Sunday, November19, 2017 L-36.com


Marine Weather and Tides
Hercules, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:53AMSunset 4:56PM Saturday November 18, 2017 10:27 PM PST (06:27 UTC) Moonrise 6:54AMMoonset 5:32PM Illumination 0% Phase: New Moon; Moon at 0 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 San Francisco Bay North Of The Bay Bridge- 917 Pm Pst Sat Nov 18 2017
Tonight..NE winds 10 kt.
Sun..NW winds 10 kt.
Sun night..W winds 10 kt.
Mon..E winds 10 kt. Slight chance of rain in the morning, then chance of rain in the afternoon.
Mon night..E winds 5 to 15 kt. Slight chance of rain in the evening.
Tue..E winds 10 to 20 kt...becoming northeast 5 kt.
Wed..NE winds 5 kt.
Thanksgiving day..N winds 5 to 10 kt...becoming w.
PZZ500 917 Pm Pst Sat Nov 18 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the coast of central california will continue to generate light northerly winds through Sunday evening. Winds switch to southerly by late Sunday night or early Monday ahead of a frontal boundary. Winds over the southern waters will remain light to moderate out of the northwest. Light to moderate seas will continue through the weekend.

7 Day Forecast for Marine Location Near Hercules, CA
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location: 38.02, -122.29     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 190615
afdmtr
area forecast discussion
national weather service san francisco bay area
1015 pm pst Sat nov 18 2017

Synopsis Dry weather will continue through the end of the
weekend, with mild days and cool nights. The next weather system
will bring rain chances late Sunday night and Monday, mainly
across the north bay. There is a slight chance of additional
rainfall at times in the north bay for much of next week, but
most of our area is forecast to be warm and dry through
thanksgiving.

Discussion As of 9:00 pm pst Saturday... Skies are mostly clear
this evening except for areas of high clouds - clouds which
helped produce a beautiful sunset earlier this evening.

Temperatures are running close to what they were last evening at
this time, and expect another chilly night with patchy frost in
the interior valleys, especially in the north bay valleys and the
valleys of southern monterey county. An early evening forecast
update included decreasing low temperatures for tonight in some
locations and adding patchy frost late tonight and early Sunday.

Little change is expected on Sunday. After a cool start, expect
highs mostly in the 60s, along with periods of high clouds.

Southwesterly flow over the eastern pacific is directing a plume
of moist air towards the coast of the pacific northwest this
evening. An upper trough off the coast of british columbia is
forecast to sag slowly to the southeast through Sunday night and
help drive the moisture plume south into northwest california.

However, at the same time, an upper ridge off the coast of baja is
forecast to build northward. This ridge will block the southward
advancement of the trough and moisture plume. Increased moisture
will make its way as far south as the north bay by late Sunday
night, and there may be sufficient warm advection coincident with
this moisture to generate rainfall in the north bay late Sunday
night and Monday. However, the models have been showing a trend
towards more rapid strengthening of the ridge over southern and
central california. Thus, it now appears that only northern sonoma
county and northern napa county may see measurable rain on
Monday, with amounts of only a quarter of an inch or less. The
early evening forecast update included a reduction in pops for all
areas late Sunday night through Monday night. Rain chances will
end in all areas by late Monday night.

Our weather for the remainder of next week, including thanksgiving
day, will be dominated by the upper ridge that is forecast to
strengthen over the southwestern u.S. Through midweek. This will
mean dry and mild weather for most of our forecast area, with
widespread high temperatures in the 70s expected from Tuesday
through thanksgiving, and even some lower 80s likely across the
southern portion of our area. Meanwhile, moist southwesterly flow
between the upper ridge and a deepening trough offshore, will
continue to produce rainfall across northwest california. There is
a chance that the southern end of this precipitation may graze the
north bay at times through the week. But the latest longer range
models indicate it's unlikely that even the north bay will see any
rain from Tuesday through Thursday. According to the 00z gfs, rain
will redevelop in the north bay late Thursday night into Friday.

But the 12z ECMWF maintains dry conditions through Friday.

Prospects for more rainfall are somewhat better by next weekend.

