Sunday, October22, 2017 L-36.com


Marine Weather and Tides
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 7:24AMSunset 6:23PM Sunday October 22, 2017 3:41 PM PDT (22:41 UTC) Moonrise 9:02AMMoonset 7:35PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 223 Pm Pdt Sun Oct 22 2017
Tonight..W winds 5 to 15 kt.
Mon..NE winds 10 kt.
Mon night..N winds 10 kt.
Tue..NE winds 5 to 15 kt.
Tue night..W winds 10 kt.
Wed..N winds 5 to 15 kt...becoming w.
Thu..NW winds 5 kt.
Fri..N winds 5 kt...becoming w.
PZZ500 223 Pm Pdt Sun Oct 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Increasing northwest winds later today and overnight. Moderate northwest swells will gradually subside through the evening. A different moderate to long period northwest wave train will arrive late tonight, peaking in energy later Monday.

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 222049
afdmtr
area forecast discussion
national weather service san francisco bay area
149 pm pdt Sun oct 22 2017

Synopsis After a seasonably mild afternoon across the region
today, very warm to hot temperatures are likely on Monday and
Tuesday afternoons. Along with the heat, dry conditions will persist
through the first half of the week as a result of weak offshore
winds. A gradual cooling trend is then forecast during the second
half of the week, yet temperatures will remain above seasonal
averages.

Discussion As of 01:47 pm pdt Sunday... High pressure continues
to build in over the region from the south and will strengthen
through midweek. As the air mass aloft warms, surface temperatures
will also increase with afternoon highs reaching 15 to 20 deg f
above seasonal averages on Monday and Tuesday. This combined with
weak offshore flow will result in temperatures reaching into the
80s at the coast with lower middle 90s inland. With this event,
the warmest temperatures are forecast to occur on Tuesday across
the central coast where the warmest and driest air mass will be in
place. Cannot rule out a few of the warmest inland areas such as
pinnacles national park reaching into the upper 90s.

Overall, winds are forecast to remain light for most urban locations
but may become breezy and locally gusty at times in the peaks and
ridges beginning tonight before gradually tapering off Monday night
into Tuesday. These conditions will raise fire weather concerns to
some extent, but rainfall late last week is providing some temporary
relief, at least initially. By the time conditions dry out late
Monday and Tuesday, wind speeds are forecast to be weaker.

Heat risks will also increase into the moderate category both Monday
and Tuesday afternoon, mainly from the santa cruz mountains southward
through the central coast. However, longer nights and modest
overnight cooling under clear skies will limit the overall heat
risks region-wide through this heat event. Thus, folks are urged to
remain vigilant and use extra caution during the peak heating of the
day through early this week.

The mid upper level ridge is then forecast to weaken and shift back
offshore by midweek in response to an upper level trough digging
southward across the great basin and central plains. This will allow
for a cooling trend from Wednesday through at least Friday, yet
temperatures are forecast to remain above seasonal averages. In
addition, medium to longer range models maintain dry weather
conditions and near to slightly above average temperatures heading
through the end of october.

Aviation As of 10:45 am pdt Sunday...VFR. Generally light
variable winds in the mornings and overnight with light
afternoon evening onshore sea breeze generally of up to 15 kt.

Inland valley locations could see sunrise fog develop, ESP near
ksts.

Vicinity of ksfo...VFR.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR.

Fire weather As of 3:20 am pdt Sunday... Gradual warming and
drying will continue across the district today. Offshore flow is
then forecast to develop tonight, resulting in much warmer and
drier conditions by Monday and Tuesday. Locally moderate and gusty
north to northeast winds are forecast in the hills late tonight
and Monday morning. The latest WRF has scaled back on the
magnitude of wind speeds in the hills tonight and Monday morning.

Even so, local gusty winds are likely over the higher ridges and
peaks of the north bay, particularly across eastern napa county
where gusts up to 40 mph are possible. In addition, nighttime
humidity recoveries will be poor in the hills tonight. Were it not
for the recent wetting rains on Thursday night, these
developments may have resulted in critical fire weather
conditions. However, finer fuels are expected to retain enough
moisture in the short term to mitigate fire weather concerns to
some extent. Will continue to draw attention to local gusty winds
and drying conditions with headlines in the fire weather planning
forecast.

Fuels are expected to dry significantly by late Monday.

Fortunately, winds in the hills on Monday night are not expected
to be as strong as tonight, with only some isolated patches of
gusty winds expected at the higher elevations of the north bay.

Will continue to monitor fuel moisture over the next few days to
determine if critical fire weather conditions may occur. Winds are
expected to subside in all areas by Tuesday afternoon, but very
warm and dry conditions will continue through midweek. Slight
cooling is expected during the second half of the week as high
pressure over california weakens.

Marine As of 10:44 am pdt Sunday... Moderate northwest swells
to subside through day. Small craft advisories in effect for
hazardous seas primarily in the outer waters. A frontal system
will move into the pacific northwest today with northwest winds
increasing tonight behind the front. Winds will decrease Monday
through Wednesday except over the northern outer waters as high
pressure builds into the great basin creating offshore flow.

