Marine Weather and Tides
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.
|Sunrise 7:11AM||Sunset 7:20PM||Sunday March 18, 2018 10:16 AM PDT (17:16 UTC)||Moonrise 7:11AM||Moonset 7:43PM||Illumination 4%|
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|PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 823 Am Pdt Sun Mar 18 2018 |
Today..NE winds 5 to 10 kt...becoming nw 5 to 15 kt this afternoon. Wind waves 2 ft or less. NW swell 4 to 5 ft at 10 seconds.
Tonight..N winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 15 seconds.
Mon..SE winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 14 seconds.
Mon night..SE winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft at 13 seconds.
Tue..SE winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. NW swell 2 to 3 ft at 12 seconds. Rain likely.
Tue night..SE winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. NW swell 6 to 7 ft at 11 seconds and sw around 3 ft at 11 seconds. Rain likely, mainly in the evening.
Wed..S winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. NW swell 7 to 8 ft and sw 3 to 4 ft. Rain likely.
Thu..SW winds 10 to 20 kt...becoming W 10 to 15 kt. Wind waves 3 to 4 ft...becoming 2 ft or less. Mixed swell nw 7 to 9 ft and sw 3 to 6 ft. A chance of rain.
|PZZ500 823 Am Pdt Sun Mar 18 2018 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the coastal waters will bring light northwest winds today and tonight. Winds will shift to southerly on Monday and increase Tuesday as a deep low tracks northeast across the offshore waters. Along with gusty winds seas will become mixed Tuesday through Thursday.
7 Day Forecast for Marine Location Near Monte Sereno, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 181553 cca|
area forecast discussion
national weather service san francisco bay area
849 am pdt Sun mar 18 2018
Synopsis Dry weather conditions and a slight warming trend can be
expected Sunday into Monday ahead of our next storm system. This
system will bring widespread rainfall to our region from Tuesday
through Thursday, along with the potential for periods of heavy
rain and locally strong southerly winds.
Discussion As of 08:45 am pdt Sunday... The broad upper low
that brought several days of unsettled weather to the region has
mostly exited california. In the wake of this storm system, high
pressure is now building in from the eastern pacific. Residual low
level moisture and mostly clear skies overnight allowed
temperatures to cool to their dew points which were generally in
the mid 30s to low 40s, generating areas of patchy dense fog in
most of the inland valleys around the san francisco bay area.
Temperatures are running a few to several degrees cooler than this
time yesterday morning, even in areas with the fog, primarily due
to the absence of insulating clouds in the mid levels that were
present yesterday morning.
For the rest of the day, expect light- mostly offshore winds with
afternoon temperatures that are a few to several degrees higher
than yesterday (upper 50s to low 60s). High clouds ahead of the
next storm system will begin to encroach on the region from the
west through the day today then gradually thicken and lower through
tomorrow as the next storm system approaches the golden state.
The weak ridge will strengthen inland through tomorrow,
bringing a warming and drying trend. Expect temperatures to climb
again for tomorrows daytime highs, with temperatures generally in
the mid to upper 60s.
The next storm system is evident about 1200 miles due west of
california oregon early this morning. This storm system is
currently breaking off from the mean westerly flow and digging
southward and is forecast to become a cutoff low over the next
several hours. As this system breaks away from the mean westerly
flow aloft, it will become coupled with a deep 1.4-1.6 tpw
subtropical moisture plume, advecting it towards california over
the next 48 to 96 hours. Forecast models have shown a clear trend
towards aiming this subtropical moisture plume at the central
coast, ie big sur, southward towards point conception santa
barbara county in southern california. As such, for now it
appears that most of the urban locations of the san francisco bay
area will dodge the heaviest rains. We will be closely monitoring
any northward trends of this moisture plume as it will greatly
affect the total forecast precipitation amounts. That said, the
san francisco bay area will not be excluded from some impacts from
this storm system. Instead, areas north of big sur should
anticipate more run of the mill storm system impacts associated
with the arrival of a moderate to strong cold frontal passage with
post frontal convective rain showers as the bulk of the enhanced
rainfall falls over big sur and socal. These impacts include gusty
southerly winds, with sustained speeds of 15 to 30 mph and gusts
of 35 to 55 mph possible ahead of and with the arrival of cold
front. The strongest winds will be over the usual locations, ie
the coast, higher elevation passes and peaks, and favorably
oriented valleys. Rainfall amounts will mainly range from 1-2
inches in most areas, while much more (3-5, locally up to 8
inches) are possible over the big sur santa lucia mountains due to
enhanced orographic precip and positioning of the deepest
moisture plume. Our main forecast challenge from now through the
arrival of the storm system will be to fine tune the timing,
positioning, and amounts of the rainfall winds associated with
this storm system. Due to the trajectory of this storm system
(west to east rather than our typical northwest to southeast),
expect rain to become widespread over the entire area around the
same time frame (lighter rain ahead of the deeper plume in the
warm sector Tuesday, then heavier rain in conjunction with the
arrival of the deeper moisture tap cold frontal boundary by
Wednesday, then lingering post frontal convection showers into
See previous forecast discussion for more details on the current
(overnight) forecast package.
