Friday, August18, 2017

Marine Weather and Tides
Reno, NV

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 6:14AMSunset 7:51PM Friday August 18, 2017 2:53 PM PDT (21:53 UTC) Moonrise 2:49AMMoonset 5:37PM Illumination 12% Phase: Waning Crescent; Moon at 26 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 Reno, NV
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location: 39.47, -119.78     debug

Area Discussion for - Reno, NV
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Fxus65 krev 181009
area forecast discussion
national weather service reno nv
309 am pdt Fri aug 18 2017

Thunderstorms remain a possibility each day through the middle of
next week. Storms this afternoon will again be mainly over the
sierra, potentially becoming more widespread this weekend into
early next week but predictability remains about average. Flash
flooding will become more of a threat late this weekend and into
early next week. Temperatures through the weekend will remain
above normal with weak afternoon breezes each afternoon.

The main story over the weekend will be mid to upper 90 degree
heat across western nevada (mid 80s for sierra valleys) along
with increasing chances for thunderstorms across the sierra.

The favored location for storms will again be across the northern
sierra this afternoon were there is some modest increases in
moisture transport and instability. Storms motions are a little
tricky around the region as we will be centered in a col region.

This means storms across the northern sierra are expected to stay
along the crest with a slow southwest drift while any formation
across western nevada could see storm motions slowly drift
eastward. Nonetheless, the slower storm motions may result in
isolated areas of heavy rainfall with gusty outflow winds

Coverage looks better heading into Saturday and Sunday as an
upper level shortwave trough digs southwest and begins to filter
in more moisture across the region. So far the most favorable
areas for showers and storms again will be across the sierra and
far western nevada as these ares will see southeast transport
which will increase moisture and help initiated storms across
elevated terrain. Also, these storms may not see the instability
and forcing that is expected by early next week, but the moisture
increase will begin to ramp up our threat for flash flooding.

Those with outdoor plans, particularly in the sierra should
closely monitor the forecast for updates on thunderstorm
potential. Fuentes

Long term Monday and beyond...

looking busy next week with an eclipse, thunderstorms, increased
flash flood risk, and then ending with drier and breezy conditions.

The biggest question on the minds of many is the cloud cover
forecast for the solar eclipse Monday morning. Latest forecast
trends would suggest at least partly cloudy skies from remnant
thunderstorm debris, with odds about 60 percent. How much will this
impact the eclipse viewing is unknown as that will be highly
dependent on the exact position of the clouds in the sky at the time
of the eclipse, and that is nearly impossible to forecast. We'll
continue to monitor the eclipse forecast and be sure to keep you up
on the latest details.

Otherwise, the large scale pattern for the early part of the week
features an area of low pressure sitting off the southern california
coast. This brings increased south to southeast flow to the eastern
sierra and western nevada helping to advect modified monsoonal
moisture northward. This will bring an increased coverage in
thunderstorms to the region Monday with Tuesday looking especially
interesting. On Tuesday, the low pivots, taking on a negative tilt
off the coast, with increasing upper level divergence aloft. Pwats
rise to around 0.8-0.9", which climatologically lends itself to
increased flash flood risk, especially given the light steering

Wednesday also could be another very active thunderstorm day as
upper level lapse rates increase, but there is one caveat. Pwats are
forecast to increase to 1-1.2", and frequently when they get that
high we start to cloud over and can't realize the full instability
potential. This may be a wait and see type day where it could go big
or it may end up cloudy, cool, and showery with embedded isolated

Heading into the end of the week, the low off the southern california
coast weakens and is absorbed into the large scale flow as a
stronger area of low pressure dives through the pacific northwest.

This will bring drier westerly flow to the region and increased
afternoon breezes. There may be enough lingering moisture and
instability across central nevada eastward for thunderstorms to form
on Thursday and with the increased shear, it may help bring some
organization to the storms. By Friday and into the weekend, storm
chances look minimal if not non-existent. -dawn

Greatest threat for aviators will be isolated showers and
thunderstorms this afternoon, mainly along the sierra and western
nevada sierra front. Storms are likely to form after 21z today,
dissipating between 03-05z. Brief periods of heavy rain, gusty and
erratic outflow winds can be expected with lesser chances for a hail
threat. Localized terrain obscuration is a concern along with short
periods of MVFR-ifr conditions under the rain core of the storms.

There is a 20 percent chance of a shower or thunderstorm impacting
kmmh, ktvl, an ktrk with a 10 percent chance for krno and kcxp.

Thunderstorm chances and coverage will increase through the weekend
and into the first half of next week.

Otherwise, expectVFR conditions over the weekend with afternoon
westerly breezes of 10-15 kts. If it rains at ktrk, the airfield is
likely to see fog develop overnight into the early morning hours. -

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
Reno, Reno Tahoe International Airport, NV3 mi58 minN 010.00 miA Few Clouds94°F34°F12%1013.6 hPa
Reno/Stead, NV15 mi58 minSE 710.00 miFair90°F30°F12%1022.7 hPa
Carson City Airport, NV19 mi58 minWSW 510.00 miFair93°F32°F11%1021 hPa
Truckee-Tahoe, CA22 mi58 minN 010.00 miPartly Cloudy82°F33°F17%1024.4 hPa

Wind History from RNO (wind in knots)
Last 24hrE53Calm6NE4NE9W8W5CalmW4CalmW5SW4W3CalmW3CalmCalmCalmCalm33NW4Calm
1 day agoN8Calm4
2 days agoE3CalmN8W12W10W9NW7NW8NE5N4NW5CalmW3W3NW4W4W4W4CalmCalmSE43N55

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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Weather Map
IR Satellite Image from GEOS

GOES Local Image of CentralWestCoast    EDIT

Wind Forecast for Reno, NV (17,4,5,8)
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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.