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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 7:26AM | Sunset 6:21PM | Monday October 23, 2017 6:58 PM PDT (01:58 UTC) | Moonrise 9:58AM | Moonset 8:15PM | Illumination 15% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 220 Pm Pdt Mon Oct 23 2017 Tonight..NE winds 10 kt. Tue..NE winds 5 to 15 kt. Tue night..W winds 10 kt. Wed..NE winds 10 kt. Wed night..SW winds 5 to 15 kt. Thu..NE winds 10 kt...becoming nw. Fri..NE winds 5 kt...becoming w. Sat..N winds 5 kt...becoming sw. | PZZ500 220 Pm Pdt Mon Oct 23 2017 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light northwesterly winds will prevail over the coastal waters this afternoon and overnight with locally breezy conditions possible in the outer waters north of point reyes. Additionally, the northwest swell will decrease through the middle of the week, but then increase again late week as another long-period swell arrives. |
7 Day Forecast for Marine Location Near Novato, CA
Hourly EDIT Helplocation: 38.1, -122.59 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 240001 afdmtr area forecast discussion national weather service san francisco bay area 501 pm pdt Mon oct 23 2017 Synopsis A rapid warming trend that got underway today will persist into Tuesday with the potential for record to near record breaking daytime temperatures. Temperatures cool slightly as offshore flow and the high pressure aloft weakens by midweek, yet temperatures look to remain above seasonal averages through late week. In addition, ongoing dry conditions will likely persist through the end of the month. Discussion As of 01:45 pm pdt Monday... A strong ridge of high pressure building in from the south and west has resulted very warm to hot conditions across the region. Afternoon temperatures are forecast to be around 15 to 20 deg f above seasonal averages and will likely warm by a few more degrees on Tuesday as weak offshore flow persists. With this type of late season heat event, temperatures will be evenly spread from near the coast in the 80s to 90s inland this afternoon. The warmest and driest air mass appears to remain placed over southern california and up into the central coast where afternoon temperatures will potentially reach into the middle upper 90s on Tuesday afternoon. Cannot even rule out lower 90s in and around the monterey area as well as santa cruz. These warm temperatures may reach or exceed current record values for the calendar date, both today and on Tuesday. The heat will result in concerns for our more heat sensitive populations such as the elderly, young and homeless with heat risk levels reaching into the low to moderate category, especially across the central coast. However, long october nights and clear skies will allow for sufficient overnight cooling with lows generally in the 50s for most urban areas while higher elevations only cool into the 60s and lower 70s. By midweek, a slight cooling trend is likely as the mid upper level ridge retreats back out over the pacific in response to trough digging into the great basin and central plains. While onshore flow returns at the coast, weak offshore flow will persist inland to help maintain temperatures that are above seasonal averages at least on Wednesday and Thursday. |
Stronger onshore flow is then anticipated late in the week into early next week which will help cool inland areas as well. However, look for values to remain on the warm side of normal through early next week. Will have to watch for the return of overnight early morning coastal clouds late in the week as the boundary layer moistens up. Otherwise, ongoing dry weather conditions are likely to persist through the end of the month. Aviation As of 5:00 pm pdt Monday...VFR through the entire period for all tafs due to an offshore flow in place. Winds will generally be under 12 kt. High confidence. Vicinity of ksfo...VFR through the period. Winds forecast to be under 10 kt. High confidence. Sfo bridge approach... Similar to ksfo. Monterey bay terminals...VFR through the