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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 6:28AM | Sunset 7:57PM | Tuesday August 20, 2019 9:56 AM PDT (16:56 UTC) | Moonrise 9:54PM | Moonset 10:09AM | Illumination 74% |  |
PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 813 Am Pdt Tue Aug 20 2019
Today..NW winds 10 to 15 kt, becoming W 15 to 20 kt this afternoon. Wind waves 3 to 4 ft this morning. W swell 2 to 4 ft at 12 seconds.
Tonight..NW winds 10 to 20 kt with gusts up to 25 kt. NW swell 2 to 4 ft at 10 seconds. Patchy fog.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 3 to 5 ft at 14 seconds. Patchy fog.
Wed night..NW winds 15 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 12 seconds. Patchy fog.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 5 to 7 ft at 10 seconds and sw around 2 ft at 20 seconds. Patchy fog.
Thu night..W winds 10 to 15 kt. W swell 5 to 7 ft at 9 seconds and sw around 2 ft at 18 seconds. Patchy fog.
Fri..SW winds 10 to 15 kt. W swell 4 to 6 ft and sw around 2 ft. Patchy fog.
Sat..NW winds 5 to 10 kt. NW swell 2 to 4 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 08:19 am Tuesday and 2.0 kt at 08:31 pm Tuesday.
Today..NW winds 10 to 15 kt, becoming W 15 to 20 kt this afternoon. Wind waves 3 to 4 ft this morning. W swell 2 to 4 ft at 12 seconds.
Tonight..NW winds 10 to 20 kt with gusts up to 25 kt. NW swell 2 to 4 ft at 10 seconds. Patchy fog.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 3 to 5 ft at 14 seconds. Patchy fog.
Wed night..NW winds 15 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 12 seconds. Patchy fog.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 5 to 7 ft at 10 seconds and sw around 2 ft at 20 seconds. Patchy fog.
Thu night..W winds 10 to 15 kt. W swell 5 to 7 ft at 9 seconds and sw around 2 ft at 18 seconds. Patchy fog.
Fri..SW winds 10 to 15 kt. W swell 4 to 6 ft and sw around 2 ft. Patchy fog.
Sat..NW winds 5 to 10 kt. NW swell 2 to 4 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 08:19 am Tuesday and 2.0 kt at 08:31 pm Tuesday.
PZZ500 813 Am Pdt Tue Aug 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to moderate northwesterly winds will continue over the coastal waters through mid-week as high pressure sits over the eastern pacific. Locally gusty coastal jets are expected south of point arena, pigeon point, and point sur that will create hazardous seas conditions for smaller vessels. Breezy afternoon and evening winds are also forecast over the san francisco bay around the golden gate and through the delta as well as over the Monterey bay. 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 to moderate northwesterly winds will continue over the coastal waters through mid-week as high pressure sits over the eastern pacific. Locally gusty coastal jets are expected south of point arena, pigeon point, and point sur that will create hazardous seas conditions for smaller vessels. Breezy afternoon and evening winds are also forecast over the san francisco bay around the golden gate and through the delta as well as over the Monterey bay. 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 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 201444 cca afdmtr area forecast discussion national weather service san francisco bay area 740 am pdt Tue aug 20 2019 Synopsis A warming trend is forecast through Thursday as high pressure builds over central and southern california. Inland areas will see less in the way of night and morning low clouds as the marine layer compresses. Seasonable temperatures are forecast through the upcoming weekend, along with continued dry conditions. Discussion As of 07:40 am pdt Tuesday... The base of an advancing 546dm 500mb low pressure trough offshore of the pacific northwest has temporarily lowered heights aloft and allowed the marine layer to deepen slightly versus yesterday morning (2600 ft vs 2200 ft on 12z koak sounding). The fort ord profiler shows less of a day over day change as it is farther southward from the trough. As a result, the marine layer is inundating most inland areas approx 2500 ft and below. Above the marine layer, a warm dry air mass looms in response to a retrograding ridge backing westward over the southern half of california. This high pressure ridge will become the dominate synoptic scale feature midweek and result in tomorrow (Wednesday) being the warmest day of the next few. Temperatures tomorrow will range from near normal