Thursday, December13, 2018

Marine Weather and Tides
Lee Vining, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:01AMSunset 4:44PM Thursday December 13, 2018 12:07 AM PST (08:07 UTC) Moonrise 12:35PMMoonset 11:35PM Illumination 32% Phase: Waxing Crescent; Moon at 6 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 Lee Vining, CA
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location: 37.96, -119.13     debug

Area Discussion for - Reno, NV
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Fxus65 krev 122314
area forecast discussion
national weather service reno nv
314 pm pst Wed dec 12 2018

Clear skies will allow for cold temperatures tonight and a return
of valley inversions Thursday. A system will bring light higher
elevation snowfall for northeast california, with gusty winds for
lower elevations, on Friday. Another system late Sunday could bring
higher elevation snow with travel impacts for northeast california
and the sierra. Quiet, dry weather is expected to persist for some
time after Monday.

Short term
A front moved through the region early this morning and mixed out
the lower valleys. Most locations in the lower valleys of western
nevada are currently about 10 to 15 degrees warmer than this time
yesterday! Quite a big jump in temperatures with a "cold front"
that moved through the region. The reason for this temperature
bump was the mixing out of the cold valley air that has been
trapped by inversions over the last week.

Clear skies will allow for maximum radiational cooling tonight
and into Thursday morning, with low temperatures into the teens
and low 20s tonight. These cold temperatures tonight will get the
valley inversions in place again for Thursday, aided by warming
temperatures aloft. We lowered the high temperatures for
Thursday's forecast as less mixing and stronger inversions will
keep the valleys from warming up like we did today.

Another frontal system will move through the region on Friday,
bringing strong winds across much of the region. Latest model
guidance is suggesting gusty winds across all elevations, but
especially for the sierra ridges and along wind prone areas in
western nevada and northeast california. 700mb winds increase to
near 60-65 kts, with downslope wind potential along the us-395
corridor from susanville to bridgeport. This is a southerly wind
setup for the region, affecting certain areas more than others.

Some of these areas include the reno-tahoe airport, pleasant
valley hidden valley, spanish springs, north east of peavine
mountain in cold springs stead, and south lake tahoe. South wind
events historically create hazardous wind shear conditions for the
reno airport, most likely Friday morning. Dangerous boating
conditions are also expected Friday on area lakes including tahoe
and pyramid lake.

As for moisture, this storm will be on the dry side with only a
few hundredths of precip in the sierra from tahoe north. It's
possible we could see a couple inches of snow around donner pass
and west of susanville in lassen county, but otherwise minimal
accumulations. -hoon

Long term Sunday and beyond...

later Sunday into Monday may be the last chance for notable
precipitation (more on that below) for quite some time as a large-
scale upper ridge develops over california, nevada, and the
southwestern CONUS next week. Long-range moisture projections from
the GFS ensemble show minimal chance for substantial moisture
transport precipitation for northeast ca and western nv from the
18th through the 27th. That is not to say there couldn't be weak
systems by christmas week, just nothing major to beef up the
snowpack or area precipitation totals.

Back to the Sunday evening to Monday system, it still shows signs of
weakening elongating as it moves into the sierra. In addition,
simulations also have shown a tendency to slow down slightly,
especially in the GFS simulations. The elongation and slower timing
concept makes sense as the system will be approaching a developing
longwave ridge over the rockies and eastern great basin.

What does all that mean? We still expect moderate amounts of rain
and snow in the sierra and across northeast california. However, for
western and west-central nv it gets more uncertain as a weakening,
more disorganized system would tend to have precipitation break up
into showers as it moves past the sierra. For that reason,
precipitation chances remain modest (slight chance to chance) for
western and west-central nevada Sunday night and Monday morning.

Still, a light sierra and northeast ca (above 5000-5500 ft) snowfall
remains on the table Sunday night; therefore, be prepared for winter
driving conditions if traveling over the sierra crest after dark

The weather turns quiet after Monday as high pressure builds into
the region. With no substantial cold push behind the Sunday Monday
system, temperatures near or slightly above normal should prevail
next week. -snyder

Vfr conditions prevail through Thursday night as high pressure
builds over northeast ca and western nv.

The next system for Friday will be a wind maker with gusts 35-45 kts
for the terminals in and just east (to the highway 395 and i-580
corridor) of the sierra, with considerably less wind for west-central
nv including knfl, klol, and khth. Mountain wave turbulence will be
present over and east of the sierra as ridge winds gust to 90 kts.

Also, areas of llws will be possible for areas that favor more
southerly flow events, including ktvl and krno. Local experience
has shown that south flow causes numerous llws reports for the
runway 16 approach into krno.

As far as precipitation late Sunday into Monday, the bulk of the
rain and snow (above 5000-5500 ft) currently looks to remain in
northeast ca north of the tahoe area. Tahoe terminals may see some
snow showers but accumulations are expected to be minimal.


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
Mammoth Yosemite Airport, CA28 mi72 minN 010.00 miFair20°F11°F67%1027.1 hPa

Wind History from MMH (wind in knots)
Last 24hrN3SE9SE8S4
1 day agoW9N3NW5W7CalmN4N4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3CalmCalmCalmCalmCalm
2 days agoE8N5CalmSE5SE6CalmCalmCalmN5SE3E4NW4CalmE6CalmCalmCalmCalmCalmNW5NW6CalmW6W8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Reno, NV (3,6,7,8)
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Ground Weather Radar Station San Joaquin Valley, CA
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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 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 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.