Saturday, August15, 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 6:12AMSunset 7:57PM Saturday August 15, 2020 4:34 AM PDT (11:34 UTC) Moonrise 1:23AMMoonset 4:46PM Illumination 12% Phase: Waning Crescent; Moon at 26 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 150939 AFDREV

Area Forecast Discussion National Weather Service Reno NV 239 AM PDT Sat Aug 15 2020

SYNOPSIS.

Showers and thunderstorms can be expected each afternoon through the middle of next week. Hot temperatures are forecast for the weekend and next week. Heat impacts are likely for sensitive groups and those with limited cooling options for their homes.

SHORT TERM.

Lots to chat about early this morning with heat and thunderstorms the two big concerns this weekend.

Showers and thunderstorm might be a bigger issue each day as instability builds through the weekend. There is a decent moisture feed from the south as the Sierra and western NV are stuck between the ridge over central/eastern NV and a trough off the California coast. In this pattern, thunderstorms should initially develop over the Sierra then push off into western NV with the light zephyr breezes each afternoon. Waves of energy may quickly pass with each moisture surge leaving the door open to the potential for strong thunderstorms and even some late night/early morning activity starting Sunday night. Bottom line here is to be prepared to change your outdoor plans. Strong storms will be able to produce winds gusts over 50 mph, hail and periods of heavy rain. Flash flooding and debris flow threat appears to be rather low due to a 10-15 mph storm motion, though any slower moving storms could easily drop a burst of heavy rain.

Heat could also lead to some health impacts for sensitive groups and those with limited cooling options. If you have outdoor plans also be prepared for the heat, definitely carry extra water, if you are going to be outside for several hours. Afternoon highs will approach 100 degrees for the NV valleys, though cloud cover may keep temperatures below 100. Highs in the Sierra up near 90 are not of the question as well. Overnight lows in population centers may not dip much below 70, leaving little time to cool homes at night.

Did go with a dense smoke advisory for this morning for the actively burning Loyalton Fire. Expect smoke to settle into the Sierra Valley around Chilcoot, Loyalton, Vinton this morning. Some smoke may drift into the Reno-North Valleys and perhaps as far west as Portola and Graeagle. Waiting on the early morning VIIRS pass to initialize the fire for the smoke dispersion models. Expect a bit more detailed smoke forecast later today. Brong LONG TERM. Tuesday onward .

No major changes were made to this forecast cycle. Our focus remains on how long the heat will stick around our area as an anomalously strong ridge looks to remain over the Intermountain West through most of next week.

* Heat: The major headline for the long term is how long the heat will endure for our region. Deterministic and ensemble model guidance is in consensus that Tuesday will be the hottest day across the Sierra and western Nevada as the 597 decameter contour arrives overhead at the 500 hPa level. Afternoon highs Tuesday through next Saturday will be in the upper 90s to low 100s for western Nevada valleys and upper 80s to around 90 in Sierra valleys. Radiational cooling will be limited Tuesday and Wednesday morning with the presence of subtropical moisture over our region. This prolonged period of well above normal daytime highs and overnight lows will create heat-health impacts for vulnerable populations and those outdoors for prolonged periods. Make sure to limit your outdoor exposure and understand the symptoms of heat- related illness. The good news is that a strong Gulf of Alaska trough looks to near the Pacific Northwest and Canadian Pacific coast next weekend, which may allow temperatures to cool back in the direction of normal.

* Thunderstorms: Another persistent leitmotif in the forecast is the continued potential for thunderstorms each afternoon and evening through next Thursday mainly along the Sierra and Sierra Front. Minor changes in thunderstorm coverage could occur on one or more of these days as mesoscale vorticity maxima pivot around the periphery of the ridge allowing for cooling aloft and improved chances for convective initiation. Subtropical moisture will continue to stream into the region around the perimeter of the Intermountain West ridge through at least Thursday. Storms look to be of the hybrid variety with the increased PWAT; however, as we saw yesterday, lightning strikes outside of cores could start new fires, especially given the receptive nature of the very dry fuels. Report any new fires and smoke to local emergency personnel. As the center of the 500-hPa ridge begins to move south and east late next week, the associated influx of subtropical moisture will also move with it, causing thunderstorm chances to shift south and east by next weekend. Afternoon cumulus castellanus will still be possible over the High Sierra and White Mountains of southern Mono County Friday.