along the shorelines to up to 10 degrees above normal for the inland areas. Afternoon highs of 60s to low 70s are forecast along the coast, upper 70s to upper 80s for areas in some proximity to a coast shoreline, and into the low to mid 90s for the extreme inland areas far from the coast. A few reports of coastal drizzle came in this morning, but otherwise, the current (overnight) forecast looks on track and no updates are planned until the afternoon package. The main forecast challenges today are determining if how much onshore flow will cool temperatures Thursday and what impacts, if any, the remnants of a tropical system may have across our area early next week. See previous discussion for more information on the current forecast. Previous discussion As of 3:35 am pdt Tuesday... Our weather during the past few days was primarily influenced by a deep marine layer, resulting in widespread night and morning low clouds, local drizzle, and cooler than normal inland temperatures. The first sign that the pattern is changing is evident early this morning with the fort ord profiler indicating a decrease in the depth of the marine layer as an upper ridge over the southern plains and desert southwest begins to build to the west and across southern california. In addition, light southerly low level flow over the weekend is changing to a more typical west and northwest direction. The building ridge and more typical wind patterns will result in a warming trend across our region through Thursday. Satellite currently shows an upper trough offshore along 140w. The models track this trough inland across the pacific northwest on Wednesday, but the trough is expected to remain too far north of our area to have an impact on our weather. In fact, the models agree that the biggest increase in temperatures during the upcoming warming trend will occur on Wednesday. Temperatures are forecast to warm slightly above normal by Wednesday when low to mid 90s will be common in the inland valleys. Persistent light onshore flow will keep coastal temperatures seasonably mild. As the marine layer compresses over the next few days, expect decreasing night and morning low clouds across inland areas, while patchy fog is likely to develop near the ocean. Models forecast a continued gradual increase in h5 heights late in the week and through the weekend as the upper ridge continues to build over california. However, both the GFS and ECMWF indicate the warming trend will stall on Friday, and even reverse in some |
areas with slight cooling forecast from Friday into the weekend. The likely reason for this counterintuitive temperature trend during the extended forecast period is the development of a weak surface trough off the california coast which will turn surface winds to a southerly direction by Friday. This southerly flow will more readily transport marine air inland, especially in places like the north bay valleys and santa cruz county. Forecast temperatures from Friday through Sunday have been reduced below the nbm values and brought more in line with the GFS and ECMWF mos guidance. One wildcard late in the extended period is the possibility of tropical moisture reaching our area during the first half of next week. Longer range models track a weak tropical system near the west coast of mexico to the northwest and to a position off the coast of the baja peninsula by the upcoming weekend. Moisture from this system could then be drawn north and across california sometime early next week. In fact, the 00z GFS develops precipitation over our area by next Tuesday night. There is still a great deal of uncertainty as to how this scenario will play out and any potential impacts in our area are currently at the end of, or just beyond, our extended forecast period. But this is something that will need to be monitored closely over the next few days. Aviation As of 4:39 am pdt Tuesday... For 12z tafs. Widespread stratus under a 3000 ft marine layer has brought MVFR to localized lifr CIGS to area terminals this morning. Low clouds are forecast to scatter out between 17z-22z today depending on location. See tafs for more details. Light onshore flow around 5 to 10 kt will persist through the morning hours becoming moderate and gusty around 10 to 15 kt in the afternoon. Gusts to 25 kt possible over ksfo. Vicinity of ksfo... MVFR CIGS will prevail through the morning hours with clearing anticipated around 18z-22z today. West winds of around 10 kt will prevail overnight becoming moderate and gusty around 10 to 15 kt in the afternoon with gusts to 25 kt possible over ksfo. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... MVFR to ifr CIGS will persist through the morning with clearing is anticipated around 18z-20z today. West winds of around 5 kt will prevail through the morning then increasing to 10 to 15 kt in the afternoon. Marine As of 3:00 am pdt Tuesday... High pressure over the eastern pacific will maintain generally light to moderate northwesterly winds over the coastal waters through mid-week. Locally gusty coastal jets south of point arena, pigeon point and point sur will create hazardous conditions for small vessels. Breezy winds are also forecast for san francisco bay around the golden gate and through the delta, and over the monterey bay. 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. Mtr watches warnings advisories Tday Sca... Sf bay from 12 pm sca... Mry bay from 12 pm sca... Pt arena to pt reyes 0-10 nm from 12 pm sca... Pigeon pt to pt pinos 0-10 nm from 12 pm sca... Pt pinos to pt piedras blancas 0-10 nm public forecast: drp dykema 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| 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 | 9 AM | |
| Last 24hr | W G8 | SW G8 | SW G14 | SW G10 | W G13 | W G13 | W G16 | SW G18 | SW G18 | W G15 | W G8 | SW G9 | SW G11 | SW G12 | SW G11 | W G12 | W G13 | SW G9 | SW G7 | SW G10 | W G13 | W G9 | W G8 | SW G8 |
| 1 day ago | 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 | SW G10 |
| 2 days ago | 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 | W |
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 | 20 mi | 2 hrs | W 8 | 10.00 mi | Overcast | 65°F | 55°F | 70% | 1016.6 hPa |
| Half Moon Bay Airport, CA | 21 mi | 2 hrs | NW 4 | 10.00 mi | Overcast | 61°F | 57°F | 88% | 1017.3 hPa |
| Oakland, Metro Oakland International Airport, CA | 24 mi | 2.1 hrs | W 9 | 10.00 mi | Overcast | 64°F | 55°F | 73% | 1016.7 hPa |
Link to 5 minute data for KSFO
Wind History from SFO (wind in knots)
| 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 | 9 AM | |
| Last 24hr | SW | SW | SW | SW | W | W | W G21 | W G19 | W | W | W | W | W | W | W | W | W | |||||||
| 1 day ago | NE | NE | E | S G20 | S | S | SW | SW G24 | SW G18 | S | SW | SW | SW | W | W | SW | ||||||||
| 2 days ago | NE | S | S | S | S | SW | SW G20 | W | S | S | S | S | S | S | S | S | S | S | S | S | S | E |
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 -- 02:19 AM PDT 4.58 feet High Tide
Tue -- 06:30 AM PDT Sunrise
Tue -- 08:26 AM PDT 1.26 feet Low Tide
Tue -- 11:08 AM PDT Moonset
Tue -- 03:09 PM PDT 5.07 feet High Tide
Tue -- 07:56 PM PDT Sunset
Tue -- 09:10 PM PDT 1.95 feet Low Tide
Tue -- 10:53 PM PDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 02:19 AM PDT 4.58 feet High Tide
Tue -- 06:30 AM PDT Sunrise
Tue -- 08:26 AM PDT 1.26 feet Low Tide
Tue -- 11:08 AM PDT Moonset
Tue -- 03:09 PM PDT 5.07 feet High Tide
Tue -- 07:56 PM PDT Sunset
Tue -- 09:10 PM PDT 1.95 feet Low Tide
Tue -- 10:53 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 |
| 3.7 | 4.3 | 4.6 | 4.5 | 4 | 3.3 | 2.4 | 1.7 | 1.3 | 1.3 | 1.8 | 2.5 | 3.3 | 4.1 | 4.8 | 5.1 | 4.9 | 4.4 | 3.6 | 2.8 | 2.2 | 2 | 2.1 | 2.4 |
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 -- 12:31 AM PDT 0.97 knots Max Flood
Tue -- 03:51 AM PDT -0.00 knots Slack
Tue -- 06:29 AM PDT Sunrise
Tue -- 06:44 AM PDT -1.31 knots Max Ebb
Tue -- 09:47 AM PDT 0.00 knots Slack
Tue -- 11:08 AM PDT Moonset
Tue -- 12:53 PM PDT 1.08 knots Max Flood
Tue -- 04:24 PM PDT -0.00 knots Slack
Tue -- 07:12 PM PDT -1.28 knots Max Ebb
Tue -- 07:56 PM PDT Sunset
Tue -- 10:27 PM PDT 0.00 knots Slack
Tue -- 10:52 PM PDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 12:31 AM PDT 0.97 knots Max Flood
Tue -- 03:51 AM PDT -0.00 knots Slack
Tue -- 06:29 AM PDT Sunrise
Tue -- 06:44 AM PDT -1.31 knots Max Ebb
Tue -- 09:47 AM PDT 0.00 knots Slack
Tue -- 11:08 AM PDT Moonset
Tue -- 12:53 PM PDT 1.08 knots Max Flood
Tue -- 04:24 PM PDT -0.00 knots Slack
Tue -- 07:12 PM PDT -1.28 knots Max Ebb
Tue -- 07:56 PM PDT Sunset
Tue -- 10:27 PM PDT 0.00 knots Slack
Tue -- 10:52 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 |
| 0.9 | 0.9 | 0.7 | 0.4 | -0.1 | -0.7 | -1.2 | -1.3 | -0.9 | -0.4 | 0.1 | 0.6 | 1 | 1.1 | 0.9 | 0.6 | 0.2 | -0.4 | -0.9 | -1.3 | -1.1 | -0.7 | -0.2 | 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 (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. |