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 6:50 PM PDT (01:50 UTC) Moonrise 2:36PMMoonset 3:11AM Illumination 82% Phase: Waxing Gibbous; Moon at 11 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 229 Pm Pdt Wed Apr 25 2018
Tonight..SW winds 10 to 20 kt.
Thu..SW winds 5 to 15 kt...increasing to 10 to 20 kt in the afternoon.
Thu night..W winds 10 to 20 kt.
Fri..W winds 5 to 15 kt.
Fri night..W winds 5 to 15 kt.
Sat..W winds 10 to 20 kt...decreasing to 10 kt.
Sun..W winds 5 to 15 kt.
Mon..W winds 10 kt.
PZZ500 229 Pm 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... Winds will remain generally light over the coastal waters overnight, though locally breezy conditions could develop near coastal gaps or prominent points during the day on Thursday. Light to moderate seas will continue 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 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 260132
afdmtr
area forecast discussion
national weather service san francisco bay area
632 pm pdt Wed apr 25 2018

Synopsis Cool, summer likely conditions will persist over the
region through Thursday with additional cooling expected Friday
into the upcoming weekend. There will be a slight chance of
showers Friday night into Saturday for the far northern portions
of the north bay as the upper level system responsible for the
cool down pushes inland to our north. Dry conditions along with a
slight warming trend appears likely early next week.

Discussion As of 01:45 pm pdt Wednesday... The marine layer
again impacted the region this morning with low clouds slow to
burn-off through the late morning. Temperatures range from the
upper 50s at the coast to lower 70s in our warmer inland locations
as well as higher elevations above the 1,800 foot marine layer.

Looking for similar conditions tonight into Thursday ahead of an
approaching mid upper level trough.

Temperatures will trend a few degrees cooler on Friday and continue
to be below seasonal averages into the upcoming weekend in response
to the mid upper level trough pushing inland. The core of the upper
level low will then push into the pacific northwest and northern
california late Friday into Saturday and bring a slight chance of
showers. Rain showers may develop as far south as the northern
portions of the north bay during this time frame. However,
widespread rainfall is unlikely and most locations will remain dry,
especially south of the golden gate bridge.

A slight warming trend is then likely early next week as the trough
axis shifts inland and a ridge of high pressure develops over the
eastern pacific. However, the ridge is forecast to stay far enough
offshore to prevent significant warming. Ongoing dry weather
conditions are also expected in the extended forecast period.

Aviation As of 6:31 pm pdt Wednesday... Ongoing lower level
atmospheric cooling can be seen affecting the characteristics of
the marine layer per visible satellite imagery early this evening.

A weak trough focused at 925 mb over the coastal waters is drifting
eastward, 925 mb cooling will be greatly uneven with the greatest
cooling tending to settle in over the south bay to central coast
through tonight. Elsewhere a slower, but steady lower level cooling
will affect the marine layer overnight into Thursday morning as
well. In general, due to the proximity of a closed 500 mb low
approx 600 miles west of the bay area, waves of additional cooling
will continue to drift in from the west deepening to possibly mixing
out the marine layer Thursday. A negative tilt, amplifying mid level
trough arrives Thursday night which should further mix out the marine
layer. Weather conditions for this forecast period are thus mainly
favorable for the development of low stratus ceilings, not so much
fog due to a deepening marine layer; forecast confidence in the 00z
tafs is low to slightly more than moderate on ceiling bases, timing
and duration.

Vicinity of ksfo... The marine layer is deepening with stratus
accumulating along the san mateo coast. In the vicinity of ksfo
925 mb and 850 mb level temperatures cool to the point of mixing
out the marine layer possibly by late tonight, if not Thursday
morning. It's a complicated forecast with drying mixing into the
boundary layer, a further loss of the marine temperature inversion
through lower level cool air advection and then soon to arrive
nocturnal cooling. Inherited forecast looks good, only minor
adjustment made to the duration of westerly wind forecast this
evening. As advertised looks like good chances of MVFR cig
development no later than 07z, possibly a little earlier based on
recent satellite trend.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Being closer to greater cooling rates with
a 925 mb trough nearby the marine layer appears more chaotic in
structure, not very cohesive at the moment. Mixing and cooling is
tending to at least initially offset any traction the marine layer
stratus can make late this afternoon, however night-time cooling
and lower level cool air advection should result in stratus coverage
returning. Meso-scale forecasts are leaning toward high humidity
within the boundary layer tonight thus forecasts of MVFR look
good, tempo groups indicate start times in the 04z-08z time frame,
a bit broad brushed due to inherent forecast uncertainty as to
how when the stratus will form. It's slightly more than moderate
confidence that MVFR CIGS form tonight into Thursday morning.

