Sunday, August20, 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 6:29AMSunset 7:56PM Sunday August 20, 2017 12:59 AM PDT (07:59 UTC) Moonrise 4:14AMMoonset 6:24PM Illumination 4% Phase: Waning Crescent; Moon at 28 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- 846 Pm Pdt Sat Aug 19 2017
Tonight..W winds 5 to 15 kt. Patchy fog after midnight.
Sun..NW winds 10 kt...becoming W 10 to 20 kt in the afternoon. Patchy fog in the morning.
Sun night..NW winds 5 to 15 kt. Patchy fog after midnight.
Mon..NW winds 10 to 20 kt. Patchy fog in the morning.
Mon night..NW winds 10 to 20 kt. Patchy fog after midnight.
Tue..SW winds 10 kt. Patchy fog.
Wed..SW winds 10 kt.
Thu..SW winds 10 kt.
PZZ500 846 Pm Pdt Sat Aug 19 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwest winds will continue across the northern outer waters tonight as high pressure builds in from the west. Winds are forecast to decrease below small craft advisory criteria by Sunday evening. In addition to breezy winds, locally steep wind waves will also continue tonight and into Sunday.

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 200529
afdmtr
area forecast discussion
national weather service san francisco bay area
1029 pm pdt Sat aug 19 2017

Synopsis A few degrees of cooling are expected over the
weekend and into early next week as an approaching trough of low
pressure weakens the area of high pressure currently over the
eastern pacific. Coastal areas will see little in the way of
change with continue night and morning low clouds and patchy fog.

Discussion As of 7:50 pm pdt Saturday... An upper level trough
will continue to move in from the northwest and merge with another
nearly stationary low located along the central coast. Highs today
were fairly comfortable most places with only far inland locations
experiencing warm to hot temperatures as a ridge continues to be
replaced by an upper level trough. Northerly flow continues to
bring wildfire smoke in from the north and marine based clouds and
fog are widespread over the coastal waters. Onshore winds will
usher low clouds and fog inland each night and morning this week.

Cloud coverage Monday morning will be challenging to predict much
depending upon the depth and strength of the marine layer, though
of course, the farther inland one is the better chances there are
for clear skies. Some high clouds may also be over the area during
the solar eclipse. Going forecast looks good, for additional details
please see the previous discussion.

Prev discussion As of 1:25 pm pdt Saturday... Today's stratus has
been a bit slower to mix out compared to yesterday. Visible
satellite shows clouds along entire coastline from sonoma county
south through monterey county, and even some clouds pushing
through the golden gate east into berkeley. For the next several
hours, we have one of the two goes-16 mesoscale sectors over parts
of the pacnw with its southern extent covering the san francisco
bay area. With this mesoscale sector, we are able to get detailed
satellite imagery once every minute. It's fascinating to watch
this minute-by-minute data with the clouds gradually mixing out
over the bay combined with the continued push through the golden
gate gap. Check out @nwsbayarea on twitter to see it for yourself!
synoptically-speaking an upper level low is centered just over a
hundred miles offshore from los angeles. This low will help to
enhance potential thunderstorm activity over the next few days for
parts of southern california as well as the sierra nevada. For us
along the central coast and for the san francisco bay area, we're
a bit too far north to expect any sort of convective activity.

Nonetheless, the low is close enough to bring a gradual cooling
trend across interior areas of the san francisco bay area, san
benito county, and interior monterey county through the weekend.

This checks out for today as temperatures for most airports in the
area are running a few degrees below what they were 24 hours ago.

When all is set and done this afternoon, expect highs to
generally reach the 60s along the coast and the middle 70s to low
90s for interior areas. Little change is expected for highs on
Sunday along the immediate coast, but an additional 2 to 5
degrees of cooling is likely inland. Minimal day-to-day changes
are anticipated for the entire area for much of next week.

The cloud cover forecast for Monday continues to be a bit of a
challenge. If conditions permit, a partial solar eclipse can be
viewed throughout california while the total eclipse can be viewed
north in oregon. Models remain in good agreement that the upper
level low will remain parked near point conception in southern
california. Current thinking is that there will be cloud cover
along the coast on Monday morning. The big questions are 1) how
far inland will these clouds be, and 2) will areas with morning
clouds clear early enough to see the eclipse? We cannot
confidently answer these questions quite yet. Another potential
outcome (not likely, but still possible) is that the upper low
could end up mixing out the marine layer, allowing for mostly
clear conditions for much of the area. We will continue to monitor
the marine layer's behavior over the next 48 hours to see how it
responds to this upper low. The marine layer depth has trended
upward from 1,200 ft to 2,000 ft over the past day. Climatologically-
speaking, the best locations in the bay area for clear skies on a
mid late august morning would be interior areas of the east bay
away from the coast, as well as the higher elevations in the santa
cruz mountains, north bay mountains, and diablo range. The
eclipse of the Sun will begin shortly after 9:00 am pdt for the
bay area with peak obscuration happening around 10:15 am pdt. Peak
obscuration of the Sun will range from 71 percent in monterey and
up to 78 percent in santa rosa.

