begin to increase Wednesday which local studies have
shown bring an increased risk of llws to krno. Sw-w winds will
further increase Thursday and Thursday night with gusts of 30-40
mph bringing potential for turbulence and mountain wave activity.

The strongest winds now look to affect the area Friday morning and
afternoon with forecast model soundings and cross-sections all
indicating a strong probability of downslope winds. Wind gusts
could potentially reach 45-55 mph (local wind prone locations up
to 70 mph) along the eastern sierra front, which includes krno,
kcxp, and kmmh. Windy conditions will also exist for mountain
terminals with 40-50 mph gusts possible for ktvl and ktrk. The one
mitigating factor is the anticipated precipitation which can act
to dampen wind speeds. Therefore, confidence is moderate at this
time, but if these winds do come to fruition, it would cause
significant air travel impacts in the region starting around
daybreak Friday through Friday evening.

Periods of valley rain and mountain snow are also expected Wednesday
through Saturday morning leading to lowered ceilings and visibility
along with mountain obscuration. For krno and kcxp, precipitation
will stay as rain with less than a 10% chance of any snow mixing in.

Ktrk and ktvl will be going back and forth between rain and snow
through the event with minor accumulations possible. Kmmh will
likely be snow Wednesday and Thursday, with a mix of rain and snow
possible for Friday. The best chances for accumulation for all
mountain terminals will be Wednesday night into Thursday morning. -
dawn

Fire weather
Main concern here is the threat for gusts of 50 mph or more
Friday morning and afternoon. Simulations have been trending
stronger with the winds, with a delay in the strongest wind
speeds. Thursday still looks to be windy with gusts of 30-40 mph
possible, but on Friday forecast models are indicating a strong
probability of downslope winds. There is the potential for gusts
as high as 70 mph for the wind prone locations along the sierra
front. Confidence is moderate at this time due to the fact
precipitation can act to dampen wind speeds. Fortunately, wetting
rains are anticipated Wednesday night ahead of the strongest
winds. This along with increasing humidity will mitigate the
potential for widespread critical fire weather conditions.

- dawn brong

Rev watches warnings advisories
Nv... Winter storm watch from Wednesday afternoon through late
Wednesday night above 7000 feet in nvz002.

Ca... Winter storm watch from Wednesday afternoon through late
Wednesday night above 7000 feet in caz072-073.

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 mi47 minN 010.00 miFair14°F12°F92%1021 hPa
Reno, Reno Tahoe International Airport, NV24 mi27 minN 010.00 miFair24°F14°F65%1022.2 hPa

Wind History from TRK (wind in knots)
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Last 24hrCalmCalm--CalmCalmCalmN3Calm--N4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalm----CalmCalm--CalmCalmCalmCalmCalmE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmNE3--N6N5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Sacramento, Sacramento River, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Tue -- 12:28 AM PST     0.15 feet Low Tide
Tue -- 03:56 AM PST     Moonset
Tue -- 04:51 AM PST     2.14 feet High Tide
Tue -- 06:53 AM PST     Sunrise
Tue -- 11:57 AM PST     0.32 feet Low Tide
Tue -- 03:44 PM PST     Moonrise
Tue -- 04:45 PM PST     2.83 feet High Tide
Tue -- 04:49 PM PST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.20.71.422.121.71.30.90.60.40.30.61.32.12.72.82.72.31.91.30.90.5

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 (9,2,3,4)
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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.