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Marine Weather and Tides
Version 3.4 |
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name. |
Sunrise 6:57AM | Sunset 5:49PM | Friday February 15, 2019 11:52 AM PST (19:52 UTC) | Moonrise 1:37PM | Moonset 3:31AM | Illumination 85% | ![]() |
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 857 Am Pst Fri Feb 15 2019
.small craft advisory in effect through this evening...
Today..SW winds 15 to 25 kt. Showers in the morning. Slight chance of Thunderstorms through the day. Showers likely in the afternoon.
Tonight..SW winds 10 to 20 kt. Showers likely.
Sat..W winds 5 to 15 kt. Chance of showers.
Sat night..W winds 5 to 15 kt. Slight chance of showers.
Sun..NW winds 5 to 15 kt. Slight chance of showers.
Washingtons birthday..NW winds 5 to 15 kt.
Tue..NW winds 5 to 15 kt.
.small craft advisory in effect through this evening...
Today..SW winds 15 to 25 kt. Showers in the morning. Slight chance of Thunderstorms through the day. Showers likely in the afternoon.
Tonight..SW winds 10 to 20 kt. Showers likely.
Sat..W winds 5 to 15 kt. Chance of showers.
Sat night..W winds 5 to 15 kt. Slight chance of showers.
Sun..NW winds 5 to 15 kt. Slight chance of showers.
Washingtons birthday..NW winds 5 to 15 kt.
Tue..NW winds 5 to 15 kt.
PZZ500 857 Am Pst Fri Feb 15 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Cooler temperatures, gusty west to northwest winds, scattered showers and possibly a few Thunderstorms will continue into the weekend. A large northwest swell will arrive across the waters today and continue into the weekend.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Cooler temperatures, gusty west to northwest winds, scattered showers and possibly a few Thunderstorms will continue into the weekend. A large northwest swell will arrive across the waters today and continue into 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 definitionFxus66 kmtr 151759 afdmtr area forecast discussion national weather service san francisco bay area 959 am pst Fri feb 15 2019 Synopsis Cool and showery conditions are expected today through the weekend as a cold upper trough digs south along the west coast. Snow levels will lower Friday into Saturday with the potential for accumulating snowfall in the region's highest peaks. Overnight temperatures will turn much colder by early next week as dry weather develops and skies clear. Unsettled conditions could return for the latter half of next week. Discussion As of 09:11 am pst Friday... No major changes to the forecast this morning as isolated to scattered showers continue to move inland across the region. As expected, numerous reports of very small hail are being reported region-wide as cold air advection continues aloft. This too has resulted in lowering snow levels with air temperature below freezing in the region's highest peaks. Thus, cannot rule out snow showers in those higher elevations. Showers will persist as a reinforcing colder mid upper level trough descends southward along the west coast through the weekend. This too will lower snow levels with increasing chances for accumulating snowfall in elevations above 2,500-3,000 feet while rain showers persist off and on across the region. Will have additional updates and details with respect the forecast for the remainder of the weekend this afternoon. Until then, please see the previous forecast discussion below. Prev discussion As of 2:53 am pst Friday... A line of showers moved through the district earlier producing brief, heavy rain as it passed. This line was associated with a cold front that has moved through. Scattered showers are expected to persist today through the weekend as the area remains in a cold, unstable airmass. Temperatures have dropped considerably with the passage of the cold front. Current readings at area airports are generally 