Friday, October30, 2020
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Marine Weather and Tides
Portola, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:25AMSunset 6:02PM Friday October 30, 2020 8:49 AM PDT (15:49 UTC) Moonrise 4:59PMMoonset 5:28AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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 Portola, CA
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location: 39.82, -120.47     debug


Area Discussion for - Reno, NV
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FXUS65 KREV 300931 AFDREV

Area Forecast Discussion National Weather Service Reno NV 231 AM PDT Fri Oct 30 2020

SYNOPSIS.

High pressure will prevail over eastern California and western Nevada for the upcoming week. Above average high temperatures will continue through the middle of next week, with seasonably cool nights. Winds will remain generally light with no rain or snow expected.

SHORT TERM.

Relatively quiet weather the next few days as high pressure over the southwest continues to strengthen. A shortwave brushing by to the north will create some breezy winds near the Oregon border, up to 20-25 mph, with some increase in fire weather concerns (see fire weather section). Unfortunately with the southwest flow, Mammoth will likely see smoke impacts from the Creek Fire again today.

Clear skies and warm afternoons are expected the next few days with well above normal high temperatures in the low to mid 70s. However, very dry air across the region will allow overnight temperatures to fall to near normal, with low 20s in mountain communities and low to mid 30s in western Nevada valleys.

A weak area of low pressure is forecast to move into southern Nevada/California over the weekend with the main impact expected to be increased cloud cover on Sunday, mainly south of highway 50. -Zach

LONG TERM.

Overall the forecast will be in somewhat of a holding pattern for much of early next week with mild afternoon temperatures and chilly mornings. Late next week the forecast holds a bit more interest as the next trough approaches the Pacific Northwest. Ensemble and deterministic solutions are still pushing a strong cold front through the region Friday into Saturday. The most likely scenario at this time will be for a significant drop in temperatures from Friday to Saturday as well as a burst of winds. While this trough will likely bring the winds and cold across the Sierra and western Nevada, the prospect for precipitation remain less certain. While there is a small chance for a wetting rain (less than 10% in Reno for now), the wind forecast does bear monitoring through the upcoming week. If the strong winds and dry conditions come to fruition, then we will be prepping for another round of critical fire conditions across the region. For additional fire concerns see the fire weather discussion below. -Edan

AVIATION.

Generally light winds through this morning. Primary concern will be areas of smoke and haze from the Creek Fire into Mammoth and KMMH regions. Smoke or haze will be possible into the there by midday today into the afternoon, as simulations show a light southwesterly wind picking up. Primarily VFR conditions are expected, but may be periods of MVFR.

A trough pushing through the Pacific Northwest will enhance winds across far northern Nevada and along the Oregon border this afternoon and evening. Areas from SVE-WMC northward can expect this increase in breezes starting this afternoon. Mountain waves downwind of the Warner Range are possible. Otherwise, all other TAF locations, including Reno-Tahoe can plan for a slight increase in W/NW breezes this afternoon.

Lighter winds and clear conditions resume for the weekend with excellent visibility and VFR forecast for all TAF sites. -Edan

FIRE WEATHER.

A trough and its cold front will drop through the Pac NW today and increase the winds this afternoon and evening. Primary area of concerns will be along the Oregon border in zones 270 and 458. Plan for a few hours of near-critical winds and dry conditions, but it likely will be isolated to the typically windy parts of those zones. Coverage and duration won't be enough to warrant any warnings at this time.

Looking ahead, long range simulations are trending toward the next storm for late next week that could bring fire weather issues to the region. Simulations are still hitting on Friday 11/6 for potentially critical winds for the region. Much colder air and a chance for wetting rain showers will come with this storm as well, but the prospects for wetting rain showers are pretty low confidence for now.

-Edan

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/Stead, NV33 mi55 minN 010.00 miFair23°F5°F46%1024 hPa

Link to 5 minute data for KRTS

Wind History from RTS (wind in knots)
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Last 24hrCalmCalm3SE6SE4E6E6SE5E6E9N3N5CalmN6CalmN4CalmN4N4CalmNW4CalmCalmNW3
1 day agoCalmCalmSE4SE5SE6E5SE4E6E7E6N3CalmN5N4W5N5CalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmE5SE4
G10
SE5SE76E6E7NE4W3CalmCalmNW4NW4N4CalmN4CalmCalmNW4CalmNW4N3

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS 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
Ground Weather Radar Station Reno, NV
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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 numerous 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.