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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 7:00AM | Sunset 6:59PM | Tuesday September 26, 2017 7:23 AM PDT (14:23 UTC) | Moonrise 12:04PM | Moonset 10:21PM | Illumination 34% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ531 San Francisco Bay South Of The Bay Bridge- 251 Am Pdt Tue Sep 26 2017 Today..NW winds 5 to 15 kt. Tonight..NW winds 5 to 15 kt. Wed..NW winds 10 kt. Wed night..NW winds 5 to 15 kt. Thu..W winds 5 to 15 kt. Fri..W winds 10 kt. Sat..NW winds 5 to 15 kt. | PZZ500 251 Am Pdt Tue Sep 26 2017 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A thermal trough over the california interior will shift to the coast resulting in decreasing winds. An upper level trough will approach the pacific northwest Friday increasing the pressure gradients over the area. |
7 Day Forecast for Marine Location Near Belmont, CA
Hourly EDIT Helplocation: 37.52, -122.28 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 261143 afdmtr area forecast discussion national weather service san francisco bay area 443 am pdt Tue sep 26 2017 Synopsis Breezy in the hills this morning then turning sunny and warm to hot again by midday. Another shot of gusty winds again this evening for the north and east bay hills. Continued warm and dry on Wednesday which may be the hottest day this week but with winds easing. Onshore flow gradually returns by Thursday with a few degrees of cooling followed by more noted cooling Friday and Saturday as a trough passes to our north. Dry high pressure rebuilds Sunday into next week. Discussion As of 3:37 am pdt Tuesday... Skies remain mostly clear this morning with mild overnight lows around 60 most areas. Surface gradients currently show a 6 mb pressure gradient down the coast form arcata to sfo which is a dry northerly flow. The large scale offshore from the deserts is around 7-8 mb which is only moderate. This is translating to some gusty winds in the north and east bay hills with hawkeye in northern sonoma currently gusting 28 mph with 19 mph on mt tamalpais. This all sets the stage for rapid warming again today as the Sun comes up and the dry airmass quickly warms up under adiabatic compression off the coastal hills. The official forecast for today has widespread 80s and 90s across the bay area. Models show another shot of east northeast winds in the hills this evening which will keep fire weather concerns in place due to poor humidity recovery, mild temps and continued dry offshore winds. Winds will finally ease on Wednesday but another warm to hot day is forecast across the region. Some coastal cooling should become obvious by Thursday as onshore flow gradually returns to area but inland areas will remain above normal once again. The ECMWF nows brings a dry cold front over the bay area by Friday. This should induce some gusty onshore winds and a possible return of the marine layer into Saturday. The pattern looks progressive with high pressure rebuilding by Sunday into early |
next week with another thermal trough setting up at the surface. This should translate too another round of sunny and mild days for early next week before the next trough knocks temps back down a few degrees. Aviation As of 4:45 am pdt Tuesday... Dry offshore winds supportVFR through Tuesday. Vicinity of ksfo...VFR. Sfo bridge approach... Similar to ksfo. Monterey bay terminals...VFR. Fire weather As of 3:37 am pdt Tuesday... Red flag warnings remain in place for the north and east bay hills into weds. Humidity remains below 30 percent early this morning with dry north winds showing up in the hills. Winds forecast to ease through the daytime hours today but another warm and dry day. Models show another shot of gusty east northeast winds by this evening and overnight, strongest in the napa hills. Latest fuels analysis shows that fuels are around normal in terms of seasonable dryness but of course this is the driest time of year. However trend of warmer and drier will continue to dry out the fine and live fuels. Winds will finally ease on Wednesday but that may be the hottest and driest day this week. Will need to watch for return