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Marine Weather and Tides
Version 3.4 |
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 5:47AM | Sunset 8:37PM | Saturday June 24, 2017 3:24 AM PDT (10:24 UTC) | Moonrise 5:37AM | Moonset 8:17PM | 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- 854 Pm Pdt Fri Jun 23 2017 .small craft advisory in effect until 11 pm pdt this evening... .small craft advisory in effect from Saturday afternoon through Saturday evening... Tonight..SW winds 15 to 25 kt...decreasing to 10 to 20 kt by midnight. Patchy fog after midnight. Sat..SW winds 10 to 20 kt...increasing to 15 to 25 kt in the afternoon. Patchy fog in the morning. Sat night..SW winds 15 to 25 kt...decreasing to 10 to 20 kt. Sun..SW winds 15 to 25 kt. Sun night..SW winds 15 to 25 kt. Mon..SW winds 10 to 20 kt. Tue..SW winds 10 to 20 kt. Wed..SW winds 10 to 20 kt. | PZZ500 854 Pm Pdt Fri Jun 23 2017 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An upper level weather disturbance off the southern california coast will move north tonight, potentially producing isolated Thunderstorms over the southern coastal waters late tonight and Saturday. Otherwise, light southerly winds will continue over the coastal waters tonight before turning westerly and northwesterly and increasing slightly by Saturday afternoon. Wave heights and swell will decrease through the coming days. |
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 240540 afdmtr area forecast discussion national weather service san francisco bay area 1040 pm pdt Fri jun 23 2017 Synopsis Cooling trend started today for most areas as onshore flow returns. The far interior valleys will remain seasonably warm through this evening. The overall trend this weekend and into next week will be a return to more seasonable temperatures along with more extensive night and morning low clouds followed by sunny afternoons. Discussion As of 8:40 pm pdt Friday... Temperatures cooled considerably over the last 24 hours as the marine layer gradually deepened and onshore flow returned. Most locations cooled anywhere from 5 to 15 degrees with a couple locations dropping as much as 20 degrees from yesterday. High temperatures topped out in the mid 60s to low 70s along the coast, mid 70s to low 80s around the bay and mid 80s to low 90s over the interior. A few locations managed to soar into the 100 to 108 range over the warmest southern interior valleys of monterey and san benito counties. Temperatures have cooled since this afternoon and with the trend toward cooler temperatures for Saturday the heat advisory for the interior portions of the east bay, santa clara county and the mountain of monterey and san benito counties will be allowed to expire at 9 pm tonight. The cooling trend will continue through the next few days with temperatures falling on average 3 to 5 degrees each day through the weekend and into early next week. Coastal areas will see little change while inland temperatures will see larger changes as cooler marine air reaches farther inland. No heat advisories are anticipated through the weekend. Low clouds and patchy fog will also return to the region this weekend as an approaching upper level trough deepens the marine layer. Patchy drizzle will also be likely by Monday as the trough axis moves across the district. From previous discussion... One major change to the forecast was to include a slight chance of thunderstorms over monterey san benito late tonight into Saturday. Confidence is rather low, but if it verifies impacts could be huge, especially from a fire weather perspective. For several days now, models have been keying in on the moisture convection near baja tracking north. Latest models do bring the mid-upper level moisture (700-500mb) northward tonight and early Saturday. In addition to the moisture advection, upper level instability increases. Mu CAPE through the layer increases with modified total totals greater than 30 all |
indicating upper level lift. At this point only giving it a 15 pct chance of occurring, but still wanted to add it to the forecast. Medium and longer range models still indicate later next week and towards the end of the month show more pronounced ridging with potential for another round of weak offshore flow and associated warming. CPC has the 6-10 forecast above normal temps for ca. Aviation As of 10:40 pm pdt Friday... For 06z tafs. Widespread ifr ceilings will develop overnight and continue into Saturday morning. Local lifr ceilings and ifr vsbys are also likely. Vfr conditions expected to return to most terminals by 18z Saturday. A weak upper level disturbance approaching from the south late tonight and Saturday morning will produce some mid high level clouds and may also trigger isolated thunderstorms near the coast. Look for similar return time for low clouds on Saturday evening, possibly a few hours earlier. Forecast confidence: moderate vicinity of ksfo...VFR conditions expected to persist at ksfo until about 10z, with ifr ceilings then forecast from about 10-17z. Westerly winds increasing to around 20 knots on Saturday afternoon. