Monday, April23, 2018 L-36.com


Marine Weather and Tides
Truckee, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:09AMSunset 7:48PM Monday April 23, 2018 2:26 AM PDT (09:26 UTC) Moonrise 12:11PMMoonset 1:44AM Illumination 56% Phase: First Quarter Moon; Moon at 8 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 230905
afdrev
area forecast discussion
national weather service reno nv
205 am pdt Mon apr 23 2018

Synopsis
Warm afternoon temperatures are expected through Thursday, with a
cool down to near or possibly below average temperatures by next
weekend. Low pressure developing off the california coast will
bring increasing chances for showers and a few thunderstorms from
mid week into the weekend, with breezes increasing by Friday.

Short term
Aside from scaling back isolated coverage of thunderstorms on
Wednesday afternoon, changes to the forecast were minimal. The
short term forecast will be characterized by high pressure with
generally dry conditions, temperatures that are well above
average, generally light winds, and low chances of thunderstorms
over higher terrain of the sierra mainly south of highway 50.

Flow will be northerly today keeping conditions slightly "cooler"
with temperatures in the mid 70s for western nevada and the
mid upper 60s for sierra valleys rather than upper 70s to low 80s
and low 70s respectively for Tuesday and Wednesday. This flow
regime is typically not favorable for thunderstorm formation, but
winds will be rather light. The one area that could see enough
warming and surface convergence to initiate a rare thunderstorm is
the sierra crest in southern mono county. Still, chances are only
up to 10%.

Ridging shifts eastward slightly by Tuesday allowing for a
stronger temperature discontinuity between the sacramento valley,
the sierra, and central nevada. This favors increased surface
convergence for the eastern sierra. Isolated thunderstorms are
possible along the sierra crest from mono county in the early
afternoon to around the west side of lake tahoe late in the
afternoon.

The biggest forecast change involved trimming some chances of
thunderstorms from Wednesday afternoon. While the ridge will
remain in a favorable position for surface convergence, the upper
low feature's eastward progression has once again slowed in model
forecasts. As a result, there is less instability aloft to allow
for wider coverage of thunderstorms. However, coverage will be
greater than Tuesday with the sierra front and first ranges in
western nevada like the pine nuts seeing some isolated coverage.

Chances were removed from lassen and eastern plumas counties where
stability parameters are now unfavorable for thunderstorms. Boyd

Long term Thursday onward...

the main focus for the long term continues to be the problematic
closed off low in the eastern pacific and how it progresses inland.

These types of lows are notoriously tricky to forecast and
forecaster confidence Friday onward is very low. Typically, as we
get closer to an event, the ensemble and operational model spread
decreases, but this is a case where each model run has brought a
new range of differing solutions.

For Thursday, there is decent confidence in the low remaining
offshore. Increasing moisture and instability in southerly flow
ahead of it will bring chances for showers and thunderstorms in the
afternoon and evening. This will be especially true for the sierra
and adjacent lower valleys of western nevada, as well as the
sweetwater and pine nut ranges.

The operational GFS is now opening the low up into a wave and
quickly bringing it through oregon Friday night, with a secondary
piece of energy carving a large trough over the west by the end of
the weekend. The ec now looks similar to what the operational gfs
looked like yesterday and brings a closed low over california and
nevada for the weekend, ejecting it eastward as another wave drops
south into the pacnw. Ensemble spread in both models is significant,
to the point nearly each perturbation ends up with a differing
solution. What can be gleaned from this is the weekend is looking
cooler with chances for showers and some thunderstorms. However, the
various features and placement of the low will have major
implications on the exact forecast. -dawn

Aviation
Vfr conditions are expected today through much of the week with
the exception of ktrk where morning fog remains possible.

The only other flight concern will be low chances of afternoon
thunderstorms mainly over the sierra crest through mid week.

Chances for showers and thunderstorms increase late this week as
low pressure approaches the region. Boyd

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 mi32 minN 010.00 miFair32°F28°F87%1022.3 hPa
Reno, Reno Tahoe International Airport, NV24 mi32 minW 310.00 miA Few Clouds52°F28°F40%1016.3 hPa

Wind History from TRK (wind in knots)
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Last 24hrCalmCalmCalmCalm--Calm----------SW11
G16
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SW8W8W4S5S4CalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalm--CalmSE7SE8--S8W7W10--W13W7CalmSW4CalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmN3CalmCalmS4N5N9N6N4N8NE5N3S4SE6CalmCalmE4CalmCalm

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

Mon -- 02:47 AM PDT     Moonset
Mon -- 02:59 AM PDT     2.34 feet High Tide
Mon -- 06:18 AM PDT     Sunrise
Mon -- 09:37 AM PDT     0.71 feet Low Tide
Mon -- 01:18 PM PDT     Moonrise
Mon -- 01:36 PM PDT     2.53 feet High Tide
Mon -- 07:50 PM PDT     Sunset
Mon -- 10:51 PM PDT     -0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.62.12.32.21.91.61.20.90.70.81.222.52.52.42.11.71.30.90.50.2-0-0.1

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Mon -- 02:47 AM PDT     Moonset
Mon -- 02:59 AM PDT     2.33 feet High Tide
Mon -- 06:18 AM PDT     Sunrise
Mon -- 09:36 AM PDT     0.71 feet Low Tide
Mon -- 01:18 PM PDT     Moonrise
Mon -- 01:36 PM PDT     2.53 feet High Tide
Mon -- 07:50 PM PDT     Sunset
Mon -- 10:51 PM PDT     -0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.62.12.32.21.91.51.20.90.70.71.222.42.52.42.11.71.30.90.50.2-0-0.1

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Reno, NV (5,6,7,8)
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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.