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 7:18AM||Sunset 5:23PM||Tuesday January 23, 2018 7:41 PM PST (03:41 UTC)||Moonrise 11:07AM||Moonset 11:59PM||Illumination 49%|
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|PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 233 Pm Pst Tue Jan 23 2018 |
.small craft advisory in effect from Wednesday morning through Wednesday evening...
Tonight..NE winds 5 kt.
Wed..SE winds 5 to 15 kt...becoming S 15 to 25 kt in the morning. Rain in the afternoon.
Wed night..SW winds 15 to 25 kt...becoming W 5 to 15 kt after midnight. Rain likely in the evening, then chance of showers after midnight.
Thu..SW winds 15 to 25 kt. Chance of showers.
Thu night..SW winds 10 to 20 kt. Chance of showers in the evening, then slight chance of showers after midnight.
Fri..W winds 10 kt.
Sat..NW winds 5 kt.
Sun..NE winds 5 kt.
|PZZ500 233 Pm Pst Tue Jan 23 2018 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An approaching storm system will approach tonight resulting in increasing southerly winds tonight and Wednesday. Increasing winds will result in hazardous conditions with steeper wind waves. The storm system will bring rain to the region and Thunderstorms to the northern waters.
7 Day Forecast for Marine Location Near Napa, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 240030|
area forecast discussion
national weather service san francisco bay area
430 pm pst Tue jan 23 2018
Synopsis Dry and seasonable weather with increasing high clouds
for the remainder of the day. Next front arrives weds morning in
the north bay and then spreads rain southward later weds afternoon
into weds night for the bay area into the central coast. Steady
rain quickly turns to showers for Thursday. A round of more
organized showers is possible Thursday afternoon as the upper low
moves inland. Dry weather forecast Friday through the weekend and
into early next week.
Discussion As of 12:00 pm pst Tuesday... After starting the
day 5 to 20 degrees cooler than yesterday and with areas of patchy
dense fog-- dry conditions, seasonal temperatures, and increasing
high level clouds are anticipated for the remainder of the day.
These high clouds, generally at about 25000 ft, are arriving at
the leading edge of an air mass boundary which is set to pass
through the san francisco and monterey bay areas in the form of a
cold front through the day tomorrow.
Forecast models are in fair agreement regarding the timing and
strength of this storm system, with some minor discrepancies in
timing and precipitation accumulations. Generally speaking, the
forecast models anticipate the leading edge of precipitation to
move into the northern periphery of the north bay by or just after
sunrise tomorrow. The main rain band will then transition
southeastward and pass the golden gate, moving into the immediate
san francisco bay area, around or just after lunchtime. Next, the
storm system will arrive in the south bay santa cruz area by late
afternoon tomorrow before shifting farther southward into the
greater monterey bay region by tomorrow evening.
Forecast models generally agree that this system will be stronger
than the last storm system to move through the area Sunday night,
but that this system will still be on the weaker side of mid-
winter storm systems. Overall, sustained winds will be breezy with
brief stronger gusts ahead of and with the frontal passage. Winds
will peak at around 35mph over the highest peaks and some coastal
areas, while most areas will generally experience breezy winds in
the 10 to 20 mph range. Precipitation amounts range from
1.25-1.75", 0.66-1.00" in the north bay valleys, 0.33-0.66" for
the san francisco bay area, except lesser amounts in the south bay
due to rain shadowing (ie around .25-.33"), with .20-.40" in the
monterey bay area, and less than .20" in the southern salinas
valley pinnacles np area. Post frontal instability will bring some
light lingering rain showers and an isolated thunderstorm (mainly
offshore of the sonoma coast) on Thursday. We will continue to be
running below normal seasonal precipitation with the forecast
precipitation amounts. Here is where we stand as of midnight this|
site since oct01 (seasonal) since jan01 (calendar)
obsrv normal %norm obsrv normal %norm
santa rosa 12.49 19.25 65 6.18 5.50 112
napa 6.04 10.69 57 3.01 3.37 89
concord 5.68 8.09 70 2.99 2.54 118
dt san francisco 7.99 12.02 66 4.70 3.18 148
sfo airport 7.51 10.36 72 4.46 3.00 149
oakland 7.52 10.60 71 4.30 3.29 131
hayward 4.77 8.82 54 2.76 2.53 109
livermore 4.80 7.92 61 2.81 2.34 120
san jose 4.27 7.27 59 2.70 2.18 124
moffett field 4.44 6.85 65 2.49 2.01 124
watsonville 5.57 10.42 53 3.32 3.20 104
monterey 6.11 7.80 78 4.13 2.65 156
santa cruz 8.33 15.08 55 5.33 4.20 127
weak ridging builds in behind tomorrow's storm system for Friday
through the weekend and into early next week, bringing dry
conditions, mild afternoons, and cold nights. Forecast models
bring a different low pressure into the area around Tuesday of
next week, however, the trajectory of this system means it will
most likely be dry and more of a wind producer, if anything, for
Aviation As of 4:30 pm pst Tuesday... A few stratocumulus
clouds this afternoon from residual low-level moisture. Next
system will bring increasing moisture Wednesday morning with lower
cigs into the sfo bay area after 15z. Timing of precip appears to
be after 20z for the sfo bay area. Southerly winds increase as
the front approaches after 20z with gusts to 25 kt.
Vicinity of ksfo...VFR through tonight becoming MVFR after 15z and
light rain after 19-20z. Light south to southeast wind overnight
increasing to 15-18 kt gusting to 25 kt after 20z.
