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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 6:30AM | Sunset 7:55PM | Thursday August 22, 2019 11:23 PM PDT (06:23 UTC) | Moonrise 10:55PM | Moonset 12:07PM | Illumination 48% |  |
PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 917 Pm Pdt Thu Aug 22 2019
.small craft advisory in effect until 3 am pdt Friday...
Tonight..NW winds 15 to 20 kt. W swell 8 to 10 ft at 9 seconds, decreasing to 6 to 8 ft at 9 seconds after midnight. SWell sw around 2 ft.
Fri..S winds 10 to 15 kt. W swell 5 to 7 ft at 10 seconds and sw around 2 ft at 18 seconds.
Fri night..S winds 5 to 10 kt. W swell 4 to 6 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat..S winds 5 to 10 kt. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat night..NW winds around 5 kt. Wind waves 2 to 3 ft. W swell 2 to 3 ft at 13 seconds and sw around 2 ft at 15 seconds.
Sun..W winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell 2 to 4 ft at 12 seconds and sw around 2 ft at 15 seconds. Patchy fog.
Sun night..NW winds around 5 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft at 12 seconds and sw around 2 ft at 15 seconds. Patchy fog.
Mon..SW winds 5 to 10 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft and sw around 2 ft. Patchy fog.
Tue..S winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell 2 to 4 ft and sw around 2 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 5 ft with a dominant period of 8 seconds. Across the bar...seas 6 to 7 ft with a dominant period of 8 seconds. Maximum ebb current of 2.2 kt at 09:55 pm Thursday and 1.0 kt at 11:13 am Friday.
.small craft advisory in effect until 3 am pdt Friday...
Tonight..NW winds 15 to 20 kt. W swell 8 to 10 ft at 9 seconds, decreasing to 6 to 8 ft at 9 seconds after midnight. SWell sw around 2 ft.
Fri..S winds 10 to 15 kt. W swell 5 to 7 ft at 10 seconds and sw around 2 ft at 18 seconds.
Fri night..S winds 5 to 10 kt. W swell 4 to 6 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat..S winds 5 to 10 kt. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat night..NW winds around 5 kt. Wind waves 2 to 3 ft. W swell 2 to 3 ft at 13 seconds and sw around 2 ft at 15 seconds.
Sun..W winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell 2 to 4 ft at 12 seconds and sw around 2 ft at 15 seconds. Patchy fog.
Sun night..NW winds around 5 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft at 12 seconds and sw around 2 ft at 15 seconds. Patchy fog.
Mon..SW winds 5 to 10 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft and sw around 2 ft. Patchy fog.
Tue..S winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell 2 to 4 ft and sw around 2 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 5 ft with a dominant period of 8 seconds. Across the bar...seas 6 to 7 ft with a dominant period of 8 seconds. Maximum ebb current of 2.2 kt at 09:55 pm Thursday and 1.0 kt at 11:13 am Friday.
PZZ500 917 Pm Pdt Thu Aug 22 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds across the waters will generate a steep northwest swell hazardous to small craft vessels at 8 to 10 second periods tonight into Friday. A coastally trapped southerly wind reversal will also develop turning winds to a southwesterly direction along the coast late tonight through Friday. A decreasing northerly pressure gradient and winds Friday will ease aforementioned wind generated seas. Small, longer period swells will move through the coastal waters next week.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds across the waters will generate a steep northwest swell hazardous to small craft vessels at 8 to 10 second periods tonight into Friday. A coastally trapped southerly wind reversal will also develop turning winds to a southwesterly direction along the coast late tonight through Friday. A decreasing northerly pressure gradient and winds Friday will ease aforementioned wind generated seas. Small, longer period swells will move through the coastal waters next week.