Previous discussion As of 04:01 am pdt Sunday... Temperatures
are running a few to as much as 9 deg f cooler compared to 24
hours ago as mainly clear sky conditions prevail over the region.
Remnant low level moisture is helping to keep temperatures from
cooling too much and should prevent most locations from reaching
the freezing mark. With that said, patchy fog is already being
reported in the north bay valleys as well as the far southern
salinas valley as surface temperatures have cooled to dewpoint
values (generally in the middle 30s). In the santa clara and east
bay valleys, low clouds have developed early this morning. After a
cool start to the morning, temperatures will warm into the upper
50s to lower 60s as a short-wave ridge builds off of the coast.
Dry conditions along with additional warming is forecast for
Monday with most areas warming into the lower to upper 60s under a
mostly sunny sky.
A developing storm system well offshore is forecast to approach the
west coast by the midweek with deeper moisture advecting into the
california coast. With this, cloud cover will be on the increase
late Monday into Tuesday morning with widespread rain likely to
impact the region around or slightly after sunrise Tuesday morning.
The latest WRF and NAM forecast output shows moderate rain spreading
across the region with pwat values of 1.25" - 1.50" pointed toward
central and southern california through Tuesday afternoon. At this
time, the forecast models do point the deepest moisture into
monterey county southward (southern california). Regardless,
additional rainfall will likely impact the entire region again on
Wednesday as a weak mid upper level disturbance approaches northern
california. The core of the mid upper level trough will then rotate
across the region Thursday with continued changes for rain turning
to showers Thursday afternoon evening into Friday. Exact details on
the timing of each passing system and placement of the atmospheric
river remains difficult to pin-point at this time. Given the
uncertainly, folks should prepare for the potential for periods of
moderate to locally heavy rainfall and breezy winds during the
middle portion of the upcoming week.
While dry conditions will develop over the region late Friday
into Saturday, showers may linger across the northern portion of
the region during this time frame as one last mid upper level
disturbance pushes inland across northern california. Be sure to
to check back for the latest forecast information in the coming
days we continue to sort out the details.
Aviation As of 4:47 am pdt Sunday...VFR except local vlifr ifr
in patchy freezing valley fog until 16z or 17z. A light offshore
wind this morning becomes onshore 5-10 knots this afternoon. Cold
air drainage winds in the north bay, santa clara valley and salinas
valley will diminish later this morning.
Vicinity of ksfo...VFR. Light wind this morning becoming onshore
near 10 knots by early afternoon.
Sfo bridge approach... It's primarily clear so far to the san mateo
bridge, satellite imagery and observations show low clouds MVFR cigs
over the south bay. A few patches of low clouds could develop and or
drift in from the south into the approach zone this morning
otherwiseVFR is forecast through today.
Monterey bay terminals...VFR. E-se cold air drainage winds will
become light onshore by afternoon. Light e-se winds return this
Marine As of 4:01 am pdt Sunday... High pressure over the
coastal waters will bring light northwest winds today and tonight.
Winds will shift to southerly on Monday and increase Tuesday as a
deep low tracks northeast across the offshore waters. Along with
gusty winds seas will become mixed Tuesday through Thursday.