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... Ifr lifr ceilings overnight and into early Saturday along with patchy MVFR vsbys. Low clouds expected to clear by 17z Saturday at ksns but probably a couple of hours later at kmry. Mid level clouds late tonight and Saturday with a potential for isolated thunderstorms, but thunderstorm potential is highest offshore. Marine As of 8:54 pm pdt Friday... An upper level weather disturbance off the southern california coast will move north tonight, potentially producing isolated thunderstorms over the southern coastal waters late tonight and Saturday. Otherwise, light southerly winds will continue over the coastal waters tonight before turning westerly and northwesterly and increasing slightly by Saturday afternoon. Wave heights and swell will decrease through the coming days. Mtr watches warnings advisories Tngt Sca... Sf bay until 11 pm public forecast: cw aviation: dykema marine: dykema 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| 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 | -12 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | |
| Last 24hr | SW G7 | NW G8 | SW G11 | W G14 | SW G11 | W G12 | W G14 | W G12 | W G13 | W G15 | W G9 | W G20 | SW G19 | W G11 | SW G9 | W G11 | W G17 | W G7 | SW G10 | SW G7 | SW G8 | SW G10 | W G8 | |
| 1 day ago | SW G9 | SW G11 | W G11 | W G11 | W G12 | SW G16 | W G11 | SW G10 | SW G17 | W G17 | SW G16 | W G19 | W G23 | SW G20 | SW G22 | SW G17 | W G14 | SW G17 | SW G13 | SW G8 | W G10 | SW G9 | SE G5 | |
| 2 days ago | SW | SW G11 | SW G12 | SW G11 | W G11 | W G13 | W G14 | W G11 | SW G13 | SW G18 | SW G14 | W G18 | W G17 | W G13 | W G10 | S G8 | E | SW | W G9 | SW G8 | W G6 | SW G9 | SW G11 |
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 | 29 min | WNW 8 | 10.00 mi | Mostly Cloudy | 58°F | 54°F | 87% | 1013.6 hPa |
| Oakland, Metro Oakland International Airport, CA | 15 mi | 32 min | WNW 8 | 10.00 mi | Overcast | 61°F | 57°F | 87% | 1013.8 hPa |
| Hayward, Hayward Air Terminal, CA | 21 mi | 31 min | NNW 6 | 10.00 mi | Overcast | 60°F | 53°F | 78% | 1014.6 hPa |
| Novato / Gnoss Field, CA | 23 mi | 30 min | NW 4 | 10.00 mi | Mostly Cloudy | 55°F | 53°F | 94% | 1013.9 hPa |
| San Carlos Airport, CA | 23 mi | 30 min | N 0 | 10.00 mi | Overcast | 61°F | 57°F | 88% | 1013.9 hPa |
| Concord, Buchanan Field, CA | 23 mi | 32 min | W 6 | 10.00 mi | Fair | 61°F | 55°F | 81% | 1011.4 hPa |
Wind History from SFO (wind in knots)
| 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 | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | |
| Last 24hr | W | W | NW | Calm | NE | NE | NE | N | N | N | NW | NW | W | W | W | W | W G23 | W | W | W | W | NW | W | W |
| 1 day ago | W | W | NW | Calm | NW | N | N | NE | N | NW | NW | W | W | NW | NW | NW | W | W | W | W | W | W | NW | W |
| 2 days ago | NW | W | W | NW | NW | N | NE | NE | NE | N | NW | NW | NW | NW | NW | NW | W | W | W | W | W | W | NW | W |
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 Sat -- 05:48 AM PDT Sunrise Sat -- 06:36 AM PDT Moonrise Sat -- 06:38 AM PDT -1.73 feet Low Tide Sat -- 01:47 PM PDT 5.10 feet High Tide Sat -- 06:28 PM PDT 2.29 feet Low Tide Sat -- 08:35 PM PDT Sunset Sat -- 09:17 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 |
| 7 | 6.4 | 5 | 3.1 | 1 | -0.6 | -1.6 | -1.7 | -1.1 | -0 | 1.3 | 2.8 | 4 | 4.9 | 5.1 | 4.6 | 3.8 | 2.9 | 2.4 | 2.4 | 3 | 3.9 | 5.1 | 6.1 |
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 Sat -- 01:16 AM PDT -0.00 knots Slack Sat -- 04:33 AM PDT -3.69 knots Max Ebb Sat -- 05:48 AM PDT Sunrise Sat -- 06:36 AM PDT Moonrise Sat -- 08:08 AM PDT 0.00 knots Slack Sat -- 11:17 AM PDT 3.89 knots Max Flood Sat -- 02:58 PM PDT -0.01 knots Slack Sat -- 05:11 PM PDT -1.83 knots Max Ebb Sat -- 08:01 PM PDT 0.00 knots Slack Sat -- 08:35 PM PDT Sunset Sat -- 09:17 PM PDT Moonset Sat -- 10:59 PM PDT 2.82 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 |
| 1.8 | 0.5 | -1.1 | -2.6 | -3.6 | -3.6 | -2.9 | -1.7 | -0.2 | 1.7 | 3.2 | 3.9 | 3.7 | 3 | 1.6 | -0.1 | -1.3 | -1.8 | -1.6 | -1 | -0 | 1.3 | 2.4 | 2.8 |
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 (6,6,7,8)
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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. |