Sfo bridge approach... Similar to sfo.
Monterey bay terminals...VFR through Wednesday morning becoming
MVFR after 20z.
Marine As of 4:30 pm pst Tuesday... An approaching storm system
will approach tonight resulting in increasing southerly winds
tonight and Wednesday. Increasing winds will result in hazardous
conditions with steeper wind waves. The storm system will bring
rain to the region and thunderstorms to the northern waters.
Mtr watches warnings advisories
Public forecast: drp
aviation: W pi
visit us at
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|SFXC1 - San Francisco Bay Reserve, CA||15 mi||57 min||SE 5.1||48°F||1022 hPa||45°F|
|DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA||17 mi||42 min||E 8 G 8.9||53°F||1022.2 hPa (-0.4)|
|MZXC1 - 9415102 - Martinez-Amorco CA||20 mi||42 min||ENE 4.1 G 4.1||51°F||52°F||1022.7 hPa (-0.3)||51°F|
|PCOC1 - 9415144 - Port Chicago, CA||21 mi||42 min||ENE 4.1 G 5.1||51°F||52°F||1022.5 hPa (-0.3)|
|RCMC1 - 9414863 - Richmond, CA||27 mi||42 min||NW 4.1 G 5.1||53°F||54°F||1022 hPa (-0.5)|
|PPXC1 - 9414847 - Richmond (Point Potrero), CA||28 mi||42 min||WNW 1 G 1.9||55°F||1022.6 hPa (-0.3)|
|PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA||28 mi||42 min||SSE 1.9 G 2.9||52°F||1022.4 hPa|
|TIBC1 - Tiburon Pier, San Francisco Bay, CA||30 mi||48 min||W 1.9||53°F||1023 hPa|
|OBXC1||34 mi||42 min||54°F||50°F|
|OKXC1 - 9414776 - Oakland (Berth 34), CA||34 mi||42 min||NW 4.1 G 4.1||53°F||1022.3 hPa (-0.4)|
|PXSC1||35 mi||42 min||55°F||48°F|
|PXOC1 - 9414311 - San Francisco (Pier 1), CA||35 mi||42 min||W 4.1 G 6||54°F||1021.3 hPa (-0.4)|
|OMHC1 - 9414769 - Oakland Middle Harbor Met, CA||35 mi||42 min||NW 4.1 G 4.1|
|LNDC1||35 mi||42 min||NNW 2.9 G 4.1||55°F||1022.2 hPa (-0.4)|
|FTPC1 - 9414290 - San Francisco, CA||36 mi||42 min||SW 4.1 G 6||52°F||54°F||1022.6 hPa (-0.3)|
|AAMC1 - 9414750 - Alameda, CA||37 mi||42 min||NNW 1 G 1.9||55°F||55°F||1022.3 hPa (-0.4)|
|46237 - San Francisco Bar, CA (142)||40 mi||42 min||54°F||5 ft|
|PRYC1 - 9415020 - Point Reyes, CA||42 mi||42 min||Calm G 1.9||54°F||1022 hPa (-0.4)|
|46026 - SAN FRANCISCO - 18NM West of San Francisco, CA||48 mi||52 min||NNW 5.8 G 5.8||53°F||54°F||5 ft||1022.4 hPa (-0.3)|
Wind History for Martinez-Amorco Pier, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Napa, Napa County Airport, CA||6 mi||48 min||E 5||10.00 mi||Fair||48°F||43°F||83%||1021.6 hPa|
|Petaluma Municipal Airport, CA||17 mi||47 min||N 0||10.00 mi||Mostly Cloudy||46°F||44°F||93%||1022.3 hPa|
|Novato / Gnoss Field, CA||18 mi||67 min||S 4||10.00 mi||Fair||48°F||46°F||94%||1022.7 hPa|
|Vacaville Nut Tree Airport, CA||18 mi||49 min||W 3||10.00 mi||Fair||48°F||45°F||89%||1023.1 hPa|
|Fairfield / Travis Air Force Base, CA||19 mi||1.7 hrs||E 4||10.00 mi||Fair||49°F||48°F||97%||1023 hPa|
Wind History from APC (wind in knots)
|1 day ago||SE||SE||SE||S||S||S||S||S||S||S||S||S||E||E||E||E||E||E||E||E||E||E||E||E|
|2 days ago||S||S||E||Calm||NE||Calm||Calm||W||Calm||Calm||Calm||N||Calm||N||Calm||SE||Calm||Calm||S||S||S||S||SE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Tue -- 06:14 AM PST 6.78 feet High Tide
Tue -- 07:20 AM PST Sunrise
Tue -- 11:07 AM PST Moonrise
Tue -- 12:47 PM PST 2.14 feet Low Tide
Tue -- 05:21 PM PST Sunset
Tue -- 06:03 PM PST 5.64 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Mare Island Strait |
Click for Map
Tue -- 02:50 AM PST 1.76 knots Max Flood
Tue -- 06:16 AM PST -0.00 knots Slack
Tue -- 07:20 AM PST Sunrise
Tue -- 08:17 AM PST -1.63 knots Max Ebb
Tue -- 11:07 AM PST Moonrise
Tue -- 12:28 PM PST 0.00 knots Slack
Tue -- 03:22 PM PST 1.01 knots Max Flood
Tue -- 05:22 PM PST Sunset
Tue -- 06:10 PM PST -0.00 knots Slack
Tue -- 08:25 PM PST -1.76 knots Max Ebb
Tue -- 11:58 PM PST 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 (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.