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 7:13AM||Sunset 4:49PM||Friday December 15, 2017 7:27 PM PST (03:27 UTC)||Moonrise 4:44AM||Moonset 3:30PM||Illumination 5%|
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|PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 218 Pm Pst Fri Dec 15 2017 |
.small craft advisory in effect from Saturday morning through late Saturday night...
Rest of today..NW winds up to 10 kt.
Tonight..NW winds 5 to 15 kt.
Sat..N winds 20 to 30 kt with gusts up to 40 kt.
Sat night..N winds 15 to 25 kt with gusts up to 40 kt.
Sun..NE winds 10 to 20 kt with gusts up to 30 kt.
Sun night..E winds 5 to 10 kt.
Mon..NE winds 5 to 15 kt, diminishing to up to 10 kt.
Tue..NE winds around 5 kt, becoming sw.
|PZZ500 218 Pm Pst Fri Dec 15 2017 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A dry cold front will bring strong gusty north winds to the waters, particularly overnight tonight and into Saturday morning, with gusty north winds persisting through Sunday. Gale force winds are likely across all outer water zones beginning late tomorrow night through at least Sunday morning. The strong and gusty winds will create very steep wind waves and fresh swell, creating very rough and hazardous seas through the majority of the weekend.
7 Day Forecast for Marine Location Near Mountain House, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 160033|
area forecast discussion
national weather service san francisco bay area
433 pm pst Fri dec 15 2017
Breezy conditions likely late tonight through Sunday
Elevated fire danger particularly for higher
elevation locations for the same time...
Synopsis Dry weather will continue into next week. A mainly
dry cold front will sweep south over the area late Friday night
and early Saturday morning which then increases n-ne winds along
the ridges and peaks Saturday.
Discussion As of 2:00 pm pst Friday... Thanks to more clouds
today along with the ridge flattening out, we have seen a drop in
temperatures across the board -- generally 3 to 8 degrees
compared to Thursday. After multiple days of talking about it, we
are finally seeing a substantial pattern change as a system
approaches the west coast. Satellite clearly shows this feature
that is still expected to move through our region tonight. Still
have high confidence that any associated rainfall will be well to
The main story will be increasing winds overnight into Saturday as
the pressure gradient ramps up along with cold air advection. With
the overall flow expected to be north-to-south tomorrow, gusty
winds from the north will impact our area especially higher
elevation locations. The wind advisory remains in effect and
highlights local gusts exceeding 50 mph. Valley spots will
generally be 10 to 20 mph with higher gusts. Similar conditions
can be expected into early Sunday. Both the wind advisory and the
red flag warning remain in effect.
High pressure will attempt to rebuild later on Sunday and continue
on Monday before being replaced by another system that will drop
down Tuesday into Wednesday. Models have been having difficulty
with the track of this feature with most previous runs keeping it
too far to the east to bring rainfall into our cwa. However, 12z
run from both ECMWF and GFS are now trending wetter with it
positioned father to the west. In light of that, slight chance to
chance pops were added to the northern half of our region. Any
rainfall should be light -- most likely less than a tenth of an
After that point, we will enter a period of dry and cool weather
with a highly amplified ridge off the coast with a directly
northerly flow across california. No additional rainfall is
forecast at least through the 24th.
For those looking for some relief, the latest 3 and 4 week outlook
from the CPC does favor wetter than normal conditions. That would
be from december 30th to january 13.
Aviation As of 4:55 pm pst Friday... For 00z tafs. An
approaching dry cold front will move across the region late
tonight. Anticipate mainly high cloud and smoke to continue to
drift across the region ahead of the front. Light to moderate
northwesterly winds will strengthen and turn gusty overnight.
These strong and gusty northerly winds will persist through the
weekend. Sustained winds in the 15 to 25 kt range with gusts from
20 to 35 kt expected across area terminals. Strongest winds are
anticipated over ksfo after midnight tonight with sustained winds
near 30 kt and gusts to 40 kt possible. Winds over mountain ridges|
and through gaps will also be stronger than normal. High clouds
and smoke will continue to drift across the region
Vicinity of ksfo...VFR. Light northerly winds and high clouds will
prevail across the region this evening ahead of an approaching
cold front. Northwesterly winds will strengthen tonight with
fropa. Sustained winds in the 15 to 25 kt range with gusts from
25 to 35 kt expected. Strongest winds are anticipated over ksfo
after midnight tonight with sustained winds near 30 kt and gusts
to 40 kt possible. An airport weather warning for strong wind
gusts possible for early Saturday morning.
