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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 5:48AM | Sunset 8:36PM | Monday June 26, 2017 3:21 PM PDT (22:21 UTC) | Moonrise 7:49AM | Moonset 9:58PM | Illumination 8% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ531 San Francisco Bay South Of The Bay Bridge- 128 Pm Pdt Mon Jun 26 2017 Tonight..W winds 10 to 20 kt...decreasing to 10 kt after midnight. Tue..W winds 10 kt...increasing to 10 to 20 kt in the afternoon. Tue night..W winds 15 to 25 kt...decreasing to 10 kt after midnight. Patchy fog after midnight. Wed..W winds 10 to 20 kt. Patchy fog in the morning. Wed night..W winds 5 to 15 kt. Patchy fog after midnight. Thu..SW winds 10 kt. Patchy fog. Fri..SW winds 10 kt. Patchy fog. Sat..SW winds 10 kt. Patchy fog. | PZZ500 128 Pm Pdt Mon Jun 26 2017 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure remains located over the eastern pacific. Locally gusty winds are forecast along the immediate coast and in san francisco bay today. A dominant southerly swell will persist into Wednesday morning. |
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 262043 afdmtr area forecast discussion national weather service san francisco bay area 143 pm pdt Mon jun 26 2017 Synopsis Seasonably cool temperatures through midweek then slight warming as a ridge builds Thursday and Friday. Slight cooling back towards normal over the weekend as another weak trough passes over the region. Dry weather the next 7 days with night and morning coastal clouds followed by sunny afternoons. Discussion As of 1:43 pm pdt Monday... Skies have turned mostly sunny across the district with temperatures running in the upper 60s to 70s. The marine layer is poorly defined at around 2000 feet with not too much warm air aloft. Northerly gradients from arcata to sfo are nearly flat with 4mb from sfo to santa barbara. Onshore gradients currently at 2.1 mb will ramp up this evening with weak cool advection and a shortwave trough moving onshore over oregon. This all sets the stage for a near or slightly below normal temperature regime the next day or two. Some weak ridging is forecast by Thursday which should allow inland temperatures to nudge slightly warmer. However day to day changes will be subtle but if anything should trend on the cool side of normal. The 12z ECMWF brings another weak trough over northern california Saturday that will keep onshore flow and seasonably cool temps in place. Looking ahead to the 4th of july holiday the pattern looks zonal Sunday through Monday then a trough may dig into the pacific northwest but the end result for the bay area would likely mean some dry north winds that could keep marine clouds to a minimum. Were heading towards the peak of the summer doldrums here with no precipitation in the forecast with the marine layer likely to set up long term residence for july and august. Aviation As of 11:27 am pdt Monday... It's been extra challenging to forecast stratus CIGS in the last 12-18 hours; a classic example as to the sensitivities of marine based clouds interacting with area topography and other finer scale waves propagating through the atmosphere. This complexity, of course, greatly reduces forecast confidence. Similarly complex weather even at this late morning hour there is an ongoing stratus feed into the bay area while a sharp stratus no stratus line extends south from san mateo county. Area-wide dewpoint |
temperatures are a couple degrees lower than sea surface temps which should generate more coastal stratus and add to the stratus feed entering the bay area today and tonight, and while the set-up is similarly true along the north central coast, other influences by local terrain, etc. Are causing the leading edge of the stratus field to dissipate. 