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Marine Weather and Tides
Version 3.4 |
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues. 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. |
| Sunrise 6:18AM | Sunset 7:56PM | Wednesday April 25, 2018 11:10 AM PDT (18:10 UTC) | Moonrise 2:36PM | Moonset 3:12AM | Illumination 79% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ531 San Francisco Bay South Of The Bay Bridge- 845 Am Pdt Wed Apr 25 2018 Today..NW winds 5 kt...becoming W 5 to 15 kt in the afternoon. Tonight..W winds 5 to 15 kt. Thu..W winds 5 to 15 kt. Thu night..W winds 5 to 15 kt. Fri..W winds 5 to 15 kt. Sat..W winds 5 to 15 kt. Sun..W winds 5 to 15 kt. | PZZ500 845 Am Pdt Wed Apr 25 2018 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate west to northwest winds will continue through the week. Light to moderate seas will also persist through the forecast period with a mixed south and northwest swell developing late in the week. |
7 Day Forecast for Marine Location Near Brisbane, CA
Hourly EDIT Helplocation: 37.67, -122.38 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 251737 afdmtr area forecast discussion national weather service san francisco bay area 1037 am pdt Wed apr 25 2018 Synopsis A cooling trend is forecast to persist through late week and into the upcoming weekend as an upper level trough approaches from the pacific. This system may produce a few showers over the north bay late Friday into Saturday as it pushes inland north of our region, yet widespread rainfall is unlikely. Discussion As of 3:00 am pdt Wednesday... Onshore flow is directly east-west as the sfo-sac gradient is 2 mb and the sfo-acv gradient is neutral. This gives the marine air the maximum effect over the district. With the marine layer holding around 1500 feet night and morning low clouds can be expected around much of the mry and sfo bay area while temperatures will remain as cool as yesterday. An upper low centered 750 miles west of point arena will drift slowly ene. As it gets closer the marine layer will deepen even more Thursday through Saturday bringing cool marine air into the interior valleys. Models showing night and morning low clouds spreading into places like livermore and concord Thursday night. Eventually the marine layer will mix out but the airmass will be colder so temperatures will continue below normal. By Saturday highs around the entire CWA will range from the upper 50s at the coast to the lower 70s in the far interior. Models continue to show the upper low moving into northern california on Saturday. Precipitation chances appear to be very slim and confined to widely scattered showers in the north bay. Medium range models now show a slow warming trend for the beginning and middle of next week as the low moves further inland. Temperatures should return to near their normal values by about Wednesday. Aviation As of 10:37 am pdt Wednesday for 18z tafs. Low |
ceilings impacted all TAF terminals this morning with widespread lifr ifr MVFR conditions. Visible satellite shows the gradual eroding mixing-out of the stratus as of the 18z TAF publication and think most terminals will transition toVFR conditions in the next hour or so. The fort ord profiler indicates the marine layer as gradually increased over the past 12 hours from about 1,500 ft to 2,000 ft deep, likely in response to the approaching upper level low. More of the same is expected this tonight with low clouds again for Thursday morning. Vicinity of ksfo... Transitioning from MVFR toVFR conditions at the TAF publication time as this morning's stratus mixes out. West to northwest winds are expected this afternoon around 15 kt. The main concern turns to what is going to happen this evening overnight with the stratus return. At this point think we'll see bkn conditions return sometime after 6-7z Thursday, or several hours earlier than this morning. Will continue to monitor and update the TAF accordingly. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... MVFR ifr conditions at kmry until late morning as stratus lingers over the terminal. There is a non-zero chance we could see the low clouds persist into the afternoon, but confidence is too low to adjust the TAF as so. Expect low clouds to return sometime in the late afternoon evening hours with overcast conditions again for tomorrow morning. Marine As of 10:21 am pdt Wednesday... Generally light to locally moderate west to northwest winds will continue through the week. Light to moderate seas will also persist through the forecast period with a mixed south and northwest swell developing late in the week. Mtr watches warnings advisories Tday None. Public forecast: W pi aviation: rowe marine: rowe visit us at |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for Alameda, CA
