Tuesday, January16, 2018 L-36.com


Marine Weather and Tides
Foster City, CA

Version 3.4
What's New / NOTES
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 7:20AMSunset 5:18PM Tuesday January 16, 2018 1:30 AM PST (09:30 UTC) Moonrise 7:00AMMoonset 5:13PM Illumination 0% Phase: New Moon; Moon at 29 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- 809 Pm Pst Mon Jan 15 2018
Tonight..N winds 5 kt...becoming S after midnight. Slight chance of rain in the evening, then chance of rain after midnight.
Tue..SE winds 5 kt...becoming sw in the afternoon. Chance of rain in the morning.
Tue night..N winds 10 kt.
Wed..NW winds 10 kt.
Wed night..SW winds 10 kt.
Thu..SW winds 5 to 15 kt. Chance of rain, then chance of showers.
Fri..W winds 5 to 15 kt. Chance of showers, then slight chance of showers.
Sat..SW winds 10 kt.
PZZ500 809 Pm Pst Mon Jan 15 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Southwesterly winds will continue tonight as a storm system approaches from the west. A longer period swell will continue to impact the coast through Tuesday. A larger and more powerful swell will arrive Wednesday night or Thursday morning.

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 160601
afdmtr
area forecast discussion
national weather service san francisco bay area
1001 pm pst Mon jan 15 2018

Synopsis A weakening storm system will bring light rainfall to
mainly the northern half of the region through Tuesday morning.

Conditions then dry out late Tuesday into Wednesday before another
weak system brings additional rainfall to much of the region.

With a colder air mass in place, lingering showers are likely on
Friday. A drying trend and cooler temperatures are forecast for
the weekend before a third, potentially stronger system, arrives
late in the weekend.

Discussion As of 9:01 pm pst Monday... Models appear to have a
good handle on the current weather situation this evening. Light
rain has been reported over sonoma and marin for the last few
hours with accumulations anywhere from a hundredth to just under
a tenth of an inch. The approaching system will bring light rain
to the north bay region through late this evening with light
rain spreading south across the greater san francisco bay area
overnight. While the north bay area will see the bulk of the
precip with storm totals around 0.3" to 0.5", models indicate the
trailing end of the frontal boundary will deposit anywhere from
0.1" to 0.2" across the bay area as the front dissipates. The
santa cruz mountain will likely see slightly more due to the
terrain unfortunately little to none is expected from the
monterey bay south.

So far the winds have stayed fairly light with sustained winds
around 5 to 10 mph. Higher elevations in the north and east
bays continue to see elevated gusts to around 20 mph. Breezy
conditions are expected to accompany frontal passage overnight
however widespread gusty winds are not anticipated.

Weak ridging, anticipated for Tuesday and Wednesday, will bring
a return to dry conditions and near normal temperatures as the
region transitions between system.

From previous discussion... Our next system is forecast to arrive
late Wednesday into Thursday and bring additional rainfall to the
region. This system too appears to be generally weak as the bulk
of mid upper level support remains well north of the region.

However, much colder air is forecast to advect southward and
result in lowering snow levels across the state. With a colder air
mass and mid upper level trough aloft, do expect lingering post
frontal showers into Friday. Additional rainfall amounts range
from around 1 4" to 1 2" for most urban areas (greatest in the
north bay and along the coast) with less than 1 4" for our drier
inland valleys. Coastal ranges in the north bay could see upwards
of around 1" with amounts closer to 1 2" for the coastal ranges to
the south.

As conditions dry out late Friday into Saturday, colder overnight
conditions are likely. Look for widespread 30s inland with lower 40s
near the coast Friday night into Saturday morning and again Saturday
night into Sunday morning. Much of this will depend on how much
clearing occurs this weekend so be sure to check back for updated
forecast information.

The forecast models continue to show the potential for a stronger
system to impact the region late in the weekend into early next
week. However, the models and run-to-run solutions do differ on the
details at this time. With that said, do look for widespread
rainfall and slightly stronger winds with this third system. Again,
stay tuned for additional details on potential impacts.

Aviation As of 10:00 pm pst Monday... Little change from the
previous TAF package as light rain is forecast to move across
some of the terminals tonight. Main focus will be north of san
jose. CIGS remain tricky although koak has now dropped down to
MVFR level along with ksts. That should continue into the morning.

Winds generally under 10 kt. Moderate confidence.

Vicinity of ksfo... Latest cig is around 035 which is close to
thinking from the previous package. Would expect it to drop to
around 025 in the next couple of hours. Models continue to show
rain returning around 10z possibly lasting for a few hours.

However, generally returning to dry weather by or even before 14z.

Vfr after 16z. Moderate confidence.

Sfo bridge approach... Rain favored for northern portion of the
approach over the southern portion. Otherwise similar to sfo.

Monterey bay terminals... GenerallyVFR through the period as the
system will be too far to the north. Potential for mvrf at kmry
after 10z. Ksns has already dropped down to ifr and will likely be
there all night.VFR after 16z tomorrow. Moderate to high
confidence.

