Thursday, December12, 2019
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Marine Weather and Tides
Isleton, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:11AMSunset 4:49PM Thursday December 12, 2019 2:28 PM PST (22:28 UTC) Moonrise 5:30PMMoonset 7:37AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 847 Am Pst Thu Dec 12 2019
Today..SW winds up to 10 kt. A chance of rain.
Tonight..SW winds around 5 kt. A chance of rain.
Fri..SW winds 5 to 10 kt. A chance of rain.
Fri night..W winds 5 to 10 kt. A chance of rain.
Sat..NW winds up to 10 kt. A slight chance of rain.
Sat night..W winds 5 to 10 kt.
Sun..NW winds up to 10 kt.
Mon..NE winds up to 10 kt. A chance of rain.
PZZ500 847 Am Pst Thu Dec 12 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Southerly winds remain light and will prevail through Thursday before switching to west to northwest. By Friday night, northwest winds will increase as the next storm system moves in. A large long-period northwest swell will impact the waters through Saturday. Hazardous conditions for small craft vessels will exist with this arriving northwest swell due to steep large seas.


7 Day Forecast for Marine Location Near Isleton, CA
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location: 38.13, -121.58     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 121230 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 430 AM PST Thu Dec 12 2019

SYNOPSIS. Light rain at times today, heaviest in the mountains. Heavier snowfall returns to the Sierra Friday through Saturday, creating mountain travel issues. Drier weather Sunday and early next week.

DISCUSSION. Upper level flow is mainly zonal over California this morning. Radar shows lingering showers remain over portions of the Valley and mountains as a weak Pacific moisture plume continues to stream into NorCal. Scattered showers will continue throughout the day, heaviest in the mountains and foothills. Snow levels are high, generally above 7500 to 8000 feet, with little to no accumulation expected at pass level.

Precipitation continues Friday through Saturday as another slightly stronger weather system moves into NorCal. Another influx of Pacific moisture will produce liquid precipitation amounts of around half an inch to one and a half inches in the foothills and mountains. Precipitation will be lighter in the Valley with around a quarter to a half of an inch in the northern Sacramento Valley, tapering significantly south of I-80. Heaviest precipitation expected Friday afternoon through early Saturday. This will be a colder system with snow levels dropping to around 6500 feet Thursday night through Friday. Snow amounts up to 5 to 10 inches, locally up to 15 inches, are forecast in the Sierra through early Saturday for elevations above 6500 feet. A Winter Storm Advisory has been issued. Travel is discouraged during this time as gusty winds and periods of heavy snow will create hazardous travel conditions over Sierra passes.

Precipitation turns showery Saturday with additional snow amounts of a few inches forecast Saturday through Sunday morning. Snow levels are expected to fall to around 4000 to 45000 feet behind the frontal passage. Light snow accumulations under an inch are possible down to the foothills. Current ensembles indicate another brief increase in precipitation is possible Saturday evening producing a quick few inches of additional snowfall over mountain passes. Precipitation will taper off overnight Saturday, clearing out by Sunday morning.

Upper level ridging builds over the area Sunday bringing dry weather for the beginning of the work week. HEC

EXTENDED DISCUSSION (Monday THROUGH Thursday). The start of next week will be dry as models build heights across the region. Forecast 1000-500 mb thicknesses should remain on the low side in the wake of the earlier frontal passage. In spite of the ridging aloft, this will keep Monday's temperatures close to climatology, roughly in the mid 50s over the Valley with 30s into the mountains. While skies will be mostly sunny to start the week, a projected pattern shift is likely by sometime mid-week. A somewhat complicated pattern offshore remains unresolved by the available guidance. Multi-day ensemble trends have shown a slowing of this system, generally arriving on Wednesday. It appears some form of closed low will pinch off from the prevailing westerlies which frequently offers low predictability. Recent runs of the GFS and ECMWF differ in timing and placement, with the former bringing the better threat for precipitation. At a minimum, expect an increase in cloud cover Tuesday into the subsequent days. Looking farther out, the GEFS Atmospheric River ensemble probabilities show a signal for wet conditions likely during the Dec 21/22 timeframe. Such values are higher than usual this number of days out, so this bears watching as well. ~BRO

AVIATION. Widespread MVFR/IFR conditions expected through 20z Thursday. MVFR/IFR conditions may continue through Tuesday evening in the northern Sacramento Valley. Light winds generally less than 12 kts.

