Friday, December6, 2019
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Marine Weather and Tides
East Oakdale, 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 7:02AMSunset 4:45PM Thursday December 5, 2019 9:51 PM PST (05:51 UTC) Moonrise 1:32PMMoonset 12:33AM Illumination 68% 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 907 Pm Pst Thu Dec 5 2019
.small craft advisory in effect from 7 am pst Friday through late Friday night...
Tonight..SE winds 5 to 15 kt.
Fri..SE winds 10 to 20 kt with gusts up to 25 kt. Showers likely.
Fri night..SE winds 15 to 25 kt with gusts up to 35 kt. Showers and a slight chance of Thunderstorms.
Sat..S winds 10 to 15 kt with gusts up to 25 kt. Showers and a slight chance of Thunderstorms.
Sat night..S winds 5 to 10 kt. Rain.
Sun..SW winds 5 to 10 kt. Rain likely.
Sun night..NW winds around 5 kt.
Mon..N winds around 5 kt.
Tue..E winds around 5 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 907 Pm Pst Thu Dec 5 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 981 mb low centered 800 miles west of cape blanco will wobble east towards the northern california coast by Saturday night. This will bring another round of gusty southerly winds to the coastal waters with gale force winds expected by early Friday and persisting through Friday night. Moderate northwest swell will gradually build to around 10 to 15 feet Friday over the northern waters then spread south across the coastal waters over the weekend.


7 Day Forecast for Marine Location Near East Oakdale, CA
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location: 37.82, -120.83     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 052314 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 314 PM PST Thu Dec 5 2019

SYNOPSIS. Scattered light showers today before another winter storm will bring periods of rain and mountain snow as well as hazardous travel Friday and into the weekend. Dry conditions return next week with near average temperatures.

DISCUSSION. Cloud cover has been plentiful over much of the region although early morning fog has long mixed out over the northern San Joaquin Valley. A general mixed bag of low to mid level clouds have spread across the region within the moist conveyor belt ahead of the strong upper low offshore. KBBX radar has even picked up scattered showers across the northern Sacramento Valley into the higher terrain. However, observational data over the past 12 hours show amounts generally under 0.10 inches has fallen. The true focus in the weather shifts to the mentioned offshore low set to impact northern California Friday and into much of the weekend.

Mid-afternoon visible satellite imagery shows a rather impressive cyclone currently over 750 miles off the coast accompanied by well defined frontal features. There have even been some spurious lightning strikes underneath the dome of cold air aloft. All of this action will shift eastward during the next 24 hours. Before this occurs, expect another round of early morning patchy fog from Sacramento southward toward Modesto given all the ground and soil moisture remaining from prior rainfall. Eventually warm advection precipitation will propagate from west to east across the state, roughly hitting the Coastal Range by around noon Friday before reaching the Sacramento Valley during the mid/late afternoon. Conditions over the Sierra should quickly deteriorate as accumulating snows commence in the early evening. Accordingly, a Winter Storm Warning has been issued for elevations 6,500 feet and above.

From Friday evening through Sunday morning, multiple facets of weather will impact the region which includes heavy mountain snows, moderate to heavy rainfall in the Valley, and isolated thunderstorms. Beginning with the Sierra, heavy snow will make for another challenging travel period along all the major thoroughfare. Chain controls are likely along with major travel delays through Sunday. Gusty winds will significantly reduce visibilities, potentially reaching whiteout conditions at times. If travel plans include going across the Sierra, attempt to leave before Friday morning or wait until Monday. While snow levels initially sit around 6,500 feet, they will fall down to around 5,500 to 6,000 feet by early Sunday. Expecting anywhere from 1 to 3 feet around pass level, potentially higher in heavier snow bands and across higher mountain summits. Conditions will turn more showery by Sunday afternoon as the upper low passes overhead.

