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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 6:30AM | Sunset 7:55PM | Monday August 21, 2017 6:43 PM PDT (01:43 UTC) | Moonrise 5:22AM | Moonset 7:07PM | Illumination 0% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 202 Pm Pdt Mon Aug 21 2017 .small craft advisory in effect until 9 pm pdt this evening... Tonight..W winds 10 to 20 kt. Tue..SW winds 10 to 20 kt. Tue night..SW winds 10 to 20 kt. Wed..SW winds 5 to 15 kt. Wed night..SW winds 10 to 20 kt. Thu..SW winds 5 to 15 kt. Fri..SW winds 10 kt. Sat..SW winds 10 kt. | PZZ500 202 Pm Pdt Mon Aug 21 2017 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Weak low pressure over the coastal waters will continue to yield light to moderate winds through midweek. High pressure will develop for the second half of the week and cause the coastal pressure gradient to tighten. This is forecast to bring strong to near gale northerly winds and associated large steep seas. No long period swell is expected for the next 7 days. |
7 Day Forecast for Marine Location Near Novato, CA
Hourly EDIT Helplocation: 38.1, -122.59 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 220036 afdmtr area forecast discussion national weather service san francisco bay area 536 pm pdt Mon aug 21 2017 Synopsis Cooler than average temperatures, especially inland, will persist through midweek with low clouds in the overnight and early morning near the coast and in the valleys. An inland warming trend is then likely late in the week and into the upcoming weekend as high pressure builds back over the region. Discussion As of 01:55 pm pdt Monday... Temperatures are running up to 6 degrees cooler compared to 24 hours ago as low clouds persist over the region. This is a result of the deep marine layer holding on strong at more than 2,000 feet in depth. While low clouds are finally clearing inland and from the south off of the big sur coast, do expect a return of stratus again overnight as a mid upper level low sits off of the southern california coast. Overall, this will bring about temperatures that are generally below seasonal averages through midweek. By midweek and into the upcoming weekend high pressure centered over the four corners region will begin to build toward the california coast. This will result in a warming trend, especially for inland areas, with temperatures rebounding back to or slightly above seasonal averages. Look for more widespread 80s and 90s inland during the afternoon hours under mostly sunny skies. This building ridge will likely compress the marine layer as well with less inland penetration of stratus late in the forecast period. Meanwhile, coastal areas will likely remain in the 60s to 70s as onshore flow persists. Aviation As of 5:05 pm pdt Monday... For 00z tafs. Clearing continues at the hour with ksts just having cleared over the north bay. CIGS are anticipated to return early this evening under a deep 2200 ft marine layer and moderate onshore flow. Also of note |
is a line of clouds moving in from the east. Radar depicts a few showers associated with these clouds however they are quickly dissipating and not anticipated to bring showers to any terminals at this time. Winds will remain light to moderate through this evening then will gradually dissipate overnight. Vicinity of ksfo...VFR conditions will prevail through early evening then return around 04z tonight. BorderlineVFR MVFR cigs expected through tonight with clearing anticipated around 18z Tuesday morning. Light to moderate west winds will prevail. Sfo bridge approach... Similar to ksfo. Monterey bay terminals...VFR conditions will prevail through late this afternoon with low clouds anticipated to return around 02z-03z tonight.VFR CIGS expected through tonight with clearing anticipated around 19z Tuesday morning. Moderate west winds will ease overnight becoming light. MVFR ifr through through early afternoon. There is a distinct chance that mry never breaks today. Sns should