Sunday, December15, 2019
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Marine Weather and Tides
Reno, 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 7:10AMSunset 4:37PM Saturday December 14, 2019 11:12 PM PST (07:12 UTC) Moonrise 8:17PMMoonset 10:31AM Illumination 87% Phase: Waning Gibbous; Moon at 18 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 Reno, NV
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location: 39.47, -119.78     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 150526 AAA AFDREV

Area Forecast Discussion . UPDATED National Weather Service Reno NV 926 PM PST Sat Dec 14 2019

UPDATE.

No changes to the forecast tonight. Light snow was falling in the northern Sierra and across northeast CA/northwest NV mainly north of I-80. Latest satellite and radar imagery were showing an enhanced area of convection moving toward the northern Sierra (Plumas, Sierra and Nevada Counties) probably along the cold front/trough and associated forcing. This enhanced precipitation has the best promise of bringing a burst of snow to the Reno- Carson City over the next several hours (especially between 10 PM and 1 AM) with 1-4 inches. Further east in the Basin and Range, finer scale models continue to show light accumulations with local bands of heavier 2-4 inch amounts possible. This will likely effect I-80 from Reno to Winnemucca as well as US-50 and US-95 in the vicinity of Fallon. Current advisories and statements cover the impacts well. Hohmann

PREVIOUS DISCUSSION. /Issued 211 PM PST Sat Dec 14 2019/

SYNOPSIS .

A cold front will bring light to moderate snow down to all valley floors this evening into early Sunday morning. A break in the wet pattern is anticipated for early next week before the next storm arrives. A weak storm or two are possible for the second half of the week, and a stronger storm might impact holiday travel next weekend.

SHORT TERM .

A cold front will bring light to moderate snow to the eastern Sierra and western NV. The snow should develop in northeast CA and the Sierra as far south as Alpine County late this afternoon into this evening, and then spread across western NV late this evening through Sunday morning. Gusty winds will continue across Mono County at least through late this evening, with peak gusts generally up to 30 mph except ridgetop winds up to 50 mph.

The upper wave accompanying the cold front tonight is not strong and snowfall should be light in general; however, northwest to southeast snow bands will bring good potential for moderate snow. Because of this banding, some locations may see a skiff of snow while others could receive 2 to 5 inches. There is also potential for a sudden onset of snow (a convective snow burst) bringing rapidly degrading road conditions and visibilities.

Where are these snow bands most likely to develop? The latest high-resolution models still are not in agreement on just where these snow bands will develop and persist. However, the most likely zone for these narrow bands to develop is south of a Portola to Lovelock line and north of a South Lake Tahoe to Fallon line. The Reno-Sparks and the Tahoe Basin could be in this zone, including I-80 over Donner Pass. As these snow bands extend eastward to east of highway 95, lighter snow amounts are expected. Nonetheless, slick road are likely tonight east of highway 95 as well, including around Fallon, NV and along I-80.

Temperatures will cool rapidly tomorrow evening as skies clear with low temperatures tomorrow night in the teens to low 20s for western NV, and down to the single digits for many Sierra valleys. JCM

LONG TERM .

Monday Onward .

* Valley inversions are the main deal early in the week. Light E/NE flow combined with warming temps aloft should yield limited ventilation for lower elevation valleys Monday and Tuesday. Not the strongest inversion scenario we've seen, but especially if we get snow to strengthen nighttime cooling, some impacts from haze and pollutant buildup are possible.

* Weakening wave looks to bring a few light showers to the Sierra Wednesday afternoon and evening but this storm has trended toward being less and less of an impact. Should kick up the winds, at least on the ridges and maybe into the valleys for some better ventilation.

* Now we get into the fun part. Overall storm trends for our region have decreased for Thursday-Friday but increased for next Saturday and Sunday. Confidence in the forecast Thursday onward is lower than average due to big variations in simulations vs a day or two ago.

* Landfalling AR/jet has trended north for Thursday-Friday yielding light precip mainly west sides of Plumas and Lassen Counties, with locally gusty winds and warming temps elsewhere. Most of ensemble guidance shows this scenario, however ~10% of members still show a round of heavier precip for more of our region so will need to monitor. The higher probability for winter storm conditions is now Saturday-Sunday with trough approaching the west coast. Leaning more toward Sunday in latest deterministic simulations. Looking to be more of a typical winter storm setup with mountain and foothill snow, valley rain to snow, and gusty winds. It's the weekend before Christmas so that will greatly amplify the impact to travel from any winter precip.

* No major storm signals for the week of Christmas at this point however weak-moderate storms do remain on the table. Most ensemble members show precip at some point Christmas week, just varying on timing. I think most of us (even me) wouldn't mind a little snow "down here" for Christmas week, and that's still a possibility.

-Chris

AVIATION .

A cold front will move through Northeast CA into the Great Basin late this afternoon through tonight. Snow will develop and organize into northwest to southeast bands bringing another round of MVFR/IFR conditions along with mountain obscurations. Probabilities for a period of MVFR/IFR conditions are about 10% at KMMH, 60% at KLOL, KNFL and KCXP, and 70-80% at KRNO, KTVL and KTRK.

Ridgetop winds continue to increase this afternoon and will remain strong overnight with gusts 35-45 kts. KMMH will have peak gusts up to 30kts this afternoon through at least late evening. Winds will be lighter overall for terminals outside Mono County. However, occasional convective gusts up to 30 kts are possible at any terminal this afternoon through late this evening. JCM

REV Watches/Warnings/Advisories. NV . Winter Weather Advisory until 4 AM PST Sunday NVZ002-003-005.

CA . Winter Weather Advisory until 4 AM PST Sunday CAZ071-072.



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, NV3 mi17 minW 510.00 miMostly Cloudy35°F28°F78%1010.3 hPa
Reno/Stead, NV15 mi37 minW 41.50 miLight Snow30°F28°F93%1010.8 hPa
Carson City Airport, NV19 mi37 minN 01.75 miLight Snow32°F30°F93%1010.8 hPa
Truckee-Tahoe, CA22 mi37 minSW 37.00 miLight Snow28°F26°F93%1010.8 hPa

Link to 5 minute data for KRNO

Wind History from RNO (wind in knots)
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1 day agoS4E7NE7N8NE6CalmE3CalmNW4NW5W8W5S7S15
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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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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 (2,6,7,8)
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Ground Weather Radar Station Reno, NV
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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.