15 degrees colder than they were 24 hours ago with mid to upper 40s being reported. At higher elevations, automated weather stations are picking up current temperatures in the 30s and lower 40s. Snow levels are forecast to drop as low as 2500 feet today and perhaps below 2000 feet by late Saturday night. Thus, snowfall is likely on bay area peaks and accumulating snowfall is likely above 3000 feet. Also, small hail is likely at times with heavier showers. Flood waters continue to recede in most areas. The flood warning for the carmel river was cancelled last night, however, water levels on the lower russian river continue to rise and is forecast to crest within the next hour or two. A flood warning remains in effect for the russian river near guerneville. Drier weather is forecast to return by the beginning of the week. |
Clearing skies will result in cold overnight temperatures. Unsettled weather is possible by midweek. Aviation As of 9:59 am pst Friday... Showers will continue across area terminals today in the cold post frontal environment. Vfr except MVFR in heavy showers, steadily lowering freezing levels with snow at highest elevations through the weekend. Deeper layer cooling arrives from the north later today, 500 mb temperatures exceeding -30 celsius into tonight. Steepening temperature lapse rates initiating isolated thunderstorms favoring the bay area by late afternoon and evening, convective potential up to several hundred j kg; will amend to add thunderstorms in tafs as needed. Generally much less wind today, though occasionally gusts to 20-25 knots nearest showers or isolated thunderstorms are possible. Vicinity of ksfo...VFR, gusty wind to 20-25 knots today. Showers today tempo MVFR in showers mid to late evening. Sfo bridge approach... Similar to sfo. Monterey bay terminals...VFR except MVFR in showers particularly this morning. SE wind becoming onshore and locally gusty to 20 knots by late morning. More showers arriving tonight and Saturday morning. Beaches 25 feet swell with moderate period 16 seconds reported from buoy 59 located 400 miles northwest of the bay area. Large, dangerous surf will reach the coastal waters today, a high surf advisory begins 10 am today continuing to 9 pm Saturday. Northwest swell 14 to 17 feet will produce breakers as high as 18 to 25 feet along west and northwest facing beaches. High surf will also bring coastal flooding impacts during high tide today. A coastal flood advisory is in effect 5 am to 10 am this morning. Marine As of 09:42 am pst Friday... Cooler temperatures, gusty west to northwest winds, scattered showers and possibly a few thunderstorms will continue into the weekend. A large northwest swell will arrive across the waters today and continue into the weekend. Mtr watches warnings advisories Tday High surf advisory... Caz006-505-509-529-530 coastal flood advisory... Caz006-505-506-508-509-529-530 sca... Pt arena to pt reyes 0-10 nm sca... Pt reyes to pigeon pt 0-10 nm sca... Pigeon pt to pt pinos 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... Rough bar advisory for sf bar sca... Sf bay sca... Mry bay public forecast: rgass sims aviation: cw marine: cw 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-12 PM | 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 | 7 AM | 8 AM | 9 AM | 10 AM | |
Last 24hr | SW | SW G8 | W G16 | W G20 | S G12 | SW G16 | SW G19 | SW G17 | SW G17 | SW G16 | SW G11 | SW G14 | W G18 | W G15 | SE G6 | W G12 | S G9 | SW G8 | SW G10 | S G11 | SW G14 | SW G13 | W G11 | |
1 day ago | SE G11 | NE G9 | E | SE G9 | S G23 | S G16 | SE G10 | SE G13 | S G15 | SE G21 | SE G12 | SE G15 | SE G14 | SE G18 | SE G15 | S G23 | S G27 | SE G25 | SW G23 | SW G15 | SW G16 | SW G10 | S G11 | W G11 |
2 days ago | SE | E | SE | N | -- | N G11 | N G12 | E | N | SE G7 | SE | E | E | SE G10 | NE | E G11 | SE G12 | SE G10 | E G17 | E G16 | E G12 | E G10 | N |
