Wednesday, November25, 2020
Privacy Policy
L-36.com

Marine Weather and Tides
Petaluma, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:01AMSunset 4:53PM Wednesday November 25, 2020 3:45 AM PST (11:45 UTC) Moonrise 2:49PMMoonset 2:31AM Illumination 77% 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
    EDIT      (on/off)   Help
PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 308 Am Pst Wed Nov 25 2020
.small craft advisory in effect from noon pst today through this evening...
Today..NW winds 10 to 20 kt.
Tonight..NW winds 10 to 20 kt with gusts up to 30 kt.
Thanksgiving day..N winds 15 to 25 kt with gusts up to 35 kt.
Thu night..NE winds 5 to 15 kt.
Fri..E winds up to 10 kt.
Fri night..NE winds up to 10 kt.
Sat..NE winds around 5 kt.
Sun..N winds around 5 kt.
PZZ500 308 Am Pst Wed Nov 25 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase today through Thursday following a frontal passage. Gusty winds will generate steep fresh swell hazardous for small craft vessels. A large long period northwest swell train will arrive this morning and continue through Thursday.


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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS66 KMTR 251124 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 324 AM PST Wed Nov 25 2020

SYNOPSIS. A mainly dry cold front will pass through the Bay Area this morning. Gusty northwest winds in the hills will usher in cooler temperatures this afternoon as skies turn partly cloudy. As the front passes winds will reverse and northerly offshore winds will develop overnight into Thanksgiving morning. Breezy winds in the hills may mix into lower elevations during the day as much drier air filters over the region. The offshore winds will allow temperatures to warm into the mid 60s most areas Thanksgiving afternoon. High pressure builds Friday through the weekend with sunny and mild days followed by clear and cool nights. A possible chance of light rain in the North Bay Monday.

DISCUSSION. as of 3:24 AM PST Wednesday . Cold front is passing through the North Bay at this time with increasing northwest winds in the hills. Mt Tamalpais is gusting to 36 mph with gusts to around 25 mph for the hills of coastal Sonoma. Not seeing any tips of the rain bucket as the boundary looks mainly dry. Some local drizzle or some sprinkles could occur as the boundary interacts with lingering boundary/marine layer moisture. Dense fog down to 1/4 mile is being reported at Sonoma/Napa and Novato but the strength of the cold advection and winds aloft should disrupt this shortly after sunrise if not sooner. The main impact of the front will be a noted cooling trend this afternoon with highs upper 50s at the coast and low to mid 60s elsewhere.

By tonight a well defined upper trough will carve out over the Great Basin inducing a fairly robust offshore/northerly wind pattern by early Thanksgiving morning. Northeast winds will develop overnight and peak between 12-21z Thanksgiving Day. The strongest winds will be confined to the hills with gusts 30-40 mph on average though the usual windy spots of Mt Saint Helena and Diablo will likely gust in excess of 50 mph. The surface pattern and atmospheric profile should allow some of those winds to mix down around 16-18z as the morning inversion breaks so those setting up for outdoor plans on Thanksgiving morning may notice gusty northeast winds, especially downwind of the North/East Bay hills. The northeast wind pattern will usher in a much drier air mass. Though fire danger has been lowered due to some rain earlier this month it's worth noting that fire danger will be increasing as offshore winds and lowering humidity coincide on Thanksgiving Day. The northeast wind pattern will be favorable for adiabatic downslope warming, especially in the North Bay where temps may warm into the upper 60s as well as around Oakland/Berkeley as winds come off Mt Diablo and the East Bay Hills.

As the sun goes down Thursday evening temperatures will drop quickly as the airmass will be very dry. Overnight lows in the 40s around the Bay with 30s for the interior valleys. There will be another round of breezy east/northeast winds in the hills Thursday night that will continue to usher in a drier airmass. The winds will keep temps somewhat milder in the hills but valleys that decouple (North Bay) will quickly cool in the lower-mid 30s by Friday morning.

High pressure builds Friday through Sunday with sunny and mild days. Expect highs mid 60s with even some lower 70s for the Central Coast. Nights will continue to be cool, mainly due to the airmass being very dry so expect 30s in the interior valleys even though the overall airmass will be moderating.

