Wednesday, October17, 2018 L-36.com


Marine Weather and Tides
Belvedere, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:19AMSunset 6:29PM Wednesday October 17, 2018 3:23 AM PDT (10:23 UTC) Moonrise 2:05PMMoonset 12:00AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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 The San Francisco Bay North Of The Bay Bridge- 218 Am Pdt Wed Oct 17 2018
Today..E winds up to 10 kt...becoming sw this afternoon.
Tonight..SW winds 5 to 10 kt.
Thu..W winds up to 10 kt.
Thu night..SW winds 5 to 10 kt.
Fri..W winds up to 10 kt.
Fri night..SW winds 5 to 10 kt.
Sat..NW winds up to 10 kt.
Sun..W winds up to 10 kt.
PZZ500 218 Am Pdt Wed Oct 17 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Predominately light northwest winds through the the forecast period. Locall breezy northwest winds will develop through the usual coastal jets near the coast. A long period northwest swell will arrive on Wednesday bringing an increased risk of rip currents and sneaker waves. SWell period will decrease Wednesday night and Thursday.


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 170950
afdmtr
area forecast discussion
national weather service san francisco bay area
250 am pdt Wed oct 17 2018

Synopsis Daytime will remain seasonably warm with patchy
coastal clouds at night will continue the rest of the week and
into the weekend. The forecast remains dry through the middle of
next week. Cooler weather returns next week.

Discussion As of 02:50 am pdt Wednesday... Offshore flow
continues to weaken (sfo-wmc gradient down another 4mb) as
onshore flow increase. Overnight GOES east satellite fog product
shows a summer type set up with coastal low clouds pushing locally
inland. Automated stations puts cloud heights at only a few
hundred feet with patchy dense fog. Therefore, added some patchy
dense fog around monterey bay, san mateo coast and santa rosa
vicinity. Expect clearing back to the coast by mid-morning with
sunny skies this afternoon. Similar to yesterday morning, it will
be chilly with a few interior pockets dipping into the upper 30s.

The longwave pattern aloft will gradually evolve over the next few
days and moreso next week. Currently the upper low over northern
arizona will continue to drift to the NE as ridging builds across
the pac nw. By Friday, high pressure aloft becomes established
over or as low pressure develops over socal as a weak rex block
into the weekend. So what does this mean for the bay area? Mild
daytime temperatures with cool overnight temperatures. Night and
morning low clouds will be possible along the coast and locally
inland. Conf is low on extent of clouds as some weak offshore flow
remains. Above the cloud deck, dry conditions will remain over the
hills keeping fire weather concerns heightened.

The 00z model suite continues to advertise another pattern shift
next week. The blocking pattern is short lived as an upper level
trough moves into the west coast. Confidence on precip chances
continues to remain low, but one thing that is more certain is
widespread cooling. Current forecast will bring temperatures down
by Monday with increasing clouds and a low chance for precip
across the north bay.

Aviation As of 10:00 pm pdt Tuesday... Satellite image shows
areas of stratus over the waters. Stratus is filling mry bay and
should spread into mry and sns. Latest NAM guidance shows cigs
into sfo and oak early morning so have added that into the tafs.

Vicinity of ksfo... Occasional MVFR CIGS between 12z and 16z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS after 07z clearing after 17z.

Marine As of 09:33 pm pdt Tuesday... High pressure over the
eastern pacific coupled with a thermal trough along the coast will
maintain light northwest winds through Sunday. A long period
northwest swell will arrive on Wednesday bringing an increased
risk of rip currents and sneaker waves. Swell period will decrease
Wednesday night and Thursday.

Mtr watches warnings advisories
Tday None.