7 Day Forecast for Marine Location Near Lagunitas-Forest Knolls CDP, CA
Hourly EDIT Helplocation: 37.98, -122.74 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 230440 afdmtr area forecast discussion national weather service san francisco bay area 940 pm pdt Thu aug 22 2019 Synopsis The warm temperatures today cool slightly on Friday across the bay area. However, high dew point temperatures tomorrow will keep inland areas feeling warmer. Temperatures will increase this weekend as high pressure builds over california lasting through the early work week. By midweek, moisture increases as the remnants of ivo traverses northward in the pacific ocean just off the california coast allowing muggy conditions to return. Discussion As of 9:40 pm pdt Thursday... Higher humidity values today, especially this morning, resulted in much warmer minimum temperatures, especially in higher terrain areas. This morning's lows ranged from the upper 50s to the lower 70s, which were as many as 10 to 15 degrees above yesterday's mins in some cases. High temperatures today were a mixed bag, with some warmer and some slightly cooler than yesterday's values. Today's highs ranged from the 60s to lower 70s at the immediate coast to the 80s and 90s most other locations. The warmest locations reached 100 degrees, bookending our cwa, at pope valley in northern napa county, as well as bradley in southern monterey county. Current observations indicate that dew point temperatures are cooler than last night at this time, thus, expect cooler minimum temperatures tonight. Latest satellite imagery shows scant stratus formation thus far, limited to along the coast from san mateo county south as well as through the monterey bay and starting to extend down the salinas valley. The marine layer depth is a little higher per the fort ord profiler, and onshore flow persists with 2.5 mb between sfo and sac, so expect the area of low clouds to expand farther inland overnight. Did a minor update to the temperature forecast for tomorrow, mainly to cool some temperatures somewhat to reflect a slightly stronger seabreeze by tomorrow afternoon. Previous discussion There are higher dewpoint temperatures today around the bay area, ranging from 61 in salinas to 69 in san jose giving a muggy feel to the day. The marine layer has been pseudo- constant around 1500 feet the last few hours and will remain fairly shallow overnight, though patchy fog may be possible in the early morning hours along the coast. Onshore flow strengthens slightly tomorrow, providing slightly cooler temperatures on Friday. Lingering higher dew point temperatures inland will keep temperatures feeling warmer for interior locations. High pressure builds over california this weekend which will drive a warming trend for temperatures. Temperatures will MAX out on Sunday in the mid to upper 90s, with isolated locations in southern san benito and monterey counties reaching the low 100s. However, those values are based on current models having the ridge axis of high pressure north of the bay area. If the ridge retrogrades slightly, temperatures around our area could increase even higher, thus will be monitored as the next round of models are produced. The warming trend looks to continue through the early part of the work week. By Wednesday, the remnants of the tropical system ivo will have moved northward in the pacific just west of the bay area. Ivo will bring an increase in moisture giving a better chance for clouds cover across the area and an overall muggy feeling. No precipitation or thunderstorms are currently forecast, though it will be something that will be closely monitored as the time interval draws closer. Aviation As of 6:22 pm pdt Thursday... An influx of drier air, an air flow with origins having more mid-latitude influence, has spread in on northwest coastal winds. Ifr ceilings due to coastal |
stratus and fog are presently limited to the san mateo coast and the southern half of the monterey bay area and the northern salinas valley south along the coast to point sur. Elsewhere it's vfr, and land based surface weather observations still show elevated dew point temperatures, a measure of water vapor, in the upper 50s to mid 60s. At present the latest WRF model boundary layer relative humidity is over-forecasting areal coverage of coastal stratus and fog. The marine layer remains compressed to 700 to 800 feet with inversion temperatures from 24c to 26c still plenty warm to keep the inversions intact through the period despite some near surface based cool air advection tonight and Friday. For this evening's volume, it's a moderate to high confidenceVFR forecast for the bay area terminals. Ifr will be confined to aforementioned locations for the evening, and still expecting ifr to spread inland tonight, however it'll be delayed somewhat until nighttime cooling and still favorable thermodynamics combine to produce increasing areal coverage of coastal stratus and fog. On Friday there should be sufficient diurnal mixing to lift ceilings to vfr at most, mainly inland, terminals, however in terms of areal coverage of stratus and fog it's a very low confidence forecast Friday into Saturday morning; a temporarily ramped up (4 mb) smx-sfo pressure gradient and wind juxtaposed to a diminishing (3 mb or less) acv-sfo pressure gradient and wind could cause any combination of coverage. Vicinity of ksfo...VFR, west wind 20 knots with occasional gusts to 30 knots until 04z this evening. The combination of a compressed marine layer and absence of stratus and fog upstream to the northwest supports a moderate to high confidenceVFR forecast for the evening. After this however it's a lowering confidence ifr ceiling forecast for tonight. The terminal and approach may just hold on toVFR for the overnight and Friday if the aforementioned smx-sfo pressure gradient develops (usually the NAM is slow with this forecast) under a compressed marine layer. Will monitor as we approach the 06z TAF issuance, a reduction in ifr forecast duration for Friday morning is possible. