Tuesday, December10, 2019
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Marine Weather and Tides
Spanish Springs, NV

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 7:06AMSunset 4:36PM Monday December 9, 2019 11:19 PM PST (07:19 UTC) Moonrise 4:14PMMoonset 5:22AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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 Topaz, CA
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location: 38.67, -119.53     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 092303 AFDREV

Area Forecast Discussion National Weather Service Reno NV 303 PM PST Mon Dec 9 2019

SYNOPSIS.

A quiet weather pattern will be in place over the next couple of days as high pressure builds across the region. A weak weather system may bring very light snow showers to the mountains from late Tuesday into Wednesday but little accumulation is expected. A stronger weather system could affect the region the end of the week into the weekend.

SHORT TERM.

Quiet cloudy beginning to the morning, but most of the low clouds have cleared out this afternoon. Some areas like the Martis and Sierra Valleys will be contending with fog and low clouds tonight through tomorrow morning, but hopefully will clear out by midday tomorrow.

As high pressure returns briefly, valley inversions will be the primary impact through Tuesday with bases around 6000-6500 feet. Limited valley mixing and ventilation may have some impacts to air quality. Winds will remain light everywhere (valleys & ridges), but westerly winds will be on the increase across Sierra ridges starting tomorrow ahead of the next (weak) system.

This weak system will quickly pass through Tuesday night through Wednesday and may bring some light snow showers to the Sierra. Accumulations will be very light (a dusting - an inch range) in the Sierra along with some breezy winds. Roads may become slick after the storm passes through Wednesday, but overall a pretty low impact storm.

Thursday will be quite mild for mid-December ahead of the next incoming system with highs in the valleys in the mid to high 50s. Winds will begin to increase again early Thursday morning for the Sierra ridges as the next storm makes its way towards the West Coast. -Edan

LONG TERM. Thursday night onward .

The main features late week through next weekend will be:

* "Warm" moisture tap with rain and high elevation (above all main passes) snow Thursday and much of Friday, especially in the Sierra north of Mono County, and north of Highway 50 in the Basin.

* Colder conditions with a disturbance between late Friday night and Saturday night (uncertain timing), bringing the potential for increasing snow impacts for the Sierra and a possible light snowfall for lower elevations.

Moisture transport/AR tools continue to show a decent moisture feed moving over the region as far south as the Reno-Tahoe area Thursday and Thursday night. However, forcing on the moisture plume still looks anemic with the main forcing remaining well north over Oregon. Therefore, precipitation rates/amounts with the plume will depend mainly on orographic forcing with the highest rates likely to remain near the Sierra crest from about Alpine County north, and perhaps across far northeast California. In any event, snow levels will be quite high given the warmer moisture source; no impact is currently expected through Friday over the main Sierra and northeast CA (Hwys 36/44) passes.

Late Friday night and Saturday, snow levels are expected to fall off as a cold front sags into the area from the north. This will bring increasing chances for some snowfall impacts to travel in the Sierra and northeast California. There is also a low confidence for impacts from light snow into the lower elevations of western Nevada on Saturday, with uncertainty in the strength of forcing (varying system strength in simulations) and duration of light snow with the front remaining fairly progressive.

Following the weekend system the forecast gets quiet for a few days as high pressure builds overhead; however, the flow remains progressive (i.e. stagnant conditions not expected). Ensemble guidance is hinting at chances for another storm around Dec 19-20, 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, which makes sense if you assimilate Murphy's Law into the equation. -Snyder

AVIATION.

Dense fog and low clouds have cleared out of most areas this afternoon. Martis valley and KTRK are the "lucky" ones that are still dealing with the low visibility/ceilings this afternoon and likely through tomorrow morning. There is a low probability that fog returns to some colder valleys tomorrow morning, probably a 30% chance. High pressure will keep light winds and poor mixing around through Tuesday.

The next weak storm system will move into the region Tuesday night into Wednesday bringing light rain and snow along with the return of lower ceilings obscuring terrain. Winds will increase along the ridges late Tuesday, but surface winds will remain very light through this storm so there may be some shear and turbulence concerns.

-Edan

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
Reno, Reno Tahoe International Airport, NV17 mi25 minW 310.00 miA Few Clouds32°F27°F82%1025.1 hPa
Reno/Stead, NV18 mi45 minN 010.00 miFair27°F24°F93%1024.4 hPa

Link to 5 minute data for KTVL

Wind History from TVL (wind in knots)
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Last 24hrS4CalmCalmS5S3CalmS3S3CalmS5S4CalmCalmNE5NE3N3CalmCalmS3S3S4S5S4Calm
1 day agoS7S9S85SE8CalmS7SW4S9CalmS8S6S4CalmCalmCalmCalmS3CalmS3S3S3S3S5
2 days agoSW10
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Tide / Current Tables for
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Tide / Current Tables for
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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 (2,6,7,8)
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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.