of onshore winds Thursday afternoon for the interior valleys. Breezy onshore winds Friday and Saturday then warming and drying again Sunday into early next week. Marine As of 3:00 am pdt Tuesday... A thermal trough over the california interior will shift to the coast resulting in decreasing winds. An upper level trough will approach the pacific northwest Friday increasing the pressure gradients over the area. Mtr watches warnings advisories Tday Sca... Pt arena to pigeon pt 10-60 nm until 3 pm public forecast: rww aviation: W pi marine: W pi fire weather: rww visit us at |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for Redwood City, CA
(wind in knots) EDIT (on/off) Help| 8 AM | 9 AM | 10 AM | 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 | |
| Last 24hr | SE | -- | E | NW | NW | N | NW G6 | NW | NW | NW G13 | W | W G11 | N G9 | NW | S | SE | S | W | SW | S | SW | SE | SE | -- |
| 1 day ago | S | E | E | W | SW | NW | NW | N | NW | NW | W G15 | W | W G10 | NW | NW | SE | -- | SW | -- | W | SW | SE | NE | S |
| 2 days ago | SE | E | NW | W | NW G9 | NW G17 | NW G15 | NW | W | W | W | W G14 | W | NW | W | SE | SE | E | W | S | SW | E | S | -- |
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 Carlos Airport, CA | 2 mi | 29 min | N 0 | 10.00 mi | Fair | 59°F | 50°F | 72% | 1011.2 hPa |
| San Francisco, San Francisco International Airport, CA | 8 mi | 28 min | N 0 | 10.00 mi | Partly Cloudy | 61°F | 48°F | 65% | 1010.7 hPa |
| Half Moon Bay Airport, CA | 12 mi | 29 min | N 0 | 6.00 mi | Fair with Haze | 48°F | 0°F | % | 1009.8 hPa |
| Hayward, Hayward Air Terminal, CA | 13 mi | 30 min | ENE 5 | 10.00 mi | Fair | 59°F | 39°F | 48% | 1011.7 hPa |
| Oakland, Metro Oakland International Airport, CA | 13 mi | 31 min | ENE 3 | 10.00 mi | A Few Clouds | 55°F | 46°F | 74% | 1010.8 hPa |
| Mountain View, Moffett Field, CA | 14 mi | 28 min | N 0 | 10.00 mi | Fair | 59°F | 48°F | 69% | 1011.4 hPa |
| San Jose, San Jose International Airport, CA | 21 mi | 31 min | S 3 | 10.00 mi | A Few Clouds | 59°F | 43°F | 56% | 1010.8 hPa |
Wind History from SQL (wind in knots)
| 8 AM | 9 AM | 10 AM | 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 | |
| Last 24hr | Calm | Calm | Calm | Calm | Calm | Calm | W | NW | NW | W | W | NW | NW | Calm | S | Calm | Calm | Calm | Calm | Calm | Calm | S | Calm | |
| 1 day ago | Calm | Calm | E | Calm | N | NW | N | NW | NW | W G17 | W | W | W | NW | Calm | Calm | N | SW | Calm | NW | SW | Calm | Calm | |
| 2 days ago | Calm | Calm | N G16 | NW | NW G14 | NW G16 | W G19 | W | W | W | Calm | Calm | Calm | Calm | S | Calm | Calm | Calm | Calm | Calm | SW |
Tide / Current Tables for Smith Slough, San Francisco Bay, California
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Smith Slough Click for Map Tue -- 12:08 AM PDT 0.88 feet Low Tide Tue -- 06:32 AM PDT 6.30 feet High Tide Tue -- 07:00 AM PDT Sunrise Tue -- 12:15 PM PDT 2.89 feet Low Tide Tue -- 01:03 PM PDT Moonrise Tue -- 05:33 PM PDT 7.21 feet High Tide Tue -- 06:59 PM PDT Sunset Tue -- 11:21 PM PDT Moonset 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 |
| 0.9 | 1.2 | 2.1 | 3.3 | 4.6 | 5.6 | 6.2 | 6.2 | 5.8 | 4.9 | 4 | 3.3 | 2.9 | 3.1 | 3.8 | 5 | 6.2 | 7.1 | 7.2 | 6.7 | 5.7 | 4.5 | 3.2 | 2 |
Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
EDIT (on/off) Help One Week of Data| San Mateo Bridge Click for Map Tue -- 12:29 AM PDT 0.00 knots Slack Tue -- 03:13 AM PDT 1.26 knots Max Flood Tue -- 06:56 AM PDT -0.01 knots Slack Tue -- 07:00 AM PDT Sunrise Tue -- 09:28 AM PDT -0.77 knots Max Ebb Tue -- 12:32 PM PDT 0.00 knots Slack Tue -- 01:03 PM PDT Moonrise Tue -- 03:05 PM PDT 0.86 knots Max Flood Tue -- 06:13 PM PDT -0.00 knots Slack Tue -- 06:59 PM PDT Sunset Tue -- 09:46 PM PDT -1.32 knots Max Ebb Tue -- 11:21 PM PDT Moonset 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 | 0.4 | 1 | 1.2 | 1.2 | 1 | 0.5 | -0 | -0.5 | -0.7 | -0.7 | -0.5 | -0.2 | 0.2 | 0.6 | 0.9 | 0.8 | 0.5 | 0.1 | -0.3 | -0.8 | -1.2 | -1.3 | -1 |
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 (10,2,3,4)
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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. |