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 6:28PM||Tuesday October 17, 2017 1:27 PM PDT (20:27 UTC)||Moonrise 4:06AM||Moonset 4:45PM||Illumination 7%|
EDIT (on/off)  Help
|PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 825 Am Pdt Tue Oct 17 2017 |
Today..N winds 5 kt...becoming sw 5 to 15 kt in the afternoon. Patchy smoke in the afternoon.
Tonight..SW winds 5 to 15 kt. Patchy smoke.
Wed..SW winds 5 to 15 kt. Patchy smoke.
Wed night..SW winds 10 to 20 kt.
Thu..SW winds 10 to 20 kt. Chance of rain.
Fri..W winds 10 kt. Slight chance of rain.
Sat..W winds 10 kt.
|PZZ500 825 Am Pdt Tue Oct 17 2017 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A system is currently moving to the northeast towards the coastal waters that has lightning associated with it. This will bring a chance of Thunderstorms to the southern waters late this morning and into this evening. A trough and cold front will move across the coastal waters from the gulf of alaska late Thursday. The cold front will be accompanied by light rain. A moderate to long period mixed northwesterly and southerly swell is expected this afternoon and tonight. A very large northwesterly swell train, the largest of the season to date, will then arrive over the waters Thursday night lasting through the period. This large swell will create hazardous conditions.
7 Day Forecast for Marine Location Near Ladera, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 171740|
area forecast discussion
national weather service san francisco bay area
1040 am pdt Tue oct 17 2017
Synopsis After two very warm days, a gradual cooling trend is
forecast for today and tomorrow. The pattern will then change as
a system drops down from the north and brings generally light
rainfall to parts of the area late Thursday into Friday.
Discussion As of 9:19 am pdt Tuesday... Visible satellite shows
cloud cover approaching the california coast associated with
increased mid level moisture. Infrared satellite imagery shows
cool tops between -20 and -30 deg c with some lightning detected
about 300 miles west of point conception. Short-term guidance does
bring some of this increased moisture as far north as southern
monterey and san benito counties this afternoon. We'll continue to
monitor the latest satellite and radar trends through the
afternoon and evening. Temperatures are not forecast to be as warm
as yesterday as onshore flow is forecast to return this afternoon
to many locations in the area. Highs will generally range from
the middle 60s to middle 70s along the coast and middle 70s to
middle 80s for interior areas. Aside from a few minor adjustments
to sky cover based on current satellite trends, no major changes
anticipated for the short-term forecast. For additional details
beyond day 1, please refer to the previous discussion section.
Prev discussion As of 3:00 am pdt Tuesday... After two days
which saw very warm temperatures all of the way to the coast, a
cooling trend will start as the ridge of high pressure that has
been overhead weakens and is briefly replaced by a zonal flow.
Both today and tomorrow will see temperatures drop 3 to 8 degrees.
So, instead of widespead 80s to mid 90s, we will see highs back
in the 60s and 70s by Wednesday.
At the same time, we have been closely watching the latest
guidance as a weak disturbance is forecast to move from just off
the coast toward the far southern part of our region later today.
Goes16 is picking up this feature and already shows some cooling
cloud tops in the area. Models remain all over the board with
what will happen with this feature. Local WRF and hrrrx both
indicate light precipitation over the souther third of monterey
county and possibly into the southern portion of san benito
county. However, a slew of other models keep the moisture to the
south and indicate only some clouds. Based on both the hrrrx and
wrf keeping any convection in far southern parts of our cwa,
decided to go with 15 pops but keep it confined from around big
sur and points to the east and south. Biggest concern would be for
dry lighting if we do get anything to form. Any precipitation
should be off to the east by the evening.
All signs still point to a brief but substantial pattern change as
a system drops down from the gulf of alaska and brings rain into
the north bay by late on Thursday. In general guidance has backed
off a bit with rainfall amounts compared to 24 hours ago on the
global models. However, 0z and 06z NAM do keep precipitation going
as the associated front moves through. Still looks like between
10" and 20" for many spots especially for san francisco bay
northward. The rest of our region will likely see lesser amounts.
Winds will be locally breezy due to the frontal passage, however
speeds should mostly stay under 20 mph.
A ridge of high pressure in the pacific will rebuild to the coast
over the weekend before becoming nearly stationary near our cwa
next work week. 500 mb heights could approach an impressive 597 dm|
suggesting another round of heat is likely.
Aviation As of 10:40 am pdt Tuesday... For 18z tafs. Currently
vfr to MVFR conditions across the area with smoke from various
wildfires reducing visibilities. Winds will begin to transition to
onshore flow later today remaining relatively light. Patchy
coastal stratus and fog may return to the immediate coast this
evening, as of now not expecting low CIGS to impact terminals
aside from possibly kmry and ksns tomorrow morning.
Vicinity of ksfo...VFR with haze from wildfire smoke. Latest hrrr
smoke forecast suggests visibilities will improve this afternoon.
