Thursday, August17, 2017 L-36.com


Marine Weather and Tides
Larkspur, 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 6:26AMSunset 8:00PM Thursday August 17, 2017 4:27 AM PDT (11:27 UTC) Moonrise 1:07AMMoonset 3:46PM Illumination 23% Phase: Waning Crescent; Moon at 25 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- 253 Am Pdt Thu Aug 17 2017
.small craft advisory in effect from 1 pm pdt this afternoon through this evening...
Today..SW winds 10 to 20 kt.
Tonight..SW winds 10 to 20 kt.
Fri..SW winds 10 to 20 kt.
Fri night..SW winds 10 to 20 kt.
Sat..SW winds 15 to 25 kt. Patchy fog after midnight.
Sun..SW winds 5 to 15 kt.
Mon..SW winds 5 kt...increasing to 5 to 15 kt.
PZZ500 253 Am Pdt Thu Aug 17 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light variable winds through the day as an east pacific ridge builds inland to the north while a weak trough lingers just to the south. Expect increasing northwest winds beginning late tomorrow and lasting through the weekend as the ridge strengthens further.

7 Day Forecast for Marine Location Near Larkspur, CA
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location: 37.94, -122.53     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 170552
afdmtr
area forecast discussion
national weather service san francisco bay area
1052 pm pdt Wed aug 16 2017

Synopsis A gradual inland warming trend can be expected through
late week as high pressure builds over the region. Overnight and
morning clouds will also be common, especially near the coast and in
the adjacent valleys.

Discussion As of 7:58 pm pdt Wednesday... Per 24 hour comparison
temperatures are for the most part warmer, as much as 10 to 12
degrees warmer in the east bay and dewpoint temperatures are
higher everywhere, in the mid to upper 50s. Along the immediate
coastline however, air temperatures are very close to what they
were yesterday at this hour. Higher dewpoint temperatures indicate
more water vapor in the air particularly air that is in contact
with chilly sea surface temperatures is resulting in widespread
stratus and fog over the coastal waters. The marine layer inversion
continues to strengthen this evening presently based near 2,000
feet, onshore summer breezes will bring stratus and fog inland
tonight and Thursday morning.

It was a typical summer day weather-wise with the usual clearing in
the morning followed by returning stratus and fog this evening.

Average temperatures today were not far from normal for mid august,
departures ranged from -2 degrees to +4 degrees.

As discussed earlier the marine layer will tend to compress into
late week as an eastern pacific mid-upper level high strengthens
over norcal. By the weekend upper level troughing will return. Dry
weather is generally expected through the forecast period.

Prev discussion As of 01:52 pm pdt Wednesday... Temperatures across
the region are generally running a few to several degrees warmer
compared to this time yesterday as clouds cleared out more quickly
and high pressure builds in from the eastern pacific. While low
clouds will likely return to the coast and spread inland again
tonight, they will likely be less widespread compared to previous
days. In addition, the inland warming trend will likely continue
through late week as 850 mb temperatures increase.

With the ridge building in from the eastern pacific through late
week, should see the marine layer compress a bit more and result in
less inland penetration of stratus during the overnight and early
morning hours, especially by Thursday and Friday. Afternoon
temperatures will also rebound to near seasonal averages with 60s to
70s at the coast and 80s to 90s inland. Similar conditions are
likely heading into Saturday as well.

Another mid upper level trough and associated low is forecast to
drop down the west coast late in the upcoming weekend. This will
likely help to cool conditions inland back to below seasonal
averages by Sunday and into early next week. However, this type of
pattern could either help deepen the marine layer and result in more
widespread cloud cover or help to mix conditions out and result in
more sunshine near the coast. Thus, we will have to closely monitor
the latest forecast models as we approach the upcoming weekend.

Regardless, dry weather conditions are generally expected to persist
region-wide through the extended forecast.

Aviation As of 10:45 pm pdt Wednesday... Marine layer has
compressed to 2000 feet and is expected to compress further as an
upper level ridge builds off the coast. Stratus is on track to
spread into the sfo bay area. The only changes to the previous taf
is to raise the cig heights so that sfo and the approach will
stay MVFR overnight.

Vicinity of ksfo... MVFR ceilings after 10z clearing after 17z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR CIGS possibly dipping into ifr
between 12z and 18z.

Marine As of 10:45 pm pdt Wednesday... A weak low pressure
trough along the california coast will keep light winds over the
coastal waters through Thursday. Northwest winds will increase
over the offshore waters late in the week and into the weekend as
high pressure strengthens offshore.

