Monday, January20, 2020
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Marine Weather and Tides
Walnut Grove, 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 7:17AMSunset 5:15PM Monday January 20, 2020 11:14 AM PST (19:14 UTC) Moonrise 3:35AMMoonset 1:46PM Illumination 20% Phase: Waning Crescent; Moon at 25 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- 828 Am Pst Mon Jan 20 2020
Today..SE winds up to 10 kt, becoming sw this afternoon.
Tonight..S winds 5 to 15 kt. Rain likely.
Tue..S winds 10 to 20 kt with gusts up to 25 kt. Rain.
Tue night..NW winds up to 10 kt. A chance of rain.
Wed..NE winds up to 10 kt.
Wed night..NE winds up to 10 kt.
Thu..N winds around 5 kt.
Fri..SW winds around 5 kt. A chance of rain.
PZZ500 828 Am Pst Mon Jan 20 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds become southerly today ahead of an approaching frontal system and will increase by this evening before the system moves through the waters on Tuesday. Moderate northwest swell will persist with a longer period northwest swell arriving this afternoon and wave heights build through midweek. This will generate hazardous seas conditions for smaller vessels. Another long period northwest swell will then arrive late week.


7 Day Forecast for Marine Location Near Walnut Grove, CA
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location: 38.23, -121.49     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 201100 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 300 AM PST Mon Jan 20 2020

Synopsis. Some light precipitation possible across the higher elevations of the northern Sierra today, otherwise mostly cloudy conditions. More widespread precipitation chances return tonight and Tuesday.

Discussion. Upper ridge has shifted east with with satellite imagery showing considerable mid and high clouds moving up from the southwest ahead of a weak weather system. Surface observations showing patchy light fog developing over portions of the Sacramento Valley while stratus is locked in again across the northern San Joaquin Valley. The extensive cloud cover is forecast to limit overall fog potential this morning.

The higher elevations of the northern Sierra may see a few sprinkles or light showers today as the weak system moves through. The remainder of the region is expected to see dry weather continue today. Forecast soundings indicate the passage of the weak system may be enough to disrupt the inversion over the Central Valley allowing for earlier mix-out of stratus and a little warmer temperatures today compared to Sunday.

Next stronger Pacific frontal system moves in tonight spreading light QPF across the northern half of the forecast area. Winds increase later tonight and Tuesday as the front approaches and moves inland. Bulk of precipitation expected during the day on Tuesday over the northern mountains and northern Sierra (0.50 to 1.25 inches) as the front moves through. The valley may see upwards of 0.25 to 0.40 inches, mainly to the north of Sacramento.

Forecast snowfall ranges from around 2-6 inches across the northern Sierra above 5000 feet with local amounts approaching a foot over the higher peaks in the northern mountains. Very little impact to travel possible until potentially Tuesday afternoon and evening across the northern Sierra passes.

Upper ridging returns mainly dry weather for the area on Wednesday and Thursday, except for some light warm-advection precip possible across the northern third of the forecast area as stronger systems pass to our north into the PacNW. Night and morning valley fog may return and become more extensive.

EXTENDED DISCUSSION (Friday THROUGH Monday). A weak system will bring light showers on Friday, mainly over the northern mountains. Elsewhere, dry conditions are expected. Ensembles indicate a troughing pattern developing this weekend, with the potential for widespread precipitation across the region. Specific details will likely change given model disagreement in terms of timing and strength. At this point, the heaviest precipitation is expected to occur late Saturday into Sunday. Latest ECMWF ensemble is showing moderate to high probabilities of QPF exceeding 0.5 inches over higher terrain, and over 1 inch over the Sierra and Lassen National Park. This system could bring mountain travel impacts as snow levels lower below pass levels early Sunday morning.

AVIATION. MVFR conditions, local IFR/LIFR, from KMYV southward through 18z Monday due to BR/FG. Isolated Sierra showers possible after 18z Monday. A Pacific system will spread rain and mountain snow after 06z Tuesday; mainly MVFR/IFR conditions are expected in the Valley with IFR/LIFR over the mountains. Winds are expected to be below 12 knots. South winds will increase after 10z-12z Tuesday.

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 25 mi62 min 45°F 1018.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 28 mi89 min SW 1
PCOC1 - 9415144 - Port Chicago, CA 31 mi56 min 49°F
MZXC1 - 9415102 - Martinez-Amorco CA 36 mi62 min 46°F 50°F1018.6 hPa
UPBC1 36 mi74 min E 7 G 8
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi56 min 48°F 1017.5 hPa
AAMC1 - 9414750 - Alameda, CA 53 mi56 min 51°F

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sacramento Executive Airport, CA20 mi81 minSSW 42.00 miFog/Mist44°F41°F89%1018.8 hPa
Fairfield / Travis Air Force Base, CA24 mi76 minN 04.00 miFog/Mist43°F41°F93%1019.7 hPa

Link to 5 minute data for KSAC

Wind History from SAC (wind in knots)
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Last 24hrCalmSE3CalmS4SE3S3CalmSW4CalmCalmCalmCalmSW3CalmS5CalmNW4CalmE3CalmSW4CalmS4Calm
1 day agoN8N8N11N11N9NW6N6NW3CalmCalmCalmS3CalmSE3SE4SE3SE3SE5S3SE3SE3CalmS5Calm
2 days agoW4NW5NW6NW6NW6NW5NW4NW4NW5NW6W4NW4CalmCalmCalmCalmNW4CalmCalmNW4N3N4NE6N8

Tide / Current Tables for New Hope Bridge #4, San Joaquin River, California
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New Hope Bridge #4
Click for Map
Mon -- 03:03 AM PST     2.66 feet High Tide
Mon -- 03:35 AM PST     Moonrise
Mon -- 07:19 AM PST     Sunrise
Mon -- 08:44 AM PST     1.06 feet Low Tide
Mon -- 01:46 PM PST     Moonset
Mon -- 02:28 PM PST     3.86 feet High Tide
Mon -- 05:14 PM PST     Sunset
Mon -- 10:40 PM PST     -0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.82.42.72.52.21.71.41.11.11.422.83.53.83.83.532.31.60.90.3-0-0.1

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
Mon -- 12:49 AM PST     0.48 knots Max Flood
Mon -- 03:33 AM PST     -0.00 knots Slack
Mon -- 03:34 AM PST     Moonrise
Mon -- 06:04 AM PST     -0.31 knots Max Ebb
Mon -- 07:18 AM PST     Sunrise
Mon -- 08:39 AM PST     0.00 knots Slack
Mon -- 11:38 AM PST     0.73 knots Max Flood
Mon -- 01:46 PM PST     Moonset
Mon -- 03:16 PM PST     -0.00 knots Slack
Mon -- 05:14 PM PST     Sunset
Mon -- 07:15 PM PST     -0.60 knots Max Ebb
Mon -- 11:02 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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0.40.50.40.2-0.1-0.2-0.3-0.3-0.10.10.50.70.70.60.40.1-0.2-0.4-0.5-0.6-0.6-0.4-0.2-0

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 (14,3,4,5)
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Ground Weather Radar Station Sacramento, 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.