Wednesday, September20, 2017 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 6:56AMSunset 7:10PM Wednesday September 20, 2017 12:38 AM PDT (07:38 UTC) Moonrise 6:19AMMoonset 6:47PM 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- 906 Pm Pdt Tue Sep 19 2017
.small craft advisory in effect until 3 am pdt Wednesday...
.small craft advisory in effect from Wednesday afternoon through late Wednesday night...
Tonight..W winds 10 to 20 kt. Gusts up to 30 kt after midnight.
Wed..W winds 15 to 25 kt with occasional gusts to 40 kt.
Wed night..W winds 15 to 25 kt with occasional gusts to 40 kt.
Thu..W winds 10 to 20 kt.
Thu night..W winds 15 to 25 kt.
Fri..W winds 5 to 15 kt.
Sat..W winds 10 kt.
Sun..W winds 10 kt.
PZZ500 906 Pm Pdt Tue Sep 19 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally gusty northwesterly winds will persist across the coastal waters through tonight. Winds will ease a bit Wednesday morning before increasing once again Wednesday night. A long period northwest swell arrived earlier today and will persist through midweek.

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 200544
afdmtr
area forecast discussion
national weather service san francisco bay area
1044 pm pdt Tue sep 19 2017

Synopsis An upper level low will dominate the western us
through the work week. There is a slight chance of rain in the
far north bay late tonight and Wednesday morning as a frontal
system moves through. Otherwise look for continued cooler than
average temperatures through Friday, along with breezy periods. A
slow warming trend is expected to begin over the weekend and
continue into early next week.

Discussion As of 9:10 pm pdt Tuesday... Locally breezy
conditions developed once again this afternoon and continued into
the evening hours. Strongest winds were observed near the coast
and in the hills where wind gusts were locally as high as 35 mph.

Otherwise, our region enjoyed a mostly sunny day with mild
temperatures. High temperatures were generally within a few
degrees of normal.

An upper trough continues to dominate the western united states
this evening. Water vapor satellite imagery currently shows a
shortwave trough off the coast of vancouver island moving to the
southeast. A surface boundary out ahead of this trough is
currently pushing into far northwest california. The models have
been consistent in producing light rain with this boundary as far
south as northern sonoma county late tonight and Wednesday
morning. Precipitation amounts are expected to be less than a
tenth of an inch and dry conditions should develop in all areas by
midday Wednesday.

After the boundary moves through our area tomorrow, west to
northwest winds will pick up once again and locally breezy
conditions can be expected by afternoon. A slightly cooler
airmass will arrive over our area tomorrow, so look for high
temperatures to about 5 degrees cooler than today.

A final shortwave trough is forecast to drop south into northern
california late Wednesday night into Thursday morning. No
precipitation is expected anywhere in our area with this
disturbance. However, it will usher in the coolest airmass we've
seen since last spring, with 850 mb temperatures forecast to drop
below 6 degrees c by Thursday morning. This will result in a few
cool nights beginning Thursday night and continuing into the
weekend. Overnight lows are forecast to drop into the 40s in some
of our inland valleys by late this week and some of the wind-
sheltered valleys may even see upper 30s. Daytime highs, however,
will begin to warm by Saturday as the upper trough over the
western u.S. Finally starts moving to the east. The warming trend
will then continue into early next week as an upper ridge over the
eastern pacific builds over california. We may also see light
offshore flow develop early next week which could mean highs in
the 80s close to the coast by Monday or Tuesday.

From previous discussion... The first good long-period northwest
swell of the season will move through the coastal waters over the
next few days. This will bring coastal hazards to the northwest-
facing beaches with an increased likelihood of rip currents, large
shore breaks, and sneaker waves. As a result, a beach hazards
statement will remain into effect through Thursday evening. If
your plans take you to the beach this week, please exercise beach
safety and never turn your back to the ocean.

Aviation As of 10:44 pm pdt Tuesday... For 06z tafs. Clear
skies prevail in the post-frontal mixed boundary layer environment
tonight. High clouds are anticipated to increase Wednesday as an
upper level trough dig south over northern california. Confidence
is low that MVFR ifr cig may possible develop early Wednesday
morning. Have kept a tempo group from 12z-17z. Light winds will
prevail through tonight then increase Wednesday afternoon as the
trough swings through.

Low confidence with regard to CIGS returning overnight.

Vicinity of ksfo...VFR conditions will prevail through tonight.

Broken MVFR cig possible between 13z-17z early Wednesday morning.

Low confidence. Sustained west winds of 15 kt will ease to around
10 kt overnight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions will prevail through tonight.

Broken ifr cig possible between 12z-16z early Wednesday morning.

Low confidence. Light winds.