* Winds: Expect typical zephyr breezes through next week with gusts to around 20-25 mph each afternoon. We will likely see intensified afternoon winds and heightened fire weather concerns depending on when the Gulf of Alaska trough moves into the Pacific Northwest region, which at this time looks to be next weekend. -Johnston

AVIATION.

Showers and thunderstorms to develop daily this weekend between 20z-04z. For Today thunderstorms should be limited to areas from roughly KRNO-KTRK southward to Mono/Lyon/Mineral Counties. Outflows 35-45 kts, small hail, and brief heavy rain are possible with the stronger storms.

Thunderstorm chances for terminals today and tomorrow . KRNO: 25% - 30% KCXP: 25% - 35% KMEV: 30% - 35% KTRK: 20% - 30% KTVL: 25% - 30% KMMH: 30% - 35% Smoke and haze from the Loyalton Fire may limit visibility around the Sierra Valley, and Stead Airport today depending on fire activity. Brong

FIRE WEATHER.

The combination of heat and thunderstorms are the main concern this weekend. We're stuck between a low off the California coast and High Pressure over eastern Nevada. This will allow moisture to continue to move into the region with a daily trend of showers and thunderstorms building over the Sierra by mid afternoon, then pushing into western NV as the light zephyr breezes kick in. Storm motion will be about 10-15 mph which will limit rainfall. Gusty outflows of 40 mph or more area also possible this weekend.

One note for the Loyalton fire today, the heat, moisture, and instability are a very favorable set-up for pyrocumulus and perhaps pyrocumulonimbus development in the presence of active fire behavior.

Simulations are starting to show some potential for overnight showers and thunderstorms this weekend as well. Overnight instability appears minimal tonight, so perhaps just some virga or very light showers. Sunday and Monday nights appear more favorable. Brong

REV Watches/Warnings/Advisories. NV . None. CA . Dense Smoke Advisory until noon PDT today CAZ071.



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 mi60 minN 010.00 miFair52°F41°F67%1026.4 hPa
South Lake Tahoe, Lake Tahoe Airport, CA20 mi42 minS 410.00 miFair51°F44°F77%1020.7 hPa
Carson City Airport, NV22 mi40 minN 010.00 miFair66°F44°F46%1023 hPa

Link to 5 minute data for KTRK

Wind History from TRK (wind in knots)
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Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Sat -- 02:29 AM PDT     Moonrise
Sat -- 03:48 AM PDT     3.11 feet High Tide
Sat -- 06:20 AM PDT     Sunrise
Sat -- 01:36 PM PDT     0.07 feet Low Tide
Sat -- 05:49 PM PDT     Moonset
Sat -- 06:28 PM PDT     2.31 feet High Tide
Sat -- 07:59 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.62.333.132.82.41.91.410.60.30.10.10.51.21.82.32.32.11.71.41.1

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
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Sat -- 02:30 AM PDT     Moonrise
Sat -- 02:39 AM PDT     3.11 feet High Tide
Sat -- 06:21 AM PDT     Sunrise
Sat -- 12:06 PM PDT     0.07 feet Low Tide
Sat -- 05:19 PM PDT     2.31 feet High Tide
Sat -- 05:49 PM PDT     Moonset
Sat -- 07:59 PM PDT     Sunset
Sat -- 10:53 PM PDT     1.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.533.132.72.21.71.30.80.50.20.10.20.71.422.32.321.61.31.11

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 (7,2,3,4)
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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 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.