Tuesday, December10, 2019
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Marine Weather and Tides
Carnelian Bay, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:08AMSunset 4:38PM Tuesday December 10, 2019 8:17 AM PST (16:17 UTC) Moonrise 3:52PMMoonset 5:27AM Illumination 98% Phase: Waxing Gibbous; Moon at 14 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 Carnelian Bay, CA
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location: 39.22, -120.09     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 101130 AFDREV

Area Forecast Discussion National Weather Service Reno NV 330 AM PST Tue Dec 10 2019

SYNOPSIS.

High pressure remains in place today, but a weak incoming weather system may bring very light snow showers to the mountains this evening into Wednesday; little accumulation is expected. A stronger weather system could impact the region by the end of the week into the weekend.

SHORT TERM.

High pressure will provide one more day of light winds, inversions, and reduced ventilation in the lower valleys (below about 6,500'). There will be changes through the day however as an incoming weak low pressure system passes through the region tonight into early Wednesday.

For today, this low will increase high clouds, strengthen Sierra ridgetop winds, and provide very light mountain snow and valley rain showers tonight. Sierra ridgetop gusts of 40-50 mph will be possible by mid-afternoon as the low approaches and then peak this evening with gusts up to 50-60 mph.

Precipitation will be light with generally a dusting of snowfall across Sierra with about 30% probability of accumulating 1 inch of snowfall on the Tahoe Basin passes through early Wednesday morning. The main window for seeing some light snow showers across Donner Summit on I-80 generally looking about 10pm-4am, about an hour later across Echo Summit on Highway 50, and after midnight through Mono county. Although only light snowfall is expected, this still can be impactful to trans-Sierra traffic with slick and icy conditions. Across western Nevada valleys, a few hundredths of an inch of light rainfall will be possible through early Wednesday morning.

Sierra ridgetops remain moderately gusty on Wednesday with breezy winds reaching into the lower valleys Thursday result in better mixing and ventilation. This will yield mild temperatures by mid- December standards with valleys reaching the mid to high 50s. Winds will begin to increase again early Thursday morning for the Sierra ridges as the next storm approaches. Light precipitation is possible across the Sierra crest from about Alpine County northward and across far northeast California near the Oregon border. Snow levels will be quite high, so should see mainly light rainfall below 7500-8000 through late Thursday into early Friday morning. Fuentes

LONG TERM. Friday onward .

Friday will be quite mild for mid-December as we are on the warm side of the jet stream with a weak plume of atmospheric river moisture directed into the Pacific Northwest. Northeast California and northern Nevada will be on the southern end of this moisture plume, but it will be enough to bring light rain and very high elevation snow (8000-9000 feet) to the region on Friday.

How the remainder of the system progresses over the weekend has been varying in scenarios. What we know is a cold front will drift south by Saturday/Saturday night dropping snow levels potentially to all valley floors. There will also likely be a period of enhanced precipitation rates with the front, but it's a quick shot, which would limit totals. The uncertainty lies in snowfall as the cold air will be chasing the exiting moisture. Some scenarios would lead to light accumulations on valley floors, but more likely is that accumulations would remain above 5000 feet. There is another shortwave that follows on Sunday, which could lead to one more round of light snow at most all elevations. Once again, there is a spread on snow amounts from nothing at all to several inches. The three parts of the storm are unlikely to yield significant liquid totals, however, travel impacts are certainly likely, especially Saturday into Sunday.

Following this system, the forecast gets quiet for a few days, but the flow remains progressive (i.e. stagnant conditions not expected). Ensemble guidance is hinting at chances for another storm around Dec 19-21, with general troughiness and storm chances continuing into the days leading up to Christmas. This agrees with the CPC 8-14 day outlook which favors below normal temperatures and above average chances for precipitation during the timeframe. Christmas travel may be impacted, especially given Murphy's Law. No need to freakout yet, but be sure to check back if you have travel plans. -Dawn

AVIATION.

Dense fog remains in place in the Martis Valley, including KTRK. The question today is if we'll see the valley mix out enough to erode the fog layer. Mixing is rather limited early today, but winds will be increasing aloft ahead of a weak wave that will pass through the region tonight. Forecast soundings are showing drier air aloft also eroding the stratus deck, so there is a 75% chance we'll see clearing at KTRK by mid morning or early afternoon.

A weak system moves in tonight into Wednesday bringing light rain and snow along with the return of lower ceilings obscuring terrain. This system is likely to keep fog from returning to KTRK most of tonight, but if skies clear fast enough, early morning fog is still possible. Runways in the Sierra could see a dusting of snow tonight.

Winds across Sierra ridges are likely to peak this evening in the 50-65 kt range, leading to turbulence along and downwind of the Sierra. -Dawn

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, CA7 mi27 minN 00.25 miFreezing Fog25°F23°F93%1025.4 hPa
Carson City Airport, NV19 mi42 minESE 39.00 miFair27°F24°F93%1024.4 hPa
South Lake Tahoe, Lake Tahoe Airport, CA22 mi24 minS 6 miFair23°F19°F85%1027.1 hPa

Link to 5 minute data for KTRK

Wind History from TRK (wind in knots)
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Last 24hrCalmCalm--N3CalmCalmCalmCalmCalmCalmE3CalmE3CalmW3CalmCalmE4SE4SE3E3CalmCalmCalm
1 day ago----------Calm------CalmCalmCalmCalmCalmS4CalmCalmSE3CalmCalmCalmCalmCalmS3
2 days agoSW13
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S7SW3SE3E3CalmS4CalmSW3SW4CalmE3CalmCalmCalm--

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Tue -- 01:36 AM PST     -0.04 feet Low Tide
Tue -- 05:31 AM PST     Moonset
Tue -- 06:15 AM PST     2.14 feet High Tide
Tue -- 07:12 AM PST     Sunrise
Tue -- 12:34 PM PST     0.67 feet Low Tide
Tue -- 03:58 PM PST     Moonrise
Tue -- 04:44 PM PST     Sunset
Tue -- 05:03 PM PST     3.11 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0-00.51.21.82.12.11.81.51.10.90.70.71.222.83.132.82.31.81.20.8

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Tue -- 12:06 AM PST     -0.04 feet Low Tide
Tue -- 05:06 AM PST     2.14 feet High Tide
Tue -- 05:30 AM PST     Moonset
Tue -- 07:12 AM PST     Sunrise
Tue -- 11:04 AM PST     0.67 feet Low Tide
Tue -- 03:54 PM PST     3.11 feet High Tide
Tue -- 03:59 PM PST     Moonrise
Tue -- 04:45 PM PST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-00.10.71.41.92.121.81.410.80.70.81.42.32.93.132.72.21.61.10.60.2

Weather Map
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wmap_P
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Reno, NV (11,2,3,4)
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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 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.