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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 7:16AM | Sunset 4:53PM | Friday December 14, 2018 9:23 PM PST (05:23 UTC) | Moonrise 12:19PM | Moonset 11:46PM | Illumination 51% |  |
PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 851 Pm Pst Fri Dec 14 2018
Tonight..W winds 5 to 15 kt...becoming northeast after midnight. Showers likely, mainly this evening.
Sat..E winds 5 to 15 kt. A chance of showers.
Sat night..SE winds 5 to 10 kt. A chance of showers.
Sun..SE winds 10 to 20 kt with gusts up to 30 kt. Rain.
Sun night..S winds 15 to 25 kt with gusts up to 30 kt. Rain.
Mon..N winds up to 10 kt.
Mon night..NW winds around 5 kt.
Tue..S winds around 5 kt.
Wed..NE winds around 5 kt.
Tonight..W winds 5 to 15 kt...becoming northeast after midnight. Showers likely, mainly this evening.
Sat..E winds 5 to 15 kt. A chance of showers.
Sat night..SE winds 5 to 10 kt. A chance of showers.
Sun..SE winds 10 to 20 kt with gusts up to 30 kt. Rain.
Sun night..S winds 15 to 25 kt with gusts up to 30 kt. Rain.
Mon..N winds up to 10 kt.
Mon night..NW winds around 5 kt.
Tue..S winds around 5 kt.
Wed..NE winds around 5 kt.
PZZ500 851 Pm Pst Fri Dec 14 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A moderate west to northwest swell will build tonight and result in hazardous conditions through Saturday. Generally light winds will prevail tonight as a weak frontal boundary remains stalled over the region. South to southeasterly winds will then increase Saturday into Sunday ahead of the next and stronger approaching pacific storm system. An even larger and more powerful long period west to northwest swell will move in Sunday afternoon through Monday.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A moderate west to northwest swell will build tonight and result in hazardous conditions through Saturday. Generally light winds will prevail tonight as a weak frontal boundary remains stalled over the region. South to southeasterly winds will then increase Saturday into Sunday ahead of the next and stronger approaching pacific storm system. An even larger and more powerful long period west to northwest swell will move in Sunday afternoon through Monday.
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 150023 afdmtr area forecast discussion national weather service san francisco bay area 423 pm pst Fri dec 14 2018 Synopsis A weak weather system will produce light rain across the sf bay area into this evening. Scattered showers continue Saturday across the north bay. A stronger wetter system impacts the area Sunday. A very large wave train arrives late Sunday into Monday. A return to dry weather is expected late Monday. Discussion As of 03:00 pm pst Friday... A pair of storm systems will bring unsettled weather to the region through the coming days. The first of these two storm systems first arrived earlier today bringing gusty southerly winds up to 50 mph over the higher terrain and continues to encroach on the region from the northwest this afternoon. A north to south line of light pre frontal showers developed along the air mass boundary of the warm sector earlier today, however, these high based showers promptly fizzled upon moving over the santa cruz mountains and diablo range bringing only spotty accumulations of a few hundredths. The southern tail of the main frontal rain band is now moving across the north bay, bringing reports of brief heavy at the santa rosa airport. As of 215pm, precipitation accumulations have been primarily confined to the sonoma coast and coastal range, with just under half of an inch being reported near both monte rio and gualala. Additional accumulations are anticipated through the coming hours across the san francisco bay area. Confidence is high that the surface frontal boundary will continue to move towards san francisco and oakland over the remainder of the daylight hours. From there, the surface frontal boundary will stall out as the upper level support pulls away and lifts towards idaho, leaving behind a stalled frontal boundary over the northern san francisco bay and a moisture rich air mass overhead of the broader region. The main precipitation band will rapidly deteriorate through the evening and it is possible there will be a few hours of little to no activity on the radar around midnight. Short models then agree that a weak secondary pulse will pass