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Marine Weather and Tides
Version 3.4 |
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 6:01AM | Sunset 8:31PM | Thursday July 18, 2019 1:58 AM PDT (08:58 UTC) | Moonrise 8:59PM | Moonset 6:36AM | Illumination 98% |  |
PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 856 Pm Pdt Wed Jul 17 2019
Tonight..W winds 10 to 20 kt. Wind waves 3 to 5 ft. SWell S around 3 ft.
Thu..SW winds 10 to 15 kt. Wind waves 5 to 6 ft.
Thu night..S winds 10 to 15 kt. Wind waves 5 to 6 ft.
Fri..S winds 10 to 15 kt. Wind waves 5 to 6 ft.
Fri night..S winds 5 to 10 kt. Wind waves 4 to 5 ft. Patchy fog.
Sat..S winds 5 to 10 kt. Wind waves 4 to 5 ft.
Sat night..W winds around 5 kt. Wind waves 4 to 5 ft. Patchy fog.
Sun..SW winds 5 to 10 kt. Wind waves 4 to 5 ft. Patchy fog.
Mon..W winds 10 to 15 kt. Wind waves around 3 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...southwest swell 3 to 4 ft with a dominant period of 17 seconds. Across the bar...southwest swell 4 to 5 ft with a dominant period of 17 seconds. Maximum ebb current of 2.9 kt at 06:13 am Thursday and 1.7 kt at 07:01 pm Thursday.
Tonight..W winds 10 to 20 kt. Wind waves 3 to 5 ft. SWell S around 3 ft.
Thu..SW winds 10 to 15 kt. Wind waves 5 to 6 ft.
Thu night..S winds 10 to 15 kt. Wind waves 5 to 6 ft.
Fri..S winds 10 to 15 kt. Wind waves 5 to 6 ft.
Fri night..S winds 5 to 10 kt. Wind waves 4 to 5 ft. Patchy fog.
Sat..S winds 5 to 10 kt. Wind waves 4 to 5 ft.
Sat night..W winds around 5 kt. Wind waves 4 to 5 ft. Patchy fog.
Sun..SW winds 5 to 10 kt. Wind waves 4 to 5 ft. Patchy fog.
Mon..W winds 10 to 15 kt. Wind waves around 3 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...southwest swell 3 to 4 ft with a dominant period of 17 seconds. Across the bar...southwest swell 4 to 5 ft with a dominant period of 17 seconds. Maximum ebb current of 2.9 kt at 06:13 am Thursday and 1.7 kt at 07:01 pm Thursday.
PZZ500 856 Pm Pdt Wed Jul 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Wind flow in the near term is from the south from the Monterey bay southward along the big sur coast and variable to northwest over the remainder of the coastal waters. Gusty west winds developing over the san francisco bay to the delta Thursday afternoon and evening. Light long period southerly swell will continue into Thursday.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Wind flow in the near term is from the south from the Monterey bay southward along the big sur coast and variable to northwest over the remainder of the coastal waters. Gusty west winds developing over the san francisco bay to the delta Thursday afternoon and evening. Light long period southerly swell will continue into Thursday.
7 Day Forecast for Marine Location Near El Granada, CA
Hourly EDIT Helplocation: 37.5, -122.48 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 180525 afdmtr area forecast discussion national weather service san francisco bay area 1025 pm pdt Wed jul 17 2019 Synopsis A gradual cooling trend will continue through late week with periods of night and morning low clouds. Temperatures will begin to warm slightly this weekend and rebound back to near seasonal averages by next week. Discussion As of 09:00 pm pdt Wednesday... Interesting evolution in today's weather under sunny skies. Temperatures were forecast to moderate or drop a few degrees under a somewhat flat flow aloft. Upon closer inspection the cooldown did occur across the coast and inland valleys - both santa cruz and santa rosa were much cool today. The interesting part is above the seabreeze with a slight northerly flow over the hills leading to much warmer weather. In other words, all about micro-climates today with some warmer and some colder. The last few images of the visible satellite show the marine layer makes its nightly return with some low clouds already pushing into the salinas valley. The marine layer will likely fill in pretty solid overnight. The latest 00z models even show a few hundredths of precip, which is usually a sign of patchy drizzle. Latest forecast remains on track for the near term and see no reason to update the forecast. Night and morning clouds will continue over the next few days with onshore flow. The resulting sensible weather will be continued cooling through at least Saturday. A slight uptick in temperatures are expected on Sunday with slight warming aloft and high pressure to the east. Next week is beginning to look a little different than what it did a few days ago. A ridge is still forecast to build over the four corners region and nudge westward early next week. The westward nudging looks to now be hampered by a trough deepening off the west coast. The forecast will still show a warming trend next week, but it will be a battle between the ridge to the east and the trough to the west for how warm it actually gets. Stay tuned... |
