Saturday, November18, 2017

Marine Weather and Tides
Tamalpais-Homestead Valley, 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 6:54AMSunset 4:57PM Saturday November 18, 2017 2:21 AM PST (10:21 UTC) Moonrise 6:55AMMoonset 5:34PM Illumination 0% Phase: New Moon; Moon at 29 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- 843 Pm Pst Fri Nov 17 2017
Tonight..N winds 10 kt. Patchy fog after midnight.
Sat..NE winds 10 kt. Patchy fog in the morning.
Sat night..N winds 10 kt.
Sun..NW winds 10 kt.
Sun night..SW winds 5 to 15 kt. Slight chance of rain after midnight.
Mon..E winds 5 to 15 kt. Chance of rain.
Tue..E winds 10 kt. Slight chance of rain.
Wed..SE winds 5 kt.
PZZ500 843 Pm Pst Fri Nov 17 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to locally moderate northerly winds will continue tonight, decreasing through the weekend. Winds turn southerly and increase late Sunday night into early Monday ahead of a weak frontal boundary. Seas light to moderate, easing through the coming days.

7 Day Forecast for Marine Location Near Tamalpais-Homestead Valley, CA
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location: 37.89, -122.57     debug

Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 180543
area forecast discussion
national weather service san francisco bay area
943 pm pst Fri nov 17 2017

Synopsis Dry and seasonably cool weather can be expected
through the weekend. The next system will bring rain chances late
Sunday night through Monday, mainly across the north bay.

Additional rainfall is possible at times in the north bay for
much of next week, but most of our area will likely see dry and
warm weather.

Discussion As of 9:00 pm pst Friday... A low amplitude upper
level ridge, currently centered offshore along 130w, is forecast
to shift over california by tomorrow. This ridge will maintain dry
weather conditions across our entire forecast area through the
weekend. High temperatures today were mostly in the 60s. Expect
more of the same through the weekend with a few lower 70s possible
in monterey county. Mostly clear skies will mean cool nights
through the weekend, with inland valley locations expected to see
overnight lows in the 30s. May need to consider a frost advisory
in the north bay valleys for Saturday night early Sunday morning.

An upper trough currently in the gulf of alaska is forecast to
move slowly to the southeast over the next few days, reaching the
pacific northwest by late Sunday. Meanwhile, southwesterly flow
across the eastern pacific will direct a moist airmass to the west
coast by late in the weekend. However, the trough's southward
advancement will be stymied by an upper ridge west of baja
building slowly northward over southern and central california.

What this means for our area is that although precipitable water
values will increase significantly by late Sunday night and
Monday, most dynamics will be focused well to our north. The
00z NAM and 00z GFS forecast only light to moderate warm
advection rainfall across the north bay on Monday, with perhaps
spotty light precip as far south as san mateo and alameda
counties. The 12z ECMWF forecasts more widespread and heavier
rainfall with the Monday system, but wouldn't be surprised if the
00z ECMWF trends drier too.

During the first half of next week the synoptic pattern is
forecast to become more amplified with a trough deepening well
offshore and an upper ridge strengthening over the southwestern
us. What this likely will mean is that nearly all precipitation
after Monday will be focused across the pacific northwest and far
northern california, while our area remains mostly dry. The ecmwf,
which as recently as yesterday had been forecasting a wet and
windy storm across our area late on thanksgiving, now shows almost
no rainfall in our area that day. The general model consensus for
next week is for periodic rain chances across the far northern
part of our forecast area, but dry and warm weather elsewhere with
widespread high temperatures in the 70s.

A forecast update late this afternoon included reducing rain
chances across the southern portion of our forecast area from
Sunday night through the middle of next week. If the 00z ecmwf
trends drier like the other models, there may be good reason to
reduce rain chances even further.

Aviation As of 9:42 pm pst Friday... For 06z tafs. Only major
change from 00z TAF package is the removal of fg at ksts
tonight overnight. However, if temperatures cool down enough,
patchy dense fg is still possible at ksts before sunrise.

Otherwise and elsewhere,VFR will prevail overnight and through
the TAF period. Generally light and variable winds through
tomorrow morning.

Vicinity of ksfo...VFR. Light and variable winds overnight,
becoming wnw tomorrow afternoon and staying below 10 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. E SE winds around 5 kt overnight.

Marine As of 09:26 pm pst Friday... Light to locally moderate
northerly winds will continue tonight, decreasing through the
weekend. Winds turn southerly and increase late Sunday night into
early Monday ahead of a weak frontal boundary. Seas light to
moderate, easing through the coming days.

Mtr watches warnings advisories
Tngt None.

Public forecast: dykema
aviation: bam
marine: bam drp
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 7 mi65 min Calm 50°F 1023 hPa
46237 - San Francisco Bar, CA (142) 8 mi52 min 56°F4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi92 min NW 1.9 G 3.9 55°F 56°F4 ft1022.8 hPa (+0.0)
SFXC1 - San Francisco Bay Reserve, CA 36 mi97 min SE 7 44°F 1022 hPa39°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi92 min N 9.7 G 9.7 57°F 59°F5 ft1022.3 hPa (+0.0)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi42 min NNE 3.9 G 5.8 54°F 56°F1023.1 hPa48°F
46214 - Point Reyes, CA (029) 48 mi52 min 60°F7 ft

Wind History for San Francisco, CA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi27 minN 08.00 miFair36°F33°F93%1023.7 hPa
San Francisco, San Francisco International Airport, CA22 mi26 minWNW 610.00 miFair47°F37°F71%1022.8 hPa
Oakland, Metro Oakland International Airport, CA23 mi29 minENE 410.00 miFair43°F37°F82%1023 hPa

Wind History from DVO (wind in knots)
Last 24hrW7
1 day agoW83CalmCalmCalmCalmCalmCalmSW4SW4CalmSW4SW6SW8W7CalmCalmCalmCalmNW14
2 days agoCalmCalmSW3CalmCalmN3N3CalmSW4Calm5SE5SE6SE7SE11SE8S6

Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
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Sat -- 03:42 AM PST     New Moon
Sat -- 04:58 AM PST     2.20 feet Low Tide
Sat -- 06:54 AM PST     Sunrise
Sat -- 06:54 AM PST     Moonrise
Sat -- 11:00 AM PST     5.88 feet High Tide
Sat -- 04:56 PM PST     Sunset
Sat -- 05:33 PM PST     Moonset
Sat -- 05:45 PM PST     -0.37 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
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Sat -- 12:43 AM PST     -0.51 knots Max Ebb
Sat -- 03:19 AM PST     0.01 knots Slack
Sat -- 03:42 AM PST     New Moon
Sat -- 05:27 AM PST     0.82 knots Max Flood
Sat -- 06:53 AM PST     Sunrise
Sat -- 06:53 AM PST     Moonrise
Sat -- 08:41 AM PST     -0.00 knots Slack
Sat -- 12:51 PM PST     -0.90 knots Max Ebb
Sat -- 04:01 PM PST     0.01 knots Slack
Sat -- 04:56 PM PST     Sunset
Sat -- 05:33 PM PST     Moonset
Sat -- 06:26 PM PST     1.07 knots Max Flood
Sat -- 10:03 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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

GOES Local Image of CentralWestCoast    EDIT

Wind Forecast for San Francisco/Monterey Bay Area, CA (5,6,7,8)
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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 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 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.