Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Foster City, CA

Version 3.4
What's New / NOTES
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 6:18AMSunset 7:55PM Wednesday April 25, 2018 11:06 AM PDT (18:06 UTC) Moonrise 2:36PMMoonset 3:11AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ531 San Francisco Bay South Of The Bay Bridge- 845 Am Pdt Wed Apr 25 2018
Today..NW winds 5 kt...becoming W 5 to 15 kt in the afternoon.
Tonight..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
Thu night..W winds 5 to 15 kt.
Fri..W winds 5 to 15 kt.
Sat..W winds 5 to 15 kt.
Sun..W winds 5 to 15 kt.
PZZ500 845 Am Pdt Wed Apr 25 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate west to northwest winds will continue through the week. Light to moderate seas will also persist through the forecast period with a mixed south and northwest swell developing late in the week.

7 Day Forecast for Marine Location Near Foster City, CA
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location: 37.55, -122.24     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 251737
afdmtr
area forecast discussion
national weather service san francisco bay area
1037 am pdt Wed apr 25 2018

Synopsis A cooling trend is forecast to persist through late
week and into the upcoming weekend as an upper level trough
approaches from the pacific. This system may produce a few showers
over the north bay late Friday into Saturday as it pushes inland
north of our region, yet widespread rainfall is unlikely.

Discussion As of 3:00 am pdt Wednesday... Onshore flow is
directly east-west as the sfo-sac gradient is 2 mb and the sfo-acv
gradient is neutral. This gives the marine air the maximum effect
over the district. With the marine layer holding around 1500 feet
night and morning low clouds can be expected around much of the
mry and sfo bay area while temperatures will remain as cool as
yesterday.

An upper low centered 750 miles west of point arena will drift
slowly ene. As it gets closer the marine layer will deepen even
more Thursday through Saturday bringing cool marine air into the
interior valleys. Models showing night and morning low clouds
spreading into places like livermore and concord Thursday night.

Eventually the marine layer will mix out but the airmass will be
colder so temperatures will continue below normal. By Saturday
highs around the entire CWA will range from the upper 50s at the
coast to the lower 70s in the far interior. Models continue to
show the upper low moving into northern california on Saturday.

Precipitation chances appear to be very slim and confined to
widely scattered showers in the north bay.

Medium range models now show a slow warming trend for the
beginning and middle of next week as the low moves further inland.

Temperatures should return to near their normal values by about
Wednesday.

Aviation As of 10:37 am pdt Wednesday for 18z tafs. Low
ceilings impacted all TAF terminals this morning with widespread
lifr ifr MVFR conditions. Visible satellite shows the gradual
eroding mixing-out of the stratus as of the 18z TAF publication
and think most terminals will transition toVFR conditions in the
next hour or so. The fort ord profiler indicates the marine layer
as gradually increased over the past 12 hours from about 1,500 ft
to 2,000 ft deep, likely in response to the approaching upper
level low. More of the same is expected this tonight with low
clouds again for Thursday morning.

Vicinity of ksfo... Transitioning from MVFR toVFR conditions at
the TAF publication time as this morning's stratus mixes out.

West to northwest winds are expected this afternoon around 15 kt.

The main concern turns to what is going to happen this
evening overnight with the stratus return. At this point think
we'll see bkn conditions return sometime after 6-7z Thursday, or
several hours earlier than this morning. Will continue to monitor
and update the TAF accordingly.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr conditions at kmry until late
morning as stratus lingers over the terminal. There is a non-zero
chance we could see the low clouds persist into the afternoon, but
confidence is too low to adjust the TAF as so. Expect low clouds
to return sometime in the late afternoon evening hours with
overcast conditions again for tomorrow morning.

Marine As of 10:21 am pdt Wednesday... Generally light to
locally moderate west to northwest winds will continue through
the week. Light to moderate seas will also persist through the
forecast period with a mixed south and northwest swell developing
late in the week.

Mtr watches warnings advisories
Tday None.

