Marine Weather and Tides
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 7:01AM||Sunset 7:00PM||Tuesday September 26, 2017 10:57 AM PDT (17:57 UTC)||Moonrise 12:04PM||Moonset 10:22PM||Illumination 35%|
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|PZZ545 Point Reyes To Pigeon Point To 10 Nm- 826 Am Pdt Tue Sep 26 2017 |
Today..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 2 to 4 ft at 9 seconds.
Wed..E winds 5 to 15 kt...becoming sw in the afternoon. Wind waves 3 to 5 ft. NW swell 3 to 5 ft at 10 seconds.
Wed night..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds.
Thu..NW winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 3 ft at 10 seconds.
Fri..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 2 to 4 ft.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 to 5 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 2 to 4 ft with a dominant swell period 8 seconds. Across the bar...combined seas 3 to 5 ft with a dominant swell period of 8 seconds. Maximum ebb current of 1.3 knots at 08:06 pm Tuesday and 0.5 knots at 08:48 am Wednesday.
|PZZ500 826 Am Pdt Tue Sep 26 2017 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwesterly winds will continue into this afternoon over the northern outer waters. A thermal trough over california will shift towards the coast this afternoon decreasing winds across coastal the waters. Expect winds to pick up again heading into the weekend as an upper level trough approaches the pacific northwest Friday.
7 Day Forecast for Marine Location Near El Granada, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 261728|
area forecast discussion
national weather service san francisco bay area
1028 am pdt Tue sep 26 2017
Synopsis Breezy in the hills this morning then turning sunny
and warm to hot again by midday. Another shot of gusty winds again
this evening for the north bay and east bay hills. Continued warm
and dry on Wednesday which may be the hottest day this week but
with winds easing. Onshore flow gradually returns by Thursday with
a few degrees of cooling followed by more noted cooling Friday
and Saturday as a trough passes to our north. Dry high pressure
rebuilds Sunday into next week.
Discussion As of 08:29 am pdt Tuesday... Modest warming trend
will continue over the region today with temperatures running a
few to as much as 7 degrees warmer (at santa rosa airport) than to
24 hours ago. With this, look for coastal locations to warm into
the upper 70s to lower 80s with mid 80s possible around santa
cruz. Inland areas and locations around the san francisco bay will
see afternoon temperatures in the upper 80s to near 90 while
inland areas warm into the mid upper 80s to lower 90s in the north
bay and east bay. Overall, the very warm temperatures will be
mostly uniform through this heat event. Have made a few minor
changes to the forecast this morning, mainly nudging up
temperatures for today and tomorrow as the MOS guidance output is
favored for most locations. Otherwise, clear skies will prevail
region-wide through at least midweek before onshore flow returns
late in the week brining slightly cooler temperatures back inland.
For additional details, please see the previous forecast
Prev discussion As of 3:37 am pdt Tuesday... Skies remain mostly
clear this morning with mild overnight lows around 60 most areas.
Surface gradients currently show a 6 mb pressure gradient down the
coast form arcata to sfo which is a dry northerly flow. The large
scale offshore from the deserts is around 7-8 mb which is only
moderate. This is translating to some gusty winds in the north and
east bay hills with hawkeye in northern sonoma currently gusting
28 mph with 19 mph on mt tamalpais. This all sets the stage for
rapid warming again today as the Sun comes up and the dry airmass
quickly warms up under adiabatic compression off the coastal
hills. The official forecast for today has widespread 80s and 90s
across the bay area.
Models show another shot of east northeast winds in the hills this
evening which will keep fire weather concerns in place due to poor
humidity recovery, mild temps and continued dry offshore winds.
Winds will finally ease on Wednesday but another warm to hot day
is forecast across the region.
Some coastal cooling should become obvious by Thursday as onshore
flow gradually returns to area but inland areas will remain above
normal once again.|
The ECMWF nows brings a dry cold front over the bay area by
Friday. This should induce some gusty onshore winds and a possible
return of the marine layer into Saturday. The pattern looks
progressive with high pressure rebuilding by Sunday into early
next week with another thermal trough setting up at the surface.
