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Marine Weather and Tides
Version 3.4 |
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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. |
| Sunrise 5:46AM | Sunset 8:36PM | Thursday June 21, 2018 7:16 AM PDT (14:16 UTC) | Moonrise 1:34PM | Moonset 1:00AM | Illumination 57% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 240 Am Pdt Thu Jun 21 2018 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 10 to 20 kt. Sun..SW winds 15 to 25 kt. Mon..SW winds 5 to 15 kt. Patchy fog. | PZZ500 240 Am Pdt Thu Jun 21 2018 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific will continue to strengthen through the rest of the week and into the weekend. In response, strong and gusty northwest winds are expected to affect the majority of the coastal waters zones through this period. Winds are expected to be strongest over the northern outer most coastal waters, strengthening to near gale force, with gale force gusts, by Friday evening through Saturday morning. As a result of the strong winds, steep and hazardous seas are likely for the majority of the coastal waters through at least the first half of the weekend. |
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 211146 afdmtr area forecast discussion national weather service san francisco bay area 446 am pdt Thu jun 21 2018 Synopsis A robust warming trend will begin over the next several days as high pressure builds off the west coast. This will lead to hot conditions on Saturday with moderate to locally high heat risks across parts of the region. Additionally, winds will turn offshore, bringing heightened fire weather concerns to parts of the area on Saturday. Cooling will commence on Sunday along with the redevelopment of the marine layer for early next week. Discussion As of 3:15 am pdt Thursday... Goes-east fog product reveals areas of stratus again impacting parts of the san francisco bay area and central california coast this early Thursday morning. The fort ord profiler along the monterey bay shoreline indicates the marine layer is running around 1,000 ft deep, similar to what it was 24 hour ago. Despite the similar marine layer depth, the stratus coverage doesn't appear to be quite as widespread as it was yesterday morning. Synoptically-speaking, an upper level high is presently centered in southwestern arizona. A quick shortwave trough is currently pushing through the outer periphery of this high across northern california, and will quickly exit the state within the next 6-12 hours. Some weak ridging is expected to occur behind this shortwave during the day, which should allow for some warming across interior locations this afternoon. By Friday, an upper level ridge will begin to amplify off the california coast, resulting in further warming across interior locations. We'll likely see some locations in the interior north bay, interior east bay, and southern reaches of monterey and san benito counties reach the triple digits for Friday afternoon. The warming will continue on Saturday for what should be the hottest day as the ridge continues to strengthen offshore. The hottest areas of the county warning area -- far northern sonoma and napa counties, far interior east bay, and far southern monterey + san benito counties -- may flirt with 105 degrees on Saturday. The warm-to-hot conditions will likely creep toward the san francisco bay shoreline as well -- 90s to low 100s seem quite probable along the us 101 corridor from gilroy north through san jose and continuing toward redwood city. Temperatures farther north toward sfo and san francisco will likely be cooler with highs along the bay shoreline in the 80s with cooler conditions along the immediate pacific coast. These temperatures are expected to produce moderate to locally high heat risks across much of the interior, and will likely see heat advisory headlines launched later today for certain zones as a result of these forecasted hot conditions. Another concern for late Friday night Saturday will be locally breezy north to northeast winds over the north bay mountains. High-resolution models are starting to capture this event, and are showing wind speeds around 15 to 25 mph with local gusts around 35 mph across far northern napa and sonoma counties. Combined with poor relative humidity recoveries, this will likely lead to heightened fire weather concerns. For Sunday, models have consistently been advertising appreciable cooling across the region as the ridge axis pushes east into the north american continent. Additionally, the gfs, nam, and local in-house WRF model have suggested the potential for a southerly |
