Thursday, March23, 2017 L-36.com


Marine Weather and Tides
San Francisco, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:05AMSunset 7:26PM Thursday March 23, 2017 1:15 AM PDT (08:15 UTC) Moonrise 3:26AMMoonset 2:01PM Illumination 19% Phase: Waning Crescent; Moon at 25 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- 847 Pm Pdt Wed Mar 22 2017
Tonight..W winds 10 to 20 kt.
Thu..W winds 5 to 15 kt.
Thu night..S winds 10 to 20 kt. Slight chance of rain in the evening, then chance of rain after midnight.
Fri..S winds 15 to 25 kt. Rain.
Fri night..SW winds 5 to 15 kt. Rain likely in the evening, then chance of showers after midnight.
Sat..W winds 5 to 15 kt.
Sun..SW winds 10 kt. Chance of showers.
Mon..W winds 10 kt...increasing to 10 to 20 kt. Chance of showers.
PZZ500 847 Pm Pdt Wed Mar 22 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 southern california coast will weaken tonight resulting in decreasing northwest winds. The winds will become southerly and increase on Thursday a ahead of the next system. Winds will increase during the day Thursday. Winds will switch to the northwest Friday but another system may impact the waters on Sunday.

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 230518
afdmtr
area forecast discussion
national weather service san francisco bay area
1018 pm pdt Wed mar 22 2017

Synopsis Clearing and drying trend overnight through Thursday.

Widespread rainfall and stronger winds return to the northern
portion of the region late Thursday night and will spread
southward during the day Friday. Dry conditions return for most of
Saturday with another weather system forecast to push through
starting Sunday night into Monday.

Discussion As of 9:00 pm pdt Wednesday... As expected shower
activity quickly winding down as the Sun has set. Still a stray
shower or two on radar but those should end before midnight.

Thursday still looks on track to be our break day with some
sunshine and seasonably cool highs in the lower 60s.

00z NAM and GFS look on track with the next storm bringing rain
into the north bay about 24 hours from now. Then the front will
slowly shift southward Thursday night into Friday setting the
stage for a wet Friday morning commute. The rain wont reach the
central coast until Friday afternoon and evening but then drop
steady rains from the santa cruz mountains southward to the santa
lucia range of big sur as an upper wave and surface low develop
along the boundary and slow its southward progression. QPF numbers
remain on track as described below. Precip ends in the north bay
Friday night but showers linger from the golden gate southward
until about 12z Saturday.

Saturday looks to be a dry and cool day (not too different than we
are expecting for Thursday). Models have been hinting that the
next storm due to arrive late Sunday could be trending stronger as
well but the 00z GFS and ECMWF have not arrived. If the trends
hold true we'll see another cold and wet storm to wind out the
weekend and start the work week. The system looks cold with not as
much moisture as the Friday system. Behind that things should dry
out for a while.

Prev discussion As of 3:00 pm pdt Wednesday... Kmux radar shows
scattered showers continuing across our region -- especially for
the southern third of the cwa. Returns indicate a few moderate
cells so would expect a few are dropping small hail. Showers will
greatly diminish once the Sun GOES down, and additional
accumulations will mostly be under a tenth.

Dry weather will return for tonight through the majority of
Thursday before another system from the north moves through and
brings widespread rainfall back into the picture. Models have been
advertising this system for nearly a week and the latest guidance
has only slightly wavered from previous runs. Now looks like rain
will move into the north bay Thursday night, down to sf bay Friday
morning and to monterey bay starting around noon. However, the
main story will be the moderate to heavy band of rain associated
with a surface front that will go through later than the initial
round of rain. That band could produce high rain rates for a brief
period possibly leading to some urban and small stream issues. At
the same time southerly winds will be on the increase as the front
approaches. Gusts in many urban locations of 25 to 35 mph can be
expected. Values to 50 mph are possible above 1,500 feet. Guidance
has slightly trended downward so at this time do not expect to
issue wind advisories.

Rainfall amounts have only slightly changed from previous forecast
packages. Still looks that the best ivt numbers (and longest
duration) will focus on the north bay with widespread 1.5-3"
expected (locally 4+" for the north bay mountains). Similar values
can be expected for the sc mountains plus the santa lucias.

Around sf bay generally 2/3" to 1.5" is forecast with mostly less
than 2/3" from the santa clara valley southward.

Behind the front scattered showers are possible into early
Saturday. This will be followed quickly by another system that
will again move north-to-south late Saturday night through
Sunday. This feature will be the weakest of the week and rainfall
totals should be generally under 1/2" for most urban locations.

A ridge of high pressure will build behind that system and bring
warmer and drier conditions back to our region for most of next
week and possibly through the following week.

Aviation As of 10:30 pm pdt Wednesday... A fairly moist boundary
layer will allow scattered clouds to form overnight. Patchy MVFR cigs
possible through 16z.

Vicinity of ksfo...VFR. West winds 15-20 kt decreasing after 09z.

Sct020 12z-16z but cannot rule out a brief cig at bkn020.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals... Low clouds over the hills will spill over
into mry and possibly sns through 15-16z.

