Monday, January22, 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 7:17AMSunset 5:24PM Monday January 22, 2018 8:12 AM PST (16:12 UTC) Moonrise 10:35AMMoonset 10:56PM Illumination 33% Phase: Waxing Crescent; Moon at 6 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- 221 Am Pst Mon Jan 22 2018
Today..SE winds 10 to 20 kt...decreasing to 10 kt in the afternoon. Chance of showers in the morning.
Tonight..NE winds 5 to 15 kt.
Tue..NE winds 10 kt.
Tue night..NE winds 5 kt.
Wed..SW winds 15 to 25 kt. Rain in the afternoon. Rain likely.
Thu..W winds 5 to 15 kt. Chance of showers.
Fri..NW winds 5 kt.
PZZ500 221 Am Pst Mon Jan 22 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate southerly winds will continue into the morning ahead of an approaching cold front. Winds will decrease and switch to the northwest behind the frontal passage. Small craft advisories remain in place mainly due to hazardous sea conditions caused by swell. SWells will gradually decrease today and Tuesday. The next frontal system is set to arrive mid-week bringing back southerly winds and increasing northwest swell.

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 221344
afdmtr
area forecast discussion
national weather service san francisco bay area
544 am pst Mon jan 22 2018

Synopsis Rain will steadily diminish over the san francisco bay
area this morning. Light rain will develop as far south as the
monterey bay area this morning before diminishing this afternoon.

A dry weather break will return later today into Tuesday. The next
weather system is forecast to bring soaking rains and locally gusty
winds Wednesday and Wednesday night with showers lingering Thursday
morning. Dry weather returns again by Friday and into next weekend.

Discussion As of 5:04 am pst Monday... A cold front was slowly
moving southeastward this morning, point arena buoy indicated
frontal passage at midnight. Heavy rain and gusty winds developed
ahead of this front with isolated rain total reports 3.40" at
venado, 2.54" cazadero, and upwards of 1-2" over remaining
locations of sonoma, napa, and marin counties. From last evening
and overnight locally wind gusts peaked to near 40 mph at gualala
and monte rio, elsewhere over the bay area gusts locally reached up
to 20-30 mph.

Moisture and warm air advection prior to the cold front extended
throughout the lower levels and possibly to the mid levels at times
helping to generate a wetter frontal passage, all in all it was a
pretty good rain producer considering the mid level flow is nearly
flat, very low amplitude, and mostly devoid of positive vorticity
advection. The 12z oakland sounding shows the air saturated up to
the 700 mb level. Kmux radar reflectivities still indicate a fair
amount of showers moving west to east at this hour over the bay
area, but the trend is for showers to steadily diminish this morning
as the cold front continues to settle southward.

A dry weather break returns later today into Tuesday. Daytime
temperature recovery will be in the 50s. Night-time temperatures
will be in the 30s to mid 40s, though inland valleys may see lows
in the upper 20s due to a decrease in cloud cover tonight thus
later shifts may need to adjust min temperatures downward a little
if needed. Also, patchy valley fog becomes a little more probable
if it clears out at night.

The next upstream wet weather system is expected to arrive wed-thu,
the incoming developing rain band may be a little slower to arrive
per most recent model output forecasting a delay up to 6 hours. A
strong cold front will interact with strengthening warm air advection,
coupled with large scale dynamics greatly favoring more widespread
soaking rain. The 250 mb jet stream will dig in from the northwest
increasing cyclonic curvature over the forecast area supporting stronger
upper level divergence. The ECMWF and NAM indicate a surface trough
and cold front sweeping in from the northwest later Wednesday. The
00z WRF model run indicates surface to 850 mb winds will be mainly
southwest which would limit rain shadowing effects in the valleys and
greatly increase QPF along windward slopes. To varying degrees recent
model data (within the last month or so) is seemingly more problematic
with regard to wind, QPF forecasts, thus this system normally would
of course need to be watched closely, but as always it's the unknowns
of pacific weather systems that can catch one off-guard sometimes.

This system may be one or our wetter rain producers we've seen so
far this season. Precipitable water values will be between 0.80" and
1" with warm air advection interacting with modified polar air, orographic
forcing, and strong dynamics. After this we get a break from the rain
with upper level ridging returning for late week and the weekend.

Aviation As of 03:34 am pst Monday... For 12z tafs. Kmux radar
still shows showers moving through the sf bay area. MVFR cigs
will continue periodically until this afternoon. Any lingering
heavier showers may temporarily reduce vis to MVFR as well.

Showers should be out of the north bay sf bay areas by around
18 20z. CIGS are expected to lower back to MVFR once again
tonight. Light winds.

Vicinity of ksfo... MVFR CIGS with showers currently passing
through. Conditions improving after 18z becomingVFR after 22z.

Southeast winds 5-10 kt becoming west after 20-22z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Currently MVFR at kmry withVFR CIGS at
ksns. Borderline MVFRVFR conditions through this afternoon. Some
light rain periodically from 12z-18z.

Marine As of 02:21 am pst Monday... Moderate southerly winds
will continue into the morning ahead of an approaching cold front.

