Saturday, March28, 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 6:58AMSunset 7:31PM Saturday March 28, 2020 10:13 AM PDT (17:13 UTC) Moonrise 8:27AMMoonset 10:45PM Illumination 21% 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- 801 Am Pdt Sat Mar 28 2020
Today..SW winds around 5 kt, increasing to 5 to 15 kt this afternoon. Rain.
Tonight..SW winds 5 to 10 kt. Rain.
Sun..S winds 5 to 15 kt. Rain.
Sun night..W winds 5 to 15 kt.
Mon..W winds 5 to 10 kt.
Mon night..W winds 5 to 10 kt.
Tue..NW winds 5 to 10 kt.
Wed..NW winds up to 10 kt.
PZZ500 801 Am Pdt Sat Mar 28 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will shift into the southern california waters as a low pressure system moves into waters off the coast of the pacific northwest. This will keep winds generally light through the weekend and into early next week. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.


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 281554 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 854 AM PDT Sat Mar 28 2020

SYNOPSIS. Light rain showers on and off today for the Bay Area under cloudy skies. There may be a brief lull in showers tonight before the cold front arrives with another round of organized, mainly light rainfall Sunday morning into Sunday afternoon. Skies turn partly cloudy and showers end by Sunday evening. High pressure builds next week with a warming and drying trend.

DISCUSSION. as of 8:54 AM PDT Saturday . Radar continues to show widespread light rain across the region with most Bay Area locations reporting some light rain so far this morning. The system is weak and disorganized and we are currently in the warm advection region which is driving ascent and leading to the precip. There may be a brief lull in precip later this afternoon and evening but still need to hold onto light rain chances through tonight. Sunday morning the surface cold front and trough of cold air aloft will pass through the region. This will lead to a more organized period of rainfall for Sunday morning into early Sunday afternoon as the front moves through. Rain totals 0.25-0.50 on average with 0.10-0.25 for the interior valleys by Sunday evening.

The front is out of the region with dry conditions Sunday night. One fly in the ointment we'll have to monitor is the last few model runs of the NAM bring another shot of light rain to the North Bay on Monday. Will fine tune forecast on those details for this afternoon but high confidence for dry weather south of the Golden Gate on Monday with any North Bay rain on Monday being very light.

Increasing confidence that a prolong period of dry weather returns for the first week of April though longer range trends suggest more precip is possible beyond day 10.

AVIATION. as of 4:51 AM PDT Saturday . Radar is picking up precip just west of the Bay Area. Cigs dropping to near MVFR conditions with light rain by 15Z. Models forecast low-level moisture through early tonight so will see MVFR cigs continuing through the day. A brief break after 04Z before a secondary front arrives Sunday morning bringing rain and lower cigs back. Winds will switch to a south to southeast direction this morning with speeds under 10 kt. A switch to the west is expected in the afternoon.

Vicinity of KSFO . Light rain after 14-15Z with cigs becoming MVFR. Bases lowering to 2500 ft after 15Z then lowering further to 1500 ft after 20Z. Southeast winds under 10 kt becoming westerly to 10 kt in the afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Becoming MVFR after 15Z with light showers after 18Z. Southerly winds 5-10 kt in the morning becoming west in the afternoon.

MARINE. as of 08:20 AM PDT Saturday . High pressure will shift into the southern California waters as a low pressure system moves into waters off the coast of the Pacific Northwest. This will keep winds generally light through the weekend and into early next week. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: RWW AVIATION: AS MARINE: AS

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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 mi55 min NW 1.9 G 2.9 51°F 1023.3 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi55 min SE 2.9 G 5.1 52°F 56°F1023.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi45 min ESE 4.1 51°F 1024 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi55 min ESE 7 G 8.9 52°F 1023.8 hPa
UPBC1 28 mi55 min W 2.9 G 6
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi55 min W 4.1 G 5.1 51°F 57°F1023.5 hPa
FTPC1 - 9414290 - San Francisco, CA 29 mi55 min 58°F
46237 - San Francisco Bar, CA (142) 30 mi43 min 55°F3 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi88 min WNW 1.9
PXSC1 31 mi55 min 53°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi55 min E 5.1 G 8 52°F 1022.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi61 min ESE 6 G 8.9
PCOC1 - 9415144 - Port Chicago, CA 32 mi55 min S 5.1 G 8 50°F 57°F1023.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi55 min ESE 6 G 8 51°F 1023.6 hPa
OBXC1 32 mi55 min 52°F 52°F
LNDC1 34 mi55 min ESE 4.1 G 7 51°F 1023.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi33 min ESE 1.9 G 3.9 52°F 55°F1024.2 hPa
AAMC1 - 9414750 - Alameda, CA 35 mi55 min ESE 7 G 9.9 51°F 57°F1023.6 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi43 min ENE 1.9 G 3.9 54°F1023.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi61 min WNW 2.9 G 5.1 52°F 1023.3 hPa

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi18 minN 04.00 miFog/Mist50°F50°F100%1023.7 hPa
Novato / Gnoss Field, CA6 mi38 minN 04.00 miFog/Mist50°F50°F100%1023.7 hPa
Napa, Napa County Airport, CA17 mi19 minN 08.00 miOvercast50°F46°F86%1022.6 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi20 minN 06.00 miLight Rain Fog/Mist49°F46°F90%1022.9 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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SW16SW1146N4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalm4Calm44NW11W14W10
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W12CalmE6NE6S6S53E3CalmN4CalmCalmCalmCalmN4
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Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Sat -- 04:29 AM PDT     6.19 feet High Tide
Sat -- 07:00 AM PDT     Sunrise
Sat -- 09:27 AM PDT     Moonrise
Sat -- 11:55 AM PDT     0.43 feet Low Tide
Sat -- 05:45 PM PDT     4.77 feet High Tide
Sat -- 07:30 PM PDT     Sunset
Sat -- 11:42 PM PDT     1.90 feet Low Tide
Sat -- 11:45 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.84.15.36.16.15.74.83.62.31.30.60.40.91.82.93.94.64.84.53.93.12.42

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Sat -- 12:30 AM PDT     0.69 knots Max Flood
Sat -- 03:51 AM PDT     -0.00 knots Slack
Sat -- 06:56 AM PDT     -0.81 knots Max Ebb
Sat -- 06:59 AM PDT     Sunrise
Sat -- 09:26 AM PDT     Moonrise
Sat -- 11:16 AM PDT     0.00 knots Slack
Sat -- 01:36 PM PDT     0.46 knots Max Flood
Sat -- 05:27 PM PDT     -0.00 knots Slack
Sat -- 07:29 PM PDT     Sunset
Sat -- 07:40 PM PDT     -0.40 knots Max Ebb
Sat -- 10:32 PM PDT     0.00 knots Slack
Sat -- 11:44 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.50.3-0.1-0.4-0.7-0.8-0.7-0.6-0.4-0.10.20.40.50.40.30.1-0.2-0.4-0.4-0.3-0.10.1

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

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)
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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.