Aviation As of 10:15 pm pst Saturday... The air mass is mainly dry
and stable supportingVFR tonight and Sunday. Few-sct cirrus clouds
tonight then high clouds thicken by late morning Sunday.

Vicinity of ksfo...VFR. Light wind tonight and Sunday.

Sfo bridge approach...VFR.

Monterey bay terminals...VFR. Wind SE 5-10 knots tonight and Sunday
morning then light W Sunday afternoon and evening.

Marine As of 10:13 pm pst Saturday... High pressure off the coast
of central california will continue to generate light northerly winds
through Sunday evening. Winds switch to southerly by late Sunday night
or early Monday ahead of a frontal boundary. Winds over the southern
waters will remain light to moderate out of the northwest. Light to
moderate seas will continue through the weekend.

Mtr watches warnings advisories
Tngt None.

Public forecast: dykema
aviation: canepa
marine: bam
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi46 min W 2.9 53°F 1022 hPa
SFXC1 - San Francisco Bay Reserve, CA 19 mi103 min NNE 1.9 41°F 1021 hPa38°F
46237 - San Francisco Bar, CA (142) 24 mi58 min 57°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi38 min NNW 7.8 G 9.7 55°F 56°F3 ft1020.9 hPa (-0.5)

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA13 mi35 minN 010.00 miFair48°F41°F77%1020.4 hPa
Napa, Napa County Airport, CA13 mi34 minNNE 310.00 miFair45°F39°F80%1020.6 hPa
Novato / Gnoss Field, CA16 mi33 minN 010.00 miFair43°F39°F87%1021.7 hPa
Oakland, Metro Oakland International Airport, CA22 mi35 minNE 310.00 miPartly Cloudy49°F39°F71%1021.4 hPa
Petaluma Municipal Airport, CA23 mi53 minN 010.00 miFair41°F39°F93%1021.7 hPa

Wind History from APC (wind in knots)
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Last 24hrCalmCalmS3E4SE3E3N4NE3NE3CalmCalmW35SW5SW4SW6SW5SW3SE3CalmE4NW3NE3NE3
1 day agoW10W11SW3W7W3W3W5CalmCalmN3N4N5CalmNW54N9NE7N8N6E4NE5CalmCalmNE4
2 days ago--SW11W7W10W6W8W6W4SW5SW4SW4SW6SW6SW6SW7SW6SW4SW8SW6W4W8SW3SW5W10

Tide / Current Tables for Hercules, Refugio Landing, San Pablo Bay, California
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Hercules
Click for Map
Sun -- 01:38 AM PST     5.25 feet High Tide
Sun -- 06:54 AM PST     Sunrise
Sun -- 07:02 AM PST     2.50 feet Low Tide
Sun -- 07:49 AM PST     Moonrise
Sun -- 12:28 PM PST     6.54 feet High Tide
Sun -- 04:54 PM PST     Sunset
Sun -- 06:11 PM PST     Moonset
Sun -- 07:46 PM PST     -0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.45.15.24.84.13.32.72.52.83.64.75.86.56.55.94.83.31.80.5-0.2-0.40.21.22.4

Tide / Current Tables for Davis Point, California Current
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Davis Point
Click for Map
Sun -- 03:34 AM PST     -0.00 knots Slack
Sun -- 06:32 AM PST     -1.11 knots Max Ebb
Sun -- 06:54 AM PST     Sunrise
Sun -- 07:49 AM PST     Moonrise
Sun -- 08:32 AM PST     0.00 knots Slack
Sun -- 10:50 AM PST     1.63 knots Max Flood
Sun -- 01:46 PM PST     -0.00 knots Slack
Sun -- 04:54 PM PST     Sunset
Sun -- 06:11 PM PST     Moonset
Sun -- 06:54 PM PST     -2.22 knots Max Ebb
Sun -- 10:01 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.110.70.3-0.2-0.7-1-1.1-0.50.51.41.61.20.6-0.2-0.8-1.4-1.8-2.1-2.2-1.9-1.1-00.8

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (1,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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weather_mapweather_map weather_map

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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 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.