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Marine Weather and Tides
Version 3.4 |
10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 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 7:19AM | Sunset 6:30PM | Friday October 18, 2019 5:10 PM PDT (00:10 UTC) | Moonrise 8:55PM | Moonset 10:56AM | Illumination 72% |  |
PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 229 Pm Pdt Fri Oct 18 2019
.small craft advisory for rough bar in effect through late tonight...
.small craft advisory in effect through late tonight...
Rest of today..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 9 to 11 ft at 15 seconds and sw around 2 ft at 13 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 4 to 5 ft. W swell 9 to 11 ft at 15 seconds.
Sat..NW winds 5 to 15 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 16 seconds.
Sat night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 15 seconds.
Sun..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 6 to 8 ft at 14 seconds and sw around 2 ft at 20 seconds.
Sun night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 5 to 7 ft at 13 seconds and sw around 2 ft at 19 seconds.
Mon..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 4 to 6 ft and sw around 2 ft.
Tue..NW winds 10 to 20 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 9 to 11 ft with a dominant period of 15 seconds. Across the bar...seas 10 to 13 ft with a dominant period of 15 seconds. Maximum ebb current of 3.6 kt at 07:31 pm Friday and 0.9 kt at 09:13 am Saturday.
.small craft advisory for rough bar in effect through late tonight...
.small craft advisory in effect through late tonight...
Rest of today..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 9 to 11 ft at 15 seconds and sw around 2 ft at 13 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 4 to 5 ft. W swell 9 to 11 ft at 15 seconds.
Sat..NW winds 5 to 15 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 16 seconds.
Sat night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 15 seconds.
Sun..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 6 to 8 ft at 14 seconds and sw around 2 ft at 20 seconds.
Sun night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 5 to 7 ft at 13 seconds and sw around 2 ft at 19 seconds.
Mon..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 4 to 6 ft and sw around 2 ft.
Tue..NW winds 10 to 20 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 9 to 11 ft with a dominant period of 15 seconds. Across the bar...seas 10 to 13 ft with a dominant period of 15 seconds. Maximum ebb current of 3.6 kt at 07:31 pm Friday and 0.9 kt at 09:13 am Saturday.
PZZ500 229 Pm Pdt Fri Oct 18 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Predominately light to locally moderate northwest winds the rest of today and through the weekend. The strongest winds will be concentrated along the big sur coast. The northwest swell will peak today and then begin to subside this evening with hazardous seas for smaller vessels continuing into this weekend.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Predominately light to locally moderate northwest winds the rest of today and through the weekend. The strongest winds will be concentrated along the big sur coast. The northwest swell will peak today and then begin to subside this evening with hazardous seas for smaller vessels continuing into this weekend.
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 182217 afdmtr area forecast discussion national weather service san francisco bay area 317 pm pdt Fri oct 18 2019 Synopsis Today will be another cool day for the bay area before another weak front moves through late this evening. Winds will be breezy as the front passes and there is a slight chance of rain with minimal accumulations for the north bay late tonight into Saturday morning. Temperatures will gradually warm over the weekend before a more robust warming trend early next week along with offshore flow. Discussion As of 1:39 pm pdt Friday... Under partly cloudy skies, afternoon temperatures are running similar to those from 24 hours ago with readings in the mid 60s to the lower 