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Marine Weather and Tides
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6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 6:04AM | Sunset 8:27PM | Tuesday July 23, 2019 6:06 AM PDT (13:06 UTC) | Moonrise 11:24PM | Moonset 11:20AM | Illumination 61% |  |
PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 221 Am Pdt Tue Jul 23 2019
.small craft advisory in effect through Wednesday morning...
Today..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 6 to 7 ft. Patchy fog this morning.
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 7 to 8 ft. SW swell around 2 ft at 16 seconds.
Wed..NW winds 10 to 15 kt. Wind waves 6 to 7 ft. SW swell around 2 ft at 15 seconds.
Wed night..NW winds 15 to 20 kt. Wind waves 6 to 7 ft. S swell around 2 ft at 15 seconds. Patchy fog.
Thu..W winds 5 to 10 kt. Wind waves 6 to 7 ft. S swell around 2 ft at 15 seconds.
Thu night..W winds around 5 kt. Wind waves 5 to 6 ft. S swell 2 to 3 ft at 15 seconds. Patchy fog.
Fri..W winds 10 to 15 kt. Wind waves 6 to 7 ft. S swell 2 to 3 ft.
Sat..NW winds 15 to 20 kt. Wind waves 8 to 9 ft. S swell around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 8 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 8 seconds. Maximum ebb current of 1.8 kt at 09:37 am Tuesday and 1.5 kt at 10:31 pm Tuesday.
.small craft advisory in effect through Wednesday morning...
Today..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 6 to 7 ft. Patchy fog this morning.
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 7 to 8 ft. SW swell around 2 ft at 16 seconds.
Wed..NW winds 10 to 15 kt. Wind waves 6 to 7 ft. SW swell around 2 ft at 15 seconds.
Wed night..NW winds 15 to 20 kt. Wind waves 6 to 7 ft. S swell around 2 ft at 15 seconds. Patchy fog.
Thu..W winds 5 to 10 kt. Wind waves 6 to 7 ft. S swell around 2 ft at 15 seconds.
Thu night..W winds around 5 kt. Wind waves 5 to 6 ft. S swell 2 to 3 ft at 15 seconds. Patchy fog.
Fri..W winds 10 to 15 kt. Wind waves 6 to 7 ft. S swell 2 to 3 ft.
Sat..NW winds 15 to 20 kt. Wind waves 8 to 9 ft. S swell around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 8 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 8 seconds. Maximum ebb current of 1.8 kt at 09:37 am Tuesday and 1.5 kt at 10:31 pm Tuesday.
PZZ500 221 Am Pdt Tue Jul 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Breezy northwest winds will persist today across the coastal waters. Winds will increase becoming gusty tonight and Wednesday as high pressure builds into the pacific northwest and northern california. Light southerly swell coupled with short period wind waves will continue through the week.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Breezy northwest winds will persist today across the coastal waters. Winds will increase becoming gusty tonight and Wednesday as high pressure builds into the pacific northwest and northern california. Light southerly swell coupled with short period wind waves will continue through the week.
