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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 6:26AM | Sunset 8:00PM | Thursday August 17, 2017 4:37 AM PDT (11:37 UTC) | Moonrise 1:07AM | Moonset 3:45PM | Illumination 23% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 253 Am Pdt Thu Aug 17 2017 .small craft advisory in effect from 1 pm pdt this afternoon through this evening... Today..SW winds 10 to 20 kt. Tonight..SW winds 10 to 20 kt. Fri..SW winds 10 to 20 kt. Fri night..SW winds 10 to 20 kt. Sat..SW winds 15 to 25 kt. Patchy fog after midnight. Sun..SW winds 5 to 15 kt. Mon..SW winds 5 kt...increasing to 5 to 15 kt. | PZZ500 253 Am Pdt Thu Aug 17 2017 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light variable winds through the day as an east pacific ridge builds inland to the north while a weak trough lingers just to the south. Expect increasing northwest winds beginning late tomorrow and lasting through the weekend as the ridge strengthens further. |
7 Day Forecast for Marine Location Near Belvedere, CA
Hourly EDIT Helplocation: 37.83, -122.44 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 171119 afdmtr area forecast discussion national weather service san francisco bay area 415 am pdt Thu aug 17 2017 Synopsis A gradual inland warming trend can be expected through late week as high pressure builds over the region. Overnight and morning clouds will also be common, especially near the coast and in the adjacent valleys. Discussion As of 4:14 am pdt Thursday... Skies are clear thus far over most of napa county, parts of the east bay and south bay, san benito and interior monterey counties while stratus and fog blanket the bays and the rest of the coast early this morning. The marine layer depth is holding steady at 2,000 feet. The marine inversion is fairly well developed and further strengthening occurs today into Saturday as increasing subsidence in advance of a 594 decameter closed mid-upper level high centered approx 700 miles west of the bay area produces large scale sinking and adiabatic warming. Thermal ridging coincides with geopotential height ridging over norcal today into at least the first part of the weekend, and per most recent nam model output warming becomes focused over inland valleys and hills especially over the bay area counties, and in particular over the north bay Friday and Saturday. 925 mb level temperatures reach 28c over north bay tonight and then 30c Friday night meaning temperatures in the north bay hills and mountains will most likely hover in the lower to middle 80s all night as the marine layer becomes increasingly squashed under high pressure. With this in mind, am not having a whole lot of confidence in daytime maximum temperature guidance especially for north bay and east bay areas Friday and Saturday; 90s to near 100 will probably be more common even closer to the bays as the marine layer becomes increasingly compressed. Eventually an active mid latitude zonal jet stream crossing the lower 48 buckles ever so slightly causing a weak and slowly sw moving upper level trough to form over the west coast and east pacific by late this weekend into early next week. Model output has been consistent with showing lower to mid level thermal ridging weakening over the forecast area while this trough develops, however |
with a solidly strong position to start there'll still be remnants of it to persisting causing the marine layer to persist Sunday into Monday. At the same time much drier 925 mb rhs sweep in from the northwest over the weekend probably mixing into the marine based clouds with a tendency for lower level winds, and possibly surface winds to go from onshore to having a weak southerly component. The question is how will all of this influence the marine layer early next week? It's just a guess that there could be an earlier than usual clearing Monday morning. For mid-late next week, a very deep low pressure area develops over the gulf of alaska. The ecmwf, gfs, gem have been lean toward weak long-wave troughing over the west coast. The southern extent of the gulf of alaska low arrives as a trough bringing more pronounced cooling and increasing onshore winds. Coastal drizzle is a possibility in a deepening or even possibly a fully mixed out marine layer. Aviation As of 10:45 pm pdt Wednesday... Marine layer has compressed to 2000 feet and is expected to compress further as an upper level ridge builds off the coast. Stratus is on track to spread into the sfo bay area. The only changes to the previous taf is to raise the cig heights so that sfo and the approach will stay MVFR overnight. Vicinity of ksfo... MVFR ceilings after 10z clearing after 17z. