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Marine Weather and Tides
Version 3.4 |
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 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 6:27AM | Sunset 7:59PM | Monday August 19, 2019 9:08 AM PDT (16:08 UTC) | Moonrise 9:26PM | Moonset 9:12AM | Illumination 83% |  |
PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 812 Am Pdt Mon Aug 19 2019
Today..W winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell around 2 ft at 15 seconds.
Tonight..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell around 2 ft at 15 seconds.
Tue..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 9 seconds.
Tue night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog.
Wed..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft at 14 seconds. Patchy fog.
Wed night..NW winds 20 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 13 seconds. Patchy fog.
Thu..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft and sw around 2 ft. Patchy fog.
Fri..W winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft and sw around 2 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 7 ft with a dominant period of 10 seconds. Across the bar...seas 6 to 8 ft with a dominant period of 10 seconds. Maximum ebb current of 2.0 kt at 08:07 pm Monday and 2.0 kt at 08:19 am Tuesday.
Today..W winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell around 2 ft at 15 seconds.
Tonight..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell around 2 ft at 15 seconds.
Tue..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 9 seconds.
Tue night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog.
Wed..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft at 14 seconds. Patchy fog.
Wed night..NW winds 20 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 13 seconds. Patchy fog.
Thu..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft and sw around 2 ft. Patchy fog.
Fri..W winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft and sw around 2 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 7 ft with a dominant period of 10 seconds. Across the bar...seas 6 to 8 ft with a dominant period of 10 seconds. Maximum ebb current of 2.0 kt at 08:07 pm Monday and 2.0 kt at 08:19 am Tuesday.
PZZ500 812 Am Pdt Mon Aug 19 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds today and tonight across the coastal waters as high pressure off the california coast weakens and a surface low develops offshore of the pacific northwest. Locally gusty winds are expected later today and into tomorrow over the inner coastal waters south of point sur. Mixed seas will continue with shorter period northwest waves at around 8 to 10 seconds, a light longer period west swell, and a light southerly swell.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds today and tonight across the coastal waters as high pressure off the california coast weakens and a surface low develops offshore of the pacific northwest. Locally gusty winds are expected later today and into tomorrow over the inner coastal waters south of point sur. Mixed seas will continue with shorter period northwest waves at around 8 to 10 seconds, a light longer period west swell, and a light southerly swell.
7 Day Forecast for Marine Location Near Daly City, CA
Hourly EDIT Helplocation: 37.77, -122.54 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 191150 afdmtr area forecast discussion national weather service san francisco bay area 450 am pdt Mon aug 19 2019 Synopsis A deep marine layer will prevail through today, maintaining widespread morning low clouds and cooler than normal inland temperatures. Patchy drizzle is possible through mid morning. Warmer temperatures will develop by midweek and continue through the upcoming weekend as high pressure rebuilds. Discussion As of 3:50 am pdt Monday... The marine layer remains deep early this morning with the fort ord profiler indicating a depth of more than 3000 feet. The deep stratus cloud layer has been producing patchy drizzle overnight. The watsonville and salinas airports have reported trace amounts of precipitation