Wednesday, May27, 2020
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Marine Weather and Tides
Petaluma, CA

Version 3.4
NOTICE
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 5:49AMSunset 8:26PM Wednesday May 27, 2020 12:20 AM PDT (07:20 UTC) Moonrise 9:11AMMoonset 12:00AM Illumination 26% Phase: Waxing Crescent; Moon at 5 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- 906 Pm Pdt Tue May 26 2020
Tonight..SW winds 5 to 15 kt.
Wed..SW winds 10 to 20 kt with gusts up to 25 kt.
Wed night..SW winds 5 to 15 kt.
Thu..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu night..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri..SW winds 10 to 20 kt with gusts up to 25 kt. A chance of showers.
Sat..SW winds 5 to 15 kt. A chance of showers.
PZZ500 906 Pm Pdt Tue May 26 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Breezy northwest winds will persist over the northern waters through Wednesday. These winds will generate steep fresh swell resulting in hazardous seas conditions for small crafts. Generally light to moderate northwest winds are expected elsewhere with winds generally easing across the waters late this week as an upper ridge sits over california and an upper low slowly approaches from the southwest. Mixed seas will continue with a short period northwest swell and a longer period southwest swell. A longer period northwest swell will arrive later this week.


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 270533 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1033 PM PDT Tue May 26 2020

SYNOPSIS. Very warm to hot daytime temperatures will continue in the farther inland areas through Thursday. Thus, a Heat Advisory remains in effect across the interior. Some cooling will take place along the coast and immediately around the bays on Wednesday. Then Wednesday night and Thursday, the marine layer and coastal stratus are projected to redevelop, with low cloudiness moving locally inland Thursday morning. Cooler afternoon temperature are expected for the coastal valleys Thursday and districtwide Friday as the marine layer deepens and onshore flow increases. There is a chance of rain showers late Friday night into Saturday when isolated thunderstorms will also be possible.

DISCUSSION. as of 9:25 PM PDT Tuesday . Clear skies and mild to warm temperatures prevail across the district this evening following a pretty toasty afternoon, especially inland. A number of record high temperatures for the date were set (see SFORERMTR), with Concord Airport, Livermore Airport and Gilroy all reaching 102 deg, the first time in 2020 each has made it up to or exceeded the 100 deg mark. Will also note that for the first time this year we're seeing temperatures remain quite warm overnight up in the hills. Several of the RAWS sites reported lows last night in the mid 70s.

Basic forecast picture remains unchanged, though just received 00Z run of the NAM model indicates redevelopment of the marine layer and return of the coastal stratus beginning Wednesday night and Thursday morning, earlier than previously anticipated. Wednesday afternoon highs looks to be pretty similar to those today inland, and a little cooler near the coast as onshore flow increases a bit.

Forecasts for tonight and tomorrow appear on track, and no updates presently anticipated.

PREV DISCUSSION. As of 2:29 PM PDT Tuesday . A 589 dm 500mb ridge of high pressure remains positioned just off of the southern California coast and extends northward through the San Francisco Bay Area. As a result, 850mb temperatures range from 21 to 23 deg C across much of the region with interior surface temperatures well into the 90s. Meanwhile, onshore flow near the coast has held temperatures in the 60s (immediate coast) to lower 80s (such as in Downtown San Francisco). Sky conditions also remain generally clear region-wide with a few to scattered high clouds advecting inland over northern California and small "puff" of lower clouds/fog well offshore of the Monterey Bay.

The aforementioned ridge axis aloft is forecast to shift inland during the next 24 hours or so yet 850mb temperatures will continue to warm. Thus, interior locations will remain very warm tomorrow with widespread 90s again in the interior, yet 2-5 deg F cooler potentially. Additional cooling is likely to occur near the coast as onshore flow begins to increase yet temperatures will still be well above seasonal averages.

As the ridge shifts further to the east on Thursday, cooling will continue to occur region-wide with the most relief likely near the coast. Will continue the Heat Advisory over the interior through Thursday evening regardless of the modest cool down given the cumulative impact of the prolonged very warm to hot temperatures and limited overnight cooling.

By Friday, inland areas cool by as much as 10 degrees (about 20 from the peak of this heat event) as the ridge moves into the Desert Southwest and Great Basin and a mid/upper level low begins to approach the central/southern California coast. This will help to usher in much cooler marine air and finally put an end to this heat event. Precipitation chances will also increase late Friday into Saturday as the system lifts northward while advecting deeper moisture across the region. As the core of the low moves inland over the San Francisco Bay Area and northern California on Saturday, there will also be the potential for isolated thunderstorm. Have added a slight chance of thunderstorms to the forecast for locations north of the Golden Gate as the NBM has also increased probabilities to above 20 percent. It will be important to monitor this closely as the development of thunderstorm may produce dry lightning as rainfall will likely be limited. Longer range guidance indicates continued unsettled weather and cooler temperatures through early next week in response to a broad mid/upper level trough along the West Coast.

AVIATION. as of 10:33 PM PDT Tuesday . For 06z TAFs. Skies will remain clear overnight through Weds. Light winds overnight with typical afternoon seabreeze winds to around 15 kt Weds afternoon.

