Thursday, April26, 2018 L-36.com


Marine Weather and Tides
South Lake Tahoe, CA

Version 3.4
What's New / NOTES
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.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:05AMSunset 7:49PM Thursday April 26, 2018 2:05 AM PDT (09:05 UTC) Moonrise 3:31PMMoonset 3:39AM Illumination 84% Phase: Waxing Gibbous; Moon at 11 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 South Lake Tahoe, CA
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location: 38.91, -120.01     debug


Area Discussion for - Reno, NV
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Fxus65 krev 260057 aaa
afdrev
area forecast discussion... Updated
national weather service reno nv
557 pm pdt Wed apr 25 2018

Update
00z krev sounding shows a cap is still present around 600 mb and
cumulus development has been sparse and quite flat around the
tahoe basin. A buildup shower has developed on the west side of
the sierra of mono county and this area has the best chance of
seeing an isolated cell this evening. We have dropped the mention
of thunder for the tahoe basin this evening but kept it in south
of markleeville. Hohmann

Synopsis
Warm afternoon temperatures are expected through Thursday with a
cool down to below average temperatures by the weekend.

Thunderstorm potential increases for the sierra on Thursday
afternoon spreading into western nevada by evening. Conditions
become breezy for Friday through Sunday with a chance for showers
as a low moves across the area.

Previous discussion issued 140 pm pdt Wed apr 25 2018
synopsis...

warm afternoon temperatures are expected through Thursday, with a
cool down to below average temperatures by the weekend. A few late
day showers or thunderstorms are possible near the sierra through
this evening. Thunderstorm potential continues for the sierra on
Thursday, but also spreads into western nevada. Conditions become
breezy for Friday through Sunday with a chance for showers as a low
moves across the area.

Discussion...

spring weather has arrived. Not only are we getting the warmer
temperatures and light winds, but along with that comes the
increased potential for thunderstorms. While we have had a handful
of storms in the southern sierra, there hasn't been much action
across western nevada and tahoe quite yet. Tomorrow is shaping up to
be that first decent thunderstorm day. With that in mind we urge
folks to include a method of getting to safety if thunderstorms
form, especially if you have outdoor plans tomorrow afternoon and
evening. This type of thunderstorm day this early in the season may
catch people off guard, so be sure to spread the word, especially
for the sierra and far western nevada for the thunderstorm
potential.

Today: with afternoon temperatures warming into the low 80s for
western nevada and high 60s to low 70s for the sierra, we are
forecasting thunderstorm development across the sierra. With little
to no steering flow for this afternoon-evening, any storms that
develop should remain along the higher terrain of the sierra.

Thursday: thunderstorm potential spreads and increases across the
area for Thursday afternoon as the cut off low approaches northern
california. Daytime surface heating along with forcing from a weak
wave associated with the low off the coast will result in more
thunderstorms for Thursday. Most storms should be relatively weak
and brief, but we can't rule out a stronger storm that shifts off
the higher terrain into the warmer valleys. Typical threats with
thunderstorms anticipated- hail, strong winds, and lightning.

Friday: the main portion of the upper level wave from the low will
swing through late Thursday into early Friday which may allow storms
to persist overnight, especially for areas north of highway 50 and
across the basin and range. Don't be surprised if you hear thunder
rumbling through during the predawn hours Friday. Winds will also
pick up on Friday afternoon, with gusts generally around 35 mph for
western nevada and around 45 mph for more wind prone areas. This
will be a concern for aviation interests, those in high profile
vehicles, and those planning on heading out onto area lakes.

Weekend (including the fishing opener for mono county): by
Saturday the upper low moves across northern ca and western nv
bringing widespread cooler conditions and the potential for
showers. There are still some differences in the details, but if
you are outdoors plan on it being 10-15 degrees cooler with
increased chances for showers. Areas above 6000 feet may even see
some snow Saturday afternoon and evening. Yep, snow. Best chances
for that will be in northern lassen county for now. There are also
slight chances for thunderstorms, with the best instability
mainly north of interstate 80. A few showers may linger into early
next week along with temperatures remaining below normal, but
confidence remains low in these details.

-edan
aviation...

main aviation threats will be isolated thunderstorms for sierra
terminals this afternoon. Chances of thunderstorms spread into
western nevada for Thursday afternoon with the potential for gusty
outflow winds. Winds increase area-wide with gusts around 30
knots by Friday and with ridge-tops approaching 70 kts; turbulence
can be expected. Other threats will be mountain obscurations and
the potential for brief ifr MVFR mainly for sierra terminals
during showers or thunderstorms.

Conditions trend colder and more showery over the weekend, but an
isolated thunderstorm cannot be ruled out. With temperatures
cooling, some snow pellet showers will also be possible.

-johnston boyd

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
South Lake Tahoe, Lake Tahoe Airport, CA1 mi72 minN 010.00 miFair42°F37°F82%1018.9 hPa
Carson City Airport, NV24 mi70 minN 010.00 miFair50°F28°F43%1020.7 hPa

Wind History from TVL (wind in knots)
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Last 24hrS3CalmCalmS4S3S3CalmNE4NE7N63NE7--56NE5CalmCalmCalmS3CalmCalmCalmCalm
1 day agoSW3CalmCalmS3S3CalmCalmNE46Calm34N6N4N7N3CalmCalmCalmS4CalmSW3S3S3
2 days agoS4S3S4CalmS3CalmNE3NE746N5N10
G16
5--3NE5CalmCalmCalmS546S6S3

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

Thu -- 12:39 AM PDT     -0.08 feet Low Tide
Thu -- 04:44 AM PDT     Moonset
Thu -- 05:31 AM PDT     2.80 feet High Tide
Thu -- 06:14 AM PDT     Sunrise
Thu -- 01:04 PM PDT     0.22 feet Low Tide
Thu -- 04:37 PM PDT     Moonrise
Thu -- 05:25 PM PDT     2.51 feet High Tide
Thu -- 07:53 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0-00.41.32.12.72.82.52.11.61.10.70.40.20.51.222.52.52.21.81.40.90.5

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Thu -- 12:39 AM PDT     -0.08 feet Low Tide
Thu -- 04:44 AM PDT     Moonset
Thu -- 05:31 AM PDT     2.79 feet High Tide
Thu -- 06:14 AM PDT     Sunrise
Thu -- 01:04 PM PDT     0.22 feet Low Tide
Thu -- 04:37 PM PDT     Moonrise
Thu -- 05:25 PM PDT     2.50 feet High Tide
Thu -- 07:53 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0-00.41.32.12.72.82.52.11.61.10.70.40.20.51.222.42.52.21.81.40.90.5

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 (5,6,7,8)
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Ground Weather Radar Station Reno, NV
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weather_mapweather_map weather_map

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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.