Tuesday, April24, 2018 L-36.com


Marine Weather and Tides
San Francisco, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:19AMSunset 7:55PM Tuesday April 24, 2018 5:26 AM PDT (12:26 UTC) Moonrise 1:31PMMoonset 2:33AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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- 214 Am Pdt Tue Apr 24 2018
Today..SW winds 5 to 15 kt...becoming 10 to 15 kt with gusts up to 25 kt this afternoon.
Tonight..SW winds 5 to 15 kt.
Wed..SW winds 10 to 20 kt with gusts up to 25 kt.
Wed night..SW winds 10 to 20 kt with gusts up to 30 kt.
Thu..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu night..W winds 10 to 20 kt with gusts up to 25 kt.
Fri..SW winds 5 to 15 kt.
Sat..W winds 5 to 15 kt.
PZZ500 214 Am Pdt Tue Apr 24 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light onshore winds through the work week, with locally breezy to gusty winds near coastal gaps or prominent points such as the golden gate bridge and point sur. Light to moderate seas will prevail through the forecast period with a mixed southerly and northwesterly swell developing late this week.

7 Day Forecast for Marine Location Near San Francisco, CA
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location: 37.81, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 241149
afdmtr
area forecast discussion
national weather service san francisco bay area
449 am pdt Tue apr 24 2018

Synopsis A cooling trend is forecast from Tuesday through the
end of the week as an area of low pressure offshore slowly
approaches the coast. This low pressure may produce widely scattered
showers from late Friday into Saturday, mainly from the san
francisco bay north. Temperatures will be cool through the weekend
and early next week.

Discussion As of 3:00 am pdt Tuesday... An upper level trough
that moved inland north of the state on Sunday has brought onshore
flow to the area which has allowed low clouds to spread around the
bay this morning. Forecast high temperatures have been adjusted
lower around the bay area for today to account for the 1500 foot
marine layer and the onshore gradients. Wednesday should be a
continuation of today with more night and morning low clouds
around the bay.

An upper level low currently near 40 137 will drift slowly
eastward over the next few days. This will deepen the marine layer
even more Thursday and Friday resulting in a cooling trend for all
areas including the interior valleys. Models are indicating
stratus may spread into the north and east bay interior valleys
Thursday night and Friday morning. The marine layer will
eventually mix out but cooler air will continue to advect into the
area as the low gets closer to the coast. There is remarkably
good agreement with the gfs ECMWF and canadian models in bringing
the low into northern california Friday night and Saturday.

Showers will be limited due to lack of moisture so the main
effects will be the cool temperatures. The forecast mentions a
slight chance of showers from the bay area north Friday night and
Saturday. Highs Friday and Saturday only in the 60s in the bay
area and low 70s in the inland valleys.

As the low moves inland models indicate a secondary upper level
disturbance pinwheeling around the upper low and racing through
the area on Sunday. Again shower chances will be very minimal but
it will keep the cool temperatures going into Monday.

Temperatures will start to warm back up the middle of next week as
an upper level ridge builds along the west coast.

Aviation As of 4:45 am pdt Tuesday... Stratus deck W cigs
400-1200 ft this morning as thermal trof lingers inland tightening
the onshore gradient. Gradient will weaken into the sunrise hours
allowing for a gradual burn off from the edges by 16-18z depending
on location. Otherwise, light to locally breezy (near coastal
gaps) onshore winds today with passing high clouds at or around
20000 ft. Another round of stratus, possibly thicker lower,
anticipated to begin again overnight tonight.

Vicinity of ksfo... Borderline ifr MVFR thru 16z posbl with some
sct- bkn clouds impacting approach into the 17z hour. Breezy pm
w-nw wind with a few more gusts to 20 knots possible later today.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr lifr into sunrise hours with a few
areas of lingering stratus into the mid morning around the lip of
the monterey bay. Light onshore winds this afternoon and evening.

Stratus and fog are likely to roll back inland early Tuesday
evening.

Marine As of 04:42 am pdt Tuesday... Generally light onshore
winds through the work week, with locally breezy to gusty winds
near coastal gaps or prominent points such as the golden gate
bridge and point sur. Light to moderate seas will prevail through
the forecast period with a mixed southerly and northwesterly
swell developing late this week.

Mtr watches warnings advisories
Tday None.