see a bit of clearing by afternoon, but clouds will remain around the area and come back early this evening. Marine As of 05:16 pm pdt Monday... Weak low pressure over the coastal waters will continue to yield light to moderate winds through midweek. High pressure will develop for the second half of the week and cause the coastal pressure gradient to tighten. This is forecast to bring strong to near gale northerly winds and associated large steep seas. No long period swell is expected for the next 7 days. Mtr watches warnings advisories Tngt Sca... Sf bay until 9 pm public forecast: rgass aviation: cw marine: bam visit us at |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for Richmond, CA
(wind in knots) EDIT (on/off) Help| 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 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 | |
| Last 24hr | W G8 | N G7 | S G6 | NW | W G9 | NW G10 | NW G8 | SW G8 | W G9 | W G7 | NW G10 | W | SW G9 | SW G10 | SW G9 | SW G11 | S G11 | S G12 | S G10 | W G8 | SW G9 | S G13 | SW G11 | S G14 |
| 1 day ago | S G12 | SW G13 | SW G13 | SW G8 | S | SW G9 | SW G15 | SW G13 | SW G16 | SW G14 | SW G14 | SW G15 | S | SW G12 | SW G10 | W G6 | W G7 | W G8 | W G9 | W G10 | E G6 | S G10 | S G9 | S G8 |
| 2 days ago | SW G7 | NW G6 | S | S G10 | SW G10 | SW G6 | SW G8 | SW G7 | SW G8 | SW G11 | W | SW | S G10 | S G10 | SW G7 | SW | SW G10 | S G10 | S G11 | S | SW G11 | SW G14 | SW G12 | S G12 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Novato / Gnoss Field, CA | 4 mi | 69 min | WSW 10 | 10.00 mi | Fair | 72°F | 57°F | 61% | 1015.9 hPa |
| Petaluma Municipal Airport, CA | 11 mi | 49 min | WNW 7 G 13 | 10.00 mi | Fair | 70°F | 59°F | 69% | 1016.3 hPa |
| Napa, Napa County Airport, CA | 18 mi | 50 min | SSW 15 | 10.00 mi | Fair | 71°F | 59°F | 66% | 1014.4 hPa |
Wind History from DVO (wind in knots)
| 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | -12 PM | 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 | |
| Last 24hr | G10 | Calm | SW | NW | W | Calm | Calm | N | G11 | Calm | W | SW | SW | SW | W | W | SW | SW G11 | SW G15 | SW | W G17 | W | SW | |
| 1 day ago | N | N | N | Calm | Calm | Calm | Calm | Calm | Calm | N | N | N | NE | Calm | N | N | G10 | Calm | W G14 | NW | NW | NW | NW | |
| 2 days ago | N | N | N | NW | Calm | N | NW | NW | N | N | N | N | N | Calm | Calm | N | N | N | N | W G25 | N G16 | N G23 | G11 |
Tide / Current Tables for Hog Island, San Antonio Creek, San Pablo Bay, California
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Hog Island Click for Map Mon -- 12:59 AM PDT 7.26 feet High Tide Mon -- 06:21 AM PDT Moonrise Mon -- 06:30 AM PDT Sunrise Mon -- 08:21 AM PDT -0.55 feet Low Tide Mon -- 11:31 AM PDT New Moon Mon -- 02:31 PM PDT 5.97 feet High Tide Mon -- 07:55 PM PDT Sunset Mon -- 08:06 PM PDT Moonset Mon -- 08:24 PM PDT 1.45 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 6.7 | 7.3 | 6.9 | 6 | 4.5 | 2.8 | 1.2 | 0 | -0.5 | -0.4 | 0.5 | 1.9 | 3.5 | 4.9 | 5.8 | 5.9 | 5.3 | 4.2 | 3 | 2 | 1.5 | 1.6 | 2.6 | 4 |
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 Mon -- 12:44 AM PDT -0.00 knots Slack Mon -- 04:22 AM PDT -0.94 knots Max Ebb Mon -- 06:21 AM PDT Moonrise Mon -- 06:30 AM PDT Sunrise Mon -- 08:08 AM PDT 0.00 knots Slack Mon -- 11:04 AM PDT 0.65 knots Max Flood Mon -- 11:31 AM PDT New Moon Mon -- 02:27 PM PDT -0.00 knots Slack Mon -- 05:08 PM PDT -0.54 knots Max Ebb Mon -- 07:40 PM PDT 0.00 knots Slack Mon -- 07:54 PM PDT Sunset Mon -- 08:05 PM PDT Moonset Mon -- 10:10 PM PDT 0.72 knots Max Flood Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 0.3 | -0.1 | -0.5 | -0.8 | -0.9 | -0.9 | -0.8 | -0.5 | -0.1 | 0.3 | 0.6 | 0.6 | 0.6 | 0.4 | 0.1 | -0.2 | -0.4 | -0.5 | -0.5 | -0.2 | 0.1 | 0.5 | 0.7 | 0.7 |
Weather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of CentralWestCoast EDIT  |
Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
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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. |