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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 6:23 PM PDT (01:23 UTC) | Moonrise 9:53PM | Moonset 10:08AM | Illumination 71% |  |
PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 216 Pm Pdt Tue Aug 20 2019
.small craft advisory in effect until 9 pm pdt this evening...
.small craft advisory in effect from Wednesday afternoon through Wednesday evening...
Rest of today..W winds 15 to 20 kt with gusts up to 30 kt.
Tonight..SW winds 10 to 15 kt with gusts up to 25 kt.
Wed..SW winds 15 to 20 kt with gusts up to 30 kt.
Wed night..SW winds 10 to 15 kt.
Thu..SW winds 10 to 15 kt.
Thu night..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri..SW winds 20 to 25 kt with gusts up to 30 kt.
Sat..SW winds 15 to 20 kt.
.small craft advisory in effect until 9 pm pdt this evening...
.small craft advisory in effect from Wednesday afternoon through Wednesday evening...
Rest of today..W winds 15 to 20 kt with gusts up to 30 kt.
Tonight..SW winds 10 to 15 kt with gusts up to 25 kt.
Wed..SW winds 15 to 20 kt with gusts up to 30 kt.
Wed night..SW winds 10 to 15 kt.
Thu..SW winds 10 to 15 kt.
Thu night..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri..SW winds 20 to 25 kt with gusts up to 30 kt.
Sat..SW winds 15 to 20 kt.
PZZ500 216 Pm 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... Light to moderate northwest winds will persist across the coastal waters through mid-week as high pressure sits over the eastern pacific and a surface low moves into western canada. Locally gusty coastal jets are forecast 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... Light to moderate northwest winds will persist across the coastal waters through mid-week as high pressure sits over the eastern pacific and a surface low moves into western canada. Locally gusty coastal jets are forecast 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 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 202350 afdmtr area forecast discussion national weather service san francisco bay area 450 pm 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 02:30 pm pdt Tuesday... California is positioned between two synoptic scale features early this afternoon -- an advancing trough to the northwest and a retrograding ridge to the southeast. Both of these features have played a role in driving the local weather today with the advancing trough encouraging a deeper marine layer overnight into this morning and the retrograding ridge suppressing the marine layer and forcing warmer temperatures and the mostly skies early this afternoon. While the ridge has taken over as the dominate feature early this afternoon, the advancing trough will wrest control from the ridge, at least across the north bay, through the remainder of the day as cooler, moister air mass advects inland from the west. Latest satellite imagery shows scattered to broken high clouds on the leading edge of this air mass boundary now shifting inland across the mendocino coast and northward at this hour. Expect to see some of these clouds spread into the north bay and parts of the immediate bay area later this afternoon into the evening but will probably arrive too late to drastically impact todays afternoon high temperatures. Forecast models have struggled with the specifics of what happens next but generally agree that the ridge will deflect the advancing trough northward into the pacnw extreme norcal after attempting to invade the golden state. For tonight, the marine layer will become suppressed by the retrograding ridge across the central coast and parts of the bay area but may instead mix out across the sonoma marin coastlines due to the presence of the cooler air aloft in the advancing trough. As such, would not be surprised to see patchy fog and periods of drizzle along the coastline from the san mateo coastline southward through big sur with fractured