Saturday, August8, 2020
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Marine Weather and Tides
Kirkwood, CA

Version 3.4
NOTICE
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 6:06AMSunset 8:04PM Saturday August 8, 2020 5:22 AM PDT (12:22 UTC) Moonrise 9:59PMMoonset 9:53AM Illumination 79% Phase: Waning Gibbous; Moon at 19 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 081051 AFDREV

Area Forecast Discussion National Weather Service Reno NV 351 AM PDT Sat Aug 8 2020

.SYNOPSIS…

Isolated afternoon and evening thunderstorms are possible this weekend near the Sierra with storms spreading into western Nevada and northeast California early next week. Drier conditions return later next week. Temperatures will remain quite warm through Monday and then cool to more seasonal levels next week.

.SHORT TERM…

Thunderstorms on Friday afternoon and evening were generally confined to the eastern Sierra from Alpine County and northern half of Mono County northward across the Tahoe Basin and Plumas County. A lone cell popped up in Carson City, otherwise western NV was absent of thunderstorms.

For this weekend, the chance for thunder will decrease as the deformation zone associated with the upper low drifting off the CA coast south of Monterey will no longer be positioned over the Sierra. What’s left over in the Sierra are terrain-induced convergence, residual moisture and increased heating, but no organized forcing. While we will keep a slight chance of thunder near the crest in Alpine and Mono Counties today, steering flow from the east could push the activity west of the crest. On Sunday, the steering flow becomes very weak and cells are more likely to remain near each side of the crest. Farther north, some cumulus buildups could produce brief cells around the Truckee and Tahoe areas each afternoon, although this potential looks less favorable compared to Friday.

On Monday, a weak disturbance moving across northern CA will bring an increased chance of thunder not only near the Sierra, but also for northeast CA with cells spreading into portions of western NV generally west of US-95 by late afternoon and evening.

Thunderstorms through Sunday are likely to be the pulse type with short life cycles (up to 30 minutes) and slow storm motions. The main threat looks to be brief heavy rainfall which could impact burn areas or bring rapid temperature drops in the Sierra. Monday’s cells could potentially be stronger and last longer, with hail and stronger outflow winds in addition to heavy rain threat. Of course, lightning is always a threat for lake and other outdoor recreation. So give yourself enough time to get off lakes and to shelter if you notice strongly building clouds. If you wait until a thunderstorm develops, it may be too late!

Temperatures through Monday will rise above average with highs in the 90s to around 100 for lower valleys and solid 80s for most Sierra valley. Overall, Sunday looks to be the warmest day. MJD

.LONG TERM…Tuesday and beyond…

Only minor adjustments were made this morning as medium range guidance continued to show a trough swinging through the Pacific Northwest Tuesday. Some of the guidance is a bit farther south with the westerlies which would push convection out of the Tahoe Basin as early as Tuesday and all areas by Wednesday. However, ensemble guidance still supports another day of storms Tuesday with the main focus along the Lassen County convergence from northern Lassen County into Northwest Nevada and from the eastern Sierra of Mono- Alpine Counties into western NV. Increasing mid level flow and focus along low level convergence would promote stronger storm cells with heavy rain, hail and strong outflow winds. In addition, lightning would continue to bring the threat of new fire starts outside of the main cores.

For Wednesday-Friday, a drier westerly flow will follow. We maintained the slight chance of thunderstorms south of Highway 50, mainly in Mineral and far eastern Mono Counties as some guidance continues to be a bit slower in drying up the instability. Drier air and an increase in the afternoon/evening zephyr could bring enhanced fire weather concerns from the Sierra Front northward should there be any new fire starts or holdovers from storms earlier in the week. Temperatures will cool a few degrees but latest guidance keeps afternoon readings near or slightly above seasonal norms for mid August. Hohmann

.AVIATION…

Isolated thunderstorms will be confined mainly to the Sierra Crest from Tahoe southward today and Sunday with about a 10% chance of a storm affecting KTRK-KTVL-KMMH 21Z-03Z. Storm coverage looks to be a bit less today than we saw Friday afternoon. Storm chances increase Mon-Tue as a trough approaches the region. Outside of outflows, winds the afternoon zephyr will be below average with most gusts around 15 kts. Temperatures will be pushing mid to upper 90s western NV valleys and mid 80s Sierra this weekend. So expect some thermal bumps and some enhanced density altitude issues. Hohmann

FIRE WEATHER.

* Storm coverage has trended down to more isolated through Sunday and mainly the Sierra high country and crest from Mammoth to Truckee. New fire starts are possible along with strong outflows but coverage appears minimal. Storms are slow moving so rainfall amounts up to 1" are possible under the isolated cores.

* Main concern is Monday-Tuesday where calibrated t-storm guidance is painting more widespread storms affecting the Sierra, NE California, and far W Nevada. Still a ways out but this period could have more of a new fire start and strong outflow impact. Fuels are getting quite dry with recent warm/dry spells so ignition efficiency with any lightning likely to be high.

* There are early indications in ECMWF ensemble guidance that next Wednesday, a much drier airmass will move in along with enhanced westerly breezes. Could be a critical wind/humidity setup especially Sierra Front northward into NW Nevada and NE California. This scenario following a couple t-storm days could be problematic from a lightning holdover fire perspective.

-Chris

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, CA7 mi29 minS 310.00 miFair47°F44°F90%1017.6 hPa

Link to 5 minute data for KTVL

Wind History from TVL (wind in knots)
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Last 24hrS3S5S4SE3NE7Calm355
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2 days agoS3S3S3CalmCalmS7--S95564
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Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Sat -- 06:14 AM PDT     Sunrise
Sat -- 06:35 AM PDT     0.67 feet Low Tide
Sat -- 10:30 AM PDT     2.49 feet High Tide
Sat -- 10:59 AM PDT     Moonset
Sat -- 06:32 PM PDT     0.18 feet Low Tide
Sat -- 08:08 PM PDT     Sunset
Sat -- 11:04 PM PDT     Moonrise
Sat -- 11:44 PM PDT     2.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.62.421.61.20.90.70.71.222.42.52.321.61.10.70.40.20.20.61.42.12.6

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Sat -- 05:05 AM PDT     0.67 feet Low Tide
Sat -- 06:14 AM PDT     Sunrise
Sat -- 09:21 AM PDT     2.49 feet High Tide
Sat -- 10:59 AM PDT     Moonset
Sat -- 05:02 PM PDT     0.18 feet Low Tide
Sat -- 08:07 PM PDT     Sunset
Sat -- 10:35 PM PDT     2.65 feet High Tide
Sat -- 11:04 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.31.91.410.80.70.91.52.12.52.52.31.91.40.90.50.30.20.40.91.72.32.62.6

Weather Map
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wmap_P
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.
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Wind Forecast for Reno, NV (8,2,3,4)
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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.