Marine As of 5:15 pm pdt Wednesday... Winds will remain generally
light over the coastal waters overnight, though locally breezy
conditions could develop near coastal gaps or prominent points
during the day on Thursday. Light to moderate seas will continue
through the forecast period with a mixed south and northwest swell
developing late in the week.

Mtr watches warnings advisories
Tngt None.

Public forecast: rgass
aviation: canepa
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 mi50 min NW 9.9 G 12 61°F 68°F1016.8 hPa (-1.1)
AAMC1 - 9414750 - Alameda, CA 16 mi50 min W 9.9 G 12 57°F 64°F1017.3 hPa (-0.8)
LNDC1 17 mi50 min W 8 G 12 56°F 1017.1 hPa (-0.8)
OBXC1 18 mi50 min 55°F 49°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi50 min W 12 G 13
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi50 min SW 6 G 16 55°F 1016.2 hPa (-0.8)
PXSC1 19 mi50 min 56°F 48°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi50 min W 11 G 15 55°F 1017.1 hPa (-0.9)
FTPC1 - 9414290 - San Francisco, CA 21 mi50 min WSW 8.9 G 14 54°F 57°F1017.4 hPa (-1.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi50 min SSW 9.9 G 14 56°F 1017 hPa (-1.0)
46237 - San Francisco Bar, CA (142) 26 mi50 min 55°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 26 mi57 min SSW 8.9 55°F 1016 hPa (-1.0)
RCMC1 - 9414863 - Richmond, CA 27 mi50 min S 4.1 G 8 58°F 59°F1016.5 hPa (-1.0)
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi50 min WSW 14 G 17 63°F 63°F1015.4 hPa (-1.1)50°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi50 min SW 14 G 18 60°F 1015.7 hPa (-1.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi60 min W 7.8 G 9.7 52°F 56°F6 ft1017.9 hPa (-1.1)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi60 min WSW 3.9 G 5.8 54°F 58°F6 ft1017.5 hPa (-1.2)
PCOC1 - 9415144 - Port Chicago, CA 37 mi50 min WSW 14 G 22 65°F 63°F1015 hPa (-1.1)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi50 min NW 13 G 18 67°F 1014.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi65 min WNW 15 67°F 1015 hPa53°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi63 minW 1010.00 miClear64°F48°F56%1016.3 hPa
Palo Alto Airport, CA8 mi63 minNNW 1210.00 miClear0°F0°F%1016.3 hPa
San Francisco, San Francisco International Airport, CA8 mi1.9 hrsWNW 1510.00 miA Few Clouds62°F46°F56%1016.8 hPa
Oakland, Metro Oakland International Airport, CA10 mi57 minWNW 1410.00 miA Few Clouds58°F48°F70%1017 hPa
Hayward, Hayward Air Terminal, CA10 mi56 minWNW 1310.00 miFair61°F46°F58%1017.8 hPa
Mountain View, Moffett Field, CA13 mi1.9 hrsNNW 1110.00 miFair64°F52°F65%1016.9 hPa
Half Moon Bay Airport, CA14 mi55 minWSW 58.00 miOvercast54°F48°F82%1018.3 hPa
San Jose, San Jose International Airport, CA21 mi57 minWNW 129.00 miFair66°F52°F61%1016.1 hPa

Wind History from SQL (wind in knots)
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Last 24hrNW8NW8NW8NW5NW6NW3NW6NW5W3CalmS3SE3CalmNW4345N10N10N8N12W8W9W10
1 day agoNW7NW6NW8NW8NW5NW5NW4NW4CalmCalmE3E3E3CalmW64N7N8N6N11N12N13W8W7
2 days ago--NW9NW5NW5NW5NW5CalmNW4CalmCalmNW3CalmCalmCalmCalmCalmCalm3CalmN9N8W10W11W12

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
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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.