Airport Reports
EDIT (on/off)  Help Click EDIT to display multiple airportsAirport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
Oakland, Metro Oakland International Airport, CA | 15 mi | 59 min | SW 15 | 10.00 mi | Mostly Cloudy | 54°F | 39°F | 59% | 1016.3 hPa |
San Francisco, San Francisco International Airport, CA | 15 mi | 56 min | SW 20 G 25 | 9.00 mi | Light Rain and Breezy | 53°F | 42°F | 66% | 1015.8 hPa |
Hayward, Hayward Air Terminal, CA | 21 mi | 58 min | SSW 11 | 10.00 mi | Mostly Cloudy | 53°F | 41°F | 64% | 1017 hPa |
Concord, Buchanan Field, CA | 23 mi | 59 min | SW 14 | 10.00 mi | Partly Cloudy | 53°F | 39°F | 59% | 1014.1 hPa |
San Carlos Airport, CA | 23 mi | 65 min | SSW 8 | 5.00 mi | Light Rain | 50°F | 39°F | 67% | 1015.9 hPa |
Novato / Gnoss Field, CA | 23 mi | 57 min | W 14 G 27 | 1.50 mi | Rain | 45°F | 41°F | 87% | 1016.3 hPa |
Wind History from SFO (wind in knots)
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 | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | |
Last 24hr | W | W G17 | W G24 | W G24 | SW G21 | SW | SW | SW G28 | SW G23 | S G23 | SW G28 | SW | SW | SW | SW | W G28 | SW | SW | SW | SW | SW | SW | SW G21 | SW G25 |
1 day ago | SE | SE | S G40 | S G33 | SE G24 | SE | E | SE | S G27 | SE | SE | SE | SE G29 | S G35 | S G34 | S G46 | S G54 | S G45 | SW G33 | SW G31 | SW G17 | S | SW G17 | W |
2 days ago | Calm | Calm | E | SE | SW | NE | E | E | SE | E | SE | E | E | E | SE G20 | SE G27 | SE G28 | SE | E | E | E | E | E | E |
Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of DataAlcatraz Island
Click for Map
Fri -- 01:11 AM PST 2.98 feet Low Tide
Fri -- 03:30 AM PST Moonset
Fri -- 06:59 AM PST Sunrise
Fri -- 07:24 AM PST 6.14 feet High Tide
Fri -- 01:36 PM PST Moonrise
Fri -- 02:33 PM PST -0.27 feet Low Tide
Fri -- 05:48 PM PST Sunset
Fri -- 09:52 PM PST 4.53 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 01:11 AM PST 2.98 feet Low Tide
Fri -- 03:30 AM PST Moonset
Fri -- 06:59 AM PST Sunrise
Fri -- 07:24 AM PST 6.14 feet High Tide
Fri -- 01:36 PM PST Moonrise
Fri -- 02:33 PM PST -0.27 feet Low Tide
Fri -- 05:48 PM PST Sunset
Fri -- 09:52 PM PST 4.53 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
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 | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
3.2 | 3 | 3.1 | 3.6 | 4.2 | 5 | 5.7 | 6.1 | 6 | 5.5 | 4.3 | 2.9 | 1.5 | 0.4 | -0.2 | -0.2 | 0.2 | 1 | 1.9 | 2.9 | 3.7 | 4.4 | 4.5 | 4.3 |
Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
EDIT (on/off)  Help One Week of DataAlcatraz Island W
Click for Map
Fri -- 02:48 AM PST 0.00 knots Slack
Fri -- 03:30 AM PST Moonset
Fri -- 05:49 AM PST 1.91 knots Max Flood
Fri -- 06:59 AM PST Sunrise
Fri -- 08:56 AM PST -0.00 knots Slack
Fri -- 12:14 PM PST -2.76 knots Max Ebb
Fri -- 01:36 PM PST Moonrise
Fri -- 04:00 PM PST 0.00 knots Slack
Fri -- 05:48 PM PST Sunset
Fri -- 07:10 PM PST 2.80 knots Max Flood
Fri -- 10:47 PM PST -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 02:48 AM PST 0.00 knots Slack
Fri -- 03:30 AM PST Moonset
Fri -- 05:49 AM PST 1.91 knots Max Flood
Fri -- 06:59 AM PST Sunrise
Fri -- 08:56 AM PST -0.00 knots Slack
Fri -- 12:14 PM PST -2.76 knots Max Ebb
Fri -- 01:36 PM PST Moonrise
Fri -- 04:00 PM PST 0.00 knots Slack
Fri -- 05:48 PM PST Sunset
Fri -- 07:10 PM PST 2.80 knots Max Flood
Fri -- 10:47 PM PST -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
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 | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
-1.2 | -0.9 | -0.5 | 0.1 | 1 | 1.7 | 1.9 | 1.6 | 0.9 | -0.1 | -1.2 | -2.2 | -2.7 | -2.6 | -2 | -1.1 | -0 | 1.4 | 2.4 | 2.8 | 2.6 | 2.1 | 1 | -0.2 |
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 (14,3,4,5)
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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. |