70s. Satellite imagery shows high clouds moving across the bay area southward, as well as some cumulus forming over higher peaks, and coastal stratus from marin county south to the monterey peninsula. Tonight a weak frontal boundary is forecast to bring rain chances to mainly the north bay overnight and into Saturday morning. Only a few hundredths of an inch at most can be expected, and mainly in the extreme northern portions of sonoma and napa counties. In addition, the passing boundary could result in an increase in offshore flow across the santa lucia mountains. These winds are not forecast to be overly strong, but with low humidity it raises the concerns for a fire threat (see fire discussion below). Onshore flow will persist Saturday and Sunday under a strong northwest flow. 500 mb heights will slowly rise for gradually warming temps over the weekend. By Monday, the upper level ridge will continue to grow and shift eastward towards the coast, initiating a much more substantial warming trend expected to last through the middle of the week. High temps should level off by Wednesday. However, while temperatures warm into the mid to upper 80s at the surface, the wind pattern shifts by Tuesday to a more widespread, offshore pattern, increasing the potential for possible fire weather issues through Thursday. Aviation As of 10:55 am pdt Friday... For 18z tafs. Previous model runs underestimated development of low clouds in moist lower levels but latest WRF core models show low level moisture clouds lingering through the morning most of the afternoon across the region today, in addition to the high clouds. Some brief improvements possible later today however deepening low level moisture may bring borderline ifr MVFR CIGS overnight, but showing improvement by Saturday morning. Breezy to occasionally gusty onshore winds today, however, noticeably weaker than yesterday. Low to moderate confidence forecast given wildly different model output and air mass shift in progress. |
Vicinity of ksfo... Air mass boundary advecting in lower level moisture is producing stratocumulus at around 2500 to 3500 ft as of 1730z and will continue to do so through the day. Breezy onshore winds 13-16kt with gusts into the low 20kts possible today. Low confidence on ceilings from this evening through tomorrow morning given sufficient low level moisture to force at least few-sct low level clouds into sunrise Saturday. Sfo bridge approach... Similar to ksfo. Monterey bay terminals...VFR with some increasing high clouds into the early to mid afternoon. Then, models show increasing low level moisture that may early support arrival of low clouds as early as 00-01z for kmry ksns, as tafs reflect. Low clouds mix out by sunrise Saturday. Low confidence. Fire weather As of 3:05 pm pdt Friday... Two main fire weather concerns over the next seven days. The first impact will be focused tonight over the higher terrain of the santa lucia mountains. Hi-res WRF model continues to show a localized offshore flow scenario tonight with N to NE winds 25-35 mph with poor humidity recovery. The second impact will be focused on next week. High pressure is forecast to build starting Sunday Monday and continue through much of the next week with a warming and drying trend. More importantly, offshore flow is forecast to develop on Monday and increase each day before peaking Wednesday night Thursday morning. Latest GFS continues to show a robust 15mb+ sfo-wmc... That being said the ECMWF isn't as strong. None the less, this situation next week needs watching. Even if the strength of the wind doesn't verify rh will be low by night number three. Stay tuned... . Marine As of 10:48 am pdt Friday... Light to locally moderate northwest winds are forecast to prevail over the coastal waters through the day and into the weekend. The strongest winds will be concentrated along the big sur coast. The northwest swell will peak today and then begin to subside this evening with hazardous seas for smaller vessels continuing into Saturday. Mtr watches warnings advisories Tngt High surf advisory... Caz006-505-509-529-530 sca... Pigeon pt to pt pinos 0-10 nm sca... Pt arena to pt reyes 0-10 nm sca... Pt pinos to pt piedras blancas 0-10 nm sca... Pt arena to pigeon pt 10-60 nm sca... Pigeon pt to pt piedras blancas 10-60 nm sca... Pt reyes to pigeon pt 0-10 nm until 3 am sca... Rough bar advisory for sf bar until 3 am public forecast: sims aviation: drp marine: drp fire weather: mm 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| 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 | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | |
