Monday, November20, 2017 L-36.com


Marine Weather and Tides
Belvedere, 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 6:55AMSunset 4:56PM Monday November 20, 2017 7:41 AM PST (15:41 UTC) Moonrise 8:43AMMoonset 6:55PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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- 214 Am Pst Mon Nov 20 2017
Today..E winds 10 kt. Slight chance of rain in the morning.
Tonight..N winds 10 kt.
Tue..NW winds 10 kt.
Tue night..N winds 10 kt.
Wed..NW winds 10 kt.
Thanksgiving day..NW winds 5 to 10 kt.
Fri..NW winds 5 to 10 kt.
PZZ500 214 Am Pst Mon Nov 20 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... The eastern edge of a very moist sub-tropical flow will overlap the northern coastal waters through early this week. A warm frontal boundary connected to this moist flow will approach the coastal waters today and become nearly stationary while another warm front to the southwest advances toward it and the bay area. By late week into early next week a cold front will move southeastward over the coastal waters. Seas are expected to remain light to moderate through the first part of next week.

7 Day Forecast for Marine Location Near Belvedere, CA
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location: 37.83, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 201149
afdmtr
area forecast discussion
national weather service san francisco bay area
347 am pst Mon nov 20 2017

Synopsis A weather system will bring periods of light rain to
the north bay and possibly san francisco today. High pressure will
bring dry and warmer weather to the area Tuesday through Thursday.

The next chance of rain will be late this weekend.

Discussion As of 3:15 am pst Monday... Cloudcover and southwest
flow over the area is keeping temperatures in the 50s early this
morning which is about 10 degrees warmer than the past couple of
nights. A warm front is bringing light rain to the north bay this
morning. Rain amounts so far have generally been .10" or less.

Periods of light rain will continue through early afternoon in the
north bay with the possibility of a sprinkle as far south as san
mateo and alameda counties. Total rainfall amounts will remain
under one-quarter of an inch.

Things will dry out tonight as the warm front lifts north. An
upper level trough deepening along 145w will cause an upper level
ridge to build over southern california and nevada. This will
keep rain north of the district while bringing warmer temperatures
Tuesday through Thursday. The warmest temperatures will be
Wednesday and Thursday with highs in the 70s to lower 80s in
monterey and san benito counties. Temperatures around the sfo bay
area will warm into the upper 60s to lower 70s.

The ridge flattens on Friday and temperatures will cool off
slightly. Then the ridge moves a little to the east Saturday and
Sunday and the trough starts to move to the northeast. Medium
range models indicate a warm front will bring a chance of rain to
the north bay Saturday night and most of the rest of the district
Sunday. Then another chance of rain Sunday night and Monday as the
trough passes.

Based on recent performances by the models... Would not be surprised
if future model runs trend drier with the weekend system and track
it further north. In any case rainfall rates and amounts will be
light.

Aviation As of 3:47 am pst Monday... It'sVFR at the terminals
except CIGS are MVFR over the north bay this morning. Cloud bases
have been steadily lowering since last evening as a very moist,
milder, and stable SW flow from the sub-tropics becomes displaced
to the pacific northwest and northernmost california this week.

This plume of moisture will brush the north bay with light-moderate
rain today, while it remains mainly dry to dry elsewhere to the
south.

20-30 knot SW winds at the 925 mb and 850 mb levels over the north
bay counties will result in marginal low level wind shear (llws) at
ksts this morning til early afternoon. Lower level winds are much
less robust over the remaining bay area and areas to the south today
thus llws is not expected to the south.

Vicinity of ksfo... Light wind,VFR. Cloud bases lowering today, and
forecast is dry runways. Low to moderate confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Light e-se winds this morning, except SE to
10 knots salinas valley.VFR and dry. Moderate to high confidence.

Marine As of 3:35 am pst Monday... The eastern edge of a very
moist sub-tropical flow will overlap the northern coastal waters
through early this week. A warm frontal boundary connected to this
moist flow will approach the coastal waters today and become nearly
stationary while another warm front to the southwest advances toward
it and the bay area. By late week into early next week a cold front
will move southeastward over the coastal waters. Seas are expected
to remain light to moderate through the first part of next week.

Mtr watches warnings advisories
Tday None.