and a few locations in the santa cruz mountains have picked up measurable precipitation for the third night in a row (although amounts are mostly only 0.01"). Conditions early this morning are much like yesterday morning with similar marine layer depth and light to moderate onshore flow. So, expect gradual clearing of low clouds once again today, with some areas likely to remain under low clouds well into the afternoon hours. Also, cooler than normal temperatures will continue for inland areas. It appears the eddy circulation that was over our coastal waters yesterday may be dissipating. Thus, low level southerly flow will likely end which should mean more afternoon clearing in the north bay valleys and santa cruz county compared to yesterday, and also slightly warmer temps in these areas. An upper level ridge currently centered over west texas is forecast to expand westward and across southern california by midweek. This will result in a compression of the marine layer over the next few days. In addition, low level flow is forecast to return to a more typical northwesterly direction which should diminish inland marine air transport by midweek. The result will be warming temperatures starting tomorrow, and especially Wednesday and Thursday. An upper trough is forecast to move over the ridge and into the pacific northwest on Wednesday, but is not expected to have a material impact on our weather. By Thursday inland valleys highs are forecast reach back into the 90s and be about 8-12 degrees warmer than today, yet not nearly as warm as last Wednesday Thursday. Although the upper ridge is forecast to strengthen a bit more late in the week and into next weekend, both the GFS and ecmwf indicate an end to the warming trend by Friday and even some localized cooling on Friday and Saturday. This unexpected temperature trend can likely be attributed to the development of a |
surface trough offshore by Friday (something both the GFS and ecmwf forecast). This trough will generate light southerly low level flow along our coast from Friday on into the weekend. Southerly flow will allow for better inland transport of marine air and thus put an end to the warming trend, or reverse it in locations such as the north bay valleys and santa cruz county. Something to watch in the longer range is the potential for a tropical system developing off the west coast of mexico and then tracking northwest near the baja peninsula. Based on current model output there is at least an outside chance that moisture from this system could make it as far north as central california during the first half of next week. Aviation As of 4:50 am pdt Monday... Stratus in a deep marine layer continues to advance inland. METAR observations show MVFR cloud ceilings are fairly widespread, only far inland valleys are holding ontoVFR. Along the immediate coastline ifr is reported along with patchy drizzle. Pressure gradients and winds should focus more from the west today versus on Sunday, diurnal warming and mixing winds eroding the stratus back to the coastline VFR by late morning and afternoon. The WRF model then shows the stratus layer rolling back inland this evening and tonight. Ceilings tonight similarly returning to MVFR-ifr categories exceptVFR well inland. Vicinity of ksfo... MVFR forecast until 17z thenVFR, west winds increasing to 15 knots with gusts to 20 to 25 knots 20z today. MVFR ceiling returning by mid evening and for the overnight hours. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... MVFR ceilings until 18z-19z.VFR in the afternoon then MVFR returning early to mid evening and for the overnight hours. Marine As of 3:06 am pdt Monday... High pressure off the california coast is weakening as a low pressure system develops off the pacific northwest resulting in decreasing winds. However, gusty winds will develop over the southern inner coastal waters later today into Tuesday. The sea state will remain dominated by shorter period northwest waves at around 8 to 10 seconds along with a light southerly swell. Mtr watches warnings advisories Tday Sca... Pt pinos to pt piedras blancas 0-10 nm from 5 pm public forecast: dykema 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| 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 | 7 AM | 8 AM | |