Vicinity of KSFO . VFR with clear skies overnight into Weds. Evening westerly seabreeze gusts to 15-20 kt Weds afternoon.

SFO Bridge Approach . Clear skies with light onshore breezes.

Monterey Bay Terminals . VFR with clear skies overnight through Weds. Light winds, locally to around 15 kt Salinas Valley afternoon/early evening hours.

CLIMATE.

Record highs May 26 May 27 ----------------------------------------------------------------- Santa Rosa 96/1974 94/1984 Kentfield 99/1951 99/1919 Napa 98/1896 102/1984 Richmond 87/1996 98/1984 San Francisco DT 91/1896 85/1933 SFO Airport 89/1974 97/1984 Redwood City 98/1974 98/1984 Half Moon Bay 78/1951 72/1982 Oakland DT 94/1974 100/1984 San Jose 95/1951 101/1984 Gilroy 98/1979 101/1974 Santa Cruz 94/1896 93/1984 Salinas 94/1974 84/2003 King City 104/1974 104/1984

MARINE. as of 9:00 PM PDT Tuesday . Breezy northwest winds will persist over the northern waters through Wednesday. These winds will generate steep fresh swell resulting in hazardous seas conditions for small crafts. Generally light to moderate northwest winds are expected elsewhere with winds generally easing across the waters late this week as an upper ridge sits over California and an upper low slowly approaches from the southwest. Mixed seas will continue with a short period northwest swell and a longer period southwest swell. A longer period northwest swell will arrive later this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Heat Advisory . CAZ506-507-510>513-516>518-528 SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 AM



PUBLIC FORECAST: Blier AVIATION: RWW MARINE: RWW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 21 mi50 min W 2.9 G 5.1 71°F 1010.6 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi50 min SSE 5.1 G 8 66°F 65°F1010.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi34 min Calm 65°F 1011 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi50 min SSW 8 G 11 63°F 1011.7 hPa
UPBC1 28 mi50 min WNW 8.9 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi50 min WNW 7 G 8 78°F 69°F1010.5 hPa
FTPC1 - 9414290 - San Francisco, CA 29 mi50 min W 1.9 G 7 61°F
46237 - San Francisco Bar, CA (142) 30 mi50 min 59°F5 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi95 min W 6
PXSC1 31 mi50 min 66°F 56°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi50 min Calm G 1 66°F 1010.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi50 min N 2.9 G 2.9
PCOC1 - 9415144 - Port Chicago, CA 32 mi50 min SW 5.1 G 8 83°F 71°F1010.1 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi50 min NW 4.1 G 5.1 64°F 1011.4 hPa
OBXC1 32 mi50 min 65°F 60°F
LNDC1 34 mi50 min NNW 1.9 G 2.9 69°F 1011.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi30 min NW 9.7 G 14 55°F 53°F7 ft1012 hPa52°F
AAMC1 - 9414750 - Alameda, CA 35 mi50 min WNW 2.9 G 2.9 69°F 67°F1011.4 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi30 min NW 19 G 23 53°F 50°F7 ft1011.8 hPa50°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi50 min NW 5.1 G 8 80°F 1009.7 hPa

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi25 minN 05.00 miFog/Mist61°F57°F88%1011.5 hPa
Novato / Gnoss Field, CA6 mi45 minNNW 410.00 miFair64°F57°F78%1011.2 hPa
Napa, Napa County Airport, CA17 mi26 minS 510.00 miFair68°F59°F73%1010 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi27 minSSE 310.00 miFair67°F59°F76%1010.3 hPa

Link to 5 minute data for KO69

Wind History from O69 (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmW3Calm3NW45W75
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm4NW6
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm4NW55
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3NW5N5NW4Calm

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Wed -- 12:18 AM PDT     Moonset
Wed -- 04:44 AM PDT     6.32 feet High Tide
Wed -- 05:50 AM PDT     Sunrise
Wed -- 10:11 AM PDT     Moonrise
Wed -- 12:47 PM PDT     -0.65 feet Low Tide
Wed -- 07:37 PM PDT     5.19 feet High Tide
Wed -- 08:25 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.6345.16.16.365.24.12.61.30.2-0.5-0.6-0.10.92.13.44.45.15.24.74.13.3

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Wed -- 12:17 AM PDT     Moonset
Wed -- 01:09 AM PDT     0.58 knots Max Flood
Wed -- 04:09 AM PDT     -0.00 knots Slack
Wed -- 05:50 AM PDT     Sunrise
Wed -- 07:38 AM PDT     -0.99 knots Max Ebb
Wed -- 10:10 AM PDT     Moonrise
Wed -- 12:08 PM PDT     0.00 knots Slack
Wed -- 03:07 PM PDT     0.58 knots Max Flood
Wed -- 07:19 PM PDT     -0.00 knots Slack
Wed -- 08:23 PM PDT     Sunset
Wed -- 09:22 PM PDT     -0.28 knots Max Ebb
Wed -- 11:48 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.60.50.30-0.3-0.7-0.9-1-0.9-0.6-0.4-0.10.30.50.60.60.50.30.1-0.2-0.3-0.3-0.2

Weather Map
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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

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Wind Forecast for San Francisco/Monterey Bay Area, CA (3,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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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.