Saturday, October21, 2017 L-36.com


Marine Weather and Tides
South San Francisco, 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 7:23AMSunset 6:24PM Saturday October 21, 2017 8:37 AM PDT (15:37 UTC) Moonrise 8:05AMMoonset 6:58PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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- 304 Am Pdt Sat Oct 21 2017
Today..W winds 10 kt.
Tonight..NW winds 10 kt.
Sun..NW winds 10 kt.
Sun night..W winds 5 kt.
Mon..N winds 5 kt.
Tue..N winds 5 kt.
Wed..NE winds 5 kt...becoming sw.
PZZ500 304 Am Pdt Sat Oct 21 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the central california coast will weaken tonight and Sunday as a frontal system moves into the pacific northwest. The high will strengthen and build northward Sunday night and Monday after the front passes. A long period northwest swell will continue to taper down through the day.

7 Day Forecast for Marine Location Near South San Francisco, CA
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location: 37.65, -122.36     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211515
afdmtr
area forecast discussion
national weather service san francisco bay area
815 am pdt Sat oct 21 2017

Synopsis A warming trend will begin over the weekend and
continue into early next week. Much warmer and drier conditions
are expected to develop by Monday and Tuesday. Slight cooling is
likely during the second half of the week, but temperatures will
remain well above seasonal averages.

Discussion As of 08:05 am pdt Saturday... A cool start to the
morning with widespread temperatures being reported in the 40s
with a few middle upper 30s in parts of the north bay valleys.

Otherwise, mainly clear skies prevail region-wide with a few to
scattered high clouds streaming inland over the region. The
forecast remains on track for a slight warming trend this
afternoon before a more robust warm-up gets underway Sunday
through Tuesday as high pressure builds over the region. Please
see the previous forecast discussion below for additional details
as no major forecast updates are needed at this time.

Prev discussion As of 3:30 am pdt Saturday... Quiet night
across our region today with cool temperatures (mostly in the 40s
to the lower 50s) that are running 5 to 10 degrees cooler than
this time yesterday. Drier air is also in place with dew points in
the 40s. Only real question is if fog will form before sunrise.

Best bet is in the north bay -- santa rosa is currently at 100% rh
-- so will leave it in the forecast for that region. Today should
be generally sunny with slightly warmer temperatures as a ridge
of high pressure off the coast builds toward our region. Highs
will be in the mid 60s to the lower 70s.

Temperatures will continue to trend warmer into next week as the
ridge expands and builds into the southwestern conus. This has
been a change in the synoptic pattern that has been advertised for
over a week by the models. Latest guidance has 500 mb heights at
or above 595 dm for Monday and Tuesday. At the same time 925 mb
temperatures will be in the 25-30c range which would put it close
to some of the highest values ever for the entire month of
october. With winds forecast to be offshore, very warm
temperatures will make its way across our entire region --
including local beaches. Highs will be in the 80s to mid 90s.

Records will likely fall. Overnight lows will remain cool
providing relief from the daytime heat.

After that we see a large divergence with solutions. The GFS has a
system dropping into the great plains with the ridge rex block
focused more to the northwest of our area. On the other hand the
ecmwf shows that on Wednesday the ridge will flatten while a
system dives southward from british columbia into the interior
northwest. This system will continue into eastern nevada four
corners region late on Thursday. If this solution verifies it will
lead to gusty northerly winds particularly for the north bay
mountains and east bay hills. ECMWF already has 925 mb speeds
forecast to exceed 30 kt. Although this is still a few days out,
we will be keeping a very close eye on it to see where the system
will end up. If the GFS is correct it will be a non-event.

No indication of rain through halloween.

Aviation As of 4:30 am pdt Saturday... Satellite image is
partially obscured by high clouds but indications are stratus is
nil or patchy at the coast.VFR conditions today but there could
see some vsbys down to 3-5 miles through 16z in the north bay as
the ground may still be saturated from the recent rain.

Vicinity of ksfo...VFR. West winds 13-15 kt after 21z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR.

Fire weather As of 5:30 am pdt Saturday... Gradual warming
trend starts today with light northerly winds. This trend
continues into tomorrow with winds turning more to the northeast
with continued warming and drying. Another round of gusty offshore
winds is forecast for the napa hills Sunday night into Monday
morning. Recent rain has helped but will need to watch the Sunday
night into Monday morning wind event closely. Long range trends
suggest warm to hot afternoons and very dry conditions with
periods of offshore winds for much of next week.

There is also concern about a potential northerly wind event for
the north and east bay hills late Thursday into Friday.

Marine As of 3:30 am pdt Saturday... High pressure off the
central california coast will weaken tonight and Sunday as a
frontal system moves into the pacific northwest. The high will
strengthen and build northward Sunday night and Monday after the
front passes. A long period northwest swell will continue to taper
down through the day.

