Thursday, December12, 2019
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Marine Weather and Tides
Bethel Island, 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 4:48PM Wednesday December 11, 2019 9:42 PM PST (05:42 UTC) Moonrise 4:41PMMoonset 6:33AM Illumination 100% Phase: Full Moon; Moon at 15 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- 824 Pm Pst Wed Dec 11 2019
Tonight..S winds 5 to 10 kt. A chance of rain.
Thu..S winds 5 to 15 kt. A chance of rain.
Thu night..W winds 5 to 10 kt. A chance of rain.
Fri..SW winds 5 to 10 kt. A chance of rain.
Fri night..W winds 10 to 20 kt with gusts up to 25 kt. A chance of rain.
Sat..W winds 5 to 15 kt.
Sat night..W winds 5 to 15 kt.
Sun..NW winds up to 10 kt.
Mon..NE winds 5 to 10 kt. A chance of rain.
PZZ500 824 Pm Pst Wed Dec 11 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light southerly winds will prevail through Thursday before switching to west to northwest. Northwest winds will increase on Saturday as a cool upper trough passes to the north of the area. Large long-period northwest swell will impact the waters Thursday night through Saturday.


7 Day Forecast for Marine Location Near Bethel Island, CA
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location: 38.01, -121.64     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 112257 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 257 PM PST Wed Dec 11 2019

SYNOPSIS. Light rain at times through Thursday, heaviest in the mountains. Widespread precipitation also expected later in the week and into the weekend. Drier weather Sunday and early next week.

DISCUSSION. Precip should increase over our forecast area tonight into Thu as a strong 150kt Pac jet south of the GOA (Gulf of AK) low reaches the coast and focuses a +3 PW anomaly into our CWA. The U.S. West Coast AR Tool shows that a "weak" AR (TPW/moisture plume) along 130W will make "landfall" during this time tonight and into Thu. Rising 5H heights will steer the storm track and main dynamics a little farther N and into the Pac NW. But the strong WAA tonite and Thu (over 5 deg C/12 hr in the 850-700 mbs layer) will interact with the moisture plume resulting in steady precip over Norcal, mainly over the Nrn mtns and areas N of I-80. One to two inches of precip is forecast over Shasta Co/Wrn Plumas Co during this time, with amounts tapering off rapidly Swd to the I-80 corridor. South of I-80/US-50, only a few hundredths are expected as the storm track shifts Nwd. Snow levels are relatively high due to the transport of subtropical moisture from Hawaii. The snow profilers indicate a snow level around 5500 ft at Shasta Dam, around 7500 ft at Oroville, and Colfax, and could rise some 500 to 1500 ft overnite due to the WAA.

The wet wx should continue on Fri as 5H heights begin to fall slowly as the GOA trof emerges from its source region. This will keep the TPW plume over our CWA through the day. Model freezing/snow level forecasts came in a little colder than previous runs and we began to lower them a little from earlier forecasts. Looks as if the snow level will drop below the passes along the I-80/US-50 corridor by Fri morning. There is likely to be enough QPF Fri and FRi nite (and maybe into Sat) to warrant a snow advisory as the snow levels drop below the Sierra passes. With the bulk of the precip falling over the Sierra, our total QPF thru 12z Sun is now falling in line within the body of the ECMWF ensembles box/whisker plots for BLU, as an example.

The precip should turn more showery on Sat as the colder/unstable air drops into Norcal as the upper low and trof move across the NErn Pac to the Pac NW/Nrn CA coast before winding down on Sun. Snow levels should drop to 3500 ft Nrn mtns to 4000 ft in the Sierra late Sat, but by then the precip will be diminishing. JHM

EXTENDED DISCUSSION (Sunday THROUGH Wednesday).