Winds light and variable until 22z then nw-n near 10 knots into
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals...VFR, with reduced visibilities to MVFR
possible today due to the wildfire in the santa cruz mountains.
Stratus to return late tonight or early tomorrow morning. Latest
guidance suggests ifr CIGS will hold off until early tomorrow
morning, tafs will be updated should this change.
Fire weather As of 10:35 pm pdt Monday... A pattern change is
on the way, with a general cooling, moistening trend and the
possibility of wetting rains arriving this week. Winds will begin
to shift and become more onshore tonight, helping to bring the
cooler temps, moister air mass, and improved air quality for many
areas. Temperatures will decrease a few to several degrees each of
the next 3 days, returning to near normal temperatures by mid
week. Humidities will also increase given the cooler temperatures
and onshore flow. Some uncertainty regarding the upcoming rains.
A convective complex off of the baja california coast located on
the southwestern flank of the exiting ridge will bring a slight
chance of thunderstorms southern monterey and san benito counties
from late this morning through the evening.
Model data now indicates light non-wetting warm sector precip
arriving late morning Thursday, while the main band of cold
frontal precipitation arriving Thursday evening through Friday
morning. This system will bring wetting rains to some areas but
not others, with the best chance of wetting rains over the north
bay mountains and hills, where fires are most active. Much less
precipitation is expected farther southward and or at lower
Marine As of 08:25 am pdt Tuesday... A system is currently
moving to the northeast towards the coastal waters that has
lightning associated with it. This will bring a chance of
thunderstorms to the southern waters late this morning and into
this evening. A trough and cold front will move across the coastal
waters from the gulf of alaska late Thursday. The cold front will
be accompanied by light rain. A moderate to long period mixed
northwesterly and southerly swell is expected this afternoon and
tonight. A very large northwesterly swell train, the largest of
the season to date, will then arrive over the waters Thursday
night lasting through the period. This large swell will create
Mtr watches warnings advisories
Public forecast: rowe bell
fire weather: drp
visit us at
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
|Palo Alto Airport, CA||7 mi||1.7 hrs||NNE 7||mi||Smoke||70°F||55°F||60%||1019.3 hPa|
|San Carlos Airport, CA||9 mi||1.7 hrs||NE 3||3.00 mi||Smoke Haze||68°F||53°F||60%||1019.6 hPa|
|Mountain View, Moffett Field, CA||9 mi||91 min||N 4||10.00 mi||Smoke||73°F||44°F||35%||1019.8 hPa|
|San Jose, San Jose International Airport, CA||15 mi||34 min||NNW 5||5.00 mi||Mostly Cloudy with Haze||77°F||37°F||24%||1018.9 hPa|
|San Francisco, San Francisco International Airport, CA||17 mi||31 min||NE 4||5.00 mi||Mostly Cloudy with Haze||68°F||50°F||53%||1018.8 hPa|
|Half Moon Bay Airport, CA||17 mi||32 min||NW 8||9.00 mi||Fair||63°F||48°F||60%||1018.3 hPa|
|Hayward, Hayward Air Terminal, CA||19 mi||33 min||N 0||7.00 mi||Fair||73°F||36°F||26%||1019.8 hPa|
|San Jose / Reid / Hillv, CA||21 mi||40 min||NNW 7||10.00 mi||Smoke||79°F||35°F||21%||1020.3 hPa|
|Oakland, Metro Oakland International Airport, CA||21 mi||34 min||WSW 3||4.00 mi||Mostly Cloudy with Haze||70°F||43°F||38%||1018.9 hPa|
Wind History from PAO (wind in knots)
|1 day ago||N||N||NW||N||NW||Calm||Calm||Calm||Calm||Calm||Calm|
|2 days ago||N||N||N||N||N||N||N||Calm||Calm||Calm||N||N||N |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Redwood City |
Click for Map
Tue -- 05:06 AM PDT Moonrise
Tue -- 05:25 AM PDT 0.54 feet Low Tide
Tue -- 07:19 AM PDT Sunrise
Tue -- 11:44 AM PDT 8.55 feet High Tide
Tue -- 05:45 PM PDT Moonset
Tue -- 06:00 PM PDT 0.82 feet Low Tide
Tue -- 06:28 PM PDT Sunset
Tue -- 11:55 PM PDT 7.89 feet High 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
Tue -- 03:59 AM PDT -1.13 knots Max Ebb
Tue -- 05:05 AM PDT Moonrise
Tue -- 06:23 AM PDT 0.00 knots Slack
Tue -- 07:18 AM PDT Sunrise
Tue -- 09:10 AM PDT 1.47 knots Max Flood
Tue -- 12:07 PM PDT -0.00 knots Slack
Tue -- 04:30 PM PDT -1.13 knots Max Ebb
Tue -- 05:45 PM PDT Moonset
Tue -- 06:27 PM PDT Sunset
Tue -- 06:52 PM PDT 0.00 knots Slack
Tue -- 09:34 PM PDT 1.40 knots Max Flood
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 (16,3,4,5)(on/off)  Help
Ad by Google
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.