cloud decks across the north bay. The long range forecast models then depict a steady rise in atmospheric heights over the 7 plus days however that rise will not necessarily dictate a steady rise in temperatures. For tomorrow, the ridge will become the dominate player after the trough has deflected to the north into the pacific northwest and promote the warmest temperatures of this work week for most areas. That said, the north bay high temperatures may somewhat lag behind the rest of the forecast area tomorrow after a secondary vort pulse within the broader parent trough over the pacnw forces it to briefly dip back into northern california. 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. The marine layer should further compress tomorrow night into Thursday morning which will allow Thursday morning's temperatures to slightly outpace Wednesday's. |
By the afternoon, Thursday temperatures will come into line with Wednesdays readings though the north east bay should run slightly warmer than the previous day given the absence of a trough on their northern periphery. 500mb heights continue to increase into Friday as the ridge shifts offshore and amplifies. Despite this, temperatures are forecast to stall or even drop primarily due to a shift in wind direction to the southwest. This shift in wind direction should increase the onshore advection of cool, moist air to inland regions despite the warmer air subsiding from aloft. A warming trend is then expected through the weekend and into early next week with the hottest temperatures anticipated to arrive early to mid next week. The one potential gotcha in the long range forecast is the presence of a potential tropical disturbance (80-90% chance of organization) currently off the southern coast of mexico. GFS euro ensemble members give this system a roughly 33-40% chance of moving into the broader vicinity of the sf monterey bay areas by early next week, potentially introducing increased a wetter, more unstable air mass underneath a broader high pressure ridge. Needless to say, there remains a fair amount of uncertainty in the forecast over the next week. Aviation As of 4:50 pm pdt Tuesday... An upper level ridge over the southwest will expand westward into california. This will compress the marine layer overnight resulting in lower cloud bases but as the marine layer becomes better defined... There should be more widespread low clouds late tonight. Low clouds have mixed out quite well today and will take some time to redevelop so an early return of CIGS is not expected. CIGS not expected at sfo or the approach until after 06z. Vicinity of ksfo... MVFR CIGS after 06z with bases around 1500 ft possibly lowering to near 1200 ft after 12z. West winds 15-18 kt gusting to 25 kt through 04z. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... MVFR CIGS after 04z at mry and after 08z at sns. CIGS lowering to ifr a couple of hours after the CIGS come in. West winds 10 kt gusting 15-18 kt through 04z. Marine As of 04:31 pm pdt Tuesday... Light to moderate northwest winds will persist across the coastal waters through mid-week as high pressure sits over the eastern pacific and a surface low moves into western canada. Locally gusty coastal jets are forecast 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. Mtr watches warnings advisories Tngt Sca... Sf bay until 9 pm sca... Mry bay until 9 pm sca... Pt arena to pt reyes 0-10 nm until 9 pm sca... Pigeon pt to pt pinos 0-10 nm until 9 pm sca... Pt pinos to pt piedras blancas 0-10 nm public forecast: drp aviation: W pi marine: as 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 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 | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | |
| Last 24hr | 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 | SW G9 | SW G10 | SW G16 | SW G16 | SW G15 | SW G17 | W G17 | SW G18 |
