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 7:07AMSunset 4:36PM Tuesday December 10, 2019 4:21 PM PST (00:21 UTC) Moonrise 4:48PMMoonset 6:25AM Illumination 99% 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 Spanish Springs, NV
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location: 39.67, -119.53     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 102258 AFDREV

Area Forecast Discussion National Weather Service Reno NV 258 PM PST Tue Dec 10 2019

SYNOPSIS. A weak weather system will sweep through overnight. It will bring very light snow showers to the mountains this evening through Wednesday morning, but little accumulation is expected. A stronger weather system may impact the region by the end of the week into the weekend with a mix of rain, snow and winds possible.

SHORT TERM. Light winds, inversions, and poor mixing will be the story through the remainder of the day today before a weak system pushes through the region late tonight and early Wednesday morning.

Winds will continue to increase across the Sierra ridges overnight as the system approaches Northern CA/NV. Sierra ridge wind gusts are in the 30s mph range for now, but they may reach gusts between 50 to 60 mph.

Precipitation will be light with this system with maybe a dusting of snow across the Sierra with a very low chance of amounts measured in inches through Wednesday morning. Primary concern with the light rain/snow showers will be the potential for slick, icy road conditions Wednesday morning. For the lower valleys in western Nevada, there may be some light rain showers through early tomorrow morning.

Sierra ridge winds will remain gusty on Wednesday and mix down to lower valley locations on Thursday. The winds will help to promote better ventilation and decrease the risk of air pollutants building up in the valleys. The improved mixing will also allow the temperatures to warm into the mid to high 50s, which is pretty warm for this season.

Winds will ramp up noticeably early Thursday morning for the Sierra ridges as the next waves of a storm approach. The onset of this storm will be interesting as much of the Sierra and western Nevada will remain on the southern (warm) side of the incoming upper level jet. Although there is a moisture tap along with this storm, the snow levels will be quite high initially. Plan for mainly light rain below 7500-8000 feet for Thursday night into Friday morning. The bigger impact with this storm, at least initially, will be the gusty winds, with ridge wind gusts approaching 80-90 mph and valley winds between 35 to 45 mph, with wind prone & foothills wind gusts up to 50 mph. -Edan

. LONG TERM . Friday through Tuesday .

Moist onshore flow will continue Friday into Saturday with around an inch of QPF possible along the Sierra crest and a few light to moderate showers in western Nevada.

For most of the event, the Sierra will be on the warm side of the jet stream keeping snow levels relatively high to start. Cold air is expected to eventually move in from the north, but most of the precipitation is expected ahead of the front. Snow levels will start around 8000 feet early Friday and drop to down to near Nevada valley floors by Sunday. Travel impacts will be possible for Sierra passes from Friday evening through Saturday night. Snow accumulations are forecast to be in the 6-12" range above 7500-8000 feet. For elevations between 6000-7500 feet, rain is expected to turn to snow on Saturday with up to a few inches possible near Lake Tahoe level. Precipitation is going to be mainly focused in the central Sierra with only 0.2-0.4" of QPF down to the Mammoth area.

A secondary cold front is possible late Saturday night. This could drive accumulating snow down to western Nevada valley floors, which could bring some snow impacts to the lower elevations, however this feature has lower predictability this far out. Either way, accumulations would most likely be light.

Much cooler temperatures are expected for the start of next week with high temperatures in the valleys only reaching the upper 30s to low 40s Sunday into Monday.

Atmospheric River tools are showing signals of another round of moisture impacting the region around the Dec 19th-22nd time frame. It's too early to forecast the strength or snow levels of this moisture influx, but since it starts to get into Christmas travel timeframe, it's worth noting. If you have trans-Sierra travel planned during that time period, keep an eye on the forecast. -Zach

AVIATION.

A weak system moves in tonight into Wednesday bringing light snow along with the return of lower ceilings obscuring terrain. While the rain and breezy winds with this system may help to disperse fog at KTRK later this evening, low visibility and ceilings may persist due to snow showers sweeping through late tonight into Wednesday morning. 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. -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 mi27 minN 010.00 miMostly Cloudy48°F30°F50%1021.6 hPa
Reno/Stead, NV18 mi47 minESE 410.00 miFair45°F26°F49%1022 hPa

Link to 5 minute data for KRNO

Wind History from RNO (wind in knots)
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Last 24hrW4W6W3W7W5W4W3CalmS4CalmCalmCalmCalmCalm3CalmCalm3CalmCalmCalm4CalmCalm
1 day agoNW5NW3NW4CalmCalmN3NW6SW4CalmSW4W5NW3W433S4CalmSE3CalmCalm3CalmCalmCalm
2 days agoS7SW11W8SE9CalmCalmSW6NE6NW4CalmCalmE4NE4CalmS4CalmCalmCalmCalmCalm4Calm4NW8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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 (19,4,5,8)
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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.