| Last 24hr | W | SW G11 | SW G12 | SW G17 | SW G19 | SW G19 | SW G21 | SW G21 | W G16 | SW G18 | SW G17 | SW G19 | SW G17 | SW G16 | SW G12 | SW G11 | W G12 | SW G10 | SW G8 | SW G8 | SW | SW | SW | W |
| 1 day ago | SW G14 | SW G15 | SW G19 | SW G19 | SW G17 | W G21 | W G18 | SW G20 | SW G17 | SW G16 | SW G16 | W G15 | W G20 | W G14 | SW G14 | SW G15 | SW G15 | SW G9 | SW | SW | SW | S | S | SW G8 |
| 2 days ago | SW G13 | W G19 | SW G12 | W G14 | SW G14 | W G15 | SW G21 | SW G23 | SW G20 | W G15 | SW G19 | SW G19 | W G18 | SW G13 | SW G20 | SW G21 | SW G16 | SW G14 | W G16 | SW G20 | SW G11 | SW G11 | SW | SW G10 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| San Francisco, San Francisco International Airport, CA | 14 mi | 2.2 hrs | W 6 | 10.00 mi | Overcast | 61°F | 54°F | 78% | 1014.6 hPa |
| Oakland, Metro Oakland International Airport, CA | 18 mi | 2.3 hrs | WSW 8 | 10.00 mi | Overcast | 62°F | 55°F | 78% | 1014.6 hPa |
| Half Moon Bay Airport, CA | 18 mi | 94 min | SE 4 | 1.75 mi | Fog/Mist | 57°F | 57°F | 100% | 1015.2 hPa |
| San Carlos Airport, CA | 23 mi | 82 min | WSW 6 | 10.00 mi | Overcast | 61°F | 55°F | 83% | 1015.2 hPa |
| Hayward, Hayward Air Terminal, CA | 24 mi | 2.2 hrs | WSW 6 | 10.00 mi | Overcast | 61°F | 55°F | 81% | 1015.3 hPa |
Link to 5 minute data for KSFO
Wind History from SFO (wind in knots)
| 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 | 7 AM | 8 AM | |
| Last 24hr | E | NE | NE | E | S G20 | S | S | SW | SW G24 | SW G18 | S | SW | S | S | S | SW | S | S | SW | SW | W | W | W | W |
| 1 day ago | N | NE | S | S | S | S | SW | SW G20 | W | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| 2 days ago | Calm | NE | N | N | NW | NW | NW | NW | NW | NW | NW | NW | W | W | W | W | W | S | W | Calm | SW | S | S | S |
Tide / Current Tables for Ocean Beach, California
EDIT Weekend mode (on/off) (on/off) Help One Week of DataOcean Beach
Click for Map
Mon -- 01:20 AM PDT 5.07 feet High Tide
Mon -- 06:28 AM PDT Sunrise
Mon -- 07:40 AM PDT 0.85 feet Low Tide
Mon -- 10:11 AM PDT Moonset
Mon -- 02:25 PM PDT 5.13 feet High Tide
Mon -- 07:57 PM PDT Sunset
Mon -- 08:13 PM PDT 2.11 feet Low Tide
Mon -- 10:25 PM PDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 01:20 AM PDT 5.07 feet High Tide
Mon -- 06:28 AM PDT Sunrise
Mon -- 07:40 AM PDT 0.85 feet Low Tide
Mon -- 10:11 AM PDT Moonset
Mon -- 02:25 PM PDT 5.13 feet High Tide
Mon -- 07:57 PM PDT Sunset
Mon -- 08:13 PM PDT 2.11 feet Low Tide
Mon -- 10:25 PM PDT Moonrise
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 |
| 4.7 | 5 | 5 | 4.4 | 3.5 | 2.4 | 1.5 | 1 | 0.9 | 1.2 | 1.9 | 2.9 | 3.8 | 4.6 | 5.1 | 5 | 4.6 | 3.8 | 3 | 2.4 | 2.1 | 2.2 | 2.6 | 3.3 |
Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
EDIT (on/off) Help One Week of DataSouth Channel
Click for Map
Mon -- 03:07 AM PDT -0.00 knots Slack
Mon -- 06:02 AM PDT -1.49 knots Max Ebb
Mon -- 06:29 AM PDT Sunrise
Mon -- 09:17 AM PDT 0.01 knots Slack
Mon -- 10:11 AM PDT Moonset
Mon -- 12:17 PM PDT 1.19 knots Max Flood
Mon -- 03:53 PM PDT -0.01 knots Slack
Mon -- 06:29 PM PDT -1.26 knots Max Ebb
Mon -- 07:57 PM PDT Sunset
Mon -- 09:39 PM PDT 0.00 knots Slack
Mon -- 10:25 PM PDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 03:07 AM PDT -0.00 knots Slack
Mon -- 06:02 AM PDT -1.49 knots Max Ebb
Mon -- 06:29 AM PDT Sunrise
Mon -- 09:17 AM PDT 0.01 knots Slack
Mon -- 10:11 AM PDT Moonset
Mon -- 12:17 PM PDT 1.19 knots Max Flood
Mon -- 03:53 PM PDT -0.01 knots Slack
Mon -- 06:29 PM PDT -1.26 knots Max Ebb
Mon -- 07:57 PM PDT Sunset
Mon -- 09:39 PM PDT 0.00 knots Slack
Mon -- 10:25 PM PDT Moonrise
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 | 0.9 | 0.5 | 0.1 | -0.6 | -1.2 | -1.5 | -1.3 | -0.7 | -0.2 | 0.4 | 0.9 | 1.2 | 1.1 | 0.9 | 0.5 | -0.1 | -0.7 | -1.2 | -1.2 | -0.8 | -0.3 | 0.2 | 0.6 |
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 (12,3,4,5)
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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. |