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

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi36 min SW 5.1 G 7 61°F1018.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi36 min WSW 5.1 G 9.9 55°F 1017.1 hPa
PXSC1 3 mi36 min 57°F 55°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi43 min W 2.9 54°F 1018 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi36 min WNW 4.1 G 6 56°F 1018.2 hPa
OBXC1 6 mi36 min 56°F 54°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi36 min WNW 2.9 G 5.1
RCMC1 - 9414863 - Richmond, CA 7 mi36 min WSW 4.1 G 6 63°F1018 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi48 min SSW 8.9 G 12 57°F 1018.3 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi36 min WNW 5.1 G 6 64°F1018.4 hPa
LNDC1 9 mi36 min W 1.9 G 4.1 56°F 1018.1 hPa
46237 - San Francisco Bar, CA (142) 11 mi54 min 59°F3 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi36 min WSW 7 G 11 57°F 1017.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi36 min WNW 9.9 G 12 57°F 64°F1017.7 hPa57°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi34 min WNW 9.7 G 12 56°F 58°F3 ft1018.7 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi36 min SSW 1.9 G 1.9 54°F 67°F1018.7 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi36 min WSW 9.9 G 12 57°F 64°F1017.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi36 min W 4.1 G 7 59°F1017.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi36 min WNW 7 G 8 58°F 1017.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi99 min W 2.9 55°F 1017 hPa

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 mi28 minWNW 910.00 miA Few Clouds53°F50°F89%1018 hPa
Oakland, Metro Oakland International Airport, CA15 mi31 minNW 510.00 miA Few Clouds54°F52°F93%1018.2 hPa
Hayward, Hayward Air Terminal, CA21 mi30 minENE 310.00 miFair53°F44°F72%1019 hPa
Novato / Gnoss Field, CA23 mi29 minN 010.00 miMostly Cloudy46°F42°F87%1017.9 hPa
San Carlos Airport, CA23 mi29 minN 010.00 miFair54°F48°F82%1018.3 hPa
Concord, Buchanan Field, CA23 mi31 minN 010.00 miFair52°F44°F75%1016.4 hPa

Wind History from SFO (wind in knots)
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Last 24hrSW5SW3SW3W6SW3CalmNE3NE3E4NE4NW8NW11NW14W19W16W15
G22
NW10NW9--W8W12W10W9W9
1 day agoE12E8E15E10SE6SE8SE7SE10SE7SE5CalmCalmN4W12W16W15W13NW7NW6NW6W5NW5W4S6
2 days agoW3S4S6S7S8SW73NE4NE4NE3NW8NW10NW12W17W19W15W13W11W8S3W4S3NE13E9

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Wed -- 12:29 AM PDT     Moonset
Wed -- 12:53 AM PDT     0.71 feet Low Tide
Wed -- 07:20 AM PDT     Sunrise
Wed -- 08:32 AM PDT     4.63 feet High Tide
Wed -- 01:46 PM PDT     2.97 feet Low Tide
Wed -- 03:04 PM PDT     Moonrise
Wed -- 06:29 PM PDT     Sunset
Wed -- 06:57 PM PDT     4.69 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.70.91.42.12.93.74.24.64.64.33.93.43.133.23.64.14.54.74.53.93.12.2

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Wed -- 12:29 AM PDT     Moonset
Wed -- 02:27 AM PDT     0.01 knots Slack
Wed -- 05:49 AM PDT     2.05 knots Max Flood
Wed -- 07:20 AM PDT     Sunrise
Wed -- 09:14 AM PDT     -0.00 knots Slack
Wed -- 11:25 AM PDT     -0.92 knots Max Ebb
Wed -- 02:57 PM PDT     0.00 knots Slack
Wed -- 03:04 PM PDT     Moonrise
Wed -- 05:33 PM PDT     1.15 knots Max Flood
Wed -- 06:29 PM PDT     Sunset
Wed -- 08:27 PM PDT     -0.00 knots Slack
Wed -- 11:28 PM PDT     -1.81 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.5-1.1-0.40.61.51.921.81.20.2-0.6-0.9-0.9-0.8-0.500.71.11.10.90.4-0.4-1.3-1.8

Weather Map and Satellite Images
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wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (6,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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.