18z tafs for the bay area are geared toward ongoing MVFR CIGS with occasional mixing causing CIGS to mix out to few-sct this afternoon during maximum diurnal warming. All the while the marine layer is deep near 3,000 feet and undergoing a mix of cooling warming at 925 mb; btw, this is a different solution as compared to yesterday's nam run when it was showing cooling of 1c-2c at 925 mb level today. Tonight's 925 mb temp change is more consistent with previous runs indicating 2c-4c cooling south bay and north central coast. Vicinity of ksfo... Thought is that stratus will continue to reach the terminal with tempo sct 20z-24z today. Early return possible this evening if stratus along the coast remains intact, onshore winds and deep marine layer otherwise favorable for more stratus. West wind gusts up to 20-25 knots most likely during maximum afternoon warming. Sfo bridge approach... Coordinated with cwsu, better chances forVFR in the approach today and similarly this evening. Low confidence regarding tonight's stratus coverage. Monterey bay terminals...VFR. MVFR CIGS probable this evening then MVFR prevailing through 18z Tuesday with a deep marine layer. Marine As of 01:28 pm pdt Monday... High pressure remains located over the eastern pacific. Locally gusty winds are forecast along the immediate coast and in san francisco bay today. A dominant southerly swell will persist into Wednesday morning. Mtr watches warnings advisories Tngt Sca... Sf bay until 9 pm sca... Mry bay until 9 pm sca... Pigeon pt to pt pinos 0-10 nm until 9 pm sca... Pt pinos to pt piedras blancas 0-10 nm public forecast: rww aviation: canepa marine: canepa 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| 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 | 12 PM | 1 PM | 2 PM | |
| Last 24hr | W G12 | W G11 | W G12 | W G14 | W G14 | W G11 | W G12 | W G8 | W G10 | W G12 | W G10 | W G12 | W G9 | W G11 | W G11 | W G8 | SW G7 | SW | W | W G10 | W G8 | W G10 | W G11 | W G12 |
| 1 day ago | W G11 | W G12 | W G13 | W G11 | W G11 | W G11 | W G10 | W G10 | W G9 | W G9 | W G9 | W G9 | W G10 | SW G8 | W G8 | SW | W | W G7 | W G7 | W G9 | W G9 | W G9 | W G12 | W G10 |
| 2 days ago | W G12 | W | W G12 | W G11 | W G11 | W G11 | W G11 | W G8 | W G10 | W | W G7 | W G8 | W | W | W | W G8 | W | W G8 | W G6 | W | W | W | W | W 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 | 4 mi | 26 min | W 16 | 10.00 mi | A Few Clouds | 72°F | 54°F | 53% | 1016.8 hPa |
| Oakland, Metro Oakland International Airport, CA | 9 mi | 29 min | W 15 | 10.00 mi | A Few Clouds | 75°F | 55°F | 52% | 1016.8 hPa |
| San Carlos Airport, CA | 12 mi | 34 min | WNW 1 G 16 | 10.00 mi | Clear | 75°F | 55°F | 50% | 1016.6 hPa |
| Half Moon Bay Airport, CA | 13 mi | 27 min | NW 11 G 16 | mi | Fair | 64°F | 57°F | 78% | 1017.6 hPa |
| Hayward, Hayward Air Terminal, CA | 14 mi | 28 min | WNW 15 | 10.00 mi | Fair | 74°F | 52°F | 46% | 1017.7 hPa |
| Mountain View, Moffett Field, CA | 24 mi | 26 min | NNW 16 | 10.00 mi | Fair | 73°F | 57°F | 57% | 1017 hPa |
Wind History from SFO (wind in knots)
| 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 | 12 PM | 1 PM | 2 PM | |
| Last 24hr | W | W | W | W | W G25 | W | W | W | W | W | W | W | W | W | W | W | W | W | W | W | W | W G18 | W G21 | W G23 |
| 1 day ago | NW G24 | W | W | W | W | W | W | W | W | W | W | W | W | W | SW | W | W | W | W | W | W | W | W | W |
| 2 days ago | NW | W | W | W | W | W G23 | W | W | W | W | NW | W | W | W | W | W | W | NW | NW | NW | NW | NW | NW | NW |
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 Mon -- 02:03 AM PDT 7.95 feet High Tide Mon -- 05:49 AM PDT Sunrise Mon -- 08:49 AM PDT Moonrise Mon -- 09:06 AM PDT -1.74 feet Low Tide Mon -- 04:01 PM PDT 6.66 feet High Tide Mon -- 08:35 PM PDT Sunset Mon -- 09:14 PM PDT 2.33 feet Low Tide Mon -- 10:58 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 |
| 6.4 | 7.5 | 7.9 | 7.6 | 6.3 | 4.3 | 2.1 | 0.1 | -1.2 | -1.7 | -1.4 | -0.2 | 1.4 | 3.3 | 5 | 6.2 | 6.7 | 6.3 | 5.2 | 3.9 | 2.9 | 2.3 | 2.6 | 3.5 |
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 Mon -- 02:16 AM PDT -0.00 knots Slack Mon -- 05:49 AM PDT Sunrise Mon -- 05:51 AM PDT -1.74 knots Max Ebb Mon -- 08:49 AM PDT Moonrise Mon -- 09:13 AM PDT 0.00 knots Slack Mon -- 12:27 PM PDT 1.37 knots Max Flood Mon -- 03:57 PM PDT -0.01 knots Slack Mon -- 06:31 PM PDT -0.89 knots Max Ebb Mon -- 08:35 PM PDT Sunset Mon -- 09:17 PM PDT 0.01 knots Slack Mon -- 10:58 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 |
| 1 | 0.7 | 0.2 | -0.5 | -1.1 | -1.6 | -1.7 | -1.4 | -0.9 | -0.2 | 0.5 | 1.1 | 1.3 | 1.3 | 1.1 | 0.6 | -0 | -0.6 | -0.8 | -0.8 | -0.6 | -0.1 | 0.3 | 0.7 |
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 (18,4,5,8)
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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. |