Mtr watches warnings advisories
Tday Sca... Sf bay from 1 pm
public forecast: canepa
aviation: W pi
marine: W pi
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 6 mi51 min ENE 1.9 60°F 1016 hPa
RCMC1 - 9414863 - Richmond, CA 6 mi40 min WSW 6 G 8.9 61°F 65°F1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi40 min SW 8.9 G 12 62°F 1015.4 hPa
FTPC1 - 9414290 - San Francisco, CA 10 mi40 min WSW 6 G 8.9 60°F 62°F1015.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 12 mi40 min WSW 1.9 G 7 60°F 1014 hPa
PXSC1 12 mi40 min 61°F 58°F
46237 - San Francisco Bar, CA (142) 12 mi58 min 60°F5 ft
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi40 min W 6 G 8.9
OBXC1 14 mi40 min 61°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi40 min W 6 G 8 61°F 1015 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi40 min WSW 9.9 G 15 62°F 1014.7 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi40 min W 5.1 G 7 61°F 69°F1015.5 hPa
LNDC1 17 mi40 min WNW 2.9 G 7 62°F 1015 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi38 min S 1.9 G 3.9 58°F 57°F4 ft1015.4 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi40 min W 9.9 G 19 61°F 68°F1015 hPa60°F
PRYC1 - 9415020 - Point Reyes, CA 24 mi40 min ESE 7 G 9.9 62°F 58°F1014.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi40 min WSW 17 G 19 61°F 69°F1014.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 32 mi103 min WNW 11 60°F 1014 hPa58°F
RTYC1 - 9414523 - Redwood City, CA 34 mi40 min W 5.1 G 7 62°F 72°F1014.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 35 mi40 min WNW 14 G 19 62°F 1013.6 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi38 min S 5.8 G 9.7 60°F 61°F7 ft1014.7 hPa (-0.3)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi28 min SE 3.9 G 5.8 56°F 52°F1015.4 hPa (+0.0)55°F

Wind History for Richmond, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA14 mi53 minN 010.00 miOvercast61°F57°F88%1015.2 hPa
Petaluma Municipal Airport, CA22 mi33 minNW 510.00 miOvercast59°F57°F94%1015.2 hPa
Oakland, Metro Oakland International Airport, CA23 mi35 minN 610.00 miOvercast61°F59°F93%1015 hPa
Napa, Napa County Airport, CA23 mi34 minW 710.00 miFair59°F55°F90%1014.1 hPa
San Francisco, San Francisco International Airport, CA24 mi92 minW 510.00 miA Few Clouds60°F54°F80%1015 hPa

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmCalmSW4334SE7NE8SE74NE11N10N11N12N7N5
G10
N7N6NW5CalmCalmCalmCalm
1 day agoCalmCalmCalmS3CalmE5SE75
G12
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CalmSW14SW11E6E6Calm3CalmCalmSW4CalmN4Calm
2 days agoSE3CalmCalmW5
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SW9SW5SW6SW9CalmCalmCalmCalmCalm--

Tide / Current Tables for Corte Madera Creek, San Francisco Bay, California
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Corte Madera Creek
Click for Map
Thu -- 02:07 AM PDT     Moonrise
Thu -- 03:15 AM PDT     0.07 feet Low Tide
Thu -- 06:27 AM PDT     Sunrise
Thu -- 10:11 AM PDT     4.50 feet High Tide
Thu -- 02:57 PM PDT     2.45 feet Low Tide
Thu -- 04:45 PM PDT     Moonset
Thu -- 08:00 PM PDT     Sunset
Thu -- 09:04 PM PDT     6.50 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.71.40.50.10.20.81.62.53.44.24.54.43.83.22.62.52.73.44.45.46.26.56.35.4

Tide / Current Tables for Point San Quentin 1.9 mi E, San Francisco Bay, California Current
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Point San Quentin 1.9 mi E
Click for Map
Thu -- 01:16 AM PDT     -2.59 knots Max Ebb
Thu -- 02:07 AM PDT     Moonrise
Thu -- 05:22 AM PDT     0.01 knots Slack
Thu -- 06:27 AM PDT     Sunrise
Thu -- 08:17 AM PDT     1.59 knots Max Flood
Thu -- 11:29 AM PDT     -0.00 knots Slack
Thu -- 01:56 PM PDT     -1.22 knots Max Ebb
Thu -- 04:45 PM PDT     Moonset
Thu -- 05:11 PM PDT     0.00 knots Slack
Thu -- 07:56 PM PDT     1.30 knots Max Flood
Thu -- 07:59 PM PDT     Sunset
Thu -- 10:46 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.1-2.6-2.5-2-1.3-0.40.61.31.61.51.10.4-0.4-1-1.2-1-0.7-0.10.51.11.31.10.6-0.2

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 (7,2,3,4)
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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.