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... MVFR CIGS possibly dipping into ifr between 12z and 18z. Marine As of 2:53 am pdt Thursday... Light variable winds through the day as an east pacific ridge builds inland to the north while a weak trough lingers just to the south. Expect increasing northwest winds beginning late tomorrow and lasting through the weekend as the ridge strengthens further. Mtr watches warnings advisories Tday Sca... Sf bay from 1 pm public forecast: canepa aviation: W pi marine: drp visit us at |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for San Francisco, CA
(wind in knots) EDIT (on/off) Help| 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 | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | |
| Last 24hr | SW G7 | SW | W | SW G5 | W | W G10 | W G14 | W G14 | W G16 | W G12 | W G14 | W G18 | SW G14 | W G16 | W G13 | SW G11 | SW G9 | SW G10 | SW G11 | SW G10 | SW G9 | SW G12 | SW G11 | SW G10 |
| 1 day ago | SW G9 | SW | SW G6 | W G6 | SW G9 | SW G11 | SW G12 | SW G15 | SW G18 | SW G16 | SW G13 | W G14 | SW G18 | SW G17 | W G17 | SW G18 | W G12 | W G11 | W G11 | SW G8 | SW | S | SW G7 | SW |
| 2 days ago | W G15 | SW G17 | W G12 | SW G15 | W G17 | SW G13 | SW G13 | W G15 | W G17 | W G17 | SW G12 | W G18 | W G17 | SW G22 | W G13 | W G15 | SW G16 | W G15 | SW G13 | SW G11 | W G10 | W G8 | SW G9 | SW G10 |
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 | 15 mi | 1.7 hrs | W 5 | 10.00 mi | A Few Clouds | 60°F | 54°F | 80% | 1015 hPa |
| Oakland, Metro Oakland International Airport, CA | 15 mi | 45 min | N 6 | 10.00 mi | Overcast | 61°F | 59°F | 93% | 1015 hPa |
| Hayward, Hayward Air Terminal, CA | 21 mi | 44 min | NNW 3 | 10.00 mi | Overcast | 63°F | 55°F | 76% | 1015.8 hPa |
| Half Moon Bay Airport, CA | 22 mi | 43 min | SSE 6 | 10.00 mi | Overcast | 59°F | 55°F | 88% | 1014.6 hPa |
| Novato / Gnoss Field, CA | 23 mi | 63 min | N 0 | 10.00 mi | Overcast | 61°F | 57°F | 88% | 1015.2 hPa |
| San Carlos Airport, CA | 23 mi | 48 min | WNW 4 | 10.00 mi | Overcast | 63°F | 55°F | 77% | 1015.2 hPa |
| Concord, Buchanan Field, CA | 23 mi | 45 min | W 6 | 10.00 mi | Fair | 62°F | 57°F | 84% | 1013.4 hPa |
Wind History from SFO (wind in knots)
| 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 | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | |
| Last 24hr | Calm | Calm | SE | SE | Calm | SE | N | N | N | NW G19 | W | NW | NW | NW | NW | W | NW | NW | NW | NW | W | W | S | |
| 1 day ago | SW | SW | S | S | SW | SW | SW | SW | SW G24 | W | SW G24 | SW G22 | W | W G24 | W | W | W | SW | SW | W | SW | S | S | |
| 2 days ago | W | W | W | W | SW | W | SW G18 | SW | W | SW | W G23 | W G21 | W G22 | W | W G20 | W | W | W | W | SW | SW | W | SW | SW |
Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Alcatraz Island Click for Map Thu -- 02:07 AM PDT Moonrise Thu -- 02:42 AM PDT 0.07 feet Low Tide Thu -- 06:27 AM PDT Sunrise Thu -- 09:48 AM PDT 4.50 feet High Tide Thu -- 02:24 PM PDT 2.58 feet Low Tide Thu -- 04:45 PM PDT Moonset Thu -- 07:59 PM PDT Sunset Thu -- 08:41 PM PDT 6.50 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 |
| 2 | 0.9 | 0.2 | 0.1 | 0.5 | 1.1 | 2 | 2.9 | 3.8 | 4.4 | 4.5 | 4.2 | 3.6 | 3 | 2.6 | 2.7 | 3.2 | 4 | 4.9 | 5.8 | 6.4 | 6.5 | 6 | 4.9 |
Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
EDIT (on/off) Help One Week of Data| Alcatraz Island W Click for Map Thu -- 12:16 AM PDT -2.59 knots Max Ebb Thu -- 02:07 AM PDT Moonrise Thu -- 04:09 AM PDT 0.01 knots Slack Thu -- 06:27 AM PDT Sunrise Thu -- 07:18 AM PDT 2.54 knots Max Flood Thu -- 10:50 AM PDT -0.00 knots Slack Thu -- 12:56 PM PDT -1.22 knots Max Ebb Thu -- 03:58 PM PDT 0.00 knots Slack Thu -- 04:45 PM PDT Moonset Thu -- 06:57 PM PDT 2.08 knots Max Flood Thu -- 07:59 PM PDT Sunset Thu -- 10:07 PM PDT -0.00 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 |
| -2.6 | -2.4 | -1.9 | -1.2 | -0.2 | 1.1 | 2.1 | 2.5 | 2.4 | 2 | 1 | -0.2 | -1 | -1.2 | -1 | -0.6 | 0 | 1 | 1.8 | 2.1 | 1.8 | 1.2 | 0.2 | -1.1 |
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 (7,2,3,4)
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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. |