Tuesday, January28, 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 7:17AMSunset 5:29PM Tuesday January 28, 2020 7:49 AM PST (15:49 UTC) Moonrise 9:42AMMoonset 9:15PM Illumination 13% Phase: Waxing Crescent; Moon at 4 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- 257 Am Pst Tue Jan 28 2020
Today..SW winds 5 to 15 kt. A chance of rain.
Tonight..NW winds 5 to 15 kt.
Wed..NW winds up to 10 kt.
Wed night..W winds 5 to 15 kt.
Thu..W winds up to 10 kt.
Thu night..W winds up to 10 kt.
Fri..N winds around 5 kt.
Sat..N winds around 5 kt.
PZZ500 257 Am Pst Tue Jan 28 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak cool front moving across the coastal waters this morning will give way to increasing winds from the north and building short period seas. Conditions will remain elevated through the work week. A long 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 281228 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 428 AM PST Tue Jan 28 2020

SYNOPSIS. Light rain will be possible over the North Bay and as far south as San Francisco through early afternoon. Dry conditions are then forecast region-wide through the remainder of the week along with a gradual warming trend. Cooling is then forecast by Sunday and into early next week.

DISCUSSION. as of 02:58 AM PST Tuesday . A mid/upper level system approaching the Pacific Northwest has pushed a frontal boundary into Northern California early this morning. Ahead of the boundary, high level clouds continue to advect inland while low level moisture in the boundary layer has also resulted in low clouds over much of the region. This cloud cover has kept temperatures generally in the upper 40s to lower 50s so far this morning.

Light rain associated with the front is being detected by regional radar over Northern California and as far south as Mendocino County. This will continue to advance inland and southward through the morning with light precipitation likely to develop over the North Bay around sunrise and then continue through mid-morning. Light rain may push as far south as San Francisco and the San Mateo coastline before dissipating by early afternoon. Thus, most areas to the south of the aforementioned areas will remain dry today. Areas that do receive rainfall will generally see amounts of one-tenth of an inch or less.

A warming trend will occur through the remainder of the week as high pressure over the eastern Pacific builds inland. With 850 mb temperatures forecast to approach 15 deg C by Friday and Saturday, look for daytime temperatures to be 5 to 10 degrees above seasonal averages. Widespread middle/upper 60s are likely with lower 70s across the interior. Cannot even rule out maximum temperatures reaching into the middle 70s by Sunday afternoon under mainly clear sky conditions.

Temperatures cool region-wide by Sunday and into early next week as the ridge is replaced by a broad mid/upper level trough. However, precipitation will likely remain to the north and east of the region. Longer range outlooks maintain dry weather conditions over much of the region through early February.

AVIATION. as of 4:28 AM PST Tuesday . For 12Z TAFs . A weak frontal boundary will move over the Bay Area and Monterey Bay regions through the day today. This will bring some light rain to many of the terminals in the Bay Area proper and maybe some brief light rain in Monterey. Winds around the front are not forecast to be of any significance either. Behind the front, when the winds shift to come out of the northwest, there may be a brief period when the winds pick up to 10 knots or so, but otherwise they are forecast to remain weak. Tonight into Wednesday morning will be the difficult part. High pressure building across the area in the wake of the front will help to trap some of the low level moisture in the area which could yield some low cigs and vsby issues at some terminals tonight. The TAFs continue to hint at this possibility with STS being the near sure bet of low cigs and vsby tonight.

Vicinity of KSFO . MVFR is starting the morning at SFO and is expected to continue through much of the day as a weak frontal boundary limps through the area. In the wake of the front, residual moisture and building high pressure may cause overnight lowering cigs and vsby. Something that will need to be watched for development. Think of summer type conditions.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Some passing low cigs in the area this morning are forecast to mix out as a weakening frontal boundary approaches. As the front limps over the area more low cigs are likely. High pressure will build in the wake of the dissipating front, which will cause possible reduction in vsby at Monterey terminal tonight. This will need watching.