period. Stronger winds near ksns with speeds over 10 kt possible starting after 12z. High confidence. Fire weather As of 5:00 pm pdt Monday... Winds are anticipated to decrease later this afternoon and evening for the north bay and east bay hills. Otherwise, generally light offshore wind will continue for all other zones through tomorrow. Another hot and dry day tomorrow, with single digit humidity values possible for parts of monterey and san benito counties. Humidity values increase by Wednesday. With cooler conditions slated for our entire region by Thursday. Marine As of 08:54 am pdt Monday... Northwest winds will continue to gradually diminish through the day. Additionally, the northwest swell will decrease through the middle of the week, but then increase again late week as another long-period swell arrives. Mtr watches warnings advisories Tday Sca... Pt arena to pigeon pt 10-60 nm public forecast: rgass aviation: bell marine: rowe fire weather: bam visit us at |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for Richmond, CA
(wind in knots) EDIT (on/off) Help| 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 | NW | -- | -- | NW | W | W | SW | NW | NW | NW | NW | NW | W | NW | NW | NW | NW | NW | E G9 | NE | E G7 | NW | NW | NW |
| 1 day ago | NW G12 | NW | NW G11 | N | NE | E | S | SE | SE | S | W | NW | E | N | N | NW | N | N G11 | N G9 | N | NE | S | S | NW |
| 2 days ago | NW G11 | NW G11 | NW G17 | NW | NW G11 | NW G10 | N | N | NW | -- | NE | N | NW | NW | N | N | W | NW | S | S | S | S | S | SE |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Novato / Gnoss Field, CA | 4 mi | 83 min | SSE 5 | 10.00 mi | Fair | 81°F | 51°F | 37% | 1021 hPa |
| Petaluma Municipal Airport, CA | 11 mi | 83 min | Var 4 | 10.00 mi | Fair | 81°F | 55°F | 42% | 1021 hPa |
| Napa, Napa County Airport, CA | 18 mi | 64 min | SSW 3 | 10.00 mi | Fair | 75°F | 57°F | 54% | 1019.8 hPa |
Wind History from DVO (wind in knots)
| 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | -12 PM | 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 | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | S | S | SE | SE | S | SE | SE | Calm | ||
| 1 day ago | Calm | NW G14 | NW | SE | SE | E | Calm | Calm | Calm | Calm | Calm | S | Calm | Calm | Calm | Calm | N | N | Calm | N | NW | Calm | ||
| 2 days ago | W | W G19 | W | N | G11 | N | E | Calm | Calm | Calm | Calm | Calm | N | Calm | Calm | N | N | NW G15 | W G16 | NW G16 | W | W | SW G16 |
Tide / Current Tables for Hog Island, San Antonio Creek, San Pablo Bay, California
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Hog Island Click for Map Mon -- 04:51 AM PDT 4.91 feet High Tide Mon -- 07:27 AM PDT Sunrise Mon -- 10:35 AM PDT 2.09 feet Low Tide Mon -- 10:57 AM PDT Moonrise Mon -- 03:48 PM PDT 5.82 feet High Tide Mon -- 06:21 PM PDT Sunset Mon -- 09:15 PM PDT Moonset Mon -- 11:16 PM PDT 0.16 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 0.8 | 1.8 | 2.9 | 4 | 4.7 | 4.9 | 4.6 | 4 | 3.3 | 2.6 | 2.2 | 2.2 | 2.7 | 3.7 | 4.7 | 5.6 | 5.8 | 5.5 | 4.8 | 3.7 | 2.5 | 1.3 | 0.5 | 0.2 |
Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
EDIT (on/off) Help One Week of Data| Petaluma River Approach Click for Map Mon -- 01:16 AM PDT 0.54 knots Max Flood Mon -- 04:47 AM PDT -0.00 knots Slack Mon -- 07:03 AM PDT -0.41 knots Max Ebb Mon -- 07:26 AM PDT Sunrise Mon -- 09:46 AM PDT 0.00 knots Slack Mon -- 10:56 AM PDT Moonrise Mon -- 12:12 PM PDT 0.63 knots Max Flood Mon -- 03:31 PM PDT -0.00 knots Slack Mon -- 06:20 PM PDT Sunset Mon -- 06:51 PM PDT -0.82 knots Max Ebb Mon -- 09:15 PM PDT Moonset Mon -- 11:17 PM PDT 0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 0.4 | 0.5 | 0.5 | 0.4 | 0.2 | -0.1 | -0.3 | -0.4 | -0.4 | -0.2 | 0.1 | 0.4 | 0.6 | 0.6 | 0.4 | 0.1 | -0.2 | -0.5 | -0.8 | -0.8 | -0.8 | -0.6 | -0.4 | -0.1 |
Weather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of CentralWestCoast EDIT  |
Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
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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. |