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

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi41 min E 1.9 G 2.9 56°F 57°F1018.3 hPa (-0.0)
PXSC1 3 mi41 min 58°F 53°F
OBXC1 6 mi41 min 56°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi41 min Calm G 1.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi41 min Calm G 1.9 56°F 1018.1 hPa (+0.4)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi41 min SE 1.9 G 1.9 57°F 1018.2 hPa (+0.0)
RCMC1 - 9414863 - Richmond, CA 7 mi41 min SSE 1 G 1.9 56°F 58°F1017.9 hPa (+0.3)
AAMC1 - 9414750 - Alameda, CA 8 mi41 min E 1 G 1.9 56°F 58°F1018.6 hPa (+0.3)
LNDC1 9 mi59 min Calm G 0 57°F 1018.1 hPa
46237 - San Francisco Bar, CA (142) 11 mi41 min 57°F2 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi41 min SSW 4.1 G 5.1 56°F 1017.6 hPa (-0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi51 min SE 7.8 G 9.7 57°F 57°F3 ft1017.5 hPa (-0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi41 min ESE 2.9 G 4.1 56°F 59°F1018.4 hPa (+0.4)50°F
RTYC1 - 9414523 - Redwood City, CA 25 mi41 min SE 1 G 1.9 56°F 60°F1018.6 hPa (+0.4)
PCOC1 - 9415144 - Port Chicago, CA 26 mi41 min E 5.1 G 6 55°F 58°F1017.9 hPa (-0.0)
PRYC1 - 9415020 - Point Reyes, CA 31 mi41 min ESE 9.9 G 13 56°F1017.3 hPa (+0.4)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi41 min SE 5.1 G 7 55°F 1018.1 hPa (+0.4)
SFXC1 - San Francisco Bay Reserve, CA 34 mi56 min E 1.9 54°F 1018 hPa48°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi51 min SSE 7.8 G 7.8 59°F 59°F3 ft1017.3 hPa (-0.0)

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA15 mi1.8 hrsN 010.00 miOvercast57°F48°F72%1017.6 hPa
Oakland, Metro Oakland International Airport, CA15 mi48 minN 010.00 miOvercast56°F48°F77%1018.4 hPa
Hayward, Hayward Air Terminal, CA21 mi47 minE 310.00 miMostly Cloudy57°F45°F64%1019.2 hPa
Half Moon Bay Airport, CA22 mi46 minESE 410.00 miOvercast54°F48°F82%1016.9 hPa
Novato / Gnoss Field, CA23 mi66 minS 310.00 miOvercast54°F48°F82%1017.9 hPa
San Carlos Airport, CA23 mi46 minN 05.00 miOvercast with Haze55°F50°F82%1018.3 hPa
Concord, Buchanan Field, CA23 mi48 minN 010.00 miOvercast56°F48°F77%1017 hPa

Wind History from OAK (wind in knots)
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Last 24hrCalmE3S3SW4W4W7W7W6NW6NW4W4NW5CalmCalmCalmSE3E4CalmCalmNE3S3CalmNE3Calm
1 day agoN4CalmSW3W6W8W8W10NW11NW9NW5NW4CalmE3NE3NE3E3NE4NE4NE3CalmNE4CalmNE3Calm
2 days agoCalmNE5CalmNW7NW7NE9NE8N11N13N11NE11NE6NE7E6NE4CalmCalmCalmNE4NE4NE4E4NE4NE5

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Mon -- 01:26 AM PST     4.66 feet High Tide
Mon -- 06:09 AM PST     2.76 feet Low Tide
Mon -- 06:55 AM PST     Sunrise
Mon -- 08:42 AM PST     Moonrise
Mon -- 12:04 PM PST     5.74 feet High Tide
Mon -- 04:54 PM PST     Sunset
Mon -- 06:52 PM PST     -0.34 feet Low Tide
Mon -- 06:55 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.24.64.64.23.632.82.93.44.14.95.55.75.54.73.520.7-0.1-0.300.81.72.7

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Mon -- 02:39 AM PST     -0.00 knots Slack
Mon -- 04:45 AM PST     -1.33 knots Max Ebb
Mon -- 06:55 AM PST     Sunrise
Mon -- 07:49 AM PST     0.00 knots Slack
Mon -- 08:42 AM PST     Moonrise
Mon -- 10:36 AM PST     1.81 knots Max Flood
Mon -- 01:39 PM PST     -0.00 knots Slack
Mon -- 04:52 PM PST     -2.62 knots Max Ebb
Mon -- 04:54 PM PST     Sunset
Mon -- 06:55 PM PST     Moonset
Mon -- 08:33 PM PST     0.00 knots Slack
Mon -- 11:39 PM PST     2.64 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.61.90.8-0.4-1.2-1.3-1-0.50.111.71.81.40.6-0.3-1.4-2.3-2.6-2.2-1.5-0.60.61.82.5

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 (10,2,3,4)
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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.