Wednesday, May27, 2020
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Marine Weather and Tides
Tahoma, 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 5:36AMSunset 8:17PM Wednesday May 27, 2020 12:05 AM PDT (07:05 UTC) Moonrise 8:59AMMoonset 11:55PM Illumination 26% Phase: Waxing Crescent; Moon at 5 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 Tahoma, CA
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location: 39.03, -120.28     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 262203 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 303 PM PDT Tue May 26 2020

Synopsis. High pressure will continue to bring hot temperatures to the region along with a moderate to high heat risk through Thursday. A pattern change is expected on Friday, which will lead to cooler temperatures and chances of mountain showers and thunderstorms over the weekend.

DISCUSSION. Northern CA remains under a 585 dm ridge. This is bringing another hot day with current valley temps in the mid 90s to just over 100. These temps are running about 2 to 6 degrees warmer than yesterday this time and we should see highs top out a few degrees warmer than yesterday. A short wave trough digging through BC is helping to bring some high clouds to the northern part of the area but these clouds will have little to no impact on temps this afternoon. The high clouds will slowly push south this evening but will mainly dissipate by the time they reach the Sacramento area. Little to no delta breeze is expected this evening/overnight and overnight lows are going to bring only little relief from the heat as we see them fall into the mid 60s to lower 70s tonight.

Hot temperatures are going to continue on Wednesday and Thursday as we remain under the ridge. We will see increased Delta flow starting Wednesday and especially on Thursday. This will help to bring slightly cooler highs to Delta influenced areas but it will only be a few degrees.

With the prolonged heat in the forecast, the general population should take precautions to prevent heat related illnesses given the potential for moderate to very high heat risk. Stay hydrated, limit outdoor activities, and check on sensitive groups. If you plan on enjoying the outdoors, be sure to practice heat safety and a cold water safety if visiting area waterways. Area waterways continue to run very cold and fast, and precautions should be taken if heading to the water.

A closed off upper level low currently spinning about 1150 miles off the coast of the Baja of CA will bring changes to our weather on Friday as it pushes toward NorCal. We will see the start of a cooling trend with valley highs falling back into the 90s. The forcing will be on the weak side for Friday but we do see some instability build in generally above 500 mb. This will bring a slight chance for t-storms in the higher elevations during the afternoon and evening with better shower chances into the weekend. Soundings are dry below 500 mb and are inverted V type. This could lead to low precip t-storms with gusty winds. Right now the t-storm threat overall looks low for Friday.

-CJM

EXTENDED DISCUSSION (Saturday THROUGH Tuesday). Early Saturday morning, the well advertised closed low will be offshore of the San Francisco Bay Area with impressive heights running around 558 dm. Per ensemble output from the NAEFS, 500-mb height anomalies are likely to run in the 2 to 2.5 standard deviation below average range. Spread is interestingly quite low in the ensemble spaghetti plots with a track just off the coast or through north- central CA. This dynamic system will enhance shower chances accompanied by a risk for elevated thunderstorms on Saturday morning into the afternoon, including over the Sacramento Valley. Lifted indices drop below zero indicative of the level of instability accompanying this upper low passage. Any forming showers and thunderstorms will lift northward with the mean steering flow. Given the time of year, some of these showers may initially struggle to produce much precipitation which will limit rainfall amounts. Once the higher-resolution models capture this time period, more details of coverage and intensity of these storms will be realized.

By the following morning, this upper low is forecast to have opened up and lifted into the Pacific Northwest. Meanwhile, a broad longwave trough fills out the eastern Pacific which maintains a chance for showers on Sunday into early next week. Much of the focus should remain over the foothills and mountains given the combination of upstream weak shortwaves and upslope flow.

Regarding temperatures, the mentioned upper low will cool things off considerably as Valley/Delta highs drop into the upper 70s/lower 80s which is roughly a 20 to 25 degree drop from earlier in the week. Such readings will be around 3 to 6 degrees below late May/early June climatology. ~BRO

AVIATION. VFR conditions over Interior NorCal the next 24 hours with surface winds generally below 12 knots.

STO WATCHES/WARNINGS/ADVISORIES. Excessive Heat Warning until 7 PM PDT Thursday for Carquinez Strait and Delta-Central Sacramento Valley-Motherlode-Mountains Southwestern Shasta County to Western Colusa County-Northeast Foothills/Sacramento Valley-Northern Sacramento Valley-Southern Sacramento Valley.

Excessive Heat Warning until 7 PM PDT Thursday for Northern San Joaquin Valley.

Excessive Heat Warning from 7 AM to 7 PM PDT Thursday for Shasta Lake Area / Northern Shasta County.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
South Lake Tahoe, Lake Tahoe Airport, CA17 mi72 minN 010.00 miFair56°F46°F72%1018.4 hPa
Truckee-Tahoe, CA21 mi70 minN 010.00 miFair54°F44°F72%1023.7 hPa

Link to 5 minute data for KTVL

Wind History from TVL (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmS3CalmNE3NE5N5N6----SW10
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S6SW4CalmS4CalmS3
1 day agoS3S4S4CalmCalmS4S4CalmNE33453N7NE6NE6NE8Calm3CalmCalmCalmCalmS3
2 days agoS5CalmS4CalmCalmS4S4CalmNE5NE8CalmN5N5NE8----N5N4CalmCalmCalmCalmS4S3

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Wed -- 12:14 AM PDT     Moonset
Wed -- 12:15 AM PDT     2.20 feet High Tide
Wed -- 05:45 AM PDT     Sunrise
Wed -- 06:09 AM PDT     0.89 feet Low Tide
Wed -- 10:01 AM PDT     2.98 feet High Tide
Wed -- 10:05 AM PDT     Moonrise
Wed -- 07:23 PM PDT     -0.20 feet Low Tide
Wed -- 08:21 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.22.11.91.61.310.91.11.72.632.92.62.21.61.10.60.2-0.1-0.2-0.10.30.91.6

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
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Wed -- 12:14 AM PDT     Moonset
Wed -- 04:39 AM PDT     0.89 feet Low Tide
Wed -- 05:45 AM PDT     Sunrise
Wed -- 08:52 AM PDT     2.98 feet High Tide
Wed -- 10:06 AM PDT     Moonrise
Wed -- 05:53 PM PDT     -0.20 feet Low Tide
Wed -- 08:21 PM PDT     Sunset
Wed -- 11:58 PM PDT     2.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.11.81.51.10.90.91.322.732.82.521.50.90.40.1-0.1-0.2-00.51.11.72.1

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sacramento, CA (3,6,7,8)
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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 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.