Mtr watches warnings advisories
Tday Sca... Rough bar advisory for sf bar until 3 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: rgass
aviation: W pi
marine: W pi
fire weather: bell
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi49 min NNW 2.9 G 6 53°F 61°F1024.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi55 min N 2.9 G 4.1 54°F 1022.9 hPa
OBXC1 11 mi49 min 54°F 46°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi49 min NNE 6 G 8 54°F 1023.9 hPa
PXSC1 11 mi49 min 56°F 48°F
LNDC1 11 mi49 min N 2.9 G 4.1 53°F 1023.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi49 min N 5.1 G 7
FTPC1 - 9414290 - San Francisco, CA 12 mi49 min SSW 2.9 G 2.9 51°F 56°F1024.3 hPa
RTYC1 - 9414523 - Redwood City, CA 13 mi49 min S 1.9 G 2.9 50°F 64°F1023.6 hPa
46237 - San Francisco Bar, CA (142) 17 mi67 min 56°F10 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi70 min Calm 52°F 1024 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi55 min N 7 G 8 53°F 1024.1 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi49 min NNW 6 G 7 53°F 58°F1023.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi47 min NNW 7.8 G 9.7 55°F 55°F10 ft1023.8 hPa (+1.4)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi55 min SE 1.9 G 4.1 51°F 1023.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi49 min NW 5.1 G 7 51°F 61°F1024.2 hPa47°F
PCOC1 - 9415144 - Port Chicago, CA 33 mi49 min S 7 G 8.9 49°F 62°F1023.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi47 min N 12 G 16 56°F 59°F13 ft1023.4 hPa (+1.2)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 37 mi55 min WNW 6 G 8 53°F 1023.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 41 mi49 min W 5.1 G 6 54°F1023.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi112 min N 2.9 44°F 1023 hPa42°F

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA2 mi41 minW 510.00 miPartly Cloudy53°F46°F80%1023.9 hPa
Oakland, Metro Oakland International Airport, CA8 mi44 minN 010.00 miPartly Cloudy46°F44°F93%1024.2 hPa
San Carlos Airport, CA10 mi50 minN 010.00 miA Few Clouds50°F44°F82%1024.4 hPa
Half Moon Bay Airport, CA12 mi42 minN 010.00 miFair45°F42°F93%1023.4 hPa
Hayward, Hayward Air Terminal, CA13 mi43 minENE 510.00 miFair48°F39°F74%1024.9 hPa
Palo Alto Airport, CA17 mi50 minW 510.00 miA Few Clouds46°F42°F87%1024.4 hPa
Mountain View, Moffett Field, CA22 mi41 minN 010.00 miFair50°F43°F77%1024.6 hPa

Wind History from SFO (wind in knots)
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Last 24hrW4SW4SW6NW7W9W12
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W15W18W14W15W16W18W17W11W11W8W9W7W7W6W5NW5W7
1 day agoW3SW4SW4SW5NW6SW11W13
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2 days ago--S5CalmE3E4N5NW14W19W21W17W17W15W12W6W10W11
G15
W7W5SW5W8W7W6W3W5

Tide / Current Tables for Oyster Point Marina, San Francisco Bay, California
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Oyster Point Marina
Click for Map
Sat -- 02:20 AM PDT     6.21 feet High Tide
Sat -- 07:24 AM PDT     Sunrise
Sat -- 07:52 AM PDT     1.91 feet Low Tide
Sat -- 09:04 AM PDT     Moonrise
Sat -- 01:51 PM PDT     7.00 feet High Tide
Sat -- 06:23 PM PDT     Sunset
Sat -- 07:58 PM PDT     Moonset
Sat -- 08:28 PM PDT     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.55.66.265.34.132.21.92.33.44.75.96.776.55.33.72.10.80.10.10.92.1

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Sat -- 02:40 AM PDT     -0.01 knots Slack
Sat -- 05:34 AM PDT     -1.19 knots Max Ebb
Sat -- 07:23 AM PDT     Sunrise
Sat -- 08:28 AM PDT     0.00 knots Slack
Sat -- 09:04 AM PDT     Moonrise
Sat -- 11:18 AM PDT     0.85 knots Max Flood
Sat -- 02:15 PM PDT     -0.00 knots Slack
Sat -- 05:45 PM PDT     -1.73 knots Max Ebb
Sat -- 06:23 PM PDT     Sunset
Sat -- 07:58 PM PDT     Moonset
Sat -- 09:01 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.80.4-0.2-0.8-1.1-1.1-0.8-0.30.20.60.80.80.60.1-0.5-1.2-1.6-1.7-1.4-0.8-00.50.9

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.