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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 6:17AM | Sunset 7:57PM | Thursday April 26, 2018 6:32 AM PDT (13:32 UTC) | Moonrise 3:42PM | Moonset 3:48AM | Illumination 85% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 301 Am Pdt Thu Apr 26 2018 Today..SW winds 5 to 15 kt...becoming W 10 to 20 kt with gusts up to 30 kt this afternoon. Tonight..SW winds 10 to 20 kt with gusts up to 25 kt. Fri..W winds 5 to 15 kt with gusts up to 25 kt. Fri night..W winds 10 to 20 kt with gusts up to 25 kt. Sat..W winds 10 to 20 kt with gusts up to 25 kt. Sat night..W winds 10 to 20 kt with gusts up to 25 kt. Sun..W winds 5 to 15 kt. Mon..W winds 5 to 15 kt. | PZZ500 301 Am Pdt Thu Apr 26 2018 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light west to northwest winds, but also locally breezy near coastal gaps and prominent points later today. Light to moderate seas will continue through the forecast period with a mixed south and northwest swell developing late in the week. |
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 261145 afdmtr area forecast discussion national weather service san francisco bay area 445 am pdt Thu apr 26 2018 Synopsis Upper low off the coast will keep temperatures below normal through the end of the work week and into the weekend. Some coastal drizzle or very light showers possible later tonight through early Saturday as the upper low moves onshore, however most areas will remain dry with below normal temperatures being the main impact. Cool and dry pattern continues into early next week. Discussion As of 3:27 am pdt Thursday... Marine layer now in excess of 2000 feet with fog product showing another good push of stratus into most inland valleys. Upper low well off the coast is responsible for the deep marine layer and below normal temperature pattern. Unseasonably cool highs today with 60s near the coast bays and only some low to mid 70s inland. The low will slowly approach the coast tonight into Friday. As this occurs some coastal drizzle may occur as the marine layer continues to deepen overnight into Friday as initial vorticity lobs passes over the region. Core of upper low looks to move onshore near CAPE mendocino on Friday with continued slight chance of some coastal drizzle in deepening marine layer environment. Light showers associated with the instability aloft will be confined to the far north bay, mainly later Friday night Saturday morning. Daytime highs Friday and Saturday continue to be unseasonably cool with deep marine layer, substantial clouds and a cool airmass aloft leading to lots of daytime highs only in the 60s throughout the bay area. The main low finally ejects eastward late Saturday night into Sunday. So for the weekend Sunday looks to have more sunshine and slightly warmer temperatures. Longwave trough stays over the west coast with a cold but dry shortwave dropping towards the central coast by Monday and Tuesday. This will continue to keep temperatures on the cool side of normal through the end of the month but no precip expected with this upper level shortwave. Modest warming and drying trend by the |
middle of next week but no hot weather nor storms of note in sight. Aviation As of 4:45 am pdt Thursday... Southwest flow enabling another marine stratus intrusion this morning. Advancing low interacting with stratus deck has resulted in higher bases (500-800 feet higher than yesterday morning) and will likely result in slightly earlier mix outs versus yesterday morning. In addition, southwest flow with higher decks has allowed for a hole in the deck to form over ksfo and most of the northern san francisco bay. Otherwise, a few passing high clouds this morning, stratus returns tonight, generally light onshore winds with locally breezy gusty conditions this afternoon early evening. Vicinity of ksfo... Southwest flow and higher bases working against cigs at ksfo this morning, however, not uncommon to see these types of holes in the deck fill in at or around sunrise. Watch satellite and see what happens approach in full effect. Otherwise, a few passing high clouds this morning, sustained winds up to around 15k this afternoon, with an odd gust or two to around 20kt possible. Lower CIGS potentially return late tonight into sunrise Friday. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... MVFR through mid to late morning. Some model data suggests ovc- bkn MVFR CIGS all day but currently not look that pessimistic given southwest to west flow unfavorable for lingering stratus over terminals. Marine As of 04:39 am pdt Thursday... Generally light west to northwest winds, but also locally breezy near coastal gaps and prominent points later today. Light to moderate seas will continue through the forecast period with a mixed south and northwest swell developing late in the week. Mtr watches warnings advisories Tday None. Public forecast: rww aviation: drp 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| 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 | 5 AM | |
| Last 24hr | SW G8 | W G8 | W G7 | W | W G11 | W G12 | W G13 | SW G15 | SW G17 | W G18 | W G14 | W G14 | SW G14 | W G15 | W G10 | W G11 | NW | SW G13 | SW G7 | SW G8 | SW G6 | W G7 | W G7 | W G7 |
| 1 day ago | SW | W | W G10 | W G8 | W G7 | W G9 | W G11 | W G14 | W G13 | W G15 | W G16 | W G16 | W G18 | W G12 | NW G8 | W G9 | NW G8 | SW G8 | SW G9 | W G14 | SW G9 | SW | S | SW |
| 2 days ago | SW G6 | SW G9 | W G10 | W | W G11 | SW G14 | W G13 | W G14 | W G17 | SW G18 | W G20 | SW G22 | SW G20 | SW G18 | SW G14 | SW G18 | SW G8 | SW G10 | SW G10 | SW G12 | SW G7 | W G8 | W G7 | SW |
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 | 36 min | W 7 | 10.00 mi | Mostly Cloudy | 52°F | 43°F | 72% | 1017 hPa |
| Oakland, Metro Oakland International Airport, CA | 15 mi | 39 min | WNW 10 | 10.00 mi | Mostly Cloudy | 51°F | 45°F | 80% | 1017.2 hPa |
| Hayward, Hayward Air Terminal, CA | 21 mi | 38 min | WNW 7 | 10.00 mi | Overcast | 53°F | 43°F | 69% | 1017.9 hPa |
| Half Moon Bay Airport, CA | 22 mi | 37 min | N 0 | 10.00 mi | Overcast | 50°F | 44°F | 82% | 1017.6 hPa |
| Novato / Gnoss Field, CA | 23 mi | 37 min | NW 8 | 2.00 mi | Overcast with Haze | 50°F | 46°F | 88% | 1016.9 hPa |
| San Carlos Airport, CA | 23 mi | 37 min | W 7 | 10.00 mi | Overcast | 52°F | 44°F | 77% | 1016.9 hPa |
| Concord, Buchanan Field, CA | 23 mi | 39 min | WSW 8 | 10.00 mi | Mostly Cloudy | 53°F | 46°F | 77% | 1015.2 hPa |
Wind History from SFO (wind in knots)
| 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 | 5 AM | 6 AM | |
| Last 24hr | W | S | W | SE | NW | NW | NW | W | W | W | W | W | W | W G21 | SW | W | W | W | W | W | W | W | W | W |
| 1 day ago | W | W | W | NW | NW | NW | NW | W | W | W | W | W | W | NW | W | W | W | W | W | W | W | Calm | SW | W |
| 2 days ago | W | SW | Calm | N | E | NE | N | NW | W | W | W | W | W | W | W | NW | W | W | NW | NW | W | W | S | 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 -- 03:57 AM PDT 1.13 feet Low Tide Thu -- 04:47 AM PDT Moonset Thu -- 06:19 AM PDT Sunrise Thu -- 10:00 AM PDT 5.01 feet High Tide Thu -- 04:00 PM PDT 0.22 feet Low Tide Thu -- 04:41 PM PDT Moonrise Thu -- 07:55 PM PDT Sunset Thu -- 10:48 PM PDT 5.74 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 |
| 4.5 | 3.3 | 2.2 | 1.4 | 1.1 | 1.4 | 2.1 | 3 | 4 | 4.7 | 5 | 4.7 | 3.8 | 2.6 | 1.4 | 0.5 | 0.2 | 0.5 | 1.3 | 2.3 | 3.5 | 4.7 | 5.5 | 5.7 |
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 -- 02:11 AM PDT -2.08 knots Max Ebb Thu -- 04:47 AM PDT Moonset Thu -- 05:20 AM PDT 0.01 knots Slack Thu -- 06:19 AM PDT Sunrise Thu -- 08:21 AM PDT 2.61 knots Max Flood Thu -- 11:25 AM PDT -0.00 knots Slack Thu -- 02:19 PM PDT -2.35 knots Max Ebb Thu -- 04:41 PM PDT Moonrise Thu -- 05:36 PM PDT 0.01 knots Slack Thu -- 07:55 PM PDT Sunset Thu -- 08:45 PM PDT 3.12 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 |
| -0.9 | -1.8 | -2.1 | -2 | -1.4 | -0.4 | 0.9 | 2.1 | 2.6 | 2.5 | 1.9 | 0.6 | -0.8 | -1.9 | -2.3 | -2.2 | -1.8 | -0.8 | 0.7 | 2.1 | 2.9 | 3.1 | 2.7 | 1.6 |
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 (9,2,3,4)
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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. |