surge pushing north along the monterey county coast and continuing toward the golden gate during the day. Cooling will continue into the first half of next week with highs gradually returning close to late june climatological normals. Aviation As of 4:46 am pdt Thursday... For 12z tafs. Marine layer currently sits slightly below 1,000 feet, per the ft. Ord profiler. Goes-16 fog product shows patchy stratus affecting the greater sf bay terminals (bkn ovc deck around 1,200 feet), as well as monterey bay terminals (bkn ovc deck around 500 feet). The shallow stratus should erode by 16-17z for most terminals this morning. Building ridge of high pressure will compress the marine layer even more by this evening. Therefore, not expecting CIGS to form tonight. However, there could be some patchy dense fog that may reduce vsby around the monterey bay region overnight tonight, low confidence on exact timing. Light to moderate west northwest winds this afternoon, locally gusty at times. Moderate-high forecast confidence. Vicinity of ksfo... MVFR CIGS becomingVFR by 16-17z. Onshore winds 15-20 kt, with higher gusts possible by this afternoon. A very compressed marine layer should keep CIGS from forming tonight. Sfo bridge approach... Approach remains clear for now (per smb ob), but intermittent MVFR CIGS possible before 16z. Monterey bay terminals... Lifr ifr CIGS through about 16-17z, then vfr. Light to moderate west northwest winds this afternoon, around 10-12 kt. Compressed marine layer may produce fog tonight, reducing horizontal and vertical vsby by Friday morning. Fire weather As of 3:15 am pdt Wednesday... A pronounced warming and drying trend is forecast for the end of the week as high pressure builds in and winds turn offshore. Saturday presently looks to be the hottest day, with poor overnight relative humidity recoveries for both Friday night and Saturday night. Locally gusty north to northeast winds are possible in the north bay hills Friday night and Saturday morning. A return to cooling and redevelopment of the marine layer appears in store for Sunday into the first part of next week as flow shifts back onshore. Marine As of 2:40 am pdt Thursday... High pressure over the eastern pacific will continue to strengthen through the rest of the week and into the weekend. In response, strong and gusty northwest winds are expected to affect the majority of the coastal waters zones through this period. Winds are expected to be strongest over the northern outer most coastal waters, strengthening to near gale force, with gale force gusts, by Friday evening through Saturday morning. As a result of the strong winds, steep and hazardous seas are likely for the majority of the coastal waters through at least the first half of the weekend. Mtr watches warnings advisories Tday Sca... Pigeon pt to pt pinos 0-10 nm sca... Pt arena to pt reyes 0-10 nm sca... Pt pinos to pt piedras blancas 0-10 nm sca... Pt arena to pigeon pt 10-60 nm sca... Pigeon pt to pt piedras blancas 10-60 nm sca... Pt reyes to pigeon pt 0-10 nm sca... Mry bay from 12 pm public forecast: rowe aviation: bam marine: bam fire weather: rowe 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| 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 G10 | W G10 | W G10 | W G13 | W G12 | W G13 | W G19 | W G24 | W G19 | W G18 | W G16 | W G18 | W G18 | W G20 | W G16 | W G16 | W G17 | W G9 | SW | W G10 | SW G10 | W | W G8 | SW G7 |
| 1 day ago | SW G9 | W G7 | W G10 | SW G10 | SW G13 | W G10 | W G12 | W G13 | W G20 | W G26 | W G21 | W G16 | W G20 | W G14 | W G15 | W G14 | W G12 | W G16 | W G10 | W G13 | W G22 | W G19 | W G12 | SW G8 |
| 2 days ago | SW | W G6 | W | W G11 | W G11 | W G15 | W G13 | W G21 | W G17 | W G17 | W G21 | W G17 | W G15 | SW G17 | W G17 | SW G12 | W G14 | W G8 | SW | W G12 | W G9 | W G6 | W | 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 | 80 min | WSW 14 G 19 | 10.00 mi | Overcast | 55°F | 48°F | 77% | 1016.6 hPa |
| Oakland, Metro Oakland International Airport, CA | 15 mi | 23 min | N 0 | 6.00 mi | Fog/Mist | 54°F | 50°F | 87% | 1016.9 hPa |
| Hayward, Hayward Air Terminal, CA | 21 mi | 22 min | WSW 6 | 10.00 mi | Overcast | 55°F | 48°F | 80% | 1017.9 hPa |
| Half Moon Bay Airport, CA | 22 mi | 21 min | NNW 11 | 6.00 mi | Fog/Mist | 52°F | 50°F | 94% | 1017.6 hPa |
| Novato / Gnoss Field, CA | 23 mi | 41 min | N 0 | 10.00 mi | Fair | 48°F | 46°F | 94% | 1016.3 hPa |
| San Carlos Airport, CA | 23 mi | 21 min | WNW 6 | 10.00 mi | Mostly Cloudy | 54°F | 48°F | 82% | 1017.3 hPa |
| Concord, Buchanan Field, CA | 23 mi | 23 min | SSW 13 | 10.00 mi | Fair | 56°F | 48°F | 77% | 1014.4 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 | W | W | W | W | W | W G23 | W | W | W G23 | W G29 | W G25 | W G25 | W G23 | W G21 | W | W G21 | W | W | W | W | W | W | W G19 |
| 1 day ago | W | W | W | W | NW | NW | W | NW G23 | NW | W G30 | W G23 | W | W | W | W | W | W | W | W | W | W | W | W | SW |
| 2 days ago | SW | W | N | N | NW | NW | NW | W | W | W | W | W G26 | W | W | W | NW | W | W | W | NW | W | W | W | 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 Thu -- 01:31 AM PDT 1.51 feet Low Tide Thu -- 01:59 AM PDT Moonset Thu -- 05:47 AM PDT Sunrise Thu -- 07:14 AM PDT 4.20 feet High Tide Thu -- 01:07 PM PDT 0.79 feet Low Tide Thu -- 02:33 PM PDT Moonrise Thu -- 08:07 PM PDT 5.92 feet High Tide Thu -- 08:35 PM PDT Sunset 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 | 1.6 | 1.6 | 1.9 | 2.6 | 3.3 | 3.9 | 4.2 | 4.1 | 3.5 | 2.7 | 1.8 | 1.1 | 0.8 | 1 | 1.6 | 2.6 | 3.7 | 4.7 | 5.6 | 5.9 | 5.7 | 4.9 | 3.7 |
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 -- 01:59 AM PDT Moonset Thu -- 02:52 AM PDT 0.00 knots Slack Thu -- 05:44 AM PDT 1.81 knots Max Flood Thu -- 05:47 AM PDT Sunrise Thu -- 08:44 AM PDT -0.01 knots Slack Thu -- 11:22 AM PDT -1.65 knots Max Ebb Thu -- 02:33 PM PDT Moonrise Thu -- 02:47 PM PDT 0.00 knots Slack Thu -- 06:03 PM PDT 2.45 knots Max Flood Thu -- 08:35 PM PDT Sunset Thu -- 09:20 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 |
| -1.7 | -1.4 | -0.8 | 0.2 | 1.1 | 1.7 | 1.8 | 1.5 | 0.8 | -0.3 | -1.2 | -1.6 | -1.6 | -1.3 | -0.7 | 0.2 | 1.4 | 2.2 | 2.5 | 2.3 | 1.6 | 0.5 | -0.8 | -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 (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. |