Wednesday, January17, 2018

Marine Weather and Tides
Sunnyside-Tahoe City, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:15AMSunset 5:06PM Wednesday January 17, 2018 12:46 AM PST (08:46 UTC) Moonrise 7:39AMMoonset 5:54PM Illumination 0% Phase: New Moon; Moon at 1 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 Sunnyside-Tahoe City, CA
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location: 39.18, -120.15     debug

Area Discussion for - Reno, NV
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Fxus65 krev 162329
area forecast discussion
national weather service reno nv
329 pm pst Tue jan 16 2018

A strong winter storm will impact the region for the end of the
week. Strong winds will develop Thursday with a period of heavy
snowfall in the mountains late Thursday afternoon through early
Friday morning. There is even a potential for snow down to all
valley floors by Friday morning. Blowing snow and poor visibility
will accompany snowfall.

Short term
Generally mild weather today and Wednesday with cloudy skies and
above average high temperatures. All that is about to change
starting early Thursday morning as a strong pacific storm brings
strong winds and moderate to heavy snow to the region through
Friday. This storm has the best chance of bringing low to mid
elevation mountain snow we have seen so far this season with a
good combination of available moisture and cold air. While the
system has a decent moisture tap and strong jet forcing on the
positive side, it is also going to move through the region quite
quickly, which may limit the overall precipitation totals and how
long the strong winds may last. Cold and unstable air after the
front should allow for snow showers to continue through Friday
afternoon in the sierra with additional snow accumulation probable
during the day.

A strong cold front will move through the region allowing the
largest pool of cold air to move over the region so far this
'winter'. Confidence is high in strong winds, low snow levels, and
a period (6-9 hrs) of moderate to heavy mountain snowfall.

Confidence is lower for snow accumulation amounts and timing in
western nevada valleys. There is a chance that low elevation
snowfall could create hazardous travel conditions in the
reno carson metro areas overnight Thursday into Friday morning.

There will likely be a burst of snow in western nevada along the
front, but much of the accumulating snow, if it occurs, could be
from smaller scale convective showers behind the front which are
very hard to predict. A probable scenario would be 1 2 to 1 inch
of snow in the lowest valleys along the front with additional
showers during the day bringing sporadic accumulations to the
valleys. Remember, if that 1 2" comes near commute time, it can
still cause significant travel issues.

Winds pick up early Thursday morning ahead of the cold front as
700 mb flow increases to 50-60 kts. Forecast soundings show a
solid temperature inversion around ridgetop level which should
create a few hours of intense downslope winds in western nevada
valleys. The strongest winds will most likely only last 6-8 hours
since the cold front moves through the region quickly. A high wind
watch has been issued for mono county and portions of western
nevada Thursday with winds at the surface up to 50-60 mph and up
to 80 mph in wind prone locations.

The combination of strong winds, and cold low density snow, will
create periods of low visibility, especially over sierra passes.

This is something we haven't experienced this winter, so be
prepared for challenging driving conditions with low visibility.


Long term Saturday through Tuesday...

Saturday through early Sunday will be a break between weather
events as high pressure briefly moves overhead. Temperatures will
be near or slightly below average.

Sunday into Monday the next wave will move into the northwest
conus, bringing increased winds, mountain snow, and valley rain
and snow. Simulations are trending more progressive with less cold
air intrusion. If simulations stay on this trend, it would mean
higher snow levels with mostly rain for the lower valleys, or at
least a period of snow changing quickly over to rain. However, a
more progressive flow would also bring the potential for much
higher precipitation totals as a more solid pacific moisture
tap ar plume would then impact the region. As far as the sierra
snowpack, snow levels even in the wetter scenarios are not high
enough to preclude hefty snowfall totals in the sierra, at least
above about 6500 feet. Details are nebulous with the recent swing
to warmer and wetter so stay tuned for clarification.

Beyond the forecast period into mid to late next week, model
simulations go off the rails as the ec builds a ridge over the far
eastern pacific while the GFS keeps the door open for additional
systems. The ec would be drier and colder with possible slider-
type systems for northeast ca and western nv. Forecaster
confidence is abysmal at this time so we will have to wait and see
which way the pattern trends. -snyder

A ridge of high pressure will build over northeast ca and western
nv tonight and Wednesday, bringing precipitation-free conditions
although plenty of mid to high clouds could persist. Turbulence
looks generally low (near and below ridges) with modest winds over
ridges and mainly light flow near the surface. Patchy fog is
possible near ktrk, although chance are fairly low (20%) if clouds
persist through Wednesday morning.

A strong cold front will move into the region Thursday into
Friday. Thursday's winds will be quite strong, especially within
about 6 hours of fropa, with wind gusts at area terminals 35-50
kts, causing low-level wind shear and moderate to severe mountain
wave turbulence over and downwind of the sierra. This storm will
also bring snow or rain quickly changing to snow to the region
Thursday night into Friday, along with at least periodic MVFR ifr
cig vis to area terminals. A light accumulation (up to an inch) is
possible for western nv terminals. -snyder

Rev watches warnings advisories
Nv... Winter storm watch from Thursday afternoon through Friday
afternoon nvz002.

High wind watch from Thursday afternoon through late Thursday
night nvz001.

High wind watch from Thursday morning through Thursday evening

Ca... Winter storm watch from Thursday afternoon through Friday
afternoon caz071-072.

High wind watch from Thursday afternoon through late Thursday
night caz073.

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, CA10 mi52 minSE 30.50 miFreezing Fog28°F28°F100%1027.1 hPa
South Lake Tahoe, Lake Tahoe Airport, CA20 mi54 minN 07.00 miMostly Cloudy29°F27°F92%1025.6 hPa
Carson City Airport, NV22 mi52 minN 010.00 miPartly Cloudy34°F30°F87%1027.1 hPa

Wind History from TRK (wind in knots)
Last 24hrCalmSW10W4SW13
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4----Calm--W3NW3CalmCalmCalmSE3SE3N3
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm----CalmCalmCalmE3CalmW3CalmE4CalmCalmCalm

Tide / Current Tables for Sacramento, Sacramento River, California
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Click for MapNote: These data apply only during low river stages.

Wed -- 03:15 AM PST     -0.05 feet Low Tide
Wed -- 07:21 AM PST     Sunrise
Wed -- 07:42 AM PST     Moonrise
Wed -- 08:12 AM PST     2.60 feet High Tide
Wed -- 02:37 PM PST     0.92 feet Low Tide
Wed -- 05:11 PM PST     Sunset
Wed -- 06:01 PM PST     Moonset
Wed -- 06:32 PM PST     3.15 feet High Tide
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
Click for Map
Wed -- 03:15 AM PST     -0.05 feet Low Tide
Wed -- 07:21 AM PST     Sunrise
Wed -- 07:42 AM PST     Moonrise
Wed -- 08:12 AM PST     2.59 feet High Tide
Wed -- 02:37 PM PST     0.91 feet Low Tide
Wed -- 05:11 PM PST     Sunset
Wed -- 06:01 PM PST     Moonset
Wed -- 06:32 PM PST     3.14 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of CentralWestCoast    EDIT

Wind Forecast for Reno, NV (3,6,7,8)
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Ground Weather Radar Station Reno, NV
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weather_mapweather_map weather_map

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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 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 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.