The weather system bringing multiple days of rain and snow to northern California will be moving out of the area by early Sunday morning. As troughing moves towards the southwest US, upper level ridging begins to build over the west coast. Dry weather and mostly clear skies are anticipated by mid-afternoon Sunday, with these conditions continuing through at least Monday. Tuesday onward, models have varying solutions for when another trough will impact the area bringing additional chances for precipitation. Went with ensemble guidance for this forecast bringing back wet weather to the area Tuesday, although confidence is still low at this time with the onset of any rain. Temperatures remain fairly steady Sunday into next week with Valley highs topping out in the mid-50s. Mountain locations will mainly see high temperatures in the 30s.

AVIATION.

Widespread MVFR/IFR conditions seen through around 20Z. Brief improvement may be seen before another storm brings -RA after 02Z. MVFR/IFR ceilings return by early morning to all sites. VCSH possible around 12Z at Sac terminals. Winds generally less than 12kts.

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 13 mi55 min ESE 6 G 8 53°F 1022 hPa
PCOC1 - 9415144 - Port Chicago, CA 21 mi55 min E 2.9 G 4.1 53°F 54°F1022 hPa
SFXC1 - San Francisco Bay Reserve, CA 24 mi118 min E 1.9 53°F 1023 hPa
UPBC1 26 mi55 min NE 6 G 8
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi55 min NE 6 G 8 53°F 54°F1022.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi55 min E 9.9 G 12 54°F 1021.6 hPa
LNDC1 37 mi55 min SE 5.1 G 7 58°F 1021.6 hPa
AAMC1 - 9414750 - Alameda, CA 39 mi55 min 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 39 mi55 min SE 5.1 G 7
OKXC1 - 9414776 - Oakland (Berth 34), CA 39 mi55 min SSE 4.1 G 6 57°F 1021.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi55 min SSW 4.1 G 6 58°F 1022.2 hPa
OBXC1 40 mi55 min 57°F 57°F
RCMC1 - 9414863 - Richmond, CA 41 mi55 min 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 43 mi55 min SE 6 G 11 57°F 1020.8 hPa
PXSC1 43 mi55 min 58°F 58°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 44 mi62 min NW 1.9 55°F 1022 hPa
RTYC1 - 9414523 - Redwood City, CA 46 mi55 min Calm G 2.9 60°F 57°F1022.3 hPa
FTPC1 - 9414290 - San Francisco, CA 46 mi55 min Calm G 0 55°F1022 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA22 mi50 minWSW 34.00 miFog/Mist55°F51°F87%1020.8 hPa
Stockton, Stockton Metropolitan Airport, CA22 mi48 minESE 85.00 miFog/Mist54°F50°F87%1022.3 hPa
Livermore, Livermore Municipal Airport, CA23 mi50 minSE 36.00 miFog/Mist55°F52°F90%1021.9 hPa
Fairfield / Travis Air Force Base, CA24 mi1.7 hrsESE 47.00 miLight Rain53°F51°F94%1023.4 hPa

Link to 5 minute data for KSCK

Wind History from SCK (wind in knots)
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Last 24hrE6E11CalmE4S4E5E6E7E4SE3S6SE7S6S6SE6S6SE6S5S5SE4SE8SE8SE6SE8
1 day agoNW4E4CalmCalmE4SE3CalmCalmSE3CalmCalmE3E3CalmSE5SE3E5S4E6SE6E8S3CalmN4
2 days agoNW6W6W6W6NW4W5CalmCalmCalmE3CalmSE4E4CalmSW3CalmNW4W3W3CalmCalmNW4NW8NW6

Tide / Current Tables for Irish Landing, Sand Mound Slough, San Joaquin River, California
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Irish Landing
Click for Map
Thu -- 06:16 AM PST     2.78 feet High Tide
Thu -- 07:13 AM PST     Sunrise
Thu -- 07:37 AM PST     Moonset
Thu -- 11:01 AM PST     1.38 feet Low Tide
Thu -- 04:31 PM PST     4.04 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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-0.2-00.51.322.52.82.72.31.91.51.41.522.83.5443.632.21.30.60.1

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 (0,6,7,8)
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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.