Mtr watches warnings advisories
Tngt 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 pinos to pt piedras blancas 0-10 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
public forecast: rgass
aviation: drp
marine: drp
fire weather: dykema
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi42 min WSW 8 G 11 62°F 57°F1026.5 hPa (-2.0)
PXSC1 2 mi42 min 70°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi42 min NW 5.1 G 6 69°F 1025.1 hPa (-2.0)
OBXC1 5 mi42 min 65°F 55°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi60 min Calm 70°F 1026 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi42 min WNW 9.9 G 11 61°F 1025.9 hPa (-2.0)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi42 min W 9.9 G 11
AAMC1 - 9414750 - Alameda, CA 8 mi42 min W 5.1 G 8 69°F 62°F1026.2 hPa (-2.1)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi48 min NNW 6 G 8.9 74°F 1026.3 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi42 min NNE 7 G 8 71°F 59°F1025.8 hPa (-2.2)
LNDC1 8 mi42 min NW 7 G 12 71°F 1025.7 hPa (-2.1)
46237 - San Francisco Bar, CA (142) 10 mi42 min 57°F7 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi42 min WSW 2.9 G 4.1 67°F 1025.5 hPa (-2.3)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi52 min NW 14 G 18 57°F 56°F9 ft1026.1 hPa (-1.8)
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi42 min NE 4.1 G 5.1 67°F 62°F1026.2 hPa (-2.2)53°F
RTYC1 - 9414523 - Redwood City, CA 24 mi42 min NW 11 G 13 70°F 64°F1025.4 hPa (-2.1)
PCOC1 - 9415144 - Port Chicago, CA 27 mi42 min W 1 G 1.9 71°F 63°F1025.9 hPa (-2.2)
PRYC1 - 9415020 - Point Reyes, CA 31 mi42 min WNW 15 G 18 56°F1026.3 hPa (-1.6)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi42 min WNW 4.1 G 5.1 70°F 1025.6 hPa (-2.4)
SFXC1 - San Francisco Bay Reserve, CA 35 mi57 min SW 5.1 73°F 1026 hPa54°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 39 mi52 min NNW 16 G 19 59°F 60°F11 ft1025.9 hPa (-1.7)

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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SW11
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA14 mi46 minW 810.00 miFair73°F52°F48%1025.8 hPa
Oakland, Metro Oakland International Airport, CA14 mi49 minW 1110.00 miFair70°F54°F57%1025.8 hPa
Hayward, Hayward Air Terminal, CA20 mi48 minWNW 1010.00 miFair72°F48°F44%1026.4 hPa
Half Moon Bay Airport, CA21 mi47 minNNW 15 G 1910.00 miFair66°F53°F64%1025.4 hPa
San Carlos Airport, CA22 mi52 minNNW 1010.00 miClear72°F48°F44%1026.1 hPa
Novato / Gnoss Field, CA24 mi47 minWNW 410.00 miFair77°F50°F39%1025.7 hPa
Concord, Buchanan Field, CA24 mi49 minNE 310.00 miFair76°F52°F43%1024.6 hPa

Wind History from SFO (wind in knots)
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Last 24hrNW11W15W17W19W9W12NW7W54W5W5W3S4SW3SW3CalmCalmNW3N5NE4NE5N8N8W8
1 day agoW18W14W15W16W18W17W11W11W8W9W7W7W6W5NW5W7W5Calm3NE3NE4NW7W11W13
2 days agoSW12S8S10
G14
S11S11S11S12S17
G23
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G33
W16
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W9W10W9W10W8SW6W4SW4SW6NW7W9W12
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Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Sun -- 02:16 AM PDT     4.79 feet High Tide
Sun -- 07:19 AM PDT     2.29 feet Low Tide
Sun -- 07:25 AM PDT     Sunrise
Sun -- 10:01 AM PDT     Moonrise
Sun -- 01:28 PM PDT     5.64 feet High Tide
Sun -- 06:22 PM PDT     Sunset
Sun -- 07:59 PM PDT     0.09 feet Low Tide
Sun -- 08:35 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.74.44.84.74.13.42.72.32.42.93.64.45.15.65.653.92.51.20.40.10.412

Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
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Alcatraz Island S
Click for Map
Sun -- 12:28 AM PDT     1.74 knots Max Flood
Sun -- 03:36 AM PDT     -0.00 knots Slack
Sun -- 05:52 AM PDT     -1.61 knots Max Ebb
Sun -- 07:25 AM PDT     Sunrise
Sun -- 09:20 AM PDT     0.00 knots Slack
Sun -- 10:01 AM PDT     Moonrise
Sun -- 12:17 PM PDT     1.25 knots Max Flood
Sun -- 02:58 PM PDT     -0.00 knots Slack
Sun -- 06:03 PM PDT     -2.53 knots Max Ebb
Sun -- 06:22 PM PDT     Sunset
Sun -- 08:35 PM PDT     Moonset
Sun -- 09:57 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.71.30.6-0.5-1.3-1.6-1.3-0.9-0.30.40.91.21.10.7-0-1.1-2.1-2.5-2.3-1.6-0.900.8

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 (18,4,5,8)
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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.