This should translate too another round of sunny and mild days for
early next week before the next trough knocks temps back down a
Aviation As of 10:30 am pdt Tuesday... For 18z tafs. Another
clear day with prevailingVFR conditions expected through the
period. Generally light offshore flow expected this morning before
winds turn westerly this afternoon to around 10 kt.
Vicinity of ksfo...VFR. Generally light winds. Afternoon
westerlies 10-15 kt.
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals...VFR prevailing with clear skies through
Fire weather As of 3:37 am pdt Tuesday... Red flag warnings
remain in place for the north and east bay hills into weds.
Humidity remains below 30 percent early this morning with dry
north winds showing up in the hills. Winds forecast to ease
through the daytime hours today but another warm and dry day.
Models show another shot of gusty east northeast winds by this
evening and overnight, strongest in the napa hills. Latest fuels
analysis shows that fuels are around normal in terms of seasonable
dryness but of course this is the driest time of year. However
trend of warmer and drier will continue to dry out the fine and
live fuels. Winds will finally ease on Wednesday but that may be
the hottest and driest day this week. Will need to watch for
return of onshore winds Thursday afternoon for the interior
valleys. Breezy onshore winds Friday and Saturday then warming and
drying again Sunday into early next week.
Marine As of 08:29 am pdt Tuesday... Moderate northwesterly
winds will continue into this afternoon over the northern outer
waters. A thermal trough over california will shift towards the
coast this afternoon decreasing winds across coastal the waters.
Expect winds to pick up again heading into the weekend as an
upper level trough approaches the pacific northwest Friday.
Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm until 3 pm
public forecast: rgass rww
fire weather: rww
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Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Wind History for Redwood City, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Half Moon Bay Airport, CA||1 mi||62 min||SSE 4||7.00 mi||Fair||68°F||0°F||%||1010.2 hPa|
|San Francisco, San Francisco International Airport, CA||10 mi||61 min||N 0||10.00 mi||A Few Clouds||69°F||55°F||61%||1011.1 hPa|
|San Carlos Airport, CA||12 mi||70 min||N 0||10.00 mi||Fair||68°F||57°F||69%||1011.5 hPa|
|Palo Alto Airport, CA||19 mi||70 min||N 0||10.00 mi||Clear||68°F||59°F||73%||1011.5 hPa|
|Oakland, Metro Oakland International Airport, CA||20 mi||64 min||SW 4||10.00 mi||A Few Clouds||67°F||55°F||66%||1011.3 hPa|
|Hayward, Hayward Air Terminal, CA||22 mi||63 min||S 7||10.00 mi||Fair||74°F||41°F||31%||1012 hPa|
|Mountain View, Moffett Field, CA||23 mi||61 min||NW 3||10.00 mi||Fair||73°F||55°F||53%||1011.7 hPa|
Wind History from SFO (wind in knots)
|1 day ago||NE||N||NE||E||W||W||W|
|2 days ago||N||NE||W||W||W||W||W||W||W||NW||W||W||Calm||W||W||SW||S||W||SW||Calm||Calm||S||NE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Tue -- 04:11 AM PDT 3.90 feet High Tide
Tue -- 07:01 AM PDT Sunrise
Tue -- 09:27 AM PDT 2.89 feet Low Tide
Tue -- 01:04 PM PDT Moonrise
Tue -- 03:12 PM PDT 4.81 feet High Tide
Tue -- 07:00 PM PDT Sunset
Tue -- 10:20 PM PDT 0.96 feet Low Tide
Tue -- 11:22 PM PDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|San Mateo Bridge |
Click for Map
Tue -- 12:29 AM PDT 0.00 knots Slack
Tue -- 03:13 AM PDT 1.26 knots Max Flood
Tue -- 06:56 AM PDT -0.01 knots Slack
Tue -- 07:00 AM PDT Sunrise
Tue -- 09:28 AM PDT -0.77 knots Max Ebb
Tue -- 12:32 PM PDT 0.00 knots Slack
Tue -- 01:03 PM PDT Moonrise
Tue -- 03:05 PM PDT 0.86 knots Max Flood
Tue -- 06:13 PM PDT -0.00 knots Slack
Tue -- 06:59 PM PDT Sunset
Tue -- 09:46 PM PDT -1.32 knots Max Ebb
Tue -- 11:21 PM PDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of CentralWestCoast EDIT
Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)(on/off)  Help
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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.