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 7:12AM||Sunset 7:18PM||Saturday March 17, 2018 9:13 AM PDT (16:13 UTC)||Moonrise 6:37AM||Moonset 6:40PM||Illumination 1%|
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|PZZ560 Pigeon Point To Point Pinos To 10 Nm- 827 Am Pdt Sat Mar 17 2018 |
Today..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft at 11 seconds. Chance of showers through the day. Slight chance of Thunderstorms in the afternoon.
Tonight..N winds 5 to 15 kt. Wind waves 3 ft in the evening... Becoming 2 ft or less. NW swell 5 to 6 ft at 10 seconds.
Sun..E winds 10 kt...becoming W in the afternoon. Wind waves 2 ft or less...becoming 3 ft in the afternoon. NW swell 4 to 5 ft at 10 seconds.
Sun night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 15 seconds.
Mon..SE winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft at 13 seconds.
Tue..SE winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 to 5 ft. SWell sw 3 ft. Chance of rain, then rain likely.
Wed..S winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 6 to 7 ft and sw 3 to 4 ft...shifting to the nw and sw 3 to 4 ft. Rain likely.
|PZZ500 827 Am Pdt Sat Mar 17 2018 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate winds across the coastal waters today. A passing storm system will produce scattered showers and possible Thunderstorms. Developed Thunderstorms will be capable of producing small hail, gusty winds, lightning and possibly a waterspout. High pressure will build in late tonight into Monday bringing a return of dry weather. Increasing winds with next week's low pressure system will generate fresh mixed shorter period swell.
7 Day Forecast for Marine Location Near Santa Clara, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 171555|
area forecast discussion
national weather service san francisco bay area
855 am pdt Sat mar 17 2018
Synopsis Showers will continue to move across the region today
with the potential for a few thunderstorms this afternoon. Look
for showers to diminish into this evening. Dry and slightly
warmer conditions are likely Sunday into Monday ahead of our next
storm system that will bring widespread rainfall to the region
Tuesday through Thursday of the upcoming week.
Discussion As of 08:50 am pdt Saturday... Local radar imagery
shows scattered showers across the coastal waters and monterey
bay region early this morning. Brief heavy downpours have been
reported with these cells as they've come ashore. So far, the
strongest of these cells have been about 10 to 30 miles offshore,
strengthening as they approach the coast, before decaying as they
push inland. These showers are forecast to continue to move across
the santa cruz, monterey, southern santa clara, and san benito
through the remainder of the morning and into the afternoon. An
isolated thunderstorm or two may also develop by late morning.
The broad parent trough that has brought several days of wet,
unsettled weather to the region has begun to transition downstream
and out of the region. The upper core of this 540dm 500mb trough
will shift into idaho while the base of the trough digs southeast
into southern california through the next 24 hours. In the wake of
this trough, a cold, mostly dry air mass will take hold over the
greater san francisco and monterey bay areas. The main forecast
challenge of the day is tonights forecast, given that clearing
skies and lighter winds will allow temperatures to plummet, but
just how much is the question. In a drier air mass, they would
cool quicker promoting more of a freeze frost risk, but with
lingering low level moisture, it is also possible we could see
very dense fog, similar to what santa rosa is experiencing already
this morning, across the region. With denser fog, temperature will
not cool as quickly, so frost freeze would be less of a risk. That
said, confidence is still low on fog frost freeze for tonight, but
watching satellite trends (amount of clearing on backside of
trough) and low level humidity values should provide the clues
Dry weather with clearer skies are forecast for Sunday and Monday,
meaning warming daytime temps and cooler nights.
The other forecast challenge of the day will be with the upcoming
storm system that will impact california from Tuesday into
Friday. Forecast models show an upper low coupled with a deep
tropical moisture tap impacting the state mid week next week.
Models still disagree on the positioning and amplitude of this
moisture plume, however, it is clear that the main impacts will be
felt in the locations at the center of this moisture hose. Most
model runs indicate the bulk of the moisture will be aimed at big
sur southward to the santa barbara area in southern california.
