Sunday, October20, 2019 L-36.com


Marine Weather and Tides
Petaluma, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:23AMSunset 6:27PM Sunday October 20, 2019 2:11 PM PDT (21:11 UTC) Moonrise 10:44PMMoonset 12:53PM Illumination 53% Phase: Third Quarter Moon; Moon at 22 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 The San Francisco Bay North Of The Bay Bridge- 828 Am Pdt Sun Oct 20 2019
Today..W winds 5 to 10 kt.
Tonight..NW winds up to 10 kt.
Mon..W winds up to 10 kt.
Mon night..SW winds around 5 kt.
Tue..N winds up to 10 kt.
Tue night..W winds around 5 kt with gusts up to 30 kt.
Wed..N winds 5 to 15 kt.
Thu..NE winds 5 to 15 kt.
PZZ500 828 Am Pdt Sun Oct 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific and lower pressure inland will result in moderate northerly winds over the coastal waters today. Winds will be locally stronger south of Monterey bay along the coast. Northerly winds will increase this evening over the north of point reyes and over the outer waters. These gusty winds will result in hazardous conditions. A moderate northwest swell will also continue to moves through the coastal waters.


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 201730
afdmtr
area forecast discussion
national weather service san francisco bay area
1030 am pdt Sun oct 20 2019

Synopsis A warming and drying trend will begin today and
continue through Thursday as high pressure strengthens over
california. In addition, offshore flow will develop by Monday, and
increase by midweek, which will result in warm temperatures
reaching all the way to the coast. Locally gusty offshore winds
may develop at times in the hills, especially in the north bay
hills on Wednesday night and Thursday morning. In the longer
range, cooling is forecast next weekend.

Discussion As of 08:00 am pdt Sunday... Low level moisture
developed into low clouds and patchy fog overnight across portions
of the south bay, monterey coast, and salinas valley early this
morning. These clouds and patchy fog have already begun to mix out
and should dissipate by mid morning.

High pressure will begin to build into the state today, marking
the beginning of a warming drying trend that will extend through
much of the upcoming week. Temperatures this afternoon will run
around 2 to 5 degrees warmer than yesterday, with highs in the mid
60s to low 70s along most of the coast, and mid 70s to around 80
inland. By tomorrow, afternoon temperatures will be tangibly
warmer and the first day of this warming trend to see above
seasonal normal temperatures. Thursday looks to be the warmest
day of the upcoming week with highs along the coast in the 70s to
around 80 while inland areas will range in the 80s to around 90. One
forecast challenge today will be to determine if temperatures
need to be ramped up slightly on Thursday as models tend to
struggle to capture the extent of warming coastal areas see during
our fall offshore flow warming trends.

Speaking of offshore, north to northeast winds are forecast to
gradually increase as the sfo-wmc gradient increases through the
upcoming week, peaking later Wednesday into Thursday.

In addition to these winds, the unseasonably warm dry air mass
associated with the building high pressure will lead to increase
fire weather risk, particularly across the higher elevations of
the north bay. Longer term ensemble guidance is also picking up on
the possibility of another offshore wind event by next weekend,
however, that could change if the modeled trajectory and
positioning of the "insider slider" system shifts over the coming
days. See previous discussion for more information on the current
forecast.

Previous discussion As of 3:10 am pdt Sunday... Satellite fog
product shows residual low clouds along the coast from about half
moon bay south through the monterey bay, and extending into the
salinas valley. Patchy fog is also around with sts reporting 3
miles visibility, and salinas is at 5 miles. Dry air moving in
from the north by morning should serve to clear out these low
clouds and patchy fog.

An upper level ridge over the eastern pacific will build and shift
eastward over the next several days. This will result in a warming
trend, especially by Monday and Tuesday. High temps today are
expected to only be a few degrees warmer than Saturday, with a
5-10 degree jump by Monday. High temperatures to level out by
midweek, but warmest inland areas could approach 90 degrees over
this time frame.

In addition to the warming temperatures, offshore flow is forecast
to develop. The warming and drying conditions coupled with
offshore flow will bring the potential for critical fire weather
conditions, especially after midweek when gusty offshore winds
could be the strongest. However 00z model runs have weakened the
forecast gradients somewhat, with the GFS indicating only about 6
mb from wmc-sfo Tuesday and Wednesday nights. The ECMWF is
substantially less than this. But, as previously noted, even if
winds aren't extremely high, the prolonged warming and drying of
the atmosphere will still make for potentially critical fire
weather conditions. Cooler weather is indicated by next weekend as
an upper level trough drops southward from western canada.

Aviation As of 10:29 am pdt Sunday... Morning clouds and patchy
fog continue to dissipate with all terminals becomingVFR. Expect
vfr through much of tonight. Latest guidance suggests some
increasing low level moisture over the coastal waters tonight with
patchy CIGS developing along the coast and around monterey bay
region. Confidence is low for another round of fog tonight, but
with develop NE flow decided to keep fog out for now.

Vicinity of ksfo...VFR. West wind increasing and becoming gusty to
20 to 25 knots from 21z today to 05z this evening. Light ne
overnight.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals...VFR this afternoon and early tonight.

Some patchy CIGS and fog may impact sns and mry tomorrow morning.