over the region late tonight into tomorrow morning, which will provide just enough lift to kickstart the shower activity over the north bay tomorrow. A potent storm system is forecast to impact the forecast area throughout Sunday with lingering showers into Sunday night and early Monday. This storm system is accompanied by a fairly moist air mass in the range of around 1.20-1.30" pwats and also has the potential to tap into the additional lingering moisture orphaned by tonights storm system. Thus, there is the potential for moderate to locally heavy rainfall, primarily over the north bay and isolated sections of the santa cruz and santa lucia ranges on the order of up to 2.00-3.00". Elsewhere, widespread rain of 0.50 to 1.00" is expected to fall regionwide, with locally higher amounts in the north bay valleys and locally lower amounts in the typical rain shadowed portions of the santa clara and salinas valley. Generally speaking, this should come as another round of beneficial rain with only minor nuisance ponding of water and nuisance flooding in prone paved low lying areas. In addition to rain, southerly winds will become gusty ahead of the system, especially along the coast and over the higher terrain. In addition to the rain and wind, this storm system will be responsible for bringing the largest waves so far this season to the coast from late Sunday through Monday. A high surf warning has been issued and is in effect from 9am Sunday through 9pm Monday. The earlier start time accounts for the arrival of the very long forerunner waves which present a significantly increased risk of |
rip currents and sneaker waves. Please review the beaches section for more information about the upcoming high surf event. Aviation As of 4:15 pm pst Friday... A mix ofVFR-MVFR conditions expected to continue as visibilities and cloud bases remain lower in association with a weak frontal boundary now essentially stalled over the sf bay area. Winds will continue generally light and southerly, though locally a bit stronger and gustier vicinity central portions of sf bay through early this evening. Light rain and briefly lower ceilings are possible across the san francisco bay area terminals through mid-evening.VFR conditions are more likely to persist for the monterey bay terminals as the frontal boundary remains stalled to the north. Vicinity of ksfo...VFR conditions expected to generally prevail through the evening rush, though ceilings and visibilities may temporarily reduce to MVFR with a passing shower. Southerly winds to 15 to 20 kt through the early evening hours, then light out of the southeast. Moderate confidence. Sfo bridge approach... Similar to ksfo. Monterey bay terminals...VFR conditions to persist with mid level cloud deck expected to continue over the region. Can't entirely rule out the possibility of a passing shower, which could briefly reduce ceilings and visibilities to MVFR. Moderate confidence. Beaches As of 03:09 pm pst Friday... A potent storm system passing south of aleutian islands will move nearly due east over the coming days. This eastward trajectory will create a dynamic fetch zone where the strongest winds of the storm system will continuously increase the energy within a swell train on the southern flank of the storm, resulting in a very large, long period wnw wave train aimed at the california coast. Very long period forerunners will arrive through the day Sunday and will bring a significantly increased risk of rip currents and sneakers waves to the coast. The largest waves are then forecast to arrive Sunday night through Monday morning, with peak swells of 17 to 21 ft at 19 to 21 seconds currently expected. Large breaking waves of 25 to 40 ft will be possible at west and northwest facing locations, with breakers up to or exceeding 50 ft at favored break points along the coast. As a result, a high surf warning has been issued from 9 am Sunday through 9 pm Monday along the entire coastline. Marine As of 03:09 pm pst Friday... A moderate west to northwest swell will build tonight and result in hazardous conditions through Saturday. Winds will become fairly light tonight as a weak frontal boundary stalls over the region. Southerly winds will increase late Saturday night into Sunday ahead of the next storm system to impact the region. A larger, more powerful long period west to northwest swell will build Sunday into Monday and result in hazardous conditions into early next week. Mtr watches warnings advisories Tngt 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... Mry bay until 5 pm sca... Sf bay until 9 pm public forecast: drp aviation: blier marine beaches: rgass 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| 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 | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | |
| Last 24hr | N G11 | N | NE G15 | N G15 | NE G10 | N G13 | NE | S | E G7 | S | E | NE | SW | S G13 | SW G14 | SW G20 | S G20 | SW G12 | S G10 | SW G9 | W G13 | S G8 | W | W |
| 1 day ago | SW | SW | S | SE G5 | NE | NE | NE | N G9 | N | N G11 | N | N | N | N | N G15 | N | N G17 | N | N | N | N G13 | NE | N | N |
| 2 days ago | S | S | SW | NE | S | W | -- | S | E | NE | NE G16 | NE G12 | NE | N | NE | NE | W G10 | S | SW | SW | SW | SW | S |
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 | 27 min | N 0 | 10.00 mi | Mostly Cloudy | 60°F | 48°F | 65% | 1019.1 hPa |
| Oakland, Metro Oakland International Airport, CA | 15 mi | 30 min | NNE 4 | 10.00 mi | Mostly Cloudy | 55°F | 51°F | 87% | 1019.8 hPa |
| Hayward, Hayward Air Terminal, CA | 21 mi | 29 min | N 0 | 10.00 mi | Overcast | 57°F | 48°F | 74% | 1020.5 hPa |
| Half Moon Bay Airport, CA | 22 mi | 28 min | SE 5 | 8.00 mi | Overcast | 57°F | 51°F | 82% | 1020 hPa |
| Novato / Gnoss Field, CA | 23 mi | 28 min | N 0 | 2.00 mi | Fog/Mist | 52°F | 51°F | 100% | 1020 hPa |
| San Carlos Airport, CA | 23 mi | 36 min | N 0 | 10.00 mi | Overcast | 59°F | 50°F | 72% | 1019.3 hPa |
| Concord, Buchanan Field, CA | 23 mi | 30 min | N 4 | 10.00 mi | Mostly Cloudy | 55°F | 48°F | 80% | 1018.3 hPa |
Wind History from SFO (wind in knots)
| 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 | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | |
| Last 24hr | Calm | Calm | Calm | S | S | Calm | Calm | W | NE | NE | SE | E | E | E | S G20 | S G18 | S G35 | S G27 | S G24 | S G20 | S G21 | E | S | S |
| 1 day ago | Calm | Calm | S | Calm | Calm | Calm | Calm | Calm | S | S | S | S | NE | E | Calm | Calm | Calm | E | NE | N | NE | NE | Calm | SE |
| 2 days ago | W | NW | W | W | NW | W | NW | NE | E | Calm | NE | NE | NE | NE | NE | NE | W | W | 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 DataAlcatraz Island
Click for Map
Sat -- 03:49 AM PST First Quarter
Sat -- 06:08 AM PST 5.07 feet High Tide
Sat -- 07:18 AM PST Sunrise
Sat -- 12:23 PM PST 2.51 feet Low Tide
Sat -- 12:47 PM PST Moonrise
Sat -- 04:51 PM PST Sunset
Sat -- 05:28 PM PST 3.96 feet High Tide
Sat -- 11:40 PM PST 1.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 03:49 AM PST First Quarter
Sat -- 06:08 AM PST 5.07 feet High Tide
Sat -- 07:18 AM PST Sunrise
Sat -- 12:23 PM PST 2.51 feet Low Tide
Sat -- 12:47 PM PST Moonrise
Sat -- 04:51 PM PST Sunset
Sat -- 05:28 PM PST 3.96 feet High Tide
Sat -- 11:40 PM PST 1.20 feet Low 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 |
| 1.2 | 1.7 | 2.6 | 3.4 | 4.2 | 4.8 | 5.1 | 4.9 | 4.5 | 3.9 | 3.3 | 2.8 | 2.5 | 2.6 | 2.8 | 3.3 | 3.7 | 3.9 | 3.9 | 3.6 | 3 | 2.3 | 1.7 | 1.3 |
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
Sat -- 12:34 AM PST 0.00 knots Slack
Sat -- 03:45 AM PST 2.15 knots Max Flood
Sat -- 03:49 AM PST First Quarter
Sat -- 07:18 AM PST Sunrise
Sat -- 07:26 AM PST -0.00 knots Slack
Sat -- 09:51 AM PST -1.46 knots Max Ebb
Sat -- 12:47 PM PST Moonrise
Sat -- 01:37 PM PST 0.00 knots Slack
Sat -- 04:07 PM PST 1.28 knots Max Flood
Sat -- 04:51 PM PST Sunset
Sat -- 07:12 PM PST -0.00 knots Slack
Sat -- 09:57 PM PST -1.64 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 12:34 AM PST 0.00 knots Slack
Sat -- 03:45 AM PST 2.15 knots Max Flood
Sat -- 03:49 AM PST First Quarter
Sat -- 07:18 AM PST Sunrise
Sat -- 07:26 AM PST -0.00 knots Slack
Sat -- 09:51 AM PST -1.46 knots Max Ebb
Sat -- 12:47 PM PST Moonrise
Sat -- 01:37 PM PST 0.00 knots Slack
Sat -- 04:07 PM PST 1.28 knots Max Flood
Sat -- 04:51 PM PST Sunset
Sat -- 07:12 PM PST -0.00 knots Slack
Sat -- 09:57 PM PST -1.64 knots Max Ebb
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 |
| -0.4 | 0.4 | 1.4 | 2 | 2.1 | 1.9 | 1.4 | 0.5 | -0.5 | -1.3 | -1.5 | -1.2 | -0.9 | -0.4 | 0.3 | 1 | 1.3 | 1.2 | 0.8 | 0.2 | -0.6 | -1.4 | -1.6 | -1.4 |
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 (0,6,7,8)
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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. |