Friday, December15, 2017 L-36.com


Marine Weather and Tides
Kirkwood, 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 7:10AMSunset 4:40PM Friday December 15, 2017 7:07 PM PST (03:07 UTC) Moonrise 4:40AMMoonset 3:22PM Illumination 5% Phase: Waning Crescent; Moon at 27 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 Kirkwood, CA
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location: 38.82, -120.06     debug


Area Discussion for - Reno, NV
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Fxus65 krev 152322
afdrev
area forecast discussion
national weather service reno nv
322 pm pst Fri dec 15 2017

Update
A lake wind advisory has been issued for lake tahoe and will be in
effect from 10 am Saturday through 10 pm Saturday. Expect
easterly to northeasterly winds gusting up to 35 mph through the
day on Saturday as the thermal gradient remains very tight behind
tonight's cold front. Waves will be highest on the west shore of
lake tahoe and will be capable of capsizing small watercraft.

Previous discussion issued 158 pm pst Fri dec 15 2017
synopsis...

a weak system moves through the region tonight increasing surface
winds and bringing improved air quality for the weekend. Some road
surfaces may be a little slick Saturday morning due to very light
snow accumulations. Otherwise, inversions are likely to
strengthen again early next week before a cold front moves through
for the middle of next week and breaks the inversions.

Short term...

changes to the forecast were minor. A weak slider-type system will
move through the region tonight through Saturday morning. Timing
remains unchanged; a brief and light pre-frontal band of
precipitation is expected late this evening and the frontal band
itself can be expected from around midnight through around dawn
this morning. This puts precipitation in the reno area
(rain rain-snow mix) around 10 pm this evening and again from
around 2-4am (predominantly snow).

Accumulations are expected to be very light area-wide with
generally a dusting to about a quarter of an inch. Still, even
this small amount will allow for slick conditions around the
region Saturday morning. Some favored upslope locations and areas
just downwind of lake tahoe and pyramid lake may see up to 1 inch
from a slight lake enhancement. The fast translational speed and
relative dryness of this system are the major limiting factors for
snow accumulations.

Winds shift northerly behind the system by late Saturday morning.

It will feel brisk out there with northerly flow switching
easterly and gusts around 15-25 mph. Ridging returns by Sunday
while flow remains easterly. Sierra crest winds will likely remain
quite gusty under this flow regime through early Sunday since the
thermal gradient remains tight.

Temperatures turn colder for the weekend with western nevada highs
struggling in the upper 30s and sierra valleys in the low mid 30s.

Overnight lows dip back to the upper teens low 20s with single
digits for colder sierra valleys as well as colder valleys in the
basin and range. Boyd
long term... Monday onward...

a weak amplitude ridge will be in place early next week which will
again provide dry conditions, light winds, and valley inversions.

However, models do continue to show a potential for a more potent
slider type system on Wednesday.

A strong cold front along with strong winds look to accompany the
slider through the northern sierra and western nevada on Wednesday.

The cold airmass behind the front should lower snow levels to all
valley floors by Wednesday afternoon with accumulating snowfall
possible. Models show good agreement in pushing this system through
the area, but as typical with slider systems, the uncertainty will
be with timing and intensity. Nonetheless, this system has been
showing good instability and frontal forcing along with more
moisture when compared to this weekend's system so travel impacts
could be a bit more widespread. This system is a fast mover and
should aid in limiting precipitation totals.

As this system departs, we will develop another period of gusty
northeast winds across the ridges by Thursday. These winds may
persist into next weekend as upper level ridging looks to build back
across the west coast. Unfortunately, the large scale pattern looks
to favorable a continued dry pattern as this ridge settles across
the region in a rex block set-up which would deflect the pacific
storm track away from the western u.S. Fuentes
aviation...

a cold front will sweep southeast across the area late tonight and
early Saturday morning and bring a few showers to mainly western nv.

Best shower coverage will extend from the basin and range
(knfl klol) into northeast nv with lesser coverage farther west
toward krno-kcxp-ktvl-ktrk. Only brief MVFR conditions are
expected with this fast moving band of showers. While significant
snow accumulations are not expected for area runways, a dusting of
snow to about a quarter of an inch is possible, especially on
exposed surfaces. For accumulations up to one inch... There is a
10% chance at krno kcxp southward to about kban along the eastern
sierra and about a 20% at klol knfl.

Ridge winds will stay gusty as the flow direction switches more
easterly by Saturday night. Expect mechanical turbulence over the
sierra down into the central valley of california. Hohmann boyd

Rev watches warnings advisories
Nv... Lake wind advisory from 10 am to 10 pm pst Saturday for lake
tahoe in nvz002.

Ca... Lake wind advisory from 10 am to 10 pm pst Saturday for lake
tahoe in caz072.

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, CA7 mi75 minSW 510.00 miFair45°F14°F29%1019.5 hPa

Wind History from TVL (wind in knots)
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Last 24hrS3S3S4S3S3S3S3CalmCalmS4CalmS5CalmCalmCalmNE3NE4NE6S8S105S6SW5Calm
1 day agoCalmSW3S4S353SW33SW4S43S3S4CalmS4CalmE3CalmNE4N3CalmCalmCalmCalm
2 days agoS3S3SW3S3S4S4S5S3CalmS6S3SW3S3S3NE4NE5CalmNE3NE7NE4CalmCalmCalmCalm

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Fri -- 12:54 AM PST     -0.10 feet Low Tide
Fri -- 04:45 AM PST     Moonrise
Fri -- 05:25 AM PST     2.24 feet High Tide
Fri -- 07:16 AM PST     Sunrise
Fri -- 12:13 PM PST     0.53 feet Low Tide
Fri -- 03:28 PM PST     Moonset
Fri -- 04:45 PM PST     Sunset
Fri -- 04:56 PM PST     3.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0-0.10.211.72.22.221.61.20.90.70.50.71.32.22.832.92.62.11.61.10.6

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

Fri -- 12:54 AM PST     -0.10 feet Low Tide
Fri -- 04:45 AM PST     Moonrise
Fri -- 05:24 AM PST     2.24 feet High Tide
Fri -- 07:16 AM PST     Sunrise
Fri -- 12:14 PM PST     0.53 feet Low Tide
Fri -- 03:28 PM PST     Moonset
Fri -- 04:45 PM PST     Sunset
Fri -- 04:56 PM PST     3.06 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0-0.10.311.72.22.221.61.20.90.70.50.71.42.22.83.12.92.62.11.61.10.6

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 (22,6,7,8)
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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.