Winds will decrease and switch to the northwest behind the frontal
passage. Small craft advisories remain in place mainly due to
hazardous sea conditions caused by swell. Swells will gradually
decrease today and Tuesday. The next frontal system is set to
arrive mid-week bringing back southerly winds and increasing
northwest swell.

Mtr watches warnings advisories
Tday Sca... Mry bay until 3 pm
sca... Pt reyes to pigeon pt 0-10 nm until 3 pm
sca... Pigeon pt to pt pinos 0-10 nm until 3 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Rough bar advisory for sf bar
public forecast: canepa
aviation: as
marine: as
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 5.1 G 7 51°F 54°F1026.1 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi43 min ESE 12 G 15 51°F 53°F1025.5 hPa
LNDC1 17 mi43 min ESE 2.9 G 6 51°F 1025.5 hPa
OBXC1 18 mi43 min 51°F 51°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi43 min SE 13 G 14
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi43 min SE 9.9 G 13 52°F 1024.4 hPa
PXSC1 19 mi43 min 54°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi43 min SE 7 G 9.9 51°F 1025.6 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi43 min WSW 7 G 9.9 54°F 54°F1025.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi43 min SE 8 G 12 53°F 1025.7 hPa
46237 - San Francisco Bar, CA (142) 26 mi73 min 54°F10 ft
RCMC1 - 9414863 - Richmond, CA 27 mi43 min SE 5.1 G 8.9 53°F 53°F1025.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi43 min NNE 1.9 G 2.9 52°F 52°F1025.4 hPa52°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi83 min NW 14 G 16 53°F 54°F12 ft1025.3 hPa (+0.4)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi43 min SW 8 G 9.9 54°F 1025 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi83 min WSW 16 G 19 56°F 56°F15 ft1025 hPa (+0.0)
PCOC1 - 9415144 - Port Chicago, CA 37 mi43 min ENE 4.1 G 6 49°F 51°F1025.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi43 min SE 8.9 G 11 47°F 1025.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi88 min SE 5.1 48°F 1025 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi26 minSE 66.00 miFog/Mist50°F50°F100%1025.7 hPa
Palo Alto Airport, CA8 mi26 minSE 103.00 miFog/Mist52°F48°F88%1026.1 hPa
San Francisco, San Francisco International Airport, CA8 mi77 minSE 55.00 miLight Rain Fog/Mist54°F51°F90%1025.3 hPa
Oakland, Metro Oakland International Airport, CA10 mi20 minSE 121.00 miLight Rain Fog/Mist50°F50°F100%1025.8 hPa
Hayward, Hayward Air Terminal, CA10 mi19 minSSE 102.50 miLight Rain52°F46°F83%1026.6 hPa
Mountain View, Moffett Field, CA13 mi77 minSE 710.00 miOvercast51°F45°F80%1026.5 hPa
San Jose, San Jose International Airport, CA21 mi20 minESE 113.00 miLight Rain51°F46°F83%1026.3 hPa

Wind History from SQL (wind in knots)
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Last 24hr3CalmCalm344333SW5SE5CalmCalmCalmS7S9S9S6S6SE9SE10SE8SE5SE6
1 day agoCalmCalmN5NE6N5N5NW11W12W7W5W5W6W5CalmCalmCalmCalmSE3CalmSE4CalmCalmCalmCalm
2 days agoCalm4N5NE5N5NW7NW10N9W10
G14
W6W6W6W4W5W3W4CalmW3NW5NW3W4W3CalmCalm

Tide / Current Tables for Bay Slough, west end, San Francisco Bay, California
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Bay Slough
Click for Map
Mon -- 04:07 AM PST     7.05 feet High Tide
Mon -- 07:19 AM PST     Sunrise
Mon -- 10:19 AM PST     2.45 feet Low Tide
Mon -- 10:35 AM PST     Moonrise
Mon -- 03:28 PM PST     6.30 feet High Tide
Mon -- 05:22 PM PST     Sunset
Mon -- 10:21 PM PST     0.83 feet Low Tide
Mon -- 10:56 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.445.46.676.864.93.82.92.52.63.44.55.56.26.25.74.83.62.31.40.91

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Mon -- 01:31 AM PST     1.50 knots Max Flood
Mon -- 05:12 AM PST     -0.00 knots Slack
Mon -- 07:19 AM PST     Sunrise
Mon -- 08:09 AM PST     -1.12 knots Max Ebb
Mon -- 10:35 AM PST     Moonrise
Mon -- 11:10 AM PST     0.00 knots Slack
Mon -- 01:44 PM PST     0.99 knots Max Flood
Mon -- 04:48 PM PST     -0.00 knots Slack
Mon -- 05:22 PM PST     Sunset
Mon -- 08:20 PM PST     -1.31 knots Max Ebb
Mon -- 10:56 PM PST     Moonset
Mon -- 11:13 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.41.51.20.70.1-0.4-0.9-1.1-0.9-0.5-0.10.40.910.80.4-0.1-0.5-1-1.3-1.2-0.7-0.1

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 (11,2,3,4)
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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.