Fire weather As of 3:55 pm pdt Saturday... Heightened fire
weather concerns are expected next week as periods of offshore
flow combine with gusty winds at times to create critical to near
critical fire weather conditions. Locally breezy northwest to
north winds are expected in the hills Sunday, but relative
humidity values will remain somewhat elevated. A warming and
drying trend will get underway on Sunday, and especially on
Monday, as high pressure builds over california and offshore flow
develops. Offshore flow will mostly be light through Tuesday
night, except locally moderate and gusty at times in the hills.

Relative humidity values will drop into the teens by Monday
afternoon and very poor overnight humidity recoveries are expected
in the hills starting Monday night. Warm and very dry conditions
will then persist for the remainder of next week. The period of
greatest concern is Wednesday night and Thursday morning when some
models indicate the potential for strong and gusty north to
northeast winds in the hills, mainly across the higher elevations
of the north bay. Fire weather watches and or red flag warnings
may be issued over the next few days if critical fire weather
conditions are deemed likely to occur.

Marine As of 10:24 am pdt Sunday... High pressure over the
eastern pacific and lower pressure inland will result in moderate
northerly winds over the coastal waters today. Winds will be
locally stronger south of monterey bay along the coast. Northerly
winds will increase this evening over the north of point reyes and
over the outer waters. These gusty winds will result in hazardous
conditions. A moderate northwest swell will also continue to moves
through the coastal waters.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 11 am
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pt reyes 0-10 nm from 1 pm
sca... Pt reyes to pigeon pt 0-10 nm from 1 pm
public forecast: drp
aviation: mm
marine: mm
fire weather: 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 mi54 min SW 2.9 G 4.1 64°F 1019.9 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi54 min 59°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi61 min SE 7 65°F 1020 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi60 min SSW 9.9 G 12 63°F 1020.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 25 mi60 min 53°F1021 hPa
UPBC1 28 mi54 min W 8.9 G 9.9
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi60 min WNW 8 G 8.9 68°F 63°F1020.2 hPa44°F
FTPC1 - 9414290 - San Francisco, CA 29 mi60 min SW 8 G 11 62°F 57°F1020.9 hPa
46237 - San Francisco Bar, CA (142) 30 mi72 min 55°F6 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi87 min SSW 1.9 73°F 1021 hPa43°F
PXSC1 31 mi54 min 68°F 42°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi60 min ESE 4.1 G 5.1 65°F 1019.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi60 min SW 1.9 G 2.9
PCOC1 - 9415144 - Port Chicago, CA 32 mi60 min W 9.9 G 11 69°F 63°F1020.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi60 min WNW 1.9 G 4.1 62°F 1020.6 hPa
OBXC1 32 mi54 min 65°F 51°F
LNDC1 34 mi60 min WNW 4.1 G 6 68°F 1020.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi42 min NW 9.7 G 14 56°F 53°F1021.6 hPa
AAMC1 - 9414750 - Alameda, CA 35 mi60 min WSW 2.9 G 4.1 63°F 61°F1021.1 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi42 min WNW 14 G 16 52°F1021.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi60 min NW 2.9 G 6 70°F 1019.9 hPa

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi37 minVar 6 G 1210.00 miFair75°F41°F29%1020 hPa
Novato / Gnoss Field, CA6 mi17 minNW 6 G 1310.00 miFair77°F41°F28%1019.6 hPa
Napa, Napa County Airport, CA17 mi18 minSSW 610.00 miFair74°F39°F29%1018.5 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi19 minNNE 810.00 miFair79°F44°F29%1018.9 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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CalmSW5SW6E4N3CalmNW9NW10N8NW6CalmNW9
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Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
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Sun -- 01:35 AM PDT     0.11 feet Low Tide
Sun -- 07:24 AM PDT     Sunrise
Sun -- 08:25 AM PDT     5.03 feet High Tide
Sun -- 01:44 PM PDT     2.71 feet Low Tide
Sun -- 01:52 PM PDT     Moonset
Sun -- 06:25 PM PDT     Sunset
Sun -- 06:38 PM PDT     6.15 feet High Tide
Sun -- 11:44 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.20.20.71.62.73.74.5554.53.93.22.82.73.24.15.266.15.85.142.8

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Sun -- 01:00 AM PDT     0.00 knots Slack
Sun -- 03:57 AM PDT     0.48 knots Max Flood
Sun -- 07:23 AM PDT     Sunrise
Sun -- 08:00 AM PDT     -0.00 knots Slack
Sun -- 10:00 AM PDT     -0.26 knots Max Ebb
Sun -- 12:25 PM PDT     0.00 knots Slack
Sun -- 01:51 PM PDT     Moonset
Sun -- 02:56 PM PDT     0.55 knots Max Flood
Sun -- 06:01 PM PDT     -0.00 knots Slack
Sun -- 06:25 PM PDT     Sunset
Sun -- 09:26 PM PDT     -0.86 knots Max Ebb
Sun -- 11:43 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-00.30.40.50.50.40.2-0-0.2-0.3-0.2-0.10.20.40.50.50.30-0.3-0.7-0.8-0.8-0.7

Weather Map
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GEOS 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 (17,4,5,8)
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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.