Tuesday, January16, 2018 L-36.com


Marine Weather and Tides
Mill 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 7:22AMSunset 5:18PM Tuesday January 16, 2018 5:19 AM PST (13:19 UTC) Moonrise 7:03AMMoonset 5:13PM 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- 240 Am Pst Tue Jan 16 2018
Today..SE winds 10 kt...becoming north in the afternoon. Chance of rain in the morning.
Tonight..E winds 10 kt. Patchy fog after midnight.
Wed..E winds 10 kt. Patchy fog in the morning.
Wed night..SW winds 10 kt. Slight chance of rain after midnight.
Thu..S winds 10 to 20 kt...becoming W 5 to 15 kt. Chance of rain, then chance of showers.
Fri..W winds 5 to 15 kt. Chance of showers, then slight chance of showers.
Sat..W winds 10 kt.
PZZ500 240 Am Pst Tue Jan 16 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Weak high pressure off the california coast will keep light northwest winds for today. Winds will switch southerly late tonight and Wednesday as a low pressure system deveops off the british columbia coast and pushes the high south. Large swells will impact the beaches through early tonight before decreasing. A larger swell with long period will arrive Thursday.

7 Day Forecast for Marine Location Near Mill Valley, CA
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location: 37.91, -122.54     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 161159
afdmtr
area forecast discussion
national weather service san francisco bay area
359 am pst Tue jan 16 2018

Synopsis A few lingering showers this morning otherwise dry but
continued cloudy today. Dry and continued mostly cloudy Wednesday
as moist flow comes in off the pacific. Next front moves in
Thursday with rain spreading north to south across the district
reaching the central coast by Thursday night. Precip will turn
showery later Thursday night into Friday as the cold upper trough
passes over the region with one of the colder airmass so far this
season. Dry but cool on Saturday before clouds increase again on
Sunday as the next front arrives with rain later Sunday into
Monday.

Discussion As of 3:38 am pst Tuesday... Radar still picking up
returns over bay area but most activity will be east of the area
by rush hour sunrise. Coastal sonoma county had a few sites report
upwards of half an inch at sea ranch on the coast and the oak
ridge raws located in the wet coastal hills. Most other locations
are reporting only a few hundredths with little or no rain south
of about the dumbarton bridge. So by the time most people start
the day any precip will have ended. However a moist zonal flow is
set up across the pacific and clouds will continue to stream
across the region today keeping daytime highs stuck around 60.

No changes of note for weds with a forecast of partly mostly
cloudy skies but continued dry and seasonably mild with highs
upper 50s to upper 60s.

The next front of interest is due to arrive later Thursday. The
models have been remarkably consistent with the timing and
intensity of this system, even beyond 240 hour forecasts! High
confidence that a well organized frontal boundary will move into
the north bay Thursday morning and then charge southward through
the bay area and reach the central coast by Thursday evening. The
fast moving nature of the system will limit rainfall potential
with current QPF forecasts showing 0.25-0.75 on average. So this
looks like a typical moderate winter-time storm. Winds will
briefly gust to around 35 mph during frontal passage as rain
drags down higher momentum air. The fast nature of the frontal
passage and modest rain totals should preclude any significant
hydro issues outside of typical commute impacts and blocked storm
drains. As always will need to monitor for brief heavy rain-rates
over the north bay burn scars, as its often the short duration
bursts versus long term heavy rain that can cause debris flows.

Precip will turn showery later Thursday night into Friday morning
as 1000-500 mb thickness values plummet to around 528 dm with 850
mb temps to around -2 celsius suggesting we should see snow on the
higher peaks of the bay area. On Friday there will be numerous
post-frontal showers, especially for the coastal hills that
benefit from cold northwest wind flow. 700 mb temps as cold as -13
celsius with sea surface temps in the upper 50s will allow for big
delta t in the lower levels. This type of pattern can produce
locally heavy rain for the monterey coast and big sur hills where
the forecast will show accumulating snow above 3500 feet for any
hikers in the los padres forest. Daytime highs on Friday will
struggle to reach 55 for nearly all areas with periodic cold rain
showers dragging down cold air. Although not in the forecast at
this time, small hail and graupel will certainly be possible as
well.

After a cold start Saturday morning, the forecast to start the
weekend looks dry but continued cool.

Will be watching for the next system to arrive later Sunday into
Monday with another round of soaking rain forecast for the
district. Latest model trends suggest front will be fairly fast
moving and pass through sometime Sunday night. Earlier solutions
showed the boundary stalling but not seeing those signals at this
time. These systems have fairly cold air associated with them and
are progressive so hydro issues should be minimal with beneficial
rainfall the main impact.

Aviation As of 4:00 am pst Tuesday... MVFR CIGS fairly
widespread across the north bay and the sfo bay area this morning
as a weak front moves through. Light rain has been reported at
times. Models indicate drier air in the midlevels working its way
down to the surface later this morning. ExpectingVFR conditions
for the north bay and sfo bay area after 18z. Lvk is a tricky
forecast due to the influence of clouds from the central valley
which could keep CIGS through the day.

Vicinity of ksfo... MVFR CIGS through 18z with some light rain
through 15z.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals... Some fog around sns will bring vsbys down
to 1 2 mile at times through 16z. Otherwise MVFR CIGS through 17z.