7 Day Forecast for Marine Location Near Muir Beach, CA
Hourly EDIT Helplocation: 37.78, -122.67 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 231144 afdmtr area forecast discussion national weather service san francisco bay area 444 am pdt Tue jul 23 2019 Synopsis Inland temperatures will warm to above seasonal averages through the remainder of the week and into the upcoming weekend as high pressure dominates the weather pattern. The influence of a shallow marine layer and persistent onshore flow will keep conditions seasonably mild near the coast. Discussion As of 02:51 am pdt Tuesday... A shallow marine layer at about 800 feet in depth has resulted in low clouds over much of the monterey bay southward into the salinas valley. In addition, patchy stratus can be see on goes-w satellite imagery along the san francisco peninsula as well as offshore. These clouds may fill in a bit through sunrise, yet will be less widespread compared to previous mornings. In addition, mid- level moisture rotating around the building mid upper level high pressure over the desert southwest appears to have produced an isolated high-based shower over far eastern portion of san benito county, now moving across western fresno and merced counties. Overall, expecting only a few sprinkles from this if any precipitation is reaching the surface at all. Regardless, look for mid high level clouds to continue to move over the interior portion of the central coast through the morning. The aforementioned mid upper level high pressure to our east will continue to be the dominate weather feature across the southwestern portion of the country through the remainder of the week. However, the ridge is forecast to be suppressed slightly over northern california today as an upper level trough just off of the british columbia coast pushes into the pacific northwest. This will stall the warming trend a bit today with some inland locations potentially cooling by a few degrees. Regardless, look for widespread 80s and 90s across the interior while upper 60s to middle 70s will be common near the coast. The warming trend will continue on Wednesday as the ridge strengthens over the region. Daytime temperatures will likely warm to around 10 degrees above seasonal averages over the interior. Meanwhile, a shallow marine layer and continued onshore flow will maintain cooler conditions near the coast with periods of night morning low clouds and patchy fog. Temperatures cool slightly across inland areas Thursday and Friday, but will remain very warm. Look for an increase in mid upper level clouds late in the week as |
monsoon moisture advects across the region around the ridge over the desert southwest. With this, will need to monitor for any potential of high-based showers and or thunderstorms, mainly for Thursday night. Longer range guidance from both the ECMWF and gfs, as well as the ensembles, indicate the ridge of high pressure will shift westward and over southern california during the upcoming weekend. This will likely result in additional warming with daytime temperatures rebounding to above seasonal averages for much of the region. Thus, will need to monitor for increased heat risks across the interior by the weekend. Aviation As of 4:44 am pdt Tuesday... The marine layer remains compressed under large scale subsidence resulting in vlifr-ifr on the coastline and into the salinas valley.VFR is still reported at kmry, but tempo ifr remains in the forecast for a few hours until 16z this morning. Inland it'sVFR. Similar to yesterday the marine layer should scatter back to the coastline then return locally inland tonight and Wednesday morning. Vicinity of ksfo... Conditions remain favorable forVFR to prevail through the forecast period. Onshore wind increases by early afternoon with gusts up to 20 knots possibly a few higher gusts up to 25 knots. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... Vlifr-ifr then clearing is anticipated around 17z this morning.VFR late morning into the afternoon then vlifr-ifr returning this evening. Marine As of 2:51 am pdt Tuesday... Breezy northwest winds will persist today across the coastal waters. Winds will increase becoming gusty tonight and Wednesday as high pressure builds into the pacific northwest and northern california. Light southerly swell coupled with short period wind waves will continue through the week. Mtr watches warnings advisories Tday Sca... Pigeon pt to pt pinos 0-10 nm from 9 am sca... Pt arena to pt reyes 0-10 nm sca... Pt arena to pigeon pt 10-60 nm sca... Pigeon pt to pt piedras blancas 10-60 nm sca... Pt pinos to pt piedras blancas 0-10 nm sca... Pt reyes to pigeon pt 0-10 nm sca... Mry bay from 9 am sca... Sf bay from 3 pm public forecast: rgass aviation 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 San Francisco, CA