Aviation As of 10:25 pm pdt Wednesday... Vlifr-ifr is proceeding to cover the immediate coastline due to low stratus ceilings and fog. Vlifr-ifr is likely to extend through the golden gate to the east bay as well as extending into the salinas valley otherwise vfr is quite likely to continue most inland locations for tonight and Thursday. Winds are overall much weaker since the synoptic pattern over norcal has changed since yesterday. Boundary layer winds on the WRF model and on the NAM 925 mb and 850 mb wind fields indicate a weak cyclonic circulation will drift southwestward to the coastal waters west of the north bay Thursday setting up a more robust onshore flow for Thursday, this should boost seabreezes everywhere more than seen today; 06z TAF wind speed forecasts generally above statistical guidance. Vicinity of ksfo...VFR continues tonight into Thursday. West wind gusts near 25 knots or slightly higher resume Thursday afternoon and evening. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... Vlifr-ifr due to low stratus ceilings and fog tonight and Thursday morning. Clearing toVFR likely by late Thursday morning, onshore winds more robust Thursday afternoon and early evening than today. Marine As of 10:07 pm pdt Wednesday... Wind flow in the near term is from the south from the monterey bay southward along the big sur coast and variable to northwest over the remainder of the coastal waters. Gusty west winds developing over the san francisco bay to the delta Thursday afternoon and evening. Light long period southerly swell will continue into Thursday. Mtr watches warnings advisories Tngt Sca... Pt arena to pigeon pt 10-60 nm sca... Pt arena to pt reyes 0-10 nm sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am public forecast: mm 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 Redwood City, CA
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | |
| Last 24hr | W G8 | SE | N | S | NW | -- | SW | SE | NE G4 | E | NE | N | NW G9 | N G13 | NW | NW | NW | W | W G15 | N | NW | N | N | NW |
| 1 day ago | NW | SW | -- | S | S | SW | -- | SE | E | N | N | N G7 | NW | W G13 | W G17 | W G24 | W G18 | SW G21 | W G18 | SW | W G12 | NW | W G17 | W G10 |
| 2 days ago | W | W | E | E | N | N | NW | W G16 | W G22 | W G22 | W G20 | W G19 | W G21 | W G16 | SW G12 | SW | W G10 | W | NW |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Half Moon Bay Airport, CA | 1 mi | 64 min | SE 9 | 4.00 mi | Fog/Mist | 57°F | 55°F | 94% | 1014.6 hPa |
| San Francisco, San Francisco International Airport, CA | 10 mi | 63 min | WNW 8 | 10.00 mi | A Few Clouds | 62°F | 53°F | 73% | 1012.8 hPa |
| Oakland, Metro Oakland International Airport, CA | 20 mi | 66 min | NNW 5 | 10.00 mi | A Few Clouds | 62°F | 55°F | 78% | 1013.2 hPa |
| Hayward, Hayward Air Terminal, CA | 22 mi | 65 min | NNW 5 | 10.00 mi | Fair | 61°F | 55°F | 81% | 1013.7 hPa |
| Mountain View, Moffett Field, CA | 23 mi | 2 hrs | N 5 | 10.00 mi | Fair | 66°F | 59°F | 78% | 1013.1 hPa |
Wind History from SFO (wind in knots)
| 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 | 12 AM | 1 AM | |
| Last 24hr | W | SW | SW | Calm | Calm | Calm | Calm | E | NE | NE | NE | N | NW | NW | NW | W | NW | W | NW | W | NW | NW | W | W |
| 1 day ago | W | NW | NW | NW | NW | W | NW | NW | NW | NW | NW G18 | W G25 | W G29 | W G35 | W G31 | W G28 | W G30 | W G36 | W G27 | W G27 | W G20 | W G21 | W G18 | SW G17 |
| 2 days ago | W | W | NW | NW | W | W | W | NW | NW | NW | W | W | W G30 | W G41 | W G38 | W G39 | W G35 | W G36 | W G36 | W G35 | G19 | W G21 | W | W |
Tide / Current Tables for Princeton, Half Moon Bay, California
EDIT Weekend mode (on/off) (on/off) Help One Week of DataTide / Current data from XTide NOT FOR NAVIGATION
Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
EDIT (on/off) Help One Week of DataSan Mateo Bridge
Click for Map
Thu -- 02:29 AM PDT -0.01 knots Slack
Thu -- 06:01 AM PDT Sunrise
Thu -- 06:05 AM PDT -1.92 knots Max Ebb
Thu -- 07:35 AM PDT Moonset
Thu -- 09:36 AM PDT 0.01 knots Slack
Thu -- 12:29 PM PDT 1.86 knots Max Flood
Thu -- 04:05 PM PDT -0.01 knots Slack
Thu -- 06:39 PM PDT -0.92 knots Max Ebb
Thu -- 08:28 PM PDT Sunset
Thu -- 09:27 PM PDT 0.00 knots Slack
Thu -- 09:58 PM PDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Thu -- 02:29 AM PDT -0.01 knots Slack
Thu -- 06:01 AM PDT Sunrise
Thu -- 06:05 AM PDT -1.92 knots Max Ebb
Thu -- 07:35 AM PDT Moonset
Thu -- 09:36 AM PDT 0.01 knots Slack
Thu -- 12:29 PM PDT 1.86 knots Max Flood
Thu -- 04:05 PM PDT -0.01 knots Slack
Thu -- 06:39 PM PDT -0.92 knots Max Ebb
Thu -- 08:28 PM PDT Sunset
Thu -- 09:27 PM PDT 0.00 knots Slack
Thu -- 09:58 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 |
| 1.3 | 0.9 | 0.4 | -0.4 | -1.1 | -1.7 | -1.9 | -1.7 | -1.2 | -0.5 | 0.4 | 1.3 | 1.8 | 1.8 | 1.5 | 0.9 | 0.1 | -0.5 | -0.9 | -0.9 | -0.6 | -0.2 | 0.4 | 1 |
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 (4,6,7,8)
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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. |