Thursday, March21, 2019

Marine Weather and Tides
Topaz, 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 7:00AMSunset 7:13PM Thursday March 21, 2019 4:28 AM PDT (11:28 UTC) Moonrise 8:13PMMoonset 7:44AM Illumination 100% Phase: Full Moon; Moon at 15 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 Topaz, CA
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location: 38.67, -119.53     debug

Area Discussion for - Reno, NV
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Fxus65 krev 211001
area forecast discussion
national weather service reno nv
301 am pdt Thu mar 21 2019

Lower valley rain and mountain snow showers will slowly dissipate
today as low pressure exits the region. Another storm moves in
Friday bringing light snow accumulations down to 5000 feet by
Saturday morning. After a brief break on Sunday, another storm is
possible by Monday with gusty winds, valley rain, and mountain
snow heading into the middle of next week.

Short term
Weak area of low pressure continues to slowly move across the region
early this morning. A deformation zone rotating around the low has
produced a light precipitation band across for portions of western
nevada through much of the night and early this morning. These
showery conditions will continue through today, but the better
chances for showers will deviate southward as the low shifts. High
resolution simulations continue to show the best chances for more
widespread showers across mineral and southern mono counties through
the early afternoon. Later in the afternoon, there will be sufficient
heating and moisture for slight chances of thunderstorms, especially
across the basin and range areas. We certainly can't rule out some
pea-size hail and localized heavier showers.

After a short break Thursday afternoon through early Friday, the
next system pushes into the region Friday afternoon. This storm
pushes through fairly quickly, but will bring another round of snow
to the sierra. While snow levels start out relatively high (~7000
feet), colder air works into the region by Saturday morning with
snow levels dropping down to near 5000 feet. While there may be some
light rain and snow in western nevada, the highest precipitation
amounts will be confined to the sierra, particularly from alpine
county southward. If you have travel plans across the sierra this
weekend, plan for some snow accumulation near the passes Saturday
morning. While accumulations will be lighter at lower elevations,
roads may still be slick Saturday morning so take caution and slow
down. Temperatures will also remain fairly chilly on Saturday
behind the cold front, with highs running about 10 degrees below
average. -edan

Long term Sunday into next week...

unsettled weather for much of next week
main change to adjust down precipitation chances late Monday night
through Tuesday afternoon. Forecast uncertainty is moderate to high,
especially Monday through Tuesday night, as simulations differ
substantially with how far south an upper disturbance and an
associated cold front will get.

After a dry and quiet Sunday with seasonable temperatures, unsettled
weather is expected for much of next week. As mentioned, forecast
uncertainty rises sharply between Monday and Tuesday night. This
revolves around the position of a lead upper wave moving out of a
large eastern pacific trough on Monday. The gfs, with its farther
south upper wave, advances a cold front to near the i-80 corridor by
Monday evening while the ec keeps the front over far northeast ca
and northwest nv. This results in approximate precipitation amounts
of 2 to 2.5 inches near the tahoe crest Monday and Tuesday in the
gfs, with 0.5 inches at best in the ec. In addition, with the front
hanging up farther north in the ec, travel impacts due to
northern central sierra and northeast ca snow vary greatly. The gfs
would bring impacts Monday and Tuesday, especially overnight and in
the morning, while the ec would bring mostly trouble-free travel
conditions to the main tahoe passes.

For western west-central nv and mono county Monday and Tuesday,
impact uncertainty is much lower as precipitation amounts are much
less in simulations and it looks like mainly rain for major travel
routes. Of more concern is wind on Monday along and east of highway
395 and along and south of i-80. Those areas could see substantial
impacts due to aviation turbulence and dangerous winds for high-
profile vehicles. As wind strength is usually at least somewhat
uncertain in the lee of the sierra due to mountain wave interactions
too subtle to discern this far out, just consider this a heads up
for now if you have travel plans Monday.

Moving beyond Tuesday afternoon, simulations appear to come back
closer together as the main upper trough off the california coast
comes inland and pushes colder air into the region. With continued
moist flow off the pacific, this will increase the threat for travel
headaches over the sierra and in northeast california between
Tuesday night and Thursday, especially during the overnight and
morning hours when roads will likely be cold enough for snow to
accumulate. For western nv, periodic snow showers could bring
troubles as well, especially above lower valley floors overnight.


Main concern this morning for the sierra and western and west-
central nevada is MVFR conditions (mainly cigs) and terrain
obscuration as a deformation axis has formed up overnight.

Precipitation is mainly rain below about 5200-5500 feet msl, with
light snow above that. Any snow accumulation at ktrk ktvl this
morning should remain very light.

The deformation axis rain and snow is expected to mostly dissipate
this morning, with additional isolated to scattered showers
developing this afternoon with daytime heating and weak instability.

A few thunderstorms are possible, mainly east of a gerlach to
fernley to hawthorne line. Any storms will be weak with very small
hail or snow pellets and occasional lightning.

Tonight into Friday will bring a brief break before the next system
brings additional terrain obscuration, mountain snow, and valley
rain and snow late Friday afternoon into Saturday. A fairly modest
snowfall is possible for sierra terminals, with little or no
snowfall for lower valley (krno kcxp kmev knfl klol) terminals.


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, CA30 mi35 minN 01.50 miLight Snow Fog/Mist32°F30°F92%1014.6 hPa

Wind History from TVL (wind in knots)
Last 24hrNE4NE333CalmCalmSW7SW4S13
1 day agoCalmCalmCalmS4S4NE5NE8NE8NE644SE3--N3CalmSW5
2 days agoCalmS3S3S4CalmCalmNE6NE8N8N7NE4NE4CalmN6CalmCalmCalmCalmS3S3S3CalmCalmCalm

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 (7,2,3,4)
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Ground Weather Radar Station Reno, NV
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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.