Public forecast: W pi
aviation: rowe
marine: rowe
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi48 min N 2.9 G 5.1 56°F 66°F1019.1 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi54 min W 4.1 G 6 53°F 60°F1019 hPa
LNDC1 17 mi48 min W 5.1 G 6 54°F 1018.9 hPa
OBXC1 18 mi72 min 53°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi48 min WSW 2.9 G 5.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi48 min W 7 G 11 56°F 1017.9 hPa
PXSC1 19 mi48 min 56°F 47°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi48 min SW 1.9 G 4.1 54°F 1019 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi54 min SW 4.1 G 8 52°F 54°F1019.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi48 min SW 8 G 9.9 53°F 1019.2 hPa
46237 - San Francisco Bar, CA (142) 26 mi66 min 53°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 26 mi55 min SE 4.1 53°F 1019 hPa
RCMC1 - 9414863 - Richmond, CA 27 mi54 min S 6 G 9.9 53°F 56°F1018.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi48 min WNW 15 G 17 54°F 62°F1018.2 hPa54°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi48 min W 8.9 G 12 55°F 1018.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi76 min SW 1.9 G 5.8 50°F 54°F5 ft1019.1 hPa (+1.5)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi76 min S 1.9 G 5.8 52°F 56°F8 ft1018.7 hPa (+1.3)
PCOC1 - 9415144 - Port Chicago, CA 37 mi48 min W 16 G 19 55°F 62°F1017.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi54 min NW 12 G 16 60°F 1017.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi81 min WNW 11 56°F 1017 hPa48°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi79 minVar 48.00 miOvercast55°F50°F82%1018.6 hPa
Palo Alto Airport, CA8 mi79 minVar 510.00 miMostly Cloudy0°F0°F%1018.6 hPa
San Francisco, San Francisco International Airport, CA8 mi70 minSSE 49.00 miOvercast58°F48°F70%1018.6 hPa
Oakland, Metro Oakland International Airport, CA10 mi73 minNW 410.00 miOvercast54°F48°F80%1018.8 hPa
Hayward, Hayward Air Terminal, CA10 mi72 minNNW 510.00 miOvercast56°F46°F70%1019.6 hPa
Mountain View, Moffett Field, CA13 mi70 minNNW 49.00 miMostly Cloudy59°F51°F75%1018.8 hPa
Half Moon Bay Airport, CA14 mi66 minSW 48.00 miOvercast52°F46°F82%1019.3 hPa
San Jose, San Jose International Airport, CA21 mi73 minVar 33.00 miMostly Cloudy with Haze58°F50°F75%1018.3 hPa

Wind History from SQL (wind in knots)
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Last 24hrN8N6N11N12N13W8W7NW8NW8NW8NW5NW6NW3NW6NW5W3CalmS3SE3CalmNW4345
1 day ago3CalmN9N8W10W11W12NW7NW6NW8NW8NW5NW5NW4NW4CalmCalmE3E3E3CalmW64N7
2 days agoCalmCalmN10NW6NW8NW8W9--NW9NW5NW5NW5NW5CalmNW4CalmCalmNW3CalmCalmCalmCalmCalmCalm

Tide / Current Tables for Bay Slough, west end, San Francisco Bay, California
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Bay Slough
Click for Map
Wed -- 04:11 AM PDT     Moonset
Wed -- 04:12 AM PDT     1.72 feet Low Tide
Wed -- 06:20 AM PDT     Sunrise
Wed -- 09:27 AM PDT     6.73 feet High Tide
Wed -- 03:36 PM PDT     Moonrise
Wed -- 04:22 PM PDT     -0.01 feet Low Tide
Wed -- 07:53 PM PDT     Sunset
Wed -- 10:44 PM PDT     7.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.84.43.12.21.7234.45.76.66.664.73.21.70.600.21.12.64.367.27.4

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Wed -- 01:55 AM PDT     -1.14 knots Max Ebb
Wed -- 04:11 AM PDT     Moonset
Wed -- 04:53 AM PDT     0.01 knots Slack
Wed -- 06:20 AM PDT     Sunrise
Wed -- 07:34 AM PDT     1.37 knots Max Flood
Wed -- 10:34 AM PDT     -0.00 knots Slack
Wed -- 01:59 PM PDT     -1.55 knots Max Ebb
Wed -- 03:36 PM PDT     Moonrise
Wed -- 05:13 PM PDT     0.01 knots Slack
Wed -- 07:53 PM PDT     Sunset
Wed -- 08:12 PM PDT     1.90 knots Max Flood
Wed -- 11:30 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-1.1-1.1-1-0.60.10.91.31.31.10.5-0.3-1-1.4-1.6-1.4-1-0.20.81.61.91.81.30.5

Weather Map and Satellite Images
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wmap_P
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 (14,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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Disclaimer:
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.