Thursday, January21, 2021
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Marine Weather and Tides
Knightsen, 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 7:17AMSunset 5:19PM Thursday January 21, 2021 6:11 PM PST (02:11 UTC) Moonrise 12:05PMMoonset 12:58AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 218 Pm Pst Thu Jan 21 2021
Tonight..SW winds 5 to 15 kt. A slight chance of showers this evening. A chance of showers after midnight.
Fri..W winds 5 to 15 kt. A chance of showers.
Fri night..N winds 5 to 10 kt. A slight chance of showers.
Sat..N winds 5 to 10 kt.
Sat night..W winds up to 10 kt.
Sun..SW winds 5 to 15 kt. Rain likely.
Sun night..NW winds 10 to 20 kt with gusts up to 25 kt. A chance of rain.
Mon..NW winds 5 to 15 kt.
Tue..S winds 5 to 15 kt. Rain likely.
PZZ500 218 Pm Pst Thu Jan 21 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A cold front will move in from the north later tonight and early Friday bringing gusty winds and scattered showers. Unsettled weather will continue into the weekend with additional showers. A stronger storm system will impact the region the middle of next week. A moderate northwest swell prevails over the seas.


7 Day Forecast for Marine Location Near Knightsen, CA
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location: 37.98, -121.58     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 212222 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 222 PM PST Thu Jan 21 2021

SYNOPSIS. Dry weather today, then periods of rain and snow Friday and into next week, bringing potential winter weather driving hazards.

DISCUSSION. Visible satellite imagery shows some high clouds traversing over central and northern California this afternoon. Temperatures are running at or slightly below compared to this time 24 hours ago as yesterday's ridge axis that was positioned over northern California has come and gone. Additionally, the offshore surface pressure gradients continue to relax today, which is reflected in the light wind speeds across the region. Even the notoriously wind-prone Jarbo Gap just north of Lake Oroville is reporting gusts less than 15 mph. High temperatures across the Valley will warm to the upper 50s to middle 60s by the time the afternoon wraps up.

Upper level low presently centered several hundred miles west of Seattle will drop southeastward over the next 24 hours, and will open the door to a long overdue and welcomed pattern change for northern California. Precipitation chances will initially increase from north to south overnight tonight and into the day on Friday, bringing generally light rain and snow amounts to the area. The cooling airmass will result in steeping lapse rates with some minor instability (100-200 J/kg CAPE), particularly around the Delta and northern San Joaquin Valley. Therefore, would not be surprised if isolated thunderstorms develop on Friday afternoon. Total rain amounts with this first system will remain at/below 0.25 inches for most Valley locations. For the mountains, snow accumulations in the 2 to 5 inch range are expected above 4,000 ft with a dusting as low as 3,000 ft elevation. Precip chances will drop overnight Friday with mostly dry conditions for the first half of the weekend.

A second wetter system will take aim on the region late Sunday and into Monday. At this point, it looks like the first half of the day should be largely uneventful with precipitation not expected until the afternoon. Snow levels will drop overnight Sunday, possibly as low as 1,000 ft in the Sierra foothills and even lower in Shasta County (500 to 750 ft elevation, potentially), so something to keep a very close eye on with regard to potential transportation impacts. // Rowe

EXTENDED DISCUSSION (Monday THROUGH Thursday). Model ensembles show good agreement in long wave trough deepening further over California on Monday, with shortwave digging down into Central and Southern California and becoming a closed low. With the core shifting to the south, some wrap-around snow showers should continue over the mountains, mainly over the northern Sierra. An additional snow accumulation of 1 to 2 inches is expected over the mountains. This could cause some minor mountain travel delays.

Monday night and early Tuesday should see a bit of a lull in the precipitation before the next system arrives. Clearing skies and a cold and moist air mass could allow frost to develop over much of the Valley. NAEFS anomalies table shows cold temperature anomalies of -2 for 850mb and -3 for 500mb/700mb. Valley Tuesday morning lows in the upper 20s and 30s are projected, but will determine to an extent on home much clearing there will be. Mountain peaks and basins could see lows from teens to single digits.

Tuesday late afternoon/early evening the next system will begin to spread in. This system looks to have a strong moisture tap as well as some very cold air. Snow amounts of around a couple feet are possible over higher mountains on Wednesday, maybe a foot down to 3000 feet. This will likely bring significant travel problems for the mountains and foothills. Snow levels around 1500 feet are expected in Shasta County, around 2000 feet elsewhere.