Marine As of 08:50 pm pdt Wednesday... High pressure off the
southern california coast will weaken tonight resulting in
decreasing northwest winds. The winds will become southerly and
increase on Thursday a ahead of the next system. Winds will
increase during the day Thursday. Winds will switch to the
northwest Friday but another system may impact the waters on
Sunday.

Mtr watches/warnings/advisories
Tday Sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm until 3 am
gla... Pt arena to pigeon pt 10-60 nm from 9 am
sca... Pt pinos to pt piedras blancas 0-10 nm until 9 am
sca... Pt arena to pt reyes 0-10 nm from 3 pm
public forecast: rww
aviation: W pi
marine: W pi
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi46 min SW 4.1 G 7 51°F 56°F1020.9 hPa
PXSC1 2 mi46 min 53°F 42°F
OBXC1 5 mi46 min 53°F 43°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi46 min WNW 9.9 G 12
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi46 min NW 9.9 G 14 53°F 1020.7 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi46 min NW 8.9 G 12 52°F 58°F1020.2 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi46 min W 6 G 9.9 53°F 61°F1020.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi46 min NW 8 G 13 53°F 1020.7 hPa
LNDC1 8 mi52 min NW 8 G 14 53°F 1020.5 hPa
46237 - San Francisco Bar, CA (142) 10 mi106 min 55°F9 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi46 min W 4.1 G 8.9 52°F 1020.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi86 min NW 19 G 23 53°F 55°F9 ft1020.7 hPa (+1.3)
UPBC1 23 mi46 min WNW 11 G 18
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi46 min WNW 16 G 20 52°F 58°F1020.3 hPa47°F
RTYC1 - 9414523 - Redwood City, CA 24 mi46 min WNW 12 G 15 53°F 59°F1020.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi46 min W 14 G 18 51°F 58°F1020 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi46 min WNW 19 G 22 53°F 55°F1020.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi46 min W 9.9 G 14 51°F 1019.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi91 min WNW 6 46°F 1019 hPa44°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 39 mi86 min NW 19 G 21 53°F 55°F9 ft1020.9 hPa (+1.3)

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 mi80 minWNW 16 G 2210.00 miPartly Cloudy53°F43°F69%1020.7 hPa
Oakland, Metro Oakland International Airport, CA14 mi23 minNW 810.00 miA Few Clouds52°F45°F77%1020.5 hPa
Hayward, Hayward Air Terminal, CA20 mi22 minNNW 610.00 miA Few Clouds52°F39°F64%1021.6 hPa
Half Moon Bay Airport, CA21 mi21 minNW 17 G 219.00 miOvercast52°F46°F82%1021.3 hPa
San Carlos Airport, CA22 mi21 minWNW 11 G 1510.00 miPartly Cloudy52°F44°F77%1021 hPa
Novato / Gnoss Field, CA24 mi21 minW 9 G 1410.00 miFair50°F41°F71%1020.7 hPa
Concord, Buchanan Field, CA24 mi23 minW 510.00 miFair50°F42°F74%1019 hPa

Wind History from SFO (wind in knots)
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Last 24hrS9SW9S4W8W12W8W6W11NW9W10NW15NW14
G18
W14W17W16W16
G24
W20W20W15
G23
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1 day agoSE12SE8E9SE11
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S9S9--S14SE13
2 days agoW7W3CalmS12
G17
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G23
SE9SE9SE9SE11SE13SE12SE13SE11SE10SE12SE11SE13SE15SE7SE7SE7E4S8SE8

Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Thu -- 02:51 AM PDT     2.65 feet Low Tide
Thu -- 04:25 AM PDT     Moonrise
Thu -- 07:08 AM PDT     Sunrise
Thu -- 08:36 AM PDT     5.12 feet High Tide
Thu -- 03:01 PM PDT     Moonset
Thu -- 03:17 PM PDT     0.29 feet Low Tide
Thu -- 07:24 PM PDT     Sunset
Thu -- 10:26 PM PDT     4.68 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.73.22.82.72.93.444.655.14.73.82.71.50.70.30.40.91.72.63.54.24.64.6

Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
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Alcatraz Island S
Click for Map
Thu -- 01:00 AM PDT     -1.20 knots Max Ebb
Thu -- 04:25 AM PDT     Moonrise
Thu -- 04:36 AM PDT     0.00 knots Slack
Thu -- 07:08 AM PDT     Sunrise
Thu -- 07:33 AM PDT     1.07 knots Max Flood
Thu -- 10:10 AM PDT     -0.00 knots Slack
Thu -- 01:11 PM PDT     -2.25 knots Max Ebb
Thu -- 03:01 PM PDT     Moonset
Thu -- 05:12 PM PDT     0.00 knots Slack
Thu -- 07:24 PM PDT     Sunset
Thu -- 08:30 PM PDT     1.59 knots Max Flood
Thu -- 11:27 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1-1.2-1.1-0.8-0.40.20.7110.80.1-0.9-1.8-2.2-2.1-1.7-1.1-0.20.61.31.61.51.20.4

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 (4,6,7,8)
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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.