Areas farther northward, ie the north bay, are increasingly
unlikely to be hit by the heaviest precipitation located in the
concentrated moisture plume. Given the tropical nature of this
moist air mass, temperatures will be relatively warm, causing snow
levels to rise much higher than they have been with our recent
colder storm systems. The euro model suggests localized amounts of
around 8 inches are possible over the higher big sur peaks
assuming the plume hits there. The GFS on the other hand, is a bit
no significant changes expected to the current (overnight)
forecast package. See additional information on the current
forecast in the previous forecast discussion.
Previous discussion As of 04:00 am pdt Saturday... Scattered
showers continue to impact the region this morning and will
persist through much of the day as a short-wave disturbance pushes|
southward along the back side of the exiting trough. In addition,
snow levels are estimated to be around 3,000 feet this morning
based off of area profilers likely resulting in some snow
accumulations in the highest peaks across the region. By this
afternoon, forecast models show the atmosphere becoming more
unstable with surface-based CAPE values exceeding 400 j kg. Thus,
have added thunderstorms to the forecast with the potential for
small hail within any convective cells that do develop. Showers
are then forecast to diminish in coverage late in the evening and
then end by midnight. Sky conditions will begin to clear late in
the night through Sunday morning as a colder air mass settles into
the region. With this, look for much cooler overnight
temperatures with may inland areas dropping into the middle 30s.
If winds weaken as forecast, frost will be a concern for many
inland valley locations. Will need to monitor for the potential
for a frost advisory from late tonight into Sunday morning.
A warming and drying trend is then forecast for Sunday and Monday
as a weak ridge of high pressure develops over california. After
a cool start to the day, temperatures will warm into the 60s on
Sunday and into the middle upper 60s to near 70 on Monday ahead of
our next storm system. Mid high level clouds will also be on the
increase by late Monday afternoon and evening.
Wet weather conditions are forecast to return to the california
coast by Tuesday as a much deeper plume of moisture advects
inland. The latest forecast models show the potential for an
atmospheric river to set aim somewhere along the central or
southern california coast during the middle half of next week.
This would likely bring widespread rain to the region with periods
of moderate to locally heavy rainfall as a mid upper level trough
drops southward and approaches the cost Wednesday into Thursday.
At this time, it still appears the heaviest rainfall will be
across the central coast and into southern california. However,
widespread rain is also likely to impact the san francisco bay
area from Tuesday into Thursday. While it remains difficult to
nail down the details at this time, do expect most urban areas to
potentially pick up 1 to 2 inches of rainfall with 3 to 5 inches
along the coastal ranges. Please be sure to stay tuned to the
latest forecast information in the coming days.
Aviation As of 4:57 am pdt Saturday...VFR except MVFR in showers,
possible thunderstorms today. Low freezing levels. A few widely
scattered showers linger into this evening.
Vicinity of ksfo...VFR tempo MVFR in showers this morning. Vcts is
possible at any time today especially later this morning into the
early evening as indicated in the 12z ksfo taf.
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals...VFR tempo MVFR in showers this morning.
Vcts is possible at any time today especially later this morning
into the early evening as indicated in 12z tafs.
Marine As of 4:00 am pdt Saturday... An upper level trough will
result in additional showers and a slight chance of thunderstorms
today. Gusty winds are possible near thunderstorms. High pressure
will build in late tonight into Monday bringing a return of dry
weather. A low pressure system over the eastern pacific will tap
subtropical moisture bringing heavy rain and wind next Tuesday
through Thursday. Increasing winds with next week's low pressure
system will generate fresh mixed shorter period swell.