Last few runs of the operational gfs and 00z ecmwf bring a weak system onshore around Cape Mendocino later Monday into Tuesday. This could bring a shot of light rain to the North Bay though ensemble guidance isn't too bullish yet. Will continue to monitor trends but rain chances drop to near zero from the Golden Gate southward with the Monday system.

General trend beyond that shows midweek drying then some signals that some jet energy will try and weaken the ridge by around Dec 2nd-3rd with another chance of rain then as a front tries to move onshore. Teleconnections suggests the PNA remains positive (ridge) through mid December before going negative (trough) the 2nd half of December.

AVIATION. As of 10:13 PM PST Tuesday . For the 06z TAFs. It's VFR except fog and low clouds /VLIFR-MVFR/ continue developing on the coast and inland, through radiational cooling and arriving by wind advection. A cold front over NorCal is moving southeast 30-35 mph and will move over the forecast area late tonight and early Wednesday morning. Surface winds converging along the cold front will also increase areal coverage of VLIFR-MVFR conditions through tonight, possibly generating spotty light rain tonight to isolated showers in the post frontal air mass Wednesday. Guidance doesn't show gusty winds tonight or Wednesday, however given the coupling of mid-lower level dynamics, moderate speed and slope of the incoming front winds may briefly pick up to around 25 or 30 knots with frontal passage. Lower level winds will be gusty over the coastal waters with gusty winds overlapping Sonoma, Marin, possibly San Francisco and San Mateo Counties tonight; amended KSTS and KSFO to include low level wind shear tonight/Wednesday morning. Post frontal diurnal mixing should help mitigate any potential for low level wind shear Wednesday. Drier conditions Wednesday and Wednesday night for VFR at the terminals.

Vicinity of KSFO . MVFR, west to northwest wind near 10 knots late tonight and Wednesday morning, TAF has vicinity showers. The 18z/00z NAM output show spotty light rain/drizzle tonight and Wednesday morning KSFO to KOAK to KSJC. Amended TAF to include low level wind shear 12z-18z Wednesday. If mixing around frontal passage is robust, surface winds may briefly become gusty to 20-30 knots without a lower level temperature inversion in place. Momentum transfer of gusty NW winds aloft can reach the surface more easily without an inversion and when moderate or strong mid level dynamics accompany a front.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR-LIFR in fog and low clouds increasing in coverage and advancing inland tonight. Mixing will lift ceilings and visibilities to MVFR-VFR overnight and Wednesday morning with spotty light rain/drizzle possible. VFR forecast Wednesday afternoon and evening.

MARINE. as of 3:00 AM PST Wednesday . Northwest winds will increase today through Thursday following a frontal passage. Gusty winds will generate steep fresh swell hazardous for small craft vessels. A large long period northwest swell train will arrive this morning and continue through Thursday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. High Surf Advisory . CAZ006-505-509-530 SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Mry Bay from 9 AM



PUBLIC FORECAST: RWW AVIATION: W Pi MARINE: W Pi

Visit us at www.weather.gov/sanfrancisco

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/nwsbayarea www.twitter.com/nwsbayarea www.youtube.com/nwsbayarea


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 21 mi45 min WSW 7 G 8.9 53°F 1020.8 hPa (+0.5)
RCMC1 - 9414863 - Richmond, CA 23 mi45 min W 1.9 G 2.9 55°F 56°F1021.2 hPa (+0.4)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi28 min Calm 54°F 1021 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi45 min ESE 5.1 G 6 54°F 1021.7 hPa (+0.5)
UPBC1 28 mi45 min W 13 G 15
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi45 min W 8.9 G 9.9 52°F 56°F1020.8 hPa (+0.5)
FTPC1 - 9414290 - San Francisco, CA 29 mi45 min SW 4.1 G 8.9 52°F 56°F1021.7 hPa (+0.6)
46237 - San Francisco Bar, CA (142) 30 mi45 min 54°F5 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi60 min W 6
PXSC1 31 mi45 min 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi45 min SE 4.1 G 5.1 53°F 1020.3 hPa (+0.4)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi45 min SE 2.9 G 2.9
PCOC1 - 9415144 - Port Chicago, CA 32 mi45 min SSW 7 G 8.9 51°F 56°F1020.5 hPa (+0.6)
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi45 min ESE 1.9 G 2.9 51°F 1021.4 hPa (+0.5)
OBXC1 32 mi45 min 52°F 51°F
LNDC1 34 mi45 min ESE 1.9 G 4.1 52°F 1021.3 hPa (+0.4)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi25 min NNW 7.8 G 12 53°F1021.8 hPa
AAMC1 - 9414750 - Alameda, CA 35 mi45 min Calm G 1.9 53°F 56°F1021.6 hPa (+0.4)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi25 min NW 19 G 25 52°F 52°F1021.3 hPa49°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi45 min WNW 11 G 14 54°F 1019.9 hPa (+0.0)

