Saturday, May30, 2020
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Marine Weather and Tides
Thermalito, 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 5:39AMSunset 8:27PM Saturday May 30, 2020 5:33 AM PDT (12:33 UTC) Moonrise 12:30PMMoonset 1:15AM Illumination 59% Phase: Waxing Gibbous; Moon at 8 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 Thermalito, CA
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location: 39.56, -121.59     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 301045 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 345 AM PDT Sat May 30 2020

Synopsis. Low pressure moves through today bringing cooler weather with showers and thunderstorms with possible locally heavy precipitation. Threat of mountain showers and afternoon thunderstorms continues early next week.

DISCUSSION. 561 DM closed upper low approaching the Bay Area this morning with center progged to move inland invof of KSFO around 18z, then track through interior NorCal this afternoon. Forecast PWS over the CWA running around 1 to 1.5 inches to suggest potential for heavy precipitation. CAPE values trend up from the south this morning, spreading over much of the CWA this afternoon with values from 200-500 J/Kg. Elevated instability progs indicating widespread thunderstorm potential today with large areas of modified TT's above 30 over CWA. As upper low progresses inland later today, increasing SEly flow and upper level divergence combine over western portions of Shasta/Tehama counties, extending into the Coastal Range. HREF precip probabilities showing area of 0.5 inch/hr exceedance above 50 percent in watch area between 3 and 6 pm. The Carr-Hirz-Delta burn scar in Western Shasta will need to be watched. Flash flood potential will be dependent on cell speed and if training occurs over same region. Small hail will also be possible with stronger cells. Gusty winds can be expected, especially in the vicinity of thunderstorms. Clouds and synoptic cooling will result in high temperatures today upwards of 20 to 30 degrees lower than Friday.

Models progress upper low through Central Oregon tonight resulting in storm potential lifting northward through the CWA this evening and diminishing overnight. Secondary weaker trough moves through Sunday with possible late day showers over the higher elevations of Lassen Park and the Northern Sierra Nevada. High temps rebound some Sunday but remain below normal.

Short wave energy continues to feed into long wave trough early next week developing another upper low that remains quasi- stationary off the SoCal coast into midweek. Southerly diffluent flow will continue a threat of showers and afternoon thunderstorms over the mountains Mon/Tue. AMS warms Monday back to near normal with highs Tuesday forecast 5 to 10 degrees above normal.

PCH

EXTENDED DISCUSSION (Wednesday THROUGH Saturday). Ensembles and deterministic models continue to show a cutoff low stalling just off the southern California coast for the middle of next week. Depending on how far north this low sets up, embedded shortwaves along the northern portion of the low could produce mountain shower and thunderstorm chances each afternoon next week, mainly over the northern Sierra. Other than that, dry and warm conditions are expected. Temperatures will warm back up to around 5 to 10 degrees above normal Wednesday through Thursday, in the low to mid 90s for the Valley and mountain highs in the 60s to 70s.

Ensembles still indicate a trough approaching from the Gulf of Alaska by Friday. GEFS and EPS continue to show cooling trend, with high temperatures near normal levels. There is also a chance of precipitation by later Friday for the northern mountains, with best potential later in the weekend. EK

AVIATION. VFR conditions at TAF sites will give way to scattered MVFR and isolated IFR in showers and thunderstorms today. Isolated elevated thunderstorms are developing in the Valley early this morning over the central and southern Sacramento Valley. A more extensive band of showers and will set up over the northern Sacramento Valley 15-03z. Scattered thunderstorms develop to the south after 18z. Delta Breeze 22-29 kts with gusts around 40 kts through the Carquinez Strait and into the Sac Delta. Widespread IFR/LIFR conditions over mtns today obscuring higher terrain.

STO WATCHES/WARNINGS/ADVISORIES. Flash Flood Watch through this evening for Mountains Southwestern Shasta County to Western Colusa County-Northern Sacramento Valley-Shasta Lake Area / Northern Shasta County.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 97 mi108 min W 6

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oroville Municipal Airport, CA5 mi40 minSE 1410.00 miOvercast63°F52°F68%1012.2 hPa
Chico Municipal Airport, CA21 mi38 minSE 17 G 2310.00 miMostly Cloudy63°F51°F68%1011.5 hPa

Link to 5 minute data for KOVE

Wind History from OVE (wind in knots)
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Last 24hrCalmS3CalmW53CalmCalmSW8S9S13SE8S10S11S10S12S18S16S15
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1 day agoSW3CalmSE43CalmW433SW5W4SW3SE5SE6SE7S6E5E7E6E7S7SE7S8S6Calm
2 days agoNE3E4E5CalmSW3Calm45S96S5SW5S6S6S3E5E7E6E5SE4E4S4SE5SE3

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Sat -- 02:12 AM PDT     Moonset
Sat -- 02:46 AM PDT     2.37 feet High Tide
Sat -- 05:44 AM PDT     Sunrise
Sat -- 09:44 AM PDT     0.63 feet Low Tide
Sat -- 01:30 PM PDT     2.28 feet High Tide
Sat -- 01:30 PM PDT     Moonrise
Sat -- 08:23 PM PDT     Sunset
Sat -- 10:04 PM PDT     -0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.82.32.42.21.91.51.10.80.70.611.72.22.32.11.81.410.50.2-0-0.10.1

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Sat -- 01:37 AM PDT     2.37 feet High Tide
Sat -- 02:12 AM PDT     Moonset
Sat -- 05:44 AM PDT     Sunrise
Sat -- 08:14 AM PDT     0.63 feet Low Tide
Sat -- 12:21 PM PDT     2.28 feet High Tide
Sat -- 01:31 PM PDT     Moonrise
Sat -- 08:23 PM PDT     Sunset
Sat -- 08:34 PM PDT     -0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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22.32.42.21.81.410.80.60.81.31.92.32.22.11.81.30.80.40.1-0.1-0.10.30.9

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sacramento, CA (8,2,3,4)
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Ground Weather Radar Station Beal AFB, CA
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weather_mapweather_map weather_map

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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.