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

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi44 min WSW 5.1 G 8.9 52°F 55°F1015.8 hPa
PXSC1 2 mi38 min 54°F 51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi38 min W 6 G 8 53°F 1014.5 hPa
OBXC1 5 mi38 min 54°F 52°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi45 min Calm 51°F 1016 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi38 min NW 1.9 G 2.9 53°F 1015.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi38 min SW 4.1 G 5.1
AAMC1 - 9414750 - Alameda, CA 8 mi44 min W 4.1 G 6 53°F 63°F1015.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi38 min SSW 5.1 G 8 53°F 1015.8 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi50 min SSW 2.9 G 6 53°F 58°F1015.4 hPa
LNDC1 8 mi38 min WSW 2.9 G 5.1 54°F 1015.4 hPa
46237 - San Francisco Bar, CA (142) 10 mi56 min 54°F4 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi38 min WNW 6 G 8.9 55°F 1015.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi36 min WNW 1.9 G 3.9 51°F 53°F5 ft1015.5 hPa (-1.3)
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi38 min W 11 G 15 54°F 61°F1015.2 hPa54°F
RTYC1 - 9414523 - Redwood City, CA 24 mi38 min Calm G 2.9 55°F 66°F1015.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi38 min WSW 13 G 18 54°F 62°F1014.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi38 min SE 1 G 2.9 57°F1015.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi38 min WNW 13 G 17 55°F 1013.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi101 min W 7 52°F 1014 hPa51°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 39 mi36 min WSW 1.9 G 3.9 52°F 55°F5 ft1015.2 hPa (-1.1)

Wind History for San Francisco, 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, CA14 mi90 minW 510.00 miMostly Cloudy54°F48°F80%1015.6 hPa
Oakland, Metro Oakland International Airport, CA14 mi33 minNNW 38.00 miOvercast54°F51°F90%1015.5 hPa
Hayward, Hayward Air Terminal, CA20 mi32 minNNW 49.00 miOvercast56°F48°F75%1016.3 hPa
Half Moon Bay Airport, CA21 mi31 minS 36.00 miFog/Mist50°F48°F94%1015.9 hPa
San Carlos Airport, CA22 mi31 minSE 510.00 miOvercast55°F51°F88%1015.6 hPa
Novato / Gnoss Field, CA24 mi51 minN 010.00 miOvercast50°F48°F94%1015.6 hPa
Concord, Buchanan Field, CA24 mi33 minW 58.00 miFair53°F48°F86%1013.7 hPa

Wind History from SFO (wind in knots)
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Last 24hrW6W5W6SW5CalmN5E4NE4N4NW14W17W18W18W19W18W19W14NW11W11W7NW4NW4W5W5
1 day agoW9W3W7NW6NE3NE3NE4NE3NW5W11NW13W18W14W18W15NW14NW12NW12W9W8W7W8W7W7
2 days agoW5W5CalmCalmE6E4NE5NE3NE4NE4NW13W18W20W23W18W22W13W16W12NW11W10W11W8W6

Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Tue -- 01:40 AM PDT     2.27 feet Low Tide
Tue -- 03:33 AM PDT     Moonset
Tue -- 06:22 AM PDT     Sunrise
Tue -- 07:25 AM PDT     5.00 feet High Tide
Tue -- 01:59 PM PDT     -0.17 feet Low Tide
Tue -- 02:30 PM PDT     Moonrise
Tue -- 07:54 PM PDT     Sunset
Tue -- 09:13 PM PDT     5.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.82.42.32.63.23.94.654.94.33.320.90.1-0.20.10.81.72.83.94.85.25.14.4

Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
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Alcatraz Island S
Click for Map
Tue -- 03:29 AM PDT     0.01 knots Slack
Tue -- 03:33 AM PDT     Moonset
Tue -- 06:22 AM PDT     Sunrise
Tue -- 06:25 AM PDT     1.10 knots Max Flood
Tue -- 08:56 AM PDT     -0.01 knots Slack
Tue -- 12:00 PM PDT     -2.30 knots Max Ebb
Tue -- 02:30 PM PDT     Moonrise
Tue -- 03:55 PM PDT     0.00 knots Slack
Tue -- 07:23 PM PDT     1.81 knots Max Flood
Tue -- 07:53 PM PDT     Sunset
Tue -- 10:18 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.4-1.3-1-0.40.30.81.110.7-0.1-1.2-2-2.3-2.1-1.7-10.10.91.51.81.71.20.3-0.8

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 (8,2,3,4)
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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.