Mtr watches warnings advisories
Public forecast: drp
aviation marine: mm
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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||19 mi||43 min||ESE 4.1 G 6||46°F||57°F||1016.1 hPa|
|AAMC1 - 9414750 - Alameda, CA||34 mi||43 min||ESE 8 G 9.9||47°F||56°F||1015.7 hPa|
|LNDC1||35 mi||43 min||ESE 8 G 11||47°F||1015.6 hPa|
|OMHC1 - 9414769 - Oakland Middle Harbor Met, CA||37 mi||43 min||ESE 7 G 9.9|
|OBXC1||37 mi||43 min||48°F||46°F|
|OKXC1 - 9414776 - Oakland (Berth 34), CA||38 mi||43 min||SE 7 G 8.9||47°F||1015.7 hPa|
|PXSC1||39 mi||43 min||49°F||47°F|
|PXOC1 - 9414311 - San Francisco (Pier 1), CA||39 mi||43 min||ESE 8 G 11||48°F||1014.4 hPa|
|ELXC1 - Elkhorn Slough Reserve, CA||40 mi||88 min||SSE 5.1||44°F||1016 hPa||43°F|
|FTPC1 - 9414290 - San Francisco, CA||42 mi||43 min||Calm G 1||46°F||53°F||1015.8 hPa|
|PPXC1 - 9414847 - Richmond (Point Potrero), CA||44 mi||49 min||ESE 12 G 14||48°F||1015.9 hPa|
|46092 - MBM1||44 mi||67 min||SE 9.7||49°F||54°F||1016.5 hPa (+1.4)|
|PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA||46 mi||43 min||ESE 5.1 G 5.1||47°F||1015.6 hPa|
|RCMC1 - 9414863 - Richmond, CA||46 mi||43 min||SSE 6 G 8||48°F||54°F||1015.4 hPa|
|PCOC1 - 9415144 - Port Chicago, CA||47 mi||43 min||SSE 5.1 G 5.1||45°F||55°F||1015.6 hPa|
|MZXC1 - 9415102 - Martinez-Amorco CA||47 mi||43 min||SSE 2.9 G 4.1||49°F||54°F||1015.7 hPa||46°F|
|46237 - San Francisco Bar, CA (142)||48 mi||43 min||53°F||6 ft|
|46042 - MONTEREY - 27NM West of Monterey Bay, CA||49 mi||83 min||E 1.9 G 3.9||49°F||55°F||10 ft||1015.6 hPa (+0.6)|
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||2 mi||20 min||E 7||10.00 mi||Mostly Cloudy||48°F||42°F||80%||1015.8 hPa|
|San Jose / Reid / Hillv, CA||5 mi||26 min||S 7||10.00 mi||Mostly Cloudy||50°F||42°F||76%||1015.6 hPa|
|Mountain View, Moffett Field, CA||9 mi||17 min||SSE 4||10.00 mi||Partly Cloudy||46°F||42°F||86%||1016.4 hPa|
|San Carlos Airport, CA||21 mi||26 min||N 0||10.00 mi||Mostly Cloudy||46°F||42°F||87%||1015.9 hPa|
|Livermore, Livermore Municipal Airport, CA||23 mi||20 min||N 0||10.00 mi||Mostly Cloudy||42°F||41°F||96%||1015.7 hPa|
|Hayward, Hayward Air Terminal, CA||23 mi||19 min||SE 7||10.00 mi||Mostly Cloudy||49°F||41°F||74%||1016.8 hPa|
Wind History from SJC (wind in knots)
|1 day ago||SE||E||SE||S||S|
|2 days ago||SE||SE||S||S||E||NE||E||W||W||W||NW||W||W||Calm||S||SE||E||Calm||S||SE||E||SE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Gold Street Bridge |
Click for Map
Sat -- 01:40 AM PDT 8.77 feet High Tide
Sat -- 06:14 AM PDT New Moon
Sat -- 07:15 AM PDT Sunrise
Sat -- 07:37 AM PDT Moonrise
Sat -- 08:29 AM PDT 1.33 feet Low Tide
Sat -- 01:26 PM PDT 9.29 feet High Tide
Sat -- 07:17 PM PDT Sunset
Sat -- 07:40 PM PDT Moonset
Sat -- 08:46 PM PDT 0.31 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
Sat -- 01:54 AM PDT -0.00 knots Slack
Sat -- 05:58 AM PDT -1.07 knots Max Ebb
Sat -- 06:14 AM PDT New Moon
Sat -- 07:16 AM PDT Sunrise
Sat -- 07:38 AM PDT Moonrise
Sat -- 08:13 AM PDT 0.01 knots Slack
Sat -- 10:48 AM PDT 1.32 knots Max Flood
Sat -- 01:51 PM PDT -0.00 knots Slack
Sat -- 06:13 PM PDT -1.28 knots Max Ebb
Sat -- 07:17 PM PDT Sunset
Sat -- 07:40 PM PDT Moonset
Sat -- 08:38 PM PDT 0.01 knots Slack
Sat -- 11:14 PM PDT 1.41 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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)(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.