Mtr watches warnings advisories
Public forecast: drp
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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|
|RTYC1 - 9414523 - Redwood City, CA||22 mi||59 min||E 1 G 1.9||46°F||56°F||1022.8 hPa|
|46092 - MBM1||32 mi||71 min||NE 9.7||46°F||54°F||1022 hPa (+2.1)|
|ELXC1 - Elkhorn Slough Reserve, CA||32 mi||92 min||Calm||43°F||1022 hPa||41°F|
|46042 - MONTEREY - 27NM West of Monterey Bay, CA||34 mi||87 min||E 9.7 G 12||49°F||55°F||6 ft||1021.6 hPa (+1.9)|
|46114 - West Monterey Bay, CA||37 mi||47 min||55°F||6 ft|
|46240 - Cabrillo Point, Monterey Bay, CA (158)||41 mi||56 min||55°F||3 ft|
|AAMC1 - 9414750 - Alameda, CA||41 mi||65 min||SE 2.9 G 6||47°F||56°F||1022.4 hPa|
|LNDC1||42 mi||59 min||SSE 2.9 G 4.1||48°F||1022.4 hPa|
|OMHC1 - 9414769 - Oakland Middle Harbor Met, CA||43 mi||59 min||SE 2.9 G 4.1|
|MEYC1||43 mi||101 min||NE 1 G 1.9||46°F||55°F||1022.1 hPa|
|PXOC1 - 9414311 - San Francisco (Pier 1), CA||44 mi||59 min||ESE 5.1 G 6||48°F||1021.4 hPa|
|OBXC1||44 mi||59 min||49°F||45°F|
|OKXC1 - 9414776 - Oakland (Berth 34), CA||44 mi||59 min||S 1 G 2.9||48°F||1022.6 hPa|
|PXSC1||45 mi||59 min||50°F||47°F|
|46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA||45 mi||87 min||NNW 3.9 G 5.8||51°F||54°F||5 ft||1021.5 hPa (+1.9)|
|FTPC1 - 9414290 - San Francisco, CA||46 mi||59 min||NE 4.1 G 5.1||48°F||54°F||1022.7 hPa|
Wind History for Redwood City, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|San Jose, San Jose International Airport, CA||13 mi||24 min||N 0||10.00 mi||Mostly Cloudy||49°F||41°F||74%||1022.8 hPa|
|Mountain View, Moffett Field, CA||15 mi||21 min||N 0||10.00 mi||Fair||50°F||44°F||80%||1023.4 hPa|
|San Jose / Reid / Hillv, CA||16 mi||27 min||N 0||10.00 mi||Clear||48°F||39°F||71%||1022.3 hPa|
|Watsonville, Watsonville Municipal Airport, CA||24 mi||24 min||ENE 3||10.00 mi||Fair||47°F||42°F||83%||1023.1 hPa|
|San Carlos Airport, CA||24 mi||90 min||N 0||10.00 mi||Clear||45°F||39°F||81%||1022 hPa|
Wind History from SJC (wind in knots)
|1 day ago||SW||SW||SW|
|2 days ago||E||SE||S||S|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Gold Street Bridge |
Click for Map
Sun -- 02:07 AM PDT 9.03 feet High Tide
Sun -- 07:14 AM PDT Sunrise
Sun -- 08:10 AM PDT Moonrise
Sun -- 09:05 AM PDT 1.02 feet Low Tide
Sun -- 02:09 PM PDT 9.02 feet High Tide
Sun -- 07:18 PM PDT Sunset
Sun -- 08:42 PM PDT Moonset
Sun -- 09:18 PM PDT 0.56 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Dumbarton Point 2.3 mi NE |
Click for Map
Sun -- 02:24 AM PDT -0.01 knots Slack
Sun -- 06:36 AM PDT -1.16 knots Max Ebb
Sun -- 07:14 AM PDT Sunrise
Sun -- 08:10 AM PDT Moonrise
Sun -- 08:50 AM PDT 0.01 knots Slack
Sun -- 11:28 AM PDT 1.35 knots Max Flood
Sun -- 02:34 PM PDT -0.00 knots Slack
Sun -- 06:54 PM PDT -1.22 knots Max Ebb
Sun -- 07:18 PM PDT Sunset
Sun -- 08:43 PM PDT Moonset
Sun -- 09:09 PM PDT 0.00 knots Slack
Sun -- 11:48 PM PDT 1.36 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES 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.
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Other links: Northern Pacific Contential US Full GOES-East
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.