MARINE. as of 04:11 AM PST Tuesday . A weak cool front moving across the coastal waters this morning will give way to increasing winds from the north and building short period seas. Conditions will remain elevated through the work week. A Long period northwest swell will arrive later this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: RGass AVIATION: BFG/Canepa MARINE: BFG

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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 SW 2.9 G 4.1 53°F 1027 hPa (-0.6)
RCMC1 - 9414863 - Richmond, CA 23 mi50 min 54°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi33 min SE 5.1 52°F 1028 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi50 min SSE 8.9 G 13 54°F 1027.8 hPa (-0.6)
PRYC1 - 9415020 - Point Reyes, CA 25 mi50 min 54°F1026.9 hPa (-0.5)
UPBC1 28 mi50 min SSW 4.1 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi50 min SSW 2.9 G 5.1 53°F 52°F1027.4 hPa (-0.5)
FTPC1 - 9414290 - San Francisco, CA 29 mi56 min S 2.9 G 5.1 53°F 54°F1027.3 hPa
46237 - San Francisco Bar, CA (142) 30 mi50 min 54°F7 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi65 min S 4.1
PXSC1 31 mi50 min 54°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi50 min SE 8.9 G 11 53°F 1026.4 hPa (-0.7)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi50 min SSE 7 G 8.9
PCOC1 - 9415144 - Port Chicago, CA 32 mi50 min S 4.1 G 6 52°F 51°F1027 hPa (-0.6)
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi50 min SSE 6 G 8.9 52°F 1027.5 hPa (-0.7)
OBXC1 32 mi50 min 53°F 53°F
LNDC1 34 mi50 min SE 4.1 G 6 53°F 1027.4 hPa (-0.8)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi20 min S 9.7 G 14 54°F 54°F1028 hPa
AAMC1 - 9414750 - Alameda, CA 35 mi50 min 54°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi30 min SSW 9.7 G 12 55°F1027.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi50 min Calm G 1.9 54°F 1027.2 hPa (-0.4)

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi75 minE 39.00 miOvercast52°F51°F100%1027.4 hPa
Novato / Gnoss Field, CA6 mi75 minN 010.00 miMostly Cloudy50°F50°F100%1027.4 hPa
Napa, Napa County Airport, CA17 mi56 minS 510.00 miOvercast52°F50°F93%1026.3 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi57 minS 34.00 miFog/Mist52°F52°F100%1026.1 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmNW3CalmCalmNW8NW4W6
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1 day agoSW14
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2 days agoS4CalmCalmS3SE4CalmCalmCalmCalmCalmSW6S5Calm4CalmCalmCalmCalmW10SW43SW7SW6Calm

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Tue -- 04:29 AM PST     5.84 feet High Tide
Tue -- 07:18 AM PST     Sunrise
Tue -- 09:41 AM PST     Moonrise
Tue -- 10:38 AM PST     2.15 feet Low Tide
Tue -- 03:24 PM PST     6.13 feet High Tide
Tue -- 05:28 PM PST     Sunset
Tue -- 09:15 PM PST     Moonset
Tue -- 10:55 PM PST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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12.43.855.85.85.34.53.52.72.22.22.945.366.15.64.73.52.21.20.50.3

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Tue -- 12:20 AM PST     0.62 knots Max Flood
Tue -- 04:08 AM PST     -0.00 knots Slack
Tue -- 06:38 AM PST     -0.43 knots Max Ebb
Tue -- 07:17 AM PST     Sunrise
Tue -- 09:25 AM PST     0.00 knots Slack
Tue -- 09:40 AM PST     Moonrise
Tue -- 11:42 AM PST     0.53 knots Max Flood
Tue -- 02:55 PM PST     -0.00 knots Slack
Tue -- 05:27 PM PST     Sunset
Tue -- 06:11 PM PST     -0.83 knots Max Ebb
Tue -- 09:14 PM PST     Moonset
Tue -- 10:05 PM PST     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.60.50.30-0.2-0.4-0.4-0.3-0.10.20.50.50.40.2-0-0.4-0.7-0.8-0.8-0.6-0.4-00.4

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.
Link to Loop

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Wind Forecast for San Francisco/Monterey Bay Area, CA (10,2,3,4)
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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.