Sunday, January21, 2018 L-36.com


Marine Weather and Tides
South Lake Tahoe, CA

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:12AMSunset 5:11PM Sunday January 21, 2018 4:50 AM PST (12:50 UTC) Moonrise 9:56AMMoonset 9:46PM Illumination 23% Phase: Waxing Crescent; Moon at 5 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 211135
afdrev
area forecast discussion
national weather service reno nv
335 am pst Sun jan 21 2018

Synopsis
Dry and cool conditions will prevail today with increasing clouds.

A weak disturbance may bring very light snow for parts of eastern
california tonight and Monday. A stronger and colder storm is
expected late Wednesday into Thursday, bringing more snow to the
sierra and possibly to lower elevations.

Short term
Flat ridge today will give way to a weak upper disturbance moving
across the pacific northwest, with a shallow feed of pacific
moisture pushing into northern ca tonight into Monday. The main
feature will be increasing amounts of cloud cover today through
Monday. Model guidance continues to indicate limited amounts of
precip pushing beyond the sierra crest, with most valley locations
of western nv and eastern ca unlikely to receive measurable
amounts of snow or rain.

Snowfall projections with this system continue to be sparse, with
only a couple inches or so near the sierra crest west of tahoe and
northward into far western lassen county, and 1 inch or less for
northeast ca and the tahoe basin below 7000 feet. Still, with this
light snow occurring overnight into Monday morning, there could
be a few slick spots so some caution is warranted for those
heading into and over the sierra.

Winds will also increase this afternoon and evening but this will
not be a significant wind event. Gusts could reach 35 mph north
of a susanville to gerlach line where valleys are more efficient
in channeling southerly flow, with peak gusts up to 65 mph
possible for sierra ridges. Elsewhere, wind gusts should generally
be 30 mph or less.

Most of the region should be dry Tuesday-Tuesday night and model
guidance has trended toward more ridging and backed off on warm
advection precip potential. This has been a steady trend so we
removed the precip chances except for retaining some slight
chances late Tuesday night north of susanville-gerlach ahead of
the next storm system. Cloud cover will be most widespread north
of i-80 while temperatures edge upward into the lower 50s for
most valleys along and south of i-80. Mjd

Long term Wednesday through next weekend...

attention continues to point to a cold winter storm that has had
decent model agreement the last several nights (only some minor
variation in timing and qpf). The storm is relatively cold and
more like a typical winter storm with snow levels starting around
lake level and then falling to valley floors as a strong cold
front moves across the area. The front and associated
precipitation will reach northeast ca and maybe the tahoe basin
Wednesday afternoon although the brunt of the storm is expected
Wednesday night, progressing quickly through the area by Thursday
morning. So the fast movement of the initial storm will limit
snowfall but it still looks like a decent amount with 12 to 18
inches along the sierra crest from western lassen county down to
mono county and 6 to 12 inches down into the tahoe basin. Lesser
amounts are expected down in lower elevations due to the fast
frontal movement, but some accumulation is possible behind the
front. The morning commute Thursday will be hazardous through the
sierra and possibly for lower elevations as well.

Ahead of this front, strong gusty winds are expected as 700mb flow
increases to 50+ kts and surface gradients tighten. Ridge level
winds will likely hit 100+ mph with gusts across valleys 40-55 mph
(stronger in wind prone areas). High profile vehicles and aircraft
will likely experience significant impacts Wednesday afternoon
through Wednesday evening. Good mixing will help push temperatures
well into the 50s across western nv with a few spots possibly
exceeding 60 degrees.

Cold and unstable conditions will persist Thursday through Friday
with isolated to scattered snow showers gradually waning. Some
model solutions bring a secondary wave through the flow late
Thursday which could being some enhanced snow shower activity and
possible slick road conditions. Temperatures will be below normal
with 30s and low 40s most locations. High pressure is progged to
build over the weekend for slowly warming temperatures and dry
conditions. Hohmann

Aviation
Vfr today as high pressure dominates aloft. Very dry air has
allowed for ktrk to remain fog free so far this morning although
some patchy freezing fog will be possible through 17z.

There will be considerable high clouds today ahead of a weak
system that will move across northern ca and northern nv tonight
and Monday. Precipitation will be sparse although a few snow
showers mainly north of i-80 could reach the tahoe basin and bring
brief periods of MVFR CIGS vsby in light snow 00z to 18z Monday.

Accumulation on runways at ktrk ktvl will be an inch or less.

While a few flurries are possible at krno kcxp, accumulation is
very unlikely.

Winds will increase across the ridges later today through early
Monday with gusts around 50-55 kts. Surface winds will generally
remain light although the gradient will be a bit stronger across
northeast ca and northwest nv, generally north of ksve-kwmc where
some gusts this afternoon evening could reach 35 mph. Hohmann

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 mi58 minS 310.00 miFair11°F7°F84%1026.3 hPa
Carson City Airport, NV24 mi56 minNW 410.00 miFair19°F14°F79%1024.7 hPa

Wind History from TVL (wind in knots)
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Last 24hrCalmCalmSW3CalmCalmCalmNE5NE5--4NE3CalmCalmCalmS3CalmS3S4S4S3S3S3S3S3
1 day agoS7S4SE6S4SW5S4S3S7S55S7CalmCalmCalmCalmS3S4S6S4S4S3S3CalmSW3
2 days agoSW7S11
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S10S9S7S9S8S9

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

Sun -- 05:04 AM PST     0.01 feet Low Tide
Sun -- 07:19 AM PST     Sunrise
Sun -- 10:01 AM PST     Moonrise
Sun -- 10:17 AM PST     2.57 feet High Tide
Sun -- 05:15 PM PST     Sunset
Sun -- 05:25 PM PST     0.69 feet Low Tide
Sun -- 09:20 PM PST     2.68 feet High Tide
Sun -- 09:52 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.30.80.40.100.20.81.62.32.62.52.321.51.10.80.70.81.32.12.62.62.4

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Sun -- 05:04 AM PST     0.01 feet Low Tide
Sun -- 07:19 AM PST     Sunrise
Sun -- 10:01 AM PST     Moonrise
Sun -- 10:17 AM PST     2.56 feet High Tide
Sun -- 05:15 PM PST     Sunset
Sun -- 05:25 PM PST     0.68 feet Low Tide
Sun -- 09:19 PM PST     2.67 feet High Tide
Sun -- 09:52 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.30.80.40.100.20.81.62.32.52.52.321.51.10.80.70.81.32.12.62.62.4

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Reno, NV (7,2,3,4)
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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.