(wind in knots) EDIT (on/off) Help| 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 | 4 AM | 5 AM | |
| Last 24hr | SW G9 | SW G10 | SW G7 | W G10 | W G9 | SW G11 | W G9 | W G11 | W G16 | SW G18 | SW G23 | W G20 | W G22 | SW G20 | SW G10 | SW G12 | SW G12 | S G9 | SW G7 | SW G9 | SW | SW | NW G6 | SW G11 |
| 1 day ago | SW G8 | SW G9 | SW G9 | SW G8 | W G10 | W G11 | W G17 | W G16 | W G11 | SW G11 | W G15 | SW G12 | SW G16 | SW G14 | SW G18 | SW G17 | SW | SW G8 | SW G10 | W G9 | W G10 | W G11 | SW G8 | |
| 2 days ago | SW G11 | W G9 | NW G10 | W G9 | W G10 | W G14 | W G13 | W G15 | NW G12 | W G13 | W G10 | W G11 | W G13 | W G12 | W G9 | W G10 | W G7 | SW G12 | W | SW | SW G9 | SW G8 | SW G10 | SW G9 |
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 | 20 mi | 71 min | WNW 8 | 10.00 mi | A Few Clouds | 59°F | 52°F | 78% | 1015.5 hPa |
| Half Moon Bay Airport, CA | 21 mi | 67 min | ENE 5 | 8.00 mi | Overcast | 54°F | 53°F | 100% | 1016.6 hPa |
| Oakland, Metro Oakland International Airport, CA | 24 mi | 74 min | NNW 4 | 10.00 mi | A Few Clouds | 59°F | 54°F | 83% | 1015.6 hPa |
Wind History from SFO (wind in knots)
| 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 | 4 AM | 5 AM | |
| Last 24hr | NW | W | NW | Calm | NE | NE | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | W | W | W | W | W | NW | W | W |
| 1 day ago | W | W | Calm | Calm | NE | NE | N | N | NW | NW | NW | NW | NW | W | W | NW | W | W | NW | W | W | W | W | NW |
| 2 days ago | SW | S | S | S | S | W | W G17 | NW | W | W | W | NW | W | W | W | W | NW | Calm | W | W | W | W |
Tide / Current Tables for San Francisco Bar, California
EDIT Weekend mode (on/off) (on/off) Help One Week of DataSan Francisco Bar
Click for Map
Tue -- 03:30 AM PDT 4.12 feet High Tide
Tue -- 06:06 AM PDT Sunrise
Tue -- 09:49 AM PDT 1.10 feet Low Tide
Tue -- 12:19 PM PDT Moonset
Tue -- 04:48 PM PDT 4.99 feet High Tide
Tue -- 08:27 PM PDT Sunset
Tue -- 11:07 PM PDT 2.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 03:30 AM PDT 4.12 feet High Tide
Tue -- 06:06 AM PDT Sunrise
Tue -- 09:49 AM PDT 1.10 feet Low Tide
Tue -- 12:19 PM PDT Moonset
Tue -- 04:48 PM PDT 4.99 feet High Tide
Tue -- 08:27 PM PDT Sunset
Tue -- 11:07 PM PDT 2.25 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 |
| 3 | 3.4 | 3.8 | 4.1 | 4.1 | 3.8 | 3.1 | 2.4 | 1.7 | 1.2 | 1.1 | 1.4 | 2 | 2.7 | 3.6 | 4.4 | 4.9 | 5 | 4.7 | 4.2 | 3.5 | 2.9 | 2.4 | 2.2 |
Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
EDIT (on/off) Help One Week of DataSouth Channel
Click for Map
Tue -- 01:51 AM PDT 0.70 knots Max Flood
Tue -- 05:02 AM PDT -0.00 knots Slack
Tue -- 06:06 AM PDT Sunrise
Tue -- 08:00 AM PDT -1.16 knots Max Ebb
Tue -- 11:09 AM PDT 0.00 knots Slack
Tue -- 12:19 PM PDT Moonset
Tue -- 02:20 PM PDT 0.99 knots Max Flood
Tue -- 06:02 PM PDT -0.01 knots Slack
Tue -- 08:26 PM PDT Sunset
Tue -- 08:39 PM PDT -1.08 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 01:51 AM PDT 0.70 knots Max Flood
Tue -- 05:02 AM PDT -0.00 knots Slack
Tue -- 06:06 AM PDT Sunrise
Tue -- 08:00 AM PDT -1.16 knots Max Ebb
Tue -- 11:09 AM PDT 0.00 knots Slack
Tue -- 12:19 PM PDT Moonset
Tue -- 02:20 PM PDT 0.99 knots Max Flood
Tue -- 06:02 PM PDT -0.01 knots Slack
Tue -- 08:26 PM PDT Sunset
Tue -- 08:39 PM PDT -1.08 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 |
| 0.3 | 0.6 | 0.7 | 0.6 | 0.3 | 0 | -0.5 | -0.9 | -1.2 | -0.9 | -0.5 | -0.1 | 0.3 | 0.7 | 1 | 0.9 | 0.7 | 0.4 | 0 | -0.5 | -1 | -1.1 | -0.8 | -0.5 |
Weather Map and Satellite Images
(on/off) HelpWeather Map
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 (9,2,3,4)
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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. |