Wind History for Richmond, CA
(wind in knots)    EDIT      (on/off)   Help
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
Last
24hr
NW2
NW2
N2
NW2
W2
NW2
SE1
S2
S4
SE2
G5
SE3
G8
S8
G11
S7
S5
S7
G11
S6
SW1
N2
W3
S3
W2
NW6
G9
W3
NW2
1 day
ago
NW4
NW7
W4
W4
NW5
NW4
NW2
NW1
SE2
S2
G5
S4
S4
G8
SE6
S3
NW2
NW6
NW5
NW4
NW3
NW2
SE1
--
NW3
W2
2 days
ago
N4
NW5
NW1
N4
NW5
E2
G5
SE2
SE3
SE3
G6
S8
SW8
G11
NW6
NW8
G11
NW10
NW6
N2
N3
NW3
S4
SE6
SE3
SE4
G7

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi50 minN 010.00 miOvercast46°F46°F100%1021.3 hPa
Novato / Gnoss Field, CA6 mi70 minN 00.15 miFog43°F42°F100%1021.3 hPa
Napa, Napa County Airport, CA17 mi51 minN 00.25 miFog39°F37°F93%1020.2 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi52 minN 00.25 miFog40°F39°F100%1020.3 hPa

Link to 5 minute data for KO69

Wind History from O69 (wind in knots)
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmW54
G10
NW45NW5CalmCalmCalmCalmNW3W5NW4CalmCalmCalm
1 day agoW8W4CalmNW4W4W66W95W9SW7W9SW6
G11
W5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmW4W95
G12
W8W9W7W6NW5W6CalmN3CalmCalmCalmNW3CalmCalmCalmW3

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Upper drawbridge
Click for Map
Wed -- 02:31 AM PST     Moonset
Wed -- 04:41 AM PST     1.00 feet Low Tide
Wed -- 07:02 AM PST     Sunrise
Wed -- 10:34 AM PST     6.52 feet High Tide
Wed -- 02:49 PM PST     Moonrise
Wed -- 04:52 PM PST     Sunset
Wed -- 05:54 PM PST     0.90 feet Low Tide
Wed -- 11:04 PM PST     5.01 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
4.23.42.41.61.111.62.84.25.56.46.565.13.92.71.71.10.91.42.43.64.65

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Petaluma River Approach
Click for Map
Wed -- 12:28 AM PST     -0.65 knots Max Ebb
Wed -- 02:31 AM PST     Moonset
Wed -- 03:30 AM PST     0.00 knots Slack
Wed -- 06:41 AM PST     0.73 knots Max Flood
Wed -- 07:01 AM PST     Sunrise
Wed -- 10:05 AM PST     -0.01 knots Slack
Wed -- 01:24 PM PST     -0.80 knots Max Ebb
Wed -- 02:48 PM PST     Moonrise
Wed -- 04:43 PM PST     0.00 knots Slack
Wed -- 04:51 PM PST     Sunset
Wed -- 07:18 PM PST     0.51 knots Max Flood
Wed -- 10:12 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
-0.6-0.6-0.5-0.20.20.50.70.70.60.40-0.3-0.6-0.8-0.8-0.6-0.20.10.40.50.50.30.1-0.3

Weather Map
       (on/off)   Help Weather Map
wmap_P
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Sacramento, CA
   (on/off)   Help
weather_mapweather_map weather_map


Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. Google supplies the ads on this site. Because I do not track who you are, I cannot customize how these ads are served. They may be personalized to improve the ad experience. If you do not want personalized ads, please adjust the settings on the Google site HERE. NOTE: The best I can determine, this site is not subject to CCPA but I am doing my best to comply anyway.
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 numerous 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.