Aviation As of 10:29 pm pdt Saturday... The marine layer depth
has ramped up to nearly 2500 feet per the fort ord profiler, and
coastal stratus is spreading into inland valleys. All terminals
are expected to see MVFR ifr CIGS tonight with late morning burn
off.

Vicinity of ksfo...VFR early, ifr CIGS expected by 08z with
clearing by 18z. Afternoon sea breeze winds up to 15 kts expected.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... MVFR CIGS becoming ifr CIGS by 09z.

Clearing after 18z.

Marine As of 10:24 pm pdt Saturday... Moderate northwest winds
will continue across the northern outer waters tonight as high
pressure builds in from the west. Winds are forecast to decrease
below small craft advisory criteria by Sunday evening. In
addition to breezy winds, locally steep wind waves will also
continue tonight and into Sunday.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
public forecast: canepa
aviation: sims
marine: sims
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi48 min WSW 8.9 G 12 58°F 60°F1012.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi48 min W 5.1 G 9.9 60°F 1010.7 hPa
PXSC1 3 mi42 min 61°F 58°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi53 min W 2.9 59°F 1012 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi42 min WSW 8.9 G 13 61°F 1011.8 hPa
OBXC1 6 mi42 min 61°F 59°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi42 min WSW 15 G 17
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi42 min SW 19 G 21 61°F 1011.8 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi48 min SSW 8.9 G 11 60°F 65°F1011.6 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi42 min WNW 6 G 8.9 61°F 68°F1012.3 hPa
LNDC1 9 mi42 min W 8.9 G 13 61°F 1011.8 hPa
46237 - San Francisco Bar, CA (142) 11 mi60 min 60°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi42 min WSW 16 G 19 61°F 1010.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi70 min SSW 5.8 G 7.8 57°F 59°F5 ft1012.2 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi42 min W 12 G 14 61°F 69°F1011.3 hPa59°F
RTYC1 - 9414523 - Redwood City, CA 25 mi42 min S 2.9 G 5.1 64°F 73°F1011.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi42 min WSW 18 G 23 61°F 69°F1010.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi42 min ESE 7 G 12 60°F 60°F1011.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi42 min WNW 15 G 19 64°F 1009.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi135 min WNW 15 61°F 1009 hPa57°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi70 min WSW 1.9 G 7.8 59°F 62°F8 ft1012 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 mi2.1 hrsS 610.00 miA Few Clouds66°F55°F68%1011.4 hPa
Oakland, Metro Oakland International Airport, CA15 mi67 minWNW 310.00 miPartly Cloudy60°F57°F93%1011.6 hPa
Hayward, Hayward Air Terminal, CA21 mi66 minW 710.00 miMostly Cloudy63°F55°F76%1012.4 hPa
Half Moon Bay Airport, CA22 mi65 minS 89.00 miOvercast59°F57°F94%1011.8 hPa
Novato / Gnoss Field, CA23 mi85 minN 010.00 miOvercast57°F53°F88%1011.8 hPa
San Carlos Airport, CA23 mi70 minN 010.00 miPartly Cloudy63°F57°F83%1011.8 hPa
Concord, Buchanan Field, CA23 mi67 minVar 510.00 miFair62°F57°F84%1009.4 hPa

Wind History from OAK (wind in knots)
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Last 24hrNW7W6NW3N3N4CalmCalmNW7NW6NW8NW7NW8NW13NW14NW10W13W9W13W12W7W6W6NW3W4
1 day agoNW7NW7W9W8W7W6W5W4S4CalmW7NW12W15W15NW12NW15NW14NW13NW12NW10NW8NW6NW7NW10
2 days agoN3N6N6N4N3CalmN5NW3W4NW8W10W13NW10NW11NW14W16NW16NW12W13W12W10W10W10W9

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Sun -- 05:14 AM PDT     Moonrise
Sun -- 05:19 AM PDT     -0.74 feet Low Tide
Sun -- 06:29 AM PDT     Sunrise
Sun -- 12:18 PM PDT     5.40 feet High Tide
Sun -- 05:16 PM PDT     2.06 feet Low Tide
Sun -- 07:23 PM PDT     Moonset
Sun -- 07:55 PM PDT     Sunset
Sun -- 11:27 PM PDT     6.78 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
64.72.91.2-0.1-0.7-0.60.11.22.43.74.85.45.24.53.52.52.12.22.93.95.16.16.7

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Sun -- 12:04 AM PDT     -0.00 knots Slack
Sun -- 03:15 AM PDT     -3.14 knots Max Ebb
Sun -- 05:14 AM PDT     Moonrise
Sun -- 06:29 AM PDT     Sunrise
Sun -- 06:51 AM PDT     0.00 knots Slack
Sun -- 10:02 AM PDT     3.46 knots Max Flood
Sun -- 01:28 PM PDT     -0.01 knots Slack
Sun -- 03:53 PM PDT     -1.82 knots Max Ebb
Sun -- 06:51 PM PDT     0.01 knots Slack
Sun -- 07:23 PM PDT     Moonset
Sun -- 07:55 PM PDT     Sunset
Sun -- 09:49 PM PDT     2.82 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.1-1.3-2.6-3.1-3-2.3-1.30.323.13.53.22.30.8-0.7-1.6-1.8-1.5-0.90.21.62.62.82.4

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 (3,6,7,8)
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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.