(wind in knots) EDIT (on/off) Help| 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 | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | |
| Last 24hr | W | W G8 | W | W G11 | W | W | W G11 | W G13 | W | W G10 | W G9 | W | W | W | W | W G9 | W | W | W G8 | W G9 | W G6 | NW G6 | SW G7 | W |
| 1 day ago | W | W | W | W | W | W G13 | W | W | W | W | W G7 | W G11 | W | W G10 | W G9 | W | W G7 | W | W | S | W G4 | W | SW G9 | W G7 |
| 2 days ago | W | W | NW G8 | W | W | W | W G13 | W G14 | W G8 | N G6 | W | W | W | W | W | W | W | W | W | N | W | W | S | W |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| San Francisco, San Francisco International Airport, CA | 4 mi | 74 min | SSE 4 | 9.00 mi | Overcast | 58°F | 48°F | 70% | 1018.6 hPa |
| Oakland, Metro Oakland International Airport, CA | 9 mi | 77 min | NW 4 | 10.00 mi | Overcast | 54°F | 48°F | 80% | 1018.8 hPa |
| San Carlos Airport, CA | 12 mi | 83 min | Var 4 | 8.00 mi | Overcast | 55°F | 50°F | 82% | 1018.6 hPa |
| Half Moon Bay Airport, CA | 13 mi | 70 min | SW 4 | 8.00 mi | Overcast | 52°F | 46°F | 82% | 1019.3 hPa |
| Hayward, Hayward Air Terminal, CA | 14 mi | 76 min | NNW 5 | 10.00 mi | Overcast | 56°F | 46°F | 70% | 1019.6 hPa |
| Palo Alto Airport, CA | 19 mi | 83 min | Var 5 | 10.00 mi | Mostly Cloudy | 0°F | 0°F | % | 1018.6 hPa |
| Mountain View, Moffett Field, CA | 24 mi | 74 min | NNW 4 | 9.00 mi | Mostly Cloudy | 59°F | 51°F | 75% | 1018.8 hPa |
Wind History from SFO (wind in knots)
| 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 | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | |
| Last 24hr | NW | NW | W | W | W | W | W | W | NW | W | W | W | W | W | W | W | Calm | SW | W | W | S | W | SE | NW |
| 1 day ago | NE | N | NW | W | W | W | W | W | W | W | NW | W | W | NW | NW | W | W | S | SW | W | W | W | NW | NW |
| 2 days ago | NE | NW | W | NW | W | W | W | W | NW | NW | NW | W | W | W | W | W | W | W | W | W | SW | Calm | N | E |
Tide / Current Tables for Oyster Point Marina, San Francisco Bay, California
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Oyster Point Marina Click for Map Wed -- 03:44 AM PDT 1.62 feet Low Tide Wed -- 04:11 AM PDT Moonset Wed -- 06:21 AM PDT Sunrise Wed -- 09:32 AM PDT 6.16 feet High Tide Wed -- 03:36 PM PDT Moonrise Wed -- 04:02 PM PDT -0.13 feet Low Tide Wed -- 07:54 PM PDT Sunset Wed -- 10:40 PM PDT 6.97 feet High 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 |
| 5.1 | 3.8 | 2.6 | 1.8 | 1.6 | 2.2 | 3.2 | 4.3 | 5.4 | 6.1 | 6.1 | 5.4 | 4.1 | 2.6 | 1.2 | 0.3 | -0.1 | 0.2 | 1.2 | 2.7 | 4.3 | 5.8 | 6.8 | 6.9 |
Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
EDIT (on/off) Help One Week of Data| Sierra Point 1.3 mi ENE Click for Map Wed -- 01:00 AM PDT -0.85 knots Max Ebb Wed -- 03:56 AM PDT 0.01 knots Slack Wed -- 04:11 AM PDT Moonset Wed -- 06:20 AM PDT Sunrise Wed -- 06:57 AM PDT 0.82 knots Max Flood Wed -- 09:44 AM PDT -0.00 knots Slack Wed -- 01:04 PM PDT -1.17 knots Max Ebb Wed -- 03:36 PM PDT Moonrise Wed -- 04:16 PM PDT 0.01 knots Slack Wed -- 07:35 PM PDT 1.14 knots Max Flood Wed -- 07:54 PM PDT Sunset Wed -- 10:40 PM PDT -0.01 knots Slack 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 |
| -0.8 | -0.9 | -0.8 | -0.5 | 0 | 0.5 | 0.7 | 0.8 | 0.7 | 0.4 | -0.1 | -0.7 | -1 | -1.2 | -1.1 | -0.8 | -0.2 | 0.4 | 0.9 | 1.1 | 1.1 | 0.9 | 0.4 | -0.2 |
Weather Map and Satellite Images
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GOES 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 (14,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, 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. |