Marine As of 9:00 pm pdt Tuesday... Moderate to locally gusty
northwesterly winds will persist across the coastal waters through
tonight. Winds will ease a bit Wednesday morning before
increasing once again Wednesday night. A long period northwest
swell arrived earlier today and will persist through midweek.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 3 am
sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Mry bay
public forecast: dykema rowe
aviation marine: cw
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 7 mi51 min NW 8 G 9.9 66°F1014.9 hPa
FTPC1 - 9414290 - San Francisco, CA 8 mi51 min SSW 4.1 G 5.1 64°F1015.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi51 min WNW 5.1 G 6 1015.3 hPa
46237 - San Francisco Bar, CA (142) 10 mi69 min 58°F6 ft
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi51 min SSE 1.9 G 2.9 1014 hPa
PXSC1 11 mi69 min 65°F 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 13 mi51 min WNW 5.1 G 6
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi51 min NW 4.1 G 5.1 1015 hPa
OBXC1 13 mi69 min 65°F 54°F
AAMC1 - 9414750 - Alameda, CA 16 mi51 min W 1 G 4.1 69°F1015.5 hPa
LNDC1 16 mi69 min NNW 5.1 G 7 66°F 1015 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi51 min WNW 12 G 15 1014.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi49 min NNW 18 G 21 59°F 60°F8 ft1015.1 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 24 mi51 min W 15 G 17 69°F1014.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 24 mi51 min WNW 17 G 22 58°F1015.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 28 mi51 min SW 5.1 G 8.9 69°F1014.4 hPa
RTYC1 - 9414523 - Redwood City, CA 33 mi51 min W 2.9 G 2.9 71°F1014.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi114 min W 2.9 59°F 1014 hPa53°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 36 mi51 min WNW 8.9 G 11 1013.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 42 mi49 min NNW 9.7 G 14 61°F 61°F11 ft1015.5 hPa (+0.5)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 47 mi39 min NW 14 G 18 59°F 56°F1016.3 hPa (+0.3)56°F
46214 - Point Reyes, CA (029) 49 mi69 min 63°F11 ft

Wind History for Richmond, CA
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW13
G17
NW7
G12
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G15
NW7
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NW6
G9
E1
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA16 mi64 minNW 11 G 1710.00 miFair66°F46°F49%1014.9 hPa
San Francisco, San Francisco International Airport, CA22 mi1.7 hrsW 1310.00 miFair61°F51°F70%1015.1 hPa
Oakland, Metro Oakland International Airport, CA22 mi46 minWSW 410.00 miFair63°F55°F78%1015.2 hPa
Petaluma Municipal Airport, CA24 mi64 minW 610.00 miFair59°F50°F72%1015.2 hPa

Wind History from DVO (wind in knots)
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Last 24hrW10W84NE6CalmN6N8N10N10N8
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NW10
G16
W12W14
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NW7NW9
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4NW13NW12
1 day agoCalmCalmCalmSE3E5CalmCalmSE5CalmSW8SW13SW16
G23
SW14
G23
W17NW13
G20
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G19
5W16
G24
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2 days agoCalmNW3CalmCalmN6CalmCalmNW4NW5N343SE8SE85SW12SW11SW9
G15
SW8CalmCalmCalm--SE3

Tide / Current Tables for Corte Madera Creek, San Francisco Bay, California
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Corte Madera Creek
Click for Map
Wed -- 12:35 AM PDT     6.04 feet High Tide
Wed -- 06:50 AM PDT     0.31 feet Low Tide
Wed -- 06:56 AM PDT     Sunrise
Wed -- 07:19 AM PDT     Moonrise
Wed -- 01:19 PM PDT     5.84 feet High Tide
Wed -- 07:09 PM PDT     Sunset
Wed -- 07:12 PM PDT     0.88 feet Low Tide
Wed -- 07:47 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.965.44.22.71.40.50.30.81.72.94.15.25.85.74.93.72.41.30.91.11.934.2

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
Wed -- 01:35 AM PDT     -0.00 knots Slack
Wed -- 05:03 AM PDT     -2.63 knots Max Ebb
Wed -- 06:56 AM PDT     Sunrise
Wed -- 07:19 AM PDT     Moonrise
Wed -- 08:44 AM PDT     0.01 knots Slack
Wed -- 10:43 AM PDT     2.34 knots Max Flood
Wed -- 02:07 PM PDT     -0.00 knots Slack
Wed -- 05:26 PM PDT     -2.39 knots Max Ebb
Wed -- 07:09 PM PDT     Sunset
Wed -- 07:47 PM PDT     Moonset
Wed -- 09:01 PM PDT     0.00 knots Slack
Wed -- 10:59 PM PDT     2.25 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.60.7-0.5-1.6-2.4-2.6-2.4-1.8-0.90.522.321.30.2-1-1.9-2.4-2.3-1.9-1.1-01.62.3

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 (3,6,7,8)
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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.