Ensembles suggest this system could bring more heavy snow through Thursday bringing more travel problems for the mountains and upper foothills. There are even hints of periods of precipitation continuing into the weekend. EK

AVIATION. VFR conditions into the overnight. Mainly VFR conditions continue for Friday but light showers are possible after 12z with OVC clouds 035-070. MVFR will be possible in any showers due to locally lower cigs. Winds remain below 10 knots.

STO WATCHES/WARNINGS/ADVISORIES. None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 17 mi77 min WNW 4.1 G 4.1 59°F 1015.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 25 mi77 min WSW 2.9 G 4.1 59°F 52°F1015 hPa
SFXC1 - San Francisco Bay Reserve, CA 28 mi86 min NW 5.1 60°F 1016 hPa28°F
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi77 min W 7 G 8.9 59°F 52°F1015.4 hPa
UPBC1 29 mi77 min W 9.9 G 12
CQUC1 35 mi82 min 52°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi77 min SW 8 G 11 54°F 1015.3 hPa
LNDC1 39 mi77 min NNW 4.1 G 6 52°F 1016.1 hPa
AAMC1 - 9414750 - Alameda, CA 41 mi77 min W 8.9 G 12 51°F 53°F1016.3 hPa
OBXC1 42 mi77 min 51°F 48°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 42 mi77 min W 6 G 8 50°F 1016.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 42 mi77 min W 7 G 8
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi77 min S 11 G 12 52°F 1016.4 hPa
RCMC1 - 9414863 - Richmond, CA 44 mi77 min S 1 G 2.9 53°F 53°F1015.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 45 mi77 min W 5.1 G 8.9 50°F 1015.1 hPa
PXSC1 45 mi77 min 51°F 48°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi90 min W 5.1 50°F 1016 hPa
RTYC1 - 9414523 - Redwood City, CA 47 mi77 min NNW 8 G 11 52°F 55°F1016.4 hPa
FTPC1 - 9414290 - San Francisco, CA 48 mi77 min W 8.9 G 13 49°F 53°F1016.6 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Stockton, Stockton Metropolitan Airport, CA18 mi76 minN 010.00 miFair64°F31°F29%1014.8 hPa
Livermore, Livermore Municipal Airport, CA23 mi78 minWNW 710.00 miFair60°F26°F27%1015 hPa

Link to 5 minute data for KSCK

Wind History from SCK (wind in knots)
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Last 24hrW3W4W4E3S3E3E4E3SE3CalmCalmSE3NE3NE3E4SE5SE5SE6SE3S6S3S4CalmCalm
1 day agoN12NW7W9W6W9W9W6W7W7W6SW6W8W4SW3CalmNW5NW7NW7NW6NW7NW5N6NW7W5
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Tide / Current Tables for Irish Landing, Sand Mound Slough, San Joaquin River, California
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Irish Landing
Click for Map
Thu -- 12:58 AM PST     Moonset
Thu -- 05:01 AM PST     0.85 feet Low Tide
Thu -- 07:18 AM PST     Sunrise
Thu -- 11:44 AM PST     3.28 feet High Tide
Thu -- 12:04 PM PST     Moonrise
Thu -- 05:17 PM PST     Sunset
Thu -- 07:12 PM PST     0.59 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.32.11.71.210.811.31.92.533.23.33.12.72.11.61.10.80.60.711.41.8

Tide / Current Tables for Vulcan Island .5 mi E, San Joaquin River, California Current
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Vulcan Island .5 mi E
Click for Map
Thu -- 12:57 AM PST     Moonset
Thu -- 01:00 AM PST     -0.00 knots Slack
Thu -- 03:50 AM PST     -0.34 knots Max Ebb
Thu -- 06:51 AM PST     0.00 knots Slack
Thu -- 07:17 AM PST     Sunrise
Thu -- 09:50 AM PST     0.66 knots Max Flood
Thu -- 12:03 PM PST     Moonrise
Thu -- 01:31 PM PST     -0.00 knots Slack
Thu -- 05:09 PM PST     -0.46 knots Max Ebb
Thu -- 05:16 PM PST     Sunset
Thu -- 08:55 PM PST     0.00 knots Slack
Thu -- 11:42 PM PST     0.37 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20-0.2-0.3-0.3-0.3-0.200.40.60.70.60.40.2-0.1-0.3-0.4-0.5-0.4-0.3-0.200.20.3

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
Ground Weather Radar Station




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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.