STO WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory from noon Friday to 10 AM PST Saturday for West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 17 mi59 min WNW 1.9 G 2.9 57°F 1025.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 24 mi104 min NNW 4.1 60°F 1026 hPa
PCOC1 - 9415144 - Port Chicago, CA 25 mi59 min E 1 G 1.9 57°F 54°F1025 hPa
UPBC1 29 mi59 min WNW 4.1 G 6
MZXC1 - 9415102 - Martinez-Amorco CA 30 mi59 min Calm G 2.9 56°F 54°F1025.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi59 min W 6 G 8 58°F 1025.3 hPa
LNDC1 44 mi59 min NNW 2.9 G 5.1 60°F 1025.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi59 min WSW 4.1 G 8 59°F 1025.9 hPa
AAMC1 - 9414750 - Alameda, CA 45 mi59 min NNW 1 G 2.9 60°F 55°F1025.6 hPa
OBXC1 46 mi59 min 59°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi59 min W 1 G 1.9 58°F 1025.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi59 min W 1.9 G 2.9
RCMC1 - 9414863 - Richmond, CA 46 mi59 min Calm G 2.9 58°F 55°F1025.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 49 mi59 min WSW 2.9 G 6 60°F 1024.6 hPa
PXSC1 49 mi59 min 61°F 61°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 49 mi54 min SW 2.9 59°F 1026 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fairfield / Travis Air Force Base, CA21 mi2.5 hrsWSW 910.00 miOvercast63°F60°F93%1026.7 hPa
Stockton, Stockton Metropolitan Airport, CA23 mi2.6 hrsVar 36.00 miOvercast with Haze62°F51°F67%1025.9 hPa

Link to 5 minute data for KSUU

Wind History from SUU (wind in knots)
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Last 24hrN3NE5NE5E3CalmE4SE3SE4CalmCalm--E4SE3CalmSE5SE6CalmCalmCalmCalmS3CalmSW4SW9
1 day agoE3E5E5NE4NE8N4CalmNE4NE5CalmCalmCalmCalmCalmN4N3N4NE4N3CalmNE4NE4NE6N5
2 days agoSW6SW9SW9SW9SW10SW9S8S6S8S7SW3SW5CalmCalmCalmE4N4CalmN5W5NE5N6N6E4

Tide / Current Tables for Georgiana Slough entrance, Mokelumne River, California
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Georgiana Slough entrance
Click for Map
Thu -- 12:07 AM PST     -0.21 feet Low Tide
Thu -- 06:16 AM PST     2.55 feet High Tide
Thu -- 07:13 AM PST     Sunrise
Thu -- 07:37 AM PST     Moonset
Thu -- 11:08 AM PST     1.20 feet Low Tide
Thu -- 04:31 PM PST     3.71 feet High Tide
Thu -- 04:46 PM PST     Sunset
Thu -- 05:29 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-0.10.41.11.82.32.52.52.11.71.31.21.31.72.53.23.63.73.42.821.30.60.1

Tide / Current Tables for West Island Lt .5 mi SE, San Joaquin River, California Current
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West Island Lt .5 mi SE
Click for Map
Thu -- 12:18 AM PST     0.00 knots Slack
Thu -- 03:34 AM PST     0.34 knots Max Flood
Thu -- 06:31 AM PST     -0.00 knots Slack
Thu -- 07:13 AM PST     Sunrise
Thu -- 07:37 AM PST     Moonset
Thu -- 08:34 AM PST     -0.22 knots Max Ebb
Thu -- 10:44 AM PST     0.00 knots Slack
Thu -- 01:52 PM PST     0.48 knots Max Flood
Thu -- 04:30 PM PST     -0.01 knots Slack
Thu -- 04:47 PM PST     Sunset
Thu -- 05:30 PM PST     Moonrise
Thu -- 08:13 PM PST     -1.00 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.10.30.30.30.20.1-0.1-0.2-0.2-0.100.20.40.50.40.1-0.2-0.6-0.9-1-1-0.8-0.6

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sacramento, CA (17,4,5,8)
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Ground Weather Radar Station Sacramento, CA
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weather_mapweather_map weather_map

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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 numerious 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.