Marine As of 02:41 am pst Tuesday... Weak high pressure off the
california coast will keep light northwest winds for today. Winds
will switch southerly late tonight and Wednesday as a low
pressure system develops off the british columbia coast and
pushes the high south. Large swells will impact the beaches
through early tonight before decreasing. A larger swell with long
period will arrive Thursday.

Mtr watches warnings advisories
Tday High surf advisory... Sonoma county coast to monterey county coast
sca... Rough bar advisory for sf bar
public forecast: rww
aviation: W pi
marine: W pi
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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 5 mi56 min NW 1.9 53°F 1022 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi50 min NNW 2.9 G 2.9 54°F 53°F1021.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi50 min N 4.1 G 5.1 56°F 1022 hPa
46237 - San Francisco Bar, CA (142) 10 mi80 min 54°F11 ft
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi50 min SSE 4.1 G 5.1 56°F 1020.5 hPa
PXSC1 11 mi50 min 57°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 13 mi50 min Calm G 1
OBXC1 13 mi50 min 54°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi50 min Calm G 1.9 54°F 1021.7 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi50 min E 1 G 1.9 55°F 54°F1021.6 hPa
LNDC1 16 mi50 min Calm G 1 56°F 1021.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi50 min E 9.9 G 11 52°F 1021.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi90 min SSE 9.7 G 12 54°F 54°F11 ft1020.9 hPa (-0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 24 mi50 min NE 5.1 G 7 50°F 52°F1022.6 hPa50°F
PRYC1 - 9415020 - Point Reyes, CA 24 mi50 min ESE 1 G 4.1 54°F1021.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 28 mi50 min ENE 13 G 15 50°F 51°F1022.3 hPa
RTYC1 - 9414523 - Redwood City, CA 33 mi50 min SE 1.9 G 2.9 55°F 55°F1022 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi95 min ENE 2.9 49°F 1022 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 36 mi56 min E 5.1 G 6 50°F 1022.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 42 mi90 min SSE 9.7 G 12 56°F 57°F15 ft1020.8 hPa (+0.5)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 47 mi40 min ENE 3.9 G 7.8 56°F 56°F1021.5 hPa56°F
46214 - Point Reyes, CA (029) 49 mi50 min 56°F11 ft

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA16 mi25 minSSW 50.50 miFog52°F51°F100%1022.3 hPa
San Francisco, San Francisco International Airport, CA22 mi24 minN 08.00 miOvercast56°F52°F87%1022 hPa
Oakland, Metro Oakland International Airport, CA22 mi27 minN 09.00 miOvercast55°F52°F90%1022.2 hPa
Petaluma Municipal Airport, CA24 mi25 minN 00.75 miFog/Mist54°F53°F100%1022 hPa

Wind History from DVO (wind in knots)
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Last 24hrS4S4E4S8SE5CalmS6CalmSE6CalmSE4CalmCalmCalmCalm--CalmSW3S4CalmCalmCalmCalmCalm
1 day agoS7S7S6S6SE6
G11
SE7SE8SE6SE9SE7S8SE6S7S54S4S5
G11
S6SE4S7S5S6S7S8
2 days agoS4CalmS6S6S6S5SE7S8S9SE7SE8
G13
SE7S7S5S7--S7S7S6S6S8S5S6S5

Tide / Current Tables for Corte Madera Creek, San Francisco Bay, California
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Corte Madera Creek
Click for Map
Tue -- 12:42 AM PST     4.77 feet High Tide
Tue -- 05:27 AM PST     2.78 feet Low Tide
Tue -- 07:02 AM PST     Moonrise
Tue -- 07:24 AM PST     Sunrise
Tue -- 11:10 AM PST     6.14 feet High Tide
Tue -- 05:13 PM PST     Moonset
Tue -- 05:15 PM PST     Sunset
Tue -- 06:12 PM PST     -0.40 feet Low Tide
Tue -- 06:18 PM PST     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.64.84.43.83.22.82.93.34.155.76.15.95.23.92.410-0.4-0.20.41.42.53.6

Tide / Current Tables for Bluff Point .1 mi E, San Francisco Bay, California Current
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Bluff Point .1 mi E
Click for Map
Tue -- 01:10 AM PST     -0.01 knots Slack
Tue -- 03:53 AM PST     -1.20 knots Max Ebb
Tue -- 07:01 AM PST     Moonrise
Tue -- 07:09 AM PST     0.00 knots Slack
Tue -- 07:23 AM PST     Sunrise
Tue -- 08:58 AM PST     1.49 knots Max Flood
Tue -- 12:10 PM PST     -0.00 knots Slack
Tue -- 03:58 PM PST     -2.75 knots Max Ebb
Tue -- 05:12 PM PST     Moonset
Tue -- 05:15 PM PST     Sunset
Tue -- 06:18 PM PST     New Moon
Tue -- 08:03 PM PST     0.01 knots Slack
Tue -- 10:07 PM PST     2.07 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.2-0.6-1.1-1.2-1-0.7-0.111.51.30.90.2-0.8-1.8-2.5-2.7-2.5-1.9-1.1-0.11.42.12

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 (8,2,3,4)
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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.