Across the Valley, a semi-persistent period of moderate to occasionally heavy rainfall will impact the region Friday afternoon into early Sunday. While storm total amounts should stay anywhere from 2 to 3 inches toward Redding and 1 to 2 inches from Sacramento southward, hourly rainfall rates are likely to stay under 0.25 inches. This will limit any major hydrologic issues although cannot rule out localized flooding due to clogged storm drains nor ponding on roads. As the cold, unstable air aloft moves through over the weekend, some isolated thunderstorms are possible. Any breaks in the clouds will maximize instability in the column which supports a few random lightning strikes. Confidence is low in placement of such storms but will keep it in the forecast with later high-resolution models hopefully ironing out the details. In addition to the rainfall, modest pressure gradients support an uptick in southerly winds, potentially gusting 30 to 40 mph, likely higher into the foothills and elevated terrain. Conditions will gradually improve later on Sunday as heights slowly begin to build. ~BRO

EXTENDED DISCUSSION (Monday THROUGH Thursday). Not much change to the previous forecast. Ensemble and model guidance hold firm on ridge building over the Pacific Northwest early in the week. This will lead to at least a short stretch of dry weather, with the potential for some fog Tuesday morning. Looking towards to the mid to late portion of the work week, model and ensemble guidance continue to deviate from each other. Much like yesterday afternoon's runs, there is uncertainty as to when and where the next trough sets up. Some ensemble members suggest we could see light precip over northern California, mainly limited to the Cascades, Coastal range, and northern Sacramento Valley Wednesday and Thursday. Confidence is low on this occurring for the time being, thus we'll be keeping a close eye on how the models and ensembles handle the situation.

Temperatures are forecast to be within +/-5 degrees or so of their seasonal average for both daytime highs and morning lows.

AVIATION. Stratus will be the main issue of the TAF period with most sites around MVFR ceilings, with Sacramento sites southward seeing periods of VFR later this evening. Some small reductions in visibility look possible tomorrow morning, but stratus should limit dense fog.

STO WATCHES/WARNINGS/ADVISORIES. Winter Storm Warning from 4 PM Friday to 1 PM PST Sunday 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
PCOC1 - 9415144 - Port Chicago, CA 66 mi51 min E 1.9 G 2.9
SFXC1 - San Francisco Bay Reserve, CA 69 mi66 min ENE 4.1 55°F 1018 hPa53°F
RTYC1 - 9414523 - Redwood City, CA 76 mi51 min N 1.9 G 2.9 56°F 55°F1018 hPa (+0.0)

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Modesto City-County Airport - Harry Sham Field, CA15 mi58 minN 02.00 miFog/Mist50°F48°F93%1017.2 hPa
Stockton, Stockton Metropolitan Airport, CA23 mi56 minE 34.00 miFog/Mist54°F51°F90%1017 hPa

Link to 5 minute data for KMOD

Wind History from MOD (wind in knots)
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Last 24hrCalmE3CalmCalmCalmCalmE3E5SE3CalmSE4S3SE7S4S5S4SW5SW5CalmCalmCalmCalmCalmCalm
1 day agoSE3SE5SE6SE8E6E4W3W3CalmCalmE9E6E7SE5SE5S5SE6S4S4S3S3CalmCalmCalm
2 days agoW3NW8NW8NW6NW8W6NW7NW6NW7NW6NW5CalmCalmSW3CalmN3SE3CalmSW3CalmCalmSE4E5E5

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
Click for Map
Fri -- 01:32 AM PST     Moonset
Fri -- 03:33 AM PST     2.40 feet High Tide
Fri -- 07:06 AM PST     Sunrise
Fri -- 09:49 AM PST     0.35 feet Low Tide
Fri -- 01:59 PM PST     Moonrise
Fri -- 04:25 PM PST     3.30 feet High Tide
Fri -- 04:46 PM PST     Sunset
Fri -- 11:03 PM PST     0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.72.12.42.42.11.61.10.70.40.40.61.11.82.433.33.22.92.31.61.10.70.5

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Fri -- 01:20 AM PST     0.40 knots Max Flood
Fri -- 01:32 AM PST     Moonset
Fri -- 03:23 AM PST     -0.00 knots Slack
Fri -- 07:06 AM PST     Sunrise
Fri -- 07:08 AM PST     -0.84 knots Max Ebb
Fri -- 10:36 AM PST     0.00 knots Slack
Fri -- 01:45 PM PST     0.69 knots Max Flood
Fri -- 01:59 PM PST     Moonrise
Fri -- 04:29 PM PST     -0.00 knots Slack
Fri -- 04:45 PM PST     Sunset
Fri -- 08:25 PM PST     -0.94 knots Max Ebb
Fri -- 11:53 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.40.1-0.2-0.5-0.8-0.8-0.8-0.6-0.30.20.50.70.70.50.2-0.2-0.6-0.8-0.9-0.9-0.7-0.4

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 (0,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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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.