| 1 day ago | 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 | W G8 | SW G8 | SW G14 | SW G10 | W G13 | W G13 | W G16 | SW G18 |
| 2 days ago | 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 | SW G11 | SW G12 | SW G17 | SW G19 | SW G19 | SW G21 | SW G21 | W G16 |
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 |
| Oakland, Metro Oakland International Airport, CA | 15 mi | 30 min | W 17 | 10.00 mi | Partly Cloudy | 69°F | 57°F | 66% | 1015.6 hPa |
| San Francisco, San Francisco International Airport, CA | 15 mi | 87 min | W 21 G 26 | 10.00 mi | Partly Cloudy and Breezy | 71°F | 55°F | 57% | 1015.7 hPa |
| Hayward, Hayward Air Terminal, CA | 21 mi | 29 min | W 14 | 10.00 mi | Fair | 68°F | 57°F | 68% | 1016.6 hPa |
| Half Moon Bay Airport, CA | 22 mi | 28 min | NW 11 | 10.00 mi | Partly Cloudy | 63°F | 57°F | 83% | 1016.9 hPa |
| Concord, Buchanan Field, CA | 23 mi | 30 min | WSW 7 | 10.00 mi | Fair | 78°F | 54°F | 43% | 1013 hPa |
| San Carlos Airport, CA | 23 mi | 36 min | W 11 G 15 | 10.00 mi | Clear | 72°F | 53°F | 53% | 1015.9 hPa |
| Novato / Gnoss Field, CA | 23 mi | 48 min | WSW 11 G 17 | 10.00 mi | Fair | 73°F | 55°F | 53% | 1014.9 hPa |
Link to 5 minute data for KSFO
Wind History from SFO (wind in knots)
| 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 | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
| Last 24hr | W | W | W | W G17 | W | W | W | W | W | W | W | W | W | W | W | W | W | W G21 | W | W G22 | W G24 | W G26 | W G26 | W G24 |
| 1 day ago | S | SW | S | S | S | SW | S | S | SW | SW | W | W | W | W | SW | SW | SW | SW | W | SW | W | W | W G21 | W G19 |
| 2 days ago | S | S | S | S | S | S | S | S | S | S | S | S | S | S | E | NE | NE | E | S G20 | S | S | SW | SW G24 | SW G18 |
Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
EDIT Weekend mode (on/off) (on/off) Help One Week of DataAlcatraz Island
Click for Map
Tue -- 03:08 AM PDT 4.78 feet High Tide
Tue -- 06:29 AM PDT Sunrise
Tue -- 09:15 AM PDT 1.26 feet Low Tide
Tue -- 11:08 AM PDT Moonset
Tue -- 03:58 PM PDT 5.27 feet High Tide
Tue -- 07:56 PM PDT Sunset
Tue -- 09:59 PM PDT 1.95 feet Low Tide
Tue -- 10:52 PM PDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 03:08 AM PDT 4.78 feet High Tide
Tue -- 06:29 AM PDT Sunrise
Tue -- 09:15 AM PDT 1.26 feet Low Tide
Tue -- 11:08 AM PDT Moonset
Tue -- 03:58 PM PDT 5.27 feet High Tide
Tue -- 07:56 PM PDT Sunset
Tue -- 09:59 PM PDT 1.95 feet Low Tide
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 |
| 3.3 | 4 | 4.5 | 4.8 | 4.6 | 4.1 | 3.2 | 2.3 | 1.6 | 1.3 | 1.4 | 1.9 | 2.7 | 3.6 | 4.4 | 5.1 | 5.3 | 5 | 4.4 | 3.5 | 2.7 | 2.1 | 1.9 | 2.1 |
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
Tue -- 01:33 AM PDT 1.94 knots Max Flood
Tue -- 04:47 AM PDT -0.00 knots Slack
Tue -- 06:29 AM PDT Sunrise
Tue -- 07:42 AM PDT -1.97 knots Max Ebb
Tue -- 10:46 AM PDT 0.00 knots Slack
Tue -- 11:08 AM PDT Moonset
Tue -- 01:55 PM PDT 2.17 knots Max Flood
Tue -- 05:20 PM PDT -0.00 knots Slack
Tue -- 07:56 PM PDT Sunset
Tue -- 08:10 PM PDT -1.92 knots Max Ebb
Tue -- 10:52 PM PDT Moonrise
Tue -- 11:26 PM PDT 0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 01:33 AM PDT 1.94 knots Max Flood
Tue -- 04:47 AM PDT -0.00 knots Slack
Tue -- 06:29 AM PDT Sunrise
Tue -- 07:42 AM PDT -1.97 knots Max Ebb
Tue -- 10:46 AM PDT 0.00 knots Slack
Tue -- 11:08 AM PDT Moonset
Tue -- 01:55 PM PDT 2.17 knots Max Flood
Tue -- 05:20 PM PDT -0.00 knots Slack
Tue -- 07:56 PM PDT Sunset
Tue -- 08:10 PM PDT -1.92 knots Max Ebb
Tue -- 10:52 PM PDT Moonrise
Tue -- 11:26 PM PDT 0.00 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 | 1.8 | 1.9 | 1.4 | 0.7 | -0.2 | -1.1 | -1.8 | -1.9 | -1.4 | -0.6 | 0.2 | 1.1 | 1.9 | 2.2 | 1.9 | 1.2 | 0.3 | -0.6 | -1.5 | -1.9 | -1.7 | -1 | -0.3 |
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 (21,6,7,8)
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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. |