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... A solid coverage of stratus and fog exists over the southern monterey bay area and northern salinas valley. Lifr-ifr conditions forecast tonight with northwest winds ushering in some surface based cooling, a brief uptick in cooling and marine layer depth is most recently seen on the fort ord profiler, cooling then extends up to the 925 mb level Friday. Lifr-ifr Friday morning lifts toVFR by late morning. Marine As of 09:17 pm pdt Thursday... Northwest winds across the waters will generate a steep northwest swell hazardous to small craft vessels at 8 to 10 second periods tonight into Friday. A coastally trapped southerly wind reversal will also develop turning winds to a southwesterly direction along the coast late tonight through Friday. A decreasing northerly pressure gradient and winds Friday will ease aforementioned wind generated seas. Small, longer period swells will move through the coastal waters next week. Mtr watches warnings advisories Tngt Sca... Pt arena to pigeon pt 10-60 nm sca... Pt reyes to pigeon pt 0-10 nm until 3 am sca... Pt pinos to pt piedras blancas 0-10 nm until 3 am sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am sca... Pt arena to pt reyes 0-10 nm public forecast: sims aviation: canepa 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 Point Reyes, CA
(wind in knots) EDIT (on/off) Help| Last 24hr | ||||||||||||||||||||||||
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| 2 days ago |
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 |
| Novato / Gnoss Field, CA | 15 mi | 3.5 hrs | E 6 | 10.00 mi | Fair | 77°F | 59°F | 54% | 1005.8 hPa |
| Petaluma Municipal Airport, CA | 20 mi | 4.5 hrs | Var 5 | 8.00 mi | Fair | 79°F | 59°F | 51% | 1006.1 hPa |
Link to 5 minute data for KDVO
Wind History from DVO (wind in knots)
| 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 | |
| Last 24hr | S | NE | E | E | SE | Calm | Calm | Calm | Calm | Calm | Calm | Calm | SE | G10 | SW | SW | SW | SW | NE | SE | Calm | N | ||
| 1 day ago | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | N | SW | W G14 | SW | W G18 | SW | E G11 | S | G14 | SE G13 | SE | ||
| 2 days ago | Calm | Calm | Calm | Calm | Calm | Calm | SW | NW | N | Calm | SW G16 | SW G15 | SW | SW | SW | SW G18 | SW G18 | SW | Calm | E | NE | N |
Tide / Current Tables for Bolinas Lagoon, California
EDIT Weekend mode (on/off) (on/off) Help One Week of DataBolinas Lagoon
Click for Map
Fri -- 12:19 AM PDT 0.89 feet Low Tide
Fri -- 06:11 AM PDT 2.66 feet High Tide
Fri -- 06:32 AM PDT Sunrise
Fri -- 07:58 AM PDT Last Quarter
Fri -- 11:48 AM PDT 1.60 feet Low Tide
Fri -- 02:07 PM PDT Moonset
Fri -- 05:39 PM PDT 3.89 feet High Tide
Fri -- 07:53 PM PDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 12:19 AM PDT 0.89 feet Low Tide
Fri -- 06:11 AM PDT 2.66 feet High Tide
Fri -- 06:32 AM PDT Sunrise
Fri -- 07:58 AM PDT Last Quarter
Fri -- 11:48 AM PDT 1.60 feet Low Tide
Fri -- 02:07 PM PDT Moonset
Fri -- 05:39 PM PDT 3.89 feet High Tide
Fri -- 07:53 PM PDT Sunset
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 | 1 | 1.3 | 1.7 | 2.2 | 2.5 | 2.7 | 2.6 | 2.4 | 2.1 | 1.9 | 1.7 | 1.6 | 1.8 | 2.2 | 2.8 | 3.4 | 3.8 | 3.9 | 3.7 | 3.2 | 2.6 | 1.9 | 1.3 |
Tide / Current Tables for Point Reyes, California Current
EDIT (on/off) Help One Week of DataPoint Reyes
Click for Map
Fri -- 12:45 AM PDT 0.00 knots Slack
Fri -- 03:32 AM PDT 0.60 knots Max Flood
Fri -- 06:34 AM PDT Sunrise
Fri -- 06:52 AM PDT -0.00 knots Slack
Fri -- 07:58 AM PDT Last Quarter
Fri -- 09:14 AM PDT -0.56 knots Max Ebb
Fri -- 12:09 PM PDT 0.00 knots Slack
Fri -- 02:09 PM PDT Moonset
Fri -- 03:28 PM PDT 0.57 knots Max Flood
Fri -- 06:21 PM PDT -0.00 knots Slack
Fri -- 07:54 PM PDT Sunset
Fri -- 09:45 PM PDT -1.02 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 12:45 AM PDT 0.00 knots Slack
Fri -- 03:32 AM PDT 0.60 knots Max Flood
Fri -- 06:34 AM PDT Sunrise
Fri -- 06:52 AM PDT -0.00 knots Slack
Fri -- 07:58 AM PDT Last Quarter
Fri -- 09:14 AM PDT -0.56 knots Max Ebb
Fri -- 12:09 PM PDT 0.00 knots Slack
Fri -- 02:09 PM PDT Moonset
Fri -- 03:28 PM PDT 0.57 knots Max Flood
Fri -- 06:21 PM PDT -0.00 knots Slack
Fri -- 07:54 PM PDT Sunset
Fri -- 09:45 PM PDT -1.02 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 |
| -0.2 | 0.1 | 0.4 | 0.6 | 0.6 | 0.4 | 0.2 | -0 | -0.4 | -0.6 | -0.5 | -0.3 | -0 | 0.2 | 0.4 | 0.5 | 0.5 | 0.4 | 0.1 | -0.2 | -0.6 | -0.9 | -1 | -0.8 |
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 (2,6,7,8)
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Ground Weather Radar Station Sacramento, 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. |