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals...VFR. Light to moderate west winds
expected through late this evening. Winds will strengthen and
become gusty overnight into Saturday morning as the front nears.
Sustained winds in the 10 to 15 kt range with gusts around 20 kt
Fire weather As of 2:42 am pst Friday... The fire weather watch
has been upgraded to a red flag warning from 10 pm Friday through
10 am Sunday. Offshore flow is forecast to develop behind the
front tonight into Saturday. Latest models do show some modest rh
recovery early tonight then dropping through the day and poor
recoveries Saturday night. It's fairly common to have lower rh on
night number two behind a front with developing offshore flow.
May not technically hit rh criteria for tonight, but decided to
keep fire weather concerns going given gusty winds, lack of recent rain,
very low rh (single digits) the last few nights and near record
values of ercs for the N bay mts and santa cruz diablo psas. Areas
of greatest concern will be above 1000 feet. Winds may be a tad
weaker on Saturday night, but rh recoveries worse. For what it's
worth, fire weather concerns are not that unusual for this time
of year. December 16, 2013, a wildfire broke out in big sur called
the pfeiffer fire.
Marine As of 03:57 pm pst Friday... A dry cold front will bring
strong gusty north winds to the waters, particularly overnight
tonight and into Saturday morning, with gusty north winds
persisting through Sunday. Gale force winds are likely across all
outer water zones beginning late tomorrow night through at least
Sunday morning. The strong and gusty winds will create very steep
wind waves and fresh swell, creating very rough and hazardous
seas through the majority of the weekend.
Mtr watches warnings advisories
Tngt Wind advisory... Caz507-511-512-517-518
sca... Pigeon pt to pt pinos 0-10 nm from 9 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
from 9 pm
sca... Pt arena to pigeon pt 10-60 nm until 12 am
glw... Pt arena to pigeon pt 10-60 nm from 12 am
sca... Pigeon pt to pt piedras blancas 10-60 nm
from 6 pm until 12 am
glw... Pigeon pt to pt piedras blancas 10-60 nm
from 12 am
sca... Pt arena to pt reyes 0-10 nm until 7 pm
glw... Pt arena to pt reyes 0-10 nm from 7 pm
sca... Pt reyes to pigeon pt 0-10 nm from 7 pm
public forecast: bell
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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 Port Chicago, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Livermore, Livermore Municipal Airport, CA||16 mi||35 min||N 0||4.00 mi||Fair with Haze||53°F||43°F||69%||1016.9 hPa|
|Stockton, Stockton Metropolitan Airport, CA||18 mi||33 min||NNW 3||5.00 mi||Fair with Haze||51°F||41°F||69%||1016.4 hPa|
Wind History from LVK (wind in knots)
|1 day ago||Calm||E||Calm||Calm||Calm||Calm||Calm||E||Calm||Calm||E||E||E||E||E||E||NE||NE||E||E||E||NE||E|
|2 days ago||Calm||Calm||E||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||E||E||Calm||Calm||SW||NE||E||E||E||E||Calm||Calm||E |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Borden Highway Bridge |
Click for Map
Fri -- 04:44 AM PST Moonrise
Fri -- 04:57 AM PST 2.39 feet High Tide
Fri -- 07:15 AM PST Sunrise
Fri -- 10:17 AM PST 0.79 feet Low Tide
Fri -- 03:30 PM PST Moonset
Fri -- 04:29 PM PST 3.26 feet High Tide
Fri -- 04:48 PM PST Sunset
Fri -- 11:42 PM PST -0.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Vulcan Island .5 mi E |
Click for Map
Fri -- 02:27 AM PST 0.58 knots Max Flood
Fri -- 04:43 AM PST Moonrise
Fri -- 05:21 AM PST -0.00 knots Slack
Fri -- 07:14 AM PST Sunrise
Fri -- 07:57 AM PST -0.32 knots Max Ebb
Fri -- 10:29 AM PST 0.00 knots Slack
Fri -- 01:32 PM PST 0.70 knots Max Flood
Fri -- 03:29 PM PST Moonset
Fri -- 04:47 PM PST Sunset
Fri -- 04:56 PM PST -0.00 knots Slack
Fri -- 08:52 PM PST -0.62 knots Max Ebb
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 (22,6,7,8)(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.