| Last 24hr | W G19 | W G17 | W G14 | SW G8 | W G11 | W G10 | SW G9 | S | SW | SW | S | S | S | SW | SW | SE | SW G10 | W | SW G11 | SW G11 | SW G15 | W G11 | SW G11 | SW G14 |
| 1 day ago | W G12 | SW G11 | SW G9 | SW G9 | S G7 | SW G8 | -- | SW G7 | SW G8 | S | SW | SW G7 | SW G8 | SW G10 | SW G9 | SW G11 | SW G11 | W G10 | W G16 | W G18 | W G17 | W G20 | W G21 | |
| 2 days ago | W G17 | SW G19 | SW G20 | SW G11 | W G5 | W | SW | SW G8 | SW G7 | SW G6 | SW | S G4 | W | SW G8 | SW | SW | S | NW G6 | W | SW G10 | W G13 | SW G11 | SW G15 | W G13 |
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 | 14 min | W 18 | 10.00 mi | A Few Clouds and Breezy | 63°F | 48°F | 58% | 1017.9 hPa |
| Half Moon Bay Airport, CA | 21 mi | 15 min | NW 8 | 4.00 mi | Fair with Haze | 59°F | 55°F | 88% | 1019 hPa |
| Oakland, Metro Oakland International Airport, CA | 24 mi | 17 min | W 17 | 10.00 mi | A Few Clouds | 65°F | 48°F | 56% | 1017.8 hPa |
Link to 5 minute data for KSFO
Wind History from SFO (wind in knots)
| 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 | W G31 | W G30 | W | W | W | W | W | W | W | W | W | W | W | W | NW | NW | NW | W G15 | W | W | W | W | W | W |
| 1 day ago | W | NW | N | NW | W | W | NW | W | W | W | Calm | W | W | W | W | W G23 | W | W | W | W | W G27 | W G33 | W G34 | W G36 |
| 2 days ago | W | W | W | W | W | W | W | W | W | W | W | W | W | W | NW | W | W | W | W | W | NW | W | W | W |
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
Fri -- 03:17 AM PDT 4.16 feet High Tide
Fri -- 07:21 AM PDT Sunrise
Fri -- 07:55 AM PDT 2.88 feet Low Tide
Fri -- 11:56 AM PDT Moonset
Fri -- 02:03 PM PDT 5.34 feet High Tide
Fri -- 06:29 PM PDT Sunset
Fri -- 08:54 PM PDT 0.12 feet Low Tide
Fri -- 09:54 PM PDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 03:17 AM PDT 4.16 feet High Tide
Fri -- 07:21 AM PDT Sunrise
Fri -- 07:55 AM PDT 2.88 feet Low Tide
Fri -- 11:56 AM PDT Moonset
Fri -- 02:03 PM PDT 5.34 feet High Tide
Fri -- 06:29 PM PDT Sunset
Fri -- 08:54 PM PDT 0.12 feet Low Tide
Fri -- 09:54 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 |
| 2.6 | 3.3 | 3.9 | 4.1 | 4.1 | 3.8 | 3.3 | 3 | 2.9 | 3.1 | 3.5 | 4.1 | 4.7 | 5.1 | 5.3 | 5.1 | 4.5 | 3.4 | 2.2 | 1.1 | 0.3 | 0.1 | 0.4 | 1 |
Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
EDIT (on/off) Help One Week of DataSouth Channel
Click for Map
Fri -- 12:38 AM PDT 1.22 knots Max Flood
Fri -- 04:32 AM PDT -0.00 knots Slack
Fri -- 06:44 AM PDT -0.89 knots Max Ebb
Fri -- 07:21 AM PDT Sunrise
Fri -- 09:18 AM PDT 0.00 knots Slack
Fri -- 11:55 AM PDT Moonset
Fri -- 12:26 PM PDT 0.81 knots Max Flood
Fri -- 03:24 PM PDT -0.01 knots Slack
Fri -- 06:28 PM PDT Sunset
Fri -- 06:57 PM PDT -1.65 knots Max Ebb
Fri -- 09:54 PM PDT Moonrise
Fri -- 10:23 PM PDT 0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 12:38 AM PDT 1.22 knots Max Flood
Fri -- 04:32 AM PDT -0.00 knots Slack
Fri -- 06:44 AM PDT -0.89 knots Max Ebb
Fri -- 07:21 AM PDT Sunrise
Fri -- 09:18 AM PDT 0.00 knots Slack
Fri -- 11:55 AM PDT Moonset
Fri -- 12:26 PM PDT 0.81 knots Max Flood
Fri -- 03:24 PM PDT -0.01 knots Slack
Fri -- 06:28 PM PDT Sunset
Fri -- 06:57 PM PDT -1.65 knots Max Ebb
Fri -- 09:54 PM PDT Moonrise
Fri -- 10:23 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 | 1.2 | 1 | 0.7 | 0.3 | -0.3 | -0.8 | -0.9 | -0.6 | -0.1 | 0.2 | 0.6 | 0.8 | 0.8 | 0.5 | 0.2 | -0.3 | -0.9 | -1.4 | -1.7 | -1.4 | -0.8 | -0.2 | 0.3 |
Weather Map
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GEOS 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 (20,4,5,8)
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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. |