Marine As of 8:09 pm pst Monday... Southwesterly winds will
continue tonight as a storm system approaches from the west. A
longer period swell will continue to impact the coast through
Tuesday. A larger and more powerful swell will arrive Wednesday
night or Thursday morning.

Mtr watches warnings advisories
Tday High surf advisory... Caz006-505-509-529-530
sca... Rough bar advisory for sf bar
public forecast: cw
aviation: bell
marine: bell
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi43 min SE 1.9 G 2.9 55°F 55°F1021.7 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi49 min Calm G 2.9 55°F 54°F1021.5 hPa
LNDC1 17 mi43 min ESE 1 G 2.9 56°F 1021.3 hPa
OBXC1 18 mi43 min 55°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi43 min NNW 4.1 G 5.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi43 min Calm G 1.9 55°F 1020.6 hPa
PXSC1 19 mi43 min 56°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi43 min N 2.9 G 4.1 54°F 1021.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi43 min ESE 1.9 G 1.9 56°F 1021.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 26 mi52 min E 4.1 53°F 1022 hPa
46237 - San Francisco Bar, CA (142) 26 mi61 min 54°F9 ft
RCMC1 - 9414863 - Richmond, CA 27 mi49 min E 1.9 G 2.9 55°F 53°F1021 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi43 min Calm G 1.9 49°F 52°F1021.7 hPa49°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi41 min SSE 9.7 G 12 54°F 54°F12 ft1020.7 hPa (+1.5)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi43 min E 7 G 8.9 50°F 1021.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi41 min SSE 5.8 G 9.7 57°F 57°F13 ft1020.3 hPa (+0.9)
PCOC1 - 9415144 - Port Chicago, CA 37 mi43 min NNE 1.9 G 1.9 49°F 51°F1021.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi43 min E 1.9 G 1.9 49°F 1021.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi106 min SW 1 47°F 1022 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi36 minS 310.00 miMostly Cloudy55°F51°F88%1021.3 hPa
Palo Alto Airport, CA8 mi4.7 hrsN 07.00 miPartly Cloudy50°F50°F100%1020.3 hPa
San Francisco, San Francisco International Airport, CA8 mi35 minN 09.00 miOvercast57°F54°F90%1021.2 hPa
Oakland, Metro Oakland International Airport, CA10 mi38 minESE 58.00 miOvercast55°F52°F90%1021.4 hPa
Hayward, Hayward Air Terminal, CA10 mi37 minESE 78.00 miOvercast56°F48°F75%1022.1 hPa
Mountain View, Moffett Field, CA13 mi35 minSE 510.00 miFair51°F50°F96%1021.8 hPa
Half Moon Bay Airport, CA14 mi36 minE 31.75 miFog/Mist55°F55°F100%1020.7 hPa
San Jose, San Jose International Airport, CA21 mi38 minESE 410.00 miA Few Clouds55°F48°F80%1021.6 hPa

Wind History from SQL (wind in knots)
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Last 24hrW4CalmCalmNW4SW3S5CalmN333N3CalmNW4N6CalmW5CalmCalmCalmCalmCalmCalmS3E3
1 day agoS3S3CalmCalmSW3CalmCalmCalm3CalmCalm--Calm34N3CalmCalmE4CalmN5W3CalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmSE6E7E3Calm3CalmCalmCalmCalmCalmCalmCalmSW3CalmCalmCalmCalm

Tide / Current Tables for Bay Slough, west end, San Francisco Bay, California
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Bay Slough
Click for Map
Tue -- 12:52 AM PST     6.44 feet High Tide
Tue -- 06:04 AM PST     2.93 feet Low Tide
Tue -- 06:59 AM PST     Moonrise
Tue -- 07:22 AM PST     Sunrise
Tue -- 11:21 AM PST     8.28 feet High Tide
Tue -- 05:12 PM PST     Moonset
Tue -- 05:15 PM PST     Sunset
Tue -- 06:18 PM PST     New Moon
Tue -- 06:49 PM PST     -0.42 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.16.465.14.13.32.93.34.45.97.38.28.17.45.94.12.20.7-0.2-0.40.21.32.84.4

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Tue -- 01:27 AM PST     -0.00 knots Slack
Tue -- 03:57 AM PST     -0.80 knots Max Ebb
Tue -- 06:44 AM PST     0.00 knots Slack
Tue -- 07:00 AM PST     Moonrise
Tue -- 07:22 AM PST     Sunrise
Tue -- 09:21 AM PST     1.25 knots Max Flood
Tue -- 12:27 PM PST     -0.00 knots Slack
Tue -- 04:03 PM PST     -1.83 knots Max Ebb
Tue -- 05:12 PM PST     Moonset
Tue -- 05:15 PM PST     Sunset
Tue -- 06:18 PM PST     New Moon
Tue -- 07:38 PM PST     0.01 knots Slack
Tue -- 10:30 PM PST     1.72 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.4-0.3-0.7-0.8-0.7-0.40.20.81.21.20.90.3-0.4-1.1-1.6-1.8-1.6-1.2-0.50.41.21.71.7

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (4,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.