Thursday, August17, 2017 L-36.com


Marine Weather and Tides
Petaluma, 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 8:03PM Wednesday August 16, 2017 10:55 PM PDT (05:55 UTC) Moonrise 12:15AMMoonset 2:43PM Illumination 26% 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 856 Pm Pdt Wed Aug 16 2017
Tonight..NW winds 5 to 15 kt.
Thu..NW winds 10 kt...increasing to 10 to 20 kt in the afternoon.
Thu night..NW winds 10 to 20 kt...decreasing to 10 kt after midnight.
Fri..NW winds 10 to 20 kt.
Fri night..NW winds 10 to 20 kt.
Sat..SW winds 5 to 15 kt. Patchy fog.
Sun..SW winds 5 to 15 kt. Patchy fog.
Mon..SW winds 5 to 15 kt. Patchy fog.
PZZ500 856 Pm Pdt Wed Aug 16 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... 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.

7 Day Forecast for Marine Location Near Petaluma, CA
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location: 38.22, -122.6     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 170258
afdmtr
area forecast discussion
national weather service san francisco bay area
758 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 4:45 pm pdt Wednesday... Marine layer
remains deep at around 2500 feet but is compressing as an upper
level ridge builds off the coast. A south to southeast flow has
pushed the low clouds out to sea today. This will result in a
later return of low clouds into the sfo bay area tonight.

Vicinity of ksfo...VFR through the airport evening rush. MVFR
ceilings after 09z. West winds to 13-15 kt decreasing after 04z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Clear over the mry bay area today with low
clouds sitting over the outer part of mry bay. These clouds could
quickly rush in when the winds switches back to onshore but the
challenge will be the timing. Ifr CIGS expected to spread inland
after 02z but it could be later than that.

Marine As of 4:45 pm pdt Wednesday... A weak low pressure
trough near the california coast will maintain 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
Tngt Sca... Sf bay until 9 pm
public forecast: canepa
aviation: W pi
marine: dykema
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 21 mi37 min WSW 12 G 14 63°F 1014.2 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi43 min SW 5.1 G 9.9 62°F 63°F1014.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi43 min WSW 8.9 60°F 1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi37 min SW 14 G 16 62°F 1015 hPa
PRYC1 - 9415020 - Point Reyes, CA 25 mi37 min ESE 4.1 G 6 62°F 57°F1014.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi37 min WSW 13 G 17 63°F 69°F1014.4 hPa59°F
FTPC1 - 9414290 - San Francisco, CA 29 mi43 min SW 8.9 G 13 60°F 60°F1015.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 30 mi70 min W 9.9 64°F 1013 hPa58°F
46237 - San Francisco Bar, CA (142) 30 mi55 min 58°F5 ft
PXSC1 31 mi37 min 62°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi37 min WSW 8.9 G 14 61°F 1014 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi37 min W 9.9 G 12 62°F 1015 hPa
PCOC1 - 9415144 - Port Chicago, CA 32 mi37 min WSW 13 G 19 64°F 71°F1013.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi37 min W 8.9 G 12
OBXC1 32 mi37 min 62°F 58°F
LNDC1 34 mi37 min WNW 6 G 8 62°F 1015.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi65 min S 3.9 G 5.8 60°F 58°F5 ft1015.4 hPa (+1.0)
AAMC1 - 9414750 - Alameda, CA 35 mi37 min WNW 6 G 9.9 62°F 69°F1015.5 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi25 min S 3.9 G 5.8 57°F 53°F1015.4 hPa56°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi37 min WNW 14 G 19 66°F 1013 hPa

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi60 minVar 6 G 119.00 miOvercast61°F57°F88%1014.9 hPa
Novato / Gnoss Field, CA6 mi60 minNNW 610.00 miFair61°F55°F83%1014.9 hPa
Napa, Napa County Airport, CA17 mi61 minW 1010.00 miFair63°F55°F78%1013.2 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi62 minSSE 410.00 miFair59°F55°F87%1013.9 hPa

Wind History from O69 (wind in knots)
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Last 24hrCalmCalmSW4CalmCalmCalmCalmCalmCalmCalmCalmCalm4Calm36
G13
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G11
1 day agoCalmCalmSW3SW4CalmN3CalmSE33E6NE433
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2 days ago4W6
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W11W10W7SW4SW843

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Thu -- 02:07 AM PDT     Moonrise
Thu -- 05:23 AM PDT     0.05 feet Low Tide
Thu -- 06:27 AM PDT     Sunrise
Thu -- 11:45 AM PDT     5.17 feet High Tide
Thu -- 04:46 PM PDT     Moonset
Thu -- 05:04 PM PDT     2.11 feet Low Tide
Thu -- 08:00 PM PDT     Sunset
Thu -- 10:38 PM PDT     7.47 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.74.42.91.50.50.10.20.91.93.14.255.24.843.12.42.12.53.54.96.37.37.4

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Thu -- 12:36 AM PDT     -0.84 knots Max Ebb
Thu -- 02:06 AM PDT     Moonrise
Thu -- 04:51 AM PDT     0.00 knots Slack
Thu -- 06:26 AM PDT     Sunrise
Thu -- 07:52 AM PDT     0.50 knots Max Flood
Thu -- 10:56 AM PDT     -0.00 knots Slack
Thu -- 01:20 PM PDT     -0.41 knots Max Ebb
Thu -- 03:50 PM PDT     0.00 knots Slack
Thu -- 04:45 PM PDT     Moonset
Thu -- 06:27 PM PDT     0.71 knots Max Flood
Thu -- 07:59 PM PDT     Sunset
Thu -- 10:02 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.8-0.8-0.6-0.300.30.50.50.40.2-0-0.3-0.4-0.4-0.20.10.50.70.70.60.30-0.4

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 (1,6,7,8)
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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.