Monday, May21, 2018 L-36.com


Marine Weather and Tides
Sunnyside-Tahoe City, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:39AMSunset 8:14PM Monday May 21, 2018 8:03 AM PDT (15:03 UTC) Moonrise 11:11AMMoonset 12:27AM Illumination 42% Phase: First Quarter Moon; Moon at 7 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 210912
afdrev
area forecast discussion
national weather service reno nv
212 am pdt Mon may 21 2018

Synopsis
An active pattern with chances for showers and storms continues this
week as low pressure slowly moves across the region. Periods of
heavy rainfall and small hail are possible in these storms. Showers
and storms decrease in coverage Thursday and Friday before another
low pressure system approaches and provides additional chances for
storms by the weekend.

Short term
The upper low was closing off as it dropped south through central
ca this morning and will be centered over the southern sierra by
00z this evening. This will result in bands of showers and
thunderstorms across the sierra and western nv with emphasis today
being south of i-80 and in particular the eastern sierra. Brief
heavy rain has already occurred with the stronger cells this
morning around fallon and mammoth lakes with some lightning
between fallon and fernley as of this writing.

Very little has changed with the track of the low, lifting it
slowly northward into eastern nv western ut by late Tuesday and
ejecting it to the northeast Wednesday as the next upstream
trough approaches the west coast. Chances for showers and storms
will spread farther to the north Tuesday before we see an overall
decrease in coverage Wednesday. While there will be fewer storms
Wednesday, plenty of instability will be present along with weak
steering flow aloft to promote very slow moving storms capable of
heavy rain local flash flooding.

Temperatures will be cooler today given the extensive cloud cover
and showers with more seasonal temperatures returning Wednesday.

Hohmann

Long term Thursday through Sunday...

the 21 00 utc numerical model guidance cycle saw fairly significant
changes to the evolution of the next low pressure area to affect the
region at the end of this week and into the weekend. Therefore...

fairly substantial changes were made to the inherited forecast.

Normally... We would be a little reluctant to make substantial
changes this far out... But the deterministic models and most
ensemble members are trending toward a more consolidated solution.

That is not to say there are not some differences... But these
differences are not as great as previous runs.

The GFS has started trending toward the previous ECMWF solution and
is now bringing the upper low closer to the california coast late
Thursday before driving it inland late Friday into Saturday. The
ecmwf has slowed a little this cycle and is a bit farther north
than the gfs... But overall they are close. The GEFS ensemble
members are in fairly good agreement as well.

Differences do arise Sunday as the GFS is slower to push the upper
low east and also maintains a mostly closed low. Meanwhile... The
ecmwf is lifting and opening the upper low as a trough more to the
northeast Sunday with better forcing moving into idaho.

So what does all this mean for the forecast? Well... Instead of
warming and drying for Thursday and Friday we have reintroduced
increasing pops for both days with the better coverage Friday. We
have also lowered temperatures and they are now more in line with
seasonal averages. For Saturday... If this solution holds... We are
likely to see more widespread showers and thunderstorms with
temperatures below normal. Highs may struggle to reach the lower 70s
in the western nevada valleys and the lower 60s in the sierra
valleys; potentially not the most pleasant start to the memorial day
weekend if you want warm and dry conditions.

For Sunday the forecast is a bit more uncertain given the divergence
in the track of the upper low. We will maintain some low end pops
over the far northern parts of the forecast area north of i-80 and
begin to let the temperatures drift back up as the low lifts out.

Timing could be everything Sunday. If the low is slower to lift out
the day will be cooler with a better chance of showers and
thunderstorms.

Aviation
Residual showers and a few thunderstorms early this morning are just
the precursor to an active day as an upper level low pressure closes
off just south of the forecast area and persists into Tuesday. This
will bring more widespread showers and a few thunderstorms to the
region today through Tuesday night. Bands of heavier showers are
likely to develop today that will result in lowered CIGS vsbys.

There is the likelihood of low level gusty winds near the stronger
thunderstorms along with small hail and turbulence.

Outside of the heavier showers and thunderstorms we should seeVFR
conditions... But near the showers and thunderstorms MVFR to
occasional ifr conditions are possible. Mountain obscurations are
also likely.

The same type of activity is likely for Tuesday before the upper low
fills and lifts away to the east-northeast. By Wednesday there
should be less convective coverage. Another low begins to make its
way onshore late in the week and could cause poor flying conditions
for the early part of the memorial day weekend.

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
Truckee-Tahoe, CA10 mi79 minN 010.00 miOvercast39°F37°F93%1014.6 hPa
South Lake Tahoe, Lake Tahoe Airport, CA20 mi71 minN 010.00 miLight Rain45°F43°F93%1010.1 hPa
Carson City Airport, NV22 mi69 minNE 310.00 miLight Rain52°F46°F82%1013.9 hPa

Wind History from TRK (wind in knots)
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Last 24hrCalmCalmN3SW3SW7SW10
G14
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SW8SW9W10W8S3CalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmNW4CalmNE3W4W14W13W10
G15
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W3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalm--CalmSE6NE6SW4SE6S5S5SE6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Sacramento, Sacramento River, California
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Sacramento
Click for MapNote: These data apply only during low river stages.

Mon -- 01:31 AM PDT     Moonset
Mon -- 01:34 AM PDT     2.42 feet High Tide
Mon -- 05:49 AM PDT     Sunrise
Mon -- 08:14 AM PDT     0.69 feet Low Tide
Mon -- 12:03 PM PDT     2.59 feet High Tide
Mon -- 12:17 PM PDT     Moonrise
Mon -- 08:16 PM PDT     Sunset
Mon -- 08:50 PM PDT     First Quarter
Mon -- 09:14 PM PDT     -0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.92.32.42.21.81.41.10.80.70.91.62.32.62.52.31.91.510.60.2-0.1-0.2-00.5

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Mon -- 01:31 AM PDT     Moonset
Mon -- 01:34 AM PDT     2.41 feet High Tide
Mon -- 05:49 AM PDT     Sunrise
Mon -- 08:14 AM PDT     0.68 feet Low Tide
Mon -- 12:03 PM PDT     2.58 feet High Tide
Mon -- 12:17 PM PDT     Moonrise
Mon -- 08:16 PM PDT     Sunset
Mon -- 08:50 PM PDT     First Quarter
Mon -- 09:13 PM PDT     -0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.92.32.42.21.81.41.10.80.70.91.52.32.62.52.31.91.510.60.2-0.1-0.2-00.5

Weather Map and Satellite Images
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wmap_P
GOES 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 (11,2,3,4)
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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.