Wednesday, August16, 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 8:23 AM PDT (15:23 UTC) Moonrise 12:15AMMoonset 2:43PM Illumination 31% Phase: Waning Crescent; Moon at 24 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- 242 Am Pdt Wed Aug 16 2017
.small craft advisory in effect from 9 am pdt this morning through this evening...
Today..SW winds 10 to 20 kt. Patchy fog in the morning. Patchy drizzle in the morning.
Tonight..SW winds 10 to 20 kt.
Thu..SW winds 10 to 20 kt.
Thu night..SW winds 10 to 20 kt.
Fri..SW winds 10 to 20 kt.
Sat..SW winds 5 to 15 kt.
Sun..SW winds 10 kt.
PZZ500 242 Am 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... East pacific ridge builds towards the coast resulting in lighter winds overall. Some locally gusty winds over the northern outer waters and northern san francisco bay through the afternoon.

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 161155
afdmtr
area forecast discussion
national weather service san francisco bay area
455 am pdt Wed aug 16 2017

Synopsis Temperatures will warm through the week as a ridge of
high pressure builds into our region. Clouds can be expected ever
night especially for locations near the coast.

Discussion As of 3:00 am pdt Wednesday... Another round of
widespread clouds overnight with virtually all urban locations
seeing clouds at this hour. Surface gradient has gone directly
from the west around 1.5 mb with a marine layer still over 2000
feet, so most spots will be cloudy through the morning hours. By
afternoon should see burn-off toward the coast. A ridge of high
pressure that is slowly building toward our region will help to
push temperatures up a few degrees especially well away from the
coast. Highs will generally be in the 60s at the coast with 70s
and 80s inland. Far eastern spots will go into the lower 90s.

Temperatures will trend warmer the next several days as the
ridge continues to progress toward our region. At the same time
850 mb temperates will warm 1 to 2 c each day. Highs will return
to warmer than normal levels for far inland spots with mid 80s
to upper 90s likely. However, elevated heat risk levels will
generally remain low. At the coast a continued onshore flow with
waters in the upper 50s to lower 60s will keep temperatures on the
cool side.

An upper level low will drop into our region by next work week.

This will lower inland highs, however it could lead to more
disruption to the stratus which would mean more sunshine at the
coast.

Aviation As of 4:50 am pdt Wednesday... Marine layer reacting
to east pacific ridge building towards coast by thinning by at
least 1500 feet since yesterday morning. Cloud bases at or around
1400-1800 feet this morning may drop another 100-200 feet through
the early morning, with tops 2400-2600 feet. Ksts is ifr while
other sites are MVFR. Key difference is the slope of warmer air
above the marine layer from north to south. Thinner marine layer
will mix burn off quicker than yesterday as reflected in the taf.

This trend continues into tomorrow, with continued compression and
thinning of the marine layer with warm air advection at the top
of the marine inversion. Otherwise, light to breezy onshore winds
(strongest in the afternoon).

Vicinity of ksfo... Light onshore winds becoming breezy in
afternoon. MVFR CIGS will linger until at least 16z-17z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR CIGS through most of the day around
the lip of the bay with some brief midday clearing. Light to
occasionally breezy onshore winds by the afternoon.

Marine As of 04:47 am pdt Wednesday... East pacific ridge builds
towards the coast resulting in lighter winds overall. Some locally
gusty winds over the northern outer waters and northern san
francisco bay through the afternoon.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm until 9 am
sca... Sf bay from 9 am
public forecast: bell
aviation: drp
marine: drp
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 mi53 min W 7 G 11 61°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi53 min S 6 G 7 60°F 65°F1014.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi66 min SE 2.9 59°F 1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi53 min SW 6 G 8 60°F 1014.8 hPa
PRYC1 - 9415020 - Point Reyes, CA 25 mi53 min W 1 G 2.9 60°F 55°F1014 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi53 min W 7 G 8.9 61°F 69°F1014.4 hPa58°F
FTPC1 - 9414290 - San Francisco, CA 29 mi53 min SW 4.1 G 6 58°F 61°F1014.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 30 mi98 min WNW 5.1 55°F 1013 hPa54°F
46237 - San Francisco Bar, CA (142) 30 mi53 min 59°F4 ft
PXSC1 31 mi53 min 61°F 56°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi53 min NNE 1 G 2.9 60°F 1013.5 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi53 min WSW 4.1 G 6 61°F 1014.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 32 mi53 min SW 7 G 9.9 60°F 69°F1014 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi53 min WSW 8 G 9.9
OBXC1 32 mi53 min 60°F 56°F
LNDC1 34 mi53 min WSW 5.1 G 7 61°F 1014.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi93 min S 1.9 G 3.9 57°F 55°F4 ft1014.1 hPa (+0.8)
AAMC1 - 9414750 - Alameda, CA 35 mi53 min SW 4.1 G 5.1 61°F 67°F1015 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi43 min ESE 5.8 G 9.7 53°F 52°F1014.3 hPa53°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi53 min WNW 9.9 G 14 62°F 1013.4 hPa

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
Petaluma Municipal Airport, CA3 mi28 minN 09.00 miOvercast55°F53°F94%1014.6 hPa
Novato / Gnoss Field, CA6 mi48 minWNW 310.00 miOvercast59°F53°F82%1014.6 hPa
Napa, Napa County Airport, CA17 mi29 minN 510.00 miOvercast59°F53°F81%1013.6 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi30 minN 04.00 miFog/Mist56°F52°F87%1013.7 hPa

Wind History from DVO (wind in knots)
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Last 24hrS3CalmE5SE75
G12
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G11
CalmSW14SW11E6E6Calm3CalmCalmSW4CalmN4CalmCalmCalmCalm
1 day agoW5
G12
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G17
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G13
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G23
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SW9SW5SW6SW9CalmCalmCalmCalmCalm--CalmCalmCalm
2 days agoCalmCalmCalmE7E7SE7SW15SW16
G22
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G16
5NE5Calm--CalmE4NE6CalmSE3CalmCalm

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Wed -- 01:15 AM PDT     Moonrise
Wed -- 04:18 AM PDT     0.43 feet Low Tide
Wed -- 06:26 AM PDT     Sunrise
Wed -- 10:32 AM PDT     4.83 feet High Tide
Wed -- 03:43 PM PDT     Moonset
Wed -- 03:56 PM PDT     2.04 feet Low Tide
Wed -- 08:02 PM PDT     Sunset
Wed -- 09:38 PM PDT     7.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.32.91.70.80.50.61.22.23.24.24.74.84.43.62.82.222.53.54.86.27.17.26.7

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Wed -- 01:14 AM PDT     Moonrise
Wed -- 03:45 AM PDT     0.00 knots Slack
Wed -- 06:25 AM PDT     Sunrise
Wed -- 06:35 AM PDT     0.43 knots Max Flood
Wed -- 09:41 AM PDT     -0.00 knots Slack
Wed -- 12:05 PM PDT     -0.42 knots Max Ebb
Wed -- 02:46 PM PDT     0.00 knots Slack
Wed -- 03:42 PM PDT     Moonset
Wed -- 05:24 PM PDT     0.73 knots Max Flood
Wed -- 08:01 PM PDT     Sunset
Wed -- 09:04 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.7-0.5-0.20.10.30.40.40.30.2-0.1-0.3-0.4-0.4-0.20.10.50.70.70.60.30-0.4-0.7

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 (11,2,3,4)
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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.