Friday, August18, 2017 L-36.com


Marine Weather and Tides
Truckee, 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 6:15AMSunset 7:53PM Thursday August 17, 2017 11:47 PM PDT (06:47 UTC) Moonrise 12:54AMMoonset 3:40PM Illumination 17% Phase: Waning Crescent; Moon at 26 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 172037
afdrev
area forecast discussion
national weather service reno nv
137 pm pdt Thu aug 17 2017

Synopsis
Thunderstorms remain a possibility each day through the middle of
next week. Storms today and Friday will be mainly over the sierra,
potentially becoming more widespread this weekend into early next week
but predictability remains below average. Flash flooding is the main
threat from storms due to slow storm movement. Temperatures through
the weekend will be near to slightly above normal, with weak westerly
winds each afternoon.

Discussion
* thunderstorms today and Friday: following reliable ncar high- res
ensemble guidance, light north northeast steering flow will confine
best storm risks to over the sierra and points west today and
tomorrow. Similar to what happened Wednesday - mainly non- severe
heavy rainers. Flow aloft Friday is very light meaning that outflow
boundary interactions will dominate storm evolution, movement.

Instability further east over W nevada is very sketchy, so while we
can't rule out some cells, coverage should be minimal for W nevada
cities.

* thunderstorms this weekend: this is where things get interesting.

Flow aloft GOES from light westerly to light southeasterly Saturday
to Sunday as upper low re-deepens off socal coast. Unresolvable
shortwaves, plenty of moisture, and weak-moderate instability will
surely trigger storms each afternoon, with Saturday looking the most
promising of the two weekend days for widespread stronger storms.

Flash flooding could be the bigger issue with light steering flow
each day and precipitable waters in the "sweet spot" between 0.6"
and 0.8". Too much higher than that and we tend to cloud cover with
little convection.

* thunderstorms next week: upper low looks to remain off socal into
Tuesday before ejecting northeastward on Wednesday or Thursday, but
these pattern changes are often very low predictability this far
out. So we've kept low-end chances for storms in the forecast each
day through Wednesday. Hard to tell this far out if any of these
days could go big with storms or flash flooding.

* eastern sierra smoke: latest GFS transport wind forecasts and usfs
bluesky model keep northeast flow going into Saturday over the
eastern sierra. This will keep the thickest smoke from yosemite-
area fires away from the east side. Some haze is possible right
along the crest however.

* eclipse weather: high confidence remains in us having a solar
eclipse Monday morning, but lower confidence on cloud cover
potential. Time lag ensemble of recent GFS runs is 60 40 for us
having scattered-broken convective debris clouds in the region
versus sunny skies. Whether or not this would be enough to obscure
the eclipse is unknown. We should have a better sense this weekend
on cloud cover potential for Monday, and may issue an unofficial
eclipse cloud watch if needed.

-chris

Aviation
* the main aviation impact over the next couple days will be from
mountain thunderstorms. Isolated storms will develop after 21z today
and Friday mainly over the sierra including around mmh, tvl, trk.

About a 20% chance of storms within vicinity of those airfields.

Steering flow today is light NE taking storms mainly to west slopes,
but Friday steering flow is very light meaning that random outflow
boundaries will dictate storm movement. Slightly higher chance of
seeing storms at tvl, trk, mmh Friday. Storm chances for rno, cxp
<5% today and about 10-15% Friday afternoon.

* otherwise, conditions will beVFR with light morning winds followed
by low-end zephyr westerlies 10 kts or less. If areas like trk end
up getting rainfall, dense morning fog Friday or Saturday mornings
is a good bet.

-chris

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
Truckee-Tahoe, CA3 mi73 minSSW 310.00 miFair57°F42°F59%1025.7 hPa
Reno, Reno Tahoe International Airport, NV24 mi53 minN 010.00 miFair79°F45°F30%1014.6 hPa

Wind History from TRK (wind in knots)
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Last 24hrS3CalmCalmCalmCalmCalmCalmCalmCalm------NE4S3NE5N3CalmNW6W7W8S3CalmSE3Calm
1 day agoCalmE4CalmCalmCalmCalmCalmCalmCalmCalmCalm--CalmN4NW6W12
G16
NW8S9
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SE13SW6CalmSE4CalmS3
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE8
G14
------W8--NE8SW3CalmCalmCalmE4

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

Fri -- 02:59 AM PDT     Moonrise
Fri -- 03:58 AM PDT     3.28 feet High Tide
Fri -- 06:23 AM PDT     Sunrise
Fri -- 01:15 PM PDT     -0.03 feet Low Tide
Fri -- 05:41 PM PDT     Moonset
Fri -- 05:56 PM PDT     2.48 feet High Tide
Fri -- 07:55 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.42.333.33.22.92.41.91.40.90.50.1-00.10.81.62.22.52.321.61.20.9

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Fri -- 02:59 AM PDT     Moonrise
Fri -- 03:58 AM PDT     3.27 feet High Tide
Fri -- 06:23 AM PDT     Sunrise
Fri -- 01:15 PM PDT     -0.04 feet Low Tide
Fri -- 05:41 PM PDT     Moonset
Fri -- 05:56 PM PDT     2.47 feet High Tide
Fri -- 07:55 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.42.333.33.22.92.41.91.40.90.50.1-00.10.81.62.22.52.321.61.20.9

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

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Reno, NV (2,6,7,8)
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Ground Weather Radar Station Reno, NV
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weather_mapweather_map weather_map

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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.