Sunday, March7, 2021
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Marine Weather and Tides
South Lake Tahoe, CA

Version 3.4
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1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:21AMSunset 6:00PM Sunday March 7, 2021 3:46 AM PST (11:46 UTC) Moonrise 2:49AMMoonset 12:12PM Illumination 36% Phase: Third Quarter Moon; Moon at 23 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 South Lake Tahoe, CA
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location: 38.91, -120.01     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 062251 AFDREV

Area Forecast Discussion National Weather Service Reno NV 244 PM PST Sat Mar 6 2021

SYNOPSIS.

Breezy winds, average temperatures, and clear conditions are expected for the remainder of today as low pressure exits the region. After a quiet Sunday, a pattern change to more active weather is likely with cooler temperatures, breezy to gusty winds, and periodic chances for rain and snow for much of this coming week.

SHORT TERM.

Besides for some post-frontal, breezy west winds, conditions have improved quite a bit from earlier this morning when a dynamic cold front pushed through the region. Southwest gusts were impressive overnight accompanying the frontal passage. Most of the region experienced gusts in the 40-50 mph range for an hour or two with the more wind prone areas (Mono County and portions of Hwy 395) in the 50-70 mph range. As for snowfall, minimal amounts were reported with a general 3-4 inches across the ski resort areas in the Tahoe Basin.

Quieter weather day for Sunday across the Sierra and western Nevada with strengthening high pressure towards the east and incoming low pressure off the Pacific Northwest coast. This synoptic pattern keeps a more compressed pressure gradient resulting in another round of breezy afternoon winds from the west-southwest. Daytime temperatures are forecast to peak a few degrees above average with highs reaching in the low 60s for western Nevada, about 10 degrees warmer than the Sierra communities should be at this time.

Conditions begin to deteriorate late Sunday night with increasing cloud cover from north to south and a pick up in Sierra ridge gusts as a longwave trough and cut-off upper-level low pressure system begins to migrate southward from the Gulf of Alaska. For Monday, a slight increase to POPs was made for western Lassen County and along the Sierra, but overall confidence remains low in terms of QPF/snow amounts. According to the recent NBM snow probabilities, there is a 25% chance for greater than 4" of snow for Donner Pass and a 25% chance for greater than 2" for South Lake Tahoe by Tuesday morning with most of western Nevada shadowed out during this time.

The more notable weather for Monday looks to be the gusty southwest winds across the region as confidence has increased this afternoon in potentially stronger winds. As of now, short range model guidance suggests an upper-level jet max positioning itself over the Sierra and extending into western Nevada as the low pressure system digs southward off the west coast. According to the GFS and its ensemble, the jet looks to be its strongest during the afternoon into the evening hours of Monday . optimal mixing time. This could allow those stronger upper-level winds to mix down to the surface during this time. As it stands now, 700 mb flow isn't too impressive with gusts in the 30-50 kt range, so not anticipating any damaging winds at the moment, but it is something we will have to keep our eye on. The majority of the wind gust ECMWF ensemble members for the Tahoe area have gusts peaking in the 40-50 mph range with a few over 50 mph. Western Nevada is a tad lower in terms of intensity with most members around 40-45 mph for the Reno Airport. -LaGuardia

LONG TERM. Tuesday through the end of next week .

Models continue to favor a more westward track for low pressure Tuesday through Thursday night. The current projected trajectory off the California coast suggests moderate accumulations of snow along the Sierra crest with error bounds trending towards lower totals. Forecast QPF/snow amounts remain unchanged with 6-12 inches possibly accumulating for the High Sierra west of Lake Tahoe and 3-8 for higher elevations in Mono/Alpine counties. Lower elevations of the Sierra range 1-3 inches, but daytime snow will most likely not contribute much to accumulations considering the higher March sun angle. Placement of the low also suggests lighter winds, so no strong surface winds are expected for next week, but aviation turbulence will become more likely.

The biggest question remains around the potential for deformation banding Wednesday night through Thursday along the Sierra Front. Deterministic GFS is trending with ensemble guidance showing a more progressive exit of low pressure while EC favors a slower moving system. Again, daytime snow will likely not accumulate due to the snow angle, so there is less than 25% chance of 1 inch along the Sierra Front at this time even if deformation forms during the day on Thursday.

With the more westward trajectories presented in models, temperatures should run around 5-8 degrees below seasonal averages, but could trend cooler if the low's track shifts eastward. Conditions should be drier for next weekend in the low's wake with longer range models showing potential for another trough dropping down the Pacific coast. Boyd

AVIATION.

Breezy northwesterly winds to continue for the remainder of the afternoon with general gusts peaking around 20 kts. Expect winds to become light later this evening at all area terminals. Have added a chance of some patchy fog to form for KTRK mainly from 07Z-17Z Sunday given the recent precipitation, clear sky conditions, and calm winds.

VFR conditions for Sunday are anticipated with typical breezes and clear to partly cloudy skies. Additional winter weather could affect aviation interests Monday through Wednesday or possibly Thursday the week ahead. -Dawn/LaGuardia

REV Watches/Warnings/Advisories.

NV . Lake Wind Advisory until 7 PM PST this evening for Pyramid Lake in NVZ004.

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
South Lake Tahoe, Lake Tahoe Airport, CA1 mi54 minN 010.00 miFair23°F20°F88%1016.9 hPa
Carson City Airport, NV24 mi52 minN 010.00 miFair28°F19°F69%1017.6 hPa

Link to 5 minute data for KTVL

Wind History from TVL (wind in knots)
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2 days agoCalmS5S7SW4S4NE3S6N86
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NE10NE9--64CalmCalmCalmS3CalmCalmCalmCalmS5S4

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Sun -- 02:46 AM PST     2.22 feet High Tide
Sun -- 02:54 AM PST     Moonrise
Sun -- 06:28 AM PST     Sunrise
Sun -- 08:53 AM PST     0.89 feet Low Tide
Sun -- 12:19 PM PST     Moonset
Sun -- 01:23 PM PST     2.94 feet High Tide
Sun -- 06:05 PM PST     Sunset
Sun -- 11:02 PM PST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.62.12.22.11.81.41.10.90.91.21.82.52.92.92.82.521.61.20.80.40.10

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Sun -- 01:37 AM PST     2.22 feet High Tide
Sun -- 02:53 AM PST     Moonrise
Sun -- 06:28 AM PST     Sunrise
Sun -- 07:23 AM PST     0.89 feet Low Tide
Sun -- 12:14 PM PST     2.94 feet High Tide
Sun -- 12:19 PM PST     Moonset
Sun -- 06:05 PM PST     Sunset
Sun -- 09:32 PM PST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.72.12.221.71.310.911.42.12.72.92.92.72.41.91.510.60.300.10.5

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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