Saturday, November17, 2018 L-36.com


Marine Weather and Tides
Tamalpais-Homestead Valley, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:52AMSunset 4:57PM Saturday November 17, 2018 9:09 AM PST (17:09 UTC) Moonrise 2:19PMMoonset 1:01AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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- 856 Am Pst Sat Nov 17 2018
Today..NE winds 10 kt...becoming sw in the afternoon. Patchy fog late in the morning. Haze and patchy smoke through the day.
Tonight..W winds 5 to 15 kt. Haze and patchy smoke.
Sun..N winds 10 kt. Haze and patchy smoke.
Sun night..W winds 5 to 15 kt. Haze and patchy smoke.
Mon..E winds 5 to 15 kt...becoming w. Haze and patchy smoke in the morning.
Tue..S winds 10 kt. Chance of rain.
Wed..S winds 5 to 15 kt. Rain likely, then chance of rain.
PZZ500 856 Am Pst Sat Nov 17 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light winds through the weekend and into early next week. An approaching storm system will bring increasing southerly winds mid week next week. Mixed moderate northwest swell and a light southerly swell will persist.


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 171226
afdmtr
area forecast discussion
national weather service san francisco bay area
426 am pst Sat nov 17 2018

Synopsis Widespread smoke and haze at times combining with
coastal fog resulting in extended poor air quality and low
visibilities over the san francisco bay area should show some
improvement first along the immediate coast today then inland
Sunday. A mid to upper level ridge has weakened and troughing is
already slowly moving in from the west this morning. Additionally
forecast models continue to indicate an active pacific weather
pattern reaching california next week with the potential for
widespread periodic rainfall starting Wednesday and continuing
through the latter part of the work week.

Discussion As of 4:12 am pst Saturday... Smoke, haze and
coastal fog, some of it patchy dense fog with visibilities under
1 4 mile, will combine to keep visibilities low this morning; air
quality remains poorest in the bay area. Forecast highs were
lowered a few degrees for today from the south bay to the north
central coast due to a chilly start, increasing cloud cover,
lingering smoke and haze, thus in these areas temperatures may
struggle to reach 60f. Stagnant weather continues as a well
entrenched albeit much weaker offshore wind pattern remains in
place unable to break down as a weaker mid november Sun angle and
feeble diurnal warming over land just can't get a foot hold of any
kind to generate a decent sea-breeze. Awaiting changes in the mid
latitude westerly flow is what is needed to dislodge this pattern,
and the early stages of it is already on our door step.

A weak 500 mb trough is approx 400 miles west of the CWA with a
925 mb elevated cool front approaching our coastal waters today;
elevated fronts typically are weak, but overall cooling and its
proximity could cause patch or two of drizzle along the big sur
coast today based on the hrrr output which is the only model
showing any qpf. Otherwise this feature remains out of reach to
generate anything more than cloud cover and advancing higher
dewpoint air eastward generating morning coastal fog as we are
seeing in the observations and on satellite imagery early this
morning. Wind flow remains light today.

The next system upstream over the eastern pacific is a 500 mb closed
low which weakens as it reaches socal Tuesday. Much earlier model
output had this spun up as a leading early week rain generator for
us, but this is not the case anymore. However, it'll give traction
to a wind reversal which will greatly help clear up the air and
improve air quality if not already begun so first on the coastline
by later today and then inland Sunday. The GFS and ECMWF have been
otherwise consistent that this system will dry out by the time it
reaches socal.

As maritime polar air settles southward to vicinity of 40 degrees
latitude over the north pacific next week the door will generously
open to wet weather here in california. Increasing moisture from
the subtropical latitudes may get ingested into these low pressure
systems based on the 00z output (and earlier output) GFS integrated
water vapor transport forecasts. Much unlike winter season 2017-2018
with large, ongoing meridional displacement, next week's weather at
least shows characteristics more closely to zonal flow. An ongoing
relatively large northern hemispheric wavenumber and somewhat
distorted polar vortex remain favorable for storm generation with
winter solstice still a bit more than 1 month away. Recent GFS and
ecmwf 240 hour forecast rain accumulation totals have suggested
totals could for the most part reverse early season rain deficits
in our CWA and this of course would greatly alleviate fire weather
concerns.

Aviation As of 04:26 pm pst Saturday... For 12z tafs. A
combination of widespread smoke and haze with patchy coastal fog
and stratus is affecting the region this morning bringing MVFR ifr
vis and or cigs. Expect patchy fog stratus to continue into late
this morning for the monterey TAF sites and possibly in the north
bay. Latest run of the hrrr smoke model suggests some improvement
in smoke late this afternoon and into this evening. This may
result in somewhat improved visibilities tonight. However,
forecast models suggest more widespread stratus development
tonight into Sunday. Generally light winds through the period.

