Saturday, March28, 2020
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Marine Weather and Tides
Sunnyside-Tahoe City, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:48AMSunset 7:22PM Saturday March 28, 2020 10:11 AM PDT (17:11 UTC) Moonrise 8:15AMMoonset 10:37PM Illumination 21% Phase: Waxing Crescent; Moon at 5 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 281554 AFDREV

Area Forecast Discussion National Weather Service Reno NV 854 AM PDT Sat Mar 28 2020

UPDATE.

We have made some minor changes to the daytime forecast to delay the onset of widespread precipitation in northeast California and the Sierra until later this afternoon in line with the most recent high resolution models. We also increased snow levels just a bit due to this delay allowing for a bit more warming in the lowest layers of the atmosphere. That will limit the amount of snow in the higher elevations this afternoon . but overall amounts for tonight through Sunday were left largely unchanged.

SYNOPSIS.

A relatively weak, storm system will bring periods of light rain and snow this weekend with cool temperatures. For the rest of March, a warming trend is expected mainly from I-80 southward, but weak weather systems could bring a few showers and limit the warming for northeast California and northwest Nevada. A more notable warming trend looks more likely for the start of April.

PREVIOUS DISCUSSION. /Issued 300 AM PDT Sat Mar 28 2020/

SYNOPSIS .

A relatively weak, storm system will bring periods of light rain and snow this weekend with cool temperatures. For the rest of March, a warming trend is expected mainly from I-80 southward, but weak weather systems could bring a few showers and limit the warming for northeast California and northwest Nevada. A more notable warming trend looks more likely for the start of April.

SHORT TERM .

A weak trough of low pressure continues to be the main weather feature for this weekend as it moves from the northern CA coast today eastward to the Great Basin by late Sunday.

While a few sprinkles may reach far northeast CA this morning, the better chance for precip will arrive this afternoon-evening across the Sierra and far western NV, as a Pacific moisture tap and a weak but broad area of upper level divergence moves overhead. Without significant forcing, precip rates and amounts will be modest.

Later tonight, a weak upper disturbance continues to appear on several guidance sources, bringing a chance for slightly enhanced precip across parts of Mineral and Lyon counties, then pushing into eastern Churchill County for early-mid Sunday morning. Meanwhile, the main trough axis approaches the Sierra, bringing an increase in light snow coverage from western Lassen County southward along the Sierra crest during the day Sunday, while spotty areas of light rain reach far western NV.

By Sunday afternoon as the trough's cold pool aloft moves into west central NV, a bit more instability develops after the morning precip departs, which could lead to isolated lightning strikes and rain/pellet showers.

Overall forecast precip totals from this afternoon through Sunday evening continue to look rather light, with most areas of western NV and lower elevations of eastern CA receiving less than 0.10", except for portions of Mineral-Lyon counties and east of US-95 in Churchill County which could receive up to 0.25". Liquid precip totals could approach 0.50" along the Sierra crest.

As for snowfall, the Sierra crest and higher elevations of western Lassen County (and also higher elevations of western Mineral and southern Lyon counties) could receive between 2-5", with less than 2" at lake level in the Tahoe basin and along US-395 in Mono County. Some of this snow will fall during the day with accumulations less likely on roads, but slick conditions are likely to be encountered over the main Sierra passes and parts of the Tahoe basin late tonight through Sunday morning.

Leftover showers should wind down Sunday evening as the trough exits into eastern NV. However, another weak shortwave tracking into the Pacific Northwest could bring very light showers near the Oregon border Monday-Monday night, with some increase in winds (peak gusts 30-35 mph) from I-80 northward Monday afternoon- evening. Temperatures will finally approach seasonal averages in the lower 60s on Monday in western NV from I-80 southward, while farther north and in the Sierra valleys, highs in the upper 40s- mid 50s are expected. MJD

LONG TERM . Tuesday through next weekend .

We've made a few changes in the forecast, mainly to increase temperatures for next week into next weekend. The latest ECMWF and ensembles are coming into better alignment with the GFS/GEFS, showing a strong warm up next week as ridging builds over the West Coast.

A weak shortwave moves across the Pacific Northwest on Tuesday, bringing a chance of rain/snow to the far northern portions of our forecast area, mainly near the Oregon border. Precipitation will be meager, with only light QPF expected. Breezy winds will accompany this shortwave passage as well.

Temperatures will warm up sharply as we go into the second half of the week, with highs jumping into the upper 60s and even low 70s by Friday in western Nevada. Temperatures in the Sierra will rise into the upper 50s and low 60s. This warming trend will likely continue into next weekend, as the National Blend of Models (ensembles) are now coming into better agreement with the ridge placement along the west coast. -Hoon

AVIATION .

We will see increasing clouds with ceilings lowering from west- northwest to east-southeast. Precipitation is expected to move into northeast California as early as this afternoon then spread south and east through the overnight hours and early Sunday morning.

This precipitation will bring the attendant aviation concerns: MVFR/IFR ceilings/visibilities . mountain obscurations and icing concerns. Winds are not overly strong so turbulence may not be a concern. The only exception will be as the precipitation becomes more showery Sunday afternoon. Then turbulence could be more of a concern. We do also think there is enough instability for thunderstorms east of Highway 95 Sunday afternoon and early evening.

Snow accumulations Saturday and Sunday should be limited at the Sierra terminals . maybe 1-2 inches at best.

VFR conditions return for much of the area Monday into the middle part of the week. The only exception will be for locations north of a line from about KLOL to Portola There. we should see a series of weak shortwaves that bring low end chance for precipitation through the middle of the week. -Hoon

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, CA10 mi26 minN 010.00 miOvercast28°F19°F69%1020.3 hPa
South Lake Tahoe, Lake Tahoe Airport, CA20 mi18 minN 010.00 miOvercast31°F16°F54%1020.6 hPa

Link to 5 minute data for KTRK

Wind History from TRK (wind in knots)
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Last 24hrCalm--------W12W11
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W7SW8SW7W4CalmSE3CalmCalmE3CalmCalmCalmCalmCalmCalmCalmCalm
1 day ago--CalmN7------CalmN14
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E4W3CalmSE3SE3SE4CalmCalmCalmCalmCalmCalmCalm----Calm
2 days ago--SW14
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NW9------SW4W6W3CalmW4CalmCalmN4E3CalmCalmCalmCalmSE4CalmCalmCalmCalm

Tide / Current Tables for Sacramento, Sacramento River, California
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Tide / Current data from XTide NOT FOR NAVIGATION
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Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Sat -- 05:13 AM PDT     0.53 feet Low Tide
Sat -- 06:56 AM PDT     Sunrise
Sat -- 09:21 AM PDT     Moonrise
Sat -- 09:36 AM PDT     2.96 feet High Tide
Sat -- 06:24 PM PDT     0.19 feet Low Tide
Sat -- 07:26 PM PDT     Sunset
Sat -- 11:22 PM PDT     2.11 feet High Tide
Sat -- 11:41 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.11.71.310.70.50.71.32.22.82.92.82.421.510.60.30.20.30.61.31.82.1

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.
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Wind Forecast for Reno, NV (13,3,4,5)
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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 numerous 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.