Vicinity of ksfo... Ifr MVFR vis due to wildfire smoke. Slant range
vis issues will persist. Latest hrrr smoke model suggests some
improvement late this afternoon and tonight. More widespread low
clouds are expected tonight. Winds will remain light through the
period.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR vis with MVFR ifr CIGS due to a
combination of smoke and stratus fog. Lifr vis from fog will be
possible until around 16z. An early return of the marine layer is
forecast for tonight. Generally light winds.

Marine As of 02:14 am pst Saturday... Generally light winds
will continue through the weekend and into early next week.

Southerly winds will increase somewhat by mid- week as an upper
trough approaches the region. Mixed moderate northwest swell and a
light southerly swell will persist.

Mtr watches warnings advisories
Tday None.

Public forecast: canepa
aviation: as
marine: as
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 8 mi39 min NNE 6 G 8 49°F 55°F1017.9 hPa
46237 - San Francisco Bar, CA (142) 8 mi69 min 54°F4 ft
RCMC1 - 9414863 - Richmond, CA 9 mi39 min NW 7 G 8.9 48°F 56°F1017.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi45 min N 8.9 G 11 49°F 1017.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi39 min WNW 2.9 G 6 49°F 1016.7 hPa
PXSC1 11 mi39 min 51°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi39 min NNW 6 G 7
OBXC1 14 mi39 min 51°F 46°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi45 min NNW 5.1 G 7 50°F 1017.6 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi39 min Calm G 1.9 49°F 57°F1017.9 hPa
LNDC1 17 mi39 min NNW 4.1 G 5.1 49°F 1017.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi29 min W 3.9 G 5.8 52°F 54°F1018.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi39 min E 5.1 G 7 50°F 1017.5 hPa
PRYC1 - 9415020 - Point Reyes, CA 23 mi39 min W 1.9 G 4.1 54°F1017.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi39 min ESE 4.1 G 5.1 47°F 57°F1018.1 hPa36°F
PCOC1 - 9415144 - Port Chicago, CA 30 mi39 min NE 2.9 G 4.1 47°F 56°F1018 hPa
RTYC1 - 9414523 - Redwood City, CA 33 mi39 min W 1 G 1.9 49°F 58°F1017.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 36 mi84 min N 1.9 34°F 1017 hPa30°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi39 min W 1 G 1.9 47°F 1017.8 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi29 min S 3.9 G 5.8 56°F1018.1 hPa
46214 - Point Reyes, CA (029) 48 mi39 min 58°F6 ft

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi74 minS 31.50 miFog/Mist36°F32°F87%1017.6 hPa
San Francisco, San Francisco International Airport, CA22 mi73 minS 31.50 miMostly Cloudy with Haze47°F42°F83%1017 hPa
Oakland, Metro Oakland International Airport, CA23 mi76 minENE 31.00 miMostly Cloudy with Haze42°F35°F76%1017.3 hPa

Wind History from DVO (wind in knots)
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Last 24hrCalmCalm4SE4SE5SE4SE3S5S4CalmS4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmS44SE5S6S6SE5SE4SE4CalmCalmS4CalmCalmN3CalmCalmS3CalmS3S7CalmCalmCalm
2 days agoCalmN5CalmSE4SE4SE6SE4E4S4CalmS3S3CalmCalmCalmS3CalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
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Sausalito
Click for Map
Sat -- 12:46 AM PST     0.94 feet Low Tide
Sat -- 01:01 AM PST     Moonset
Sat -- 06:52 AM PST     Sunrise
Sat -- 07:47 AM PST     5.02 feet High Tide
Sat -- 02:01 PM PST     2.06 feet Low Tide
Sat -- 02:18 PM PST     Moonrise
Sat -- 04:56 PM PST     Sunset
Sat -- 07:24 PM PST     4.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.111.21.92.73.64.44.954.74.23.42.72.22.12.22.73.33.84.14.13.73.12.3

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
Click for Map
Sat -- 01:01 AM PST     Moonset
Sat -- 01:34 AM PST     0.82 knots Max Flood
Sat -- 05:08 AM PST     -0.01 knots Slack
Sat -- 06:52 AM PST     Sunrise
Sat -- 08:45 AM PST     -0.51 knots Max Ebb
Sat -- 11:54 AM PST     0.00 knots Slack
Sat -- 01:55 PM PST     0.58 knots Max Flood
Sat -- 02:18 PM PST     Moonrise
Sat -- 04:56 PM PST     Sunset
Sat -- 05:04 PM PST     -0.00 knots Slack
Sat -- 08:51 PM PST     -0.57 knots Max Ebb
Sat -- 11:51 PM PST     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.80.80.70.40.1-0.2-0.4-0.5-0.5-0.4-0.300.50.60.50.30-0.2-0.4-0.5-0.6-0.5-0.3

Weather Map and Satellite Images
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GOES 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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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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.