Monday, September25, 2017 L-36.com


Marine Weather and Tides
Muir Beach, 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 7:00AMSunset 7:02PM Monday September 25, 2017 3:16 PM PDT (22:16 UTC) Moonrise 11:13AMMoonset 9:41PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 225 Pm Pdt Mon Sep 25 2017
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 9 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 9 seconds.
Tue night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 3 to 5 ft at 9 seconds.
Wed..SE winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 4 ft at 10 seconds.
Wed night..S winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds.
Thu..W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 3 ft.
Fri..W winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 2 to 3 ft.
Sat..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. NW swell 2 to 4 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 2 to 4 ft with a dominant swell period 8 seconds. Across the bar...combined seas 3 to 5 ft with a dominant swell period of 8 seconds. Maximum ebb current of 1.4 knots at 07:18 pm Monday and 0.7 knots at 07:54 am Tuesday.
PZZ500 225 Pm Pdt Mon Sep 25 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwest winds will persist over the northern outer waters today and tomorrow as high pressure resides over the eastern pacific and a thermal trough sits over california. Winds will begin to decrease late in the day tomorrow.

7 Day Forecast for Marine Location Near Muir Beach, CA
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location: 37.78, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 252158
afdmtr
area forecast discussion
national weather service san francisco bay area
258 pm pdt Mon sep 25 2017

Synopsis A warm offshore flow will continue through at least
Wednesday with above average daytime temperatures, mild overnight
conditions and breezy winds in the hills. Conditions cool slightly
near the coast on Thursday before spreading inland Friday as onshore
flow returns.

Discussion As of 02:00 pm pdt Monday... Mostly sunny conditions
and mild temperatures persist over the region this afternoon as
high pressure over the eastern pacific builds toward the west
coast. This will continue to allow for a warming of the air mass
aloft where offshore flow continues. As the airmass warms through
midweek, surface temperatures will continue to trend warmer.

Surface winds will also have more of an offshore component to them
and push the warmer temperatures to the coast. By Tuesday and
Wednesday, afternoon temperatures will likely warm into the
mid upper 80s near the coast and low mid 90s inland. While these
temperatures are a good 10-20 degrees above seasonal averages, not
looking for widespread heat concerns. This is especially true as
the dry air mass will allow for temperatures to cool modestly
overnight and provide relief from the daytime heat.

Above average temperatures are likely to persist on Thursday yet
some cooling is possible at the coast with a return of weak onshore
flow. Further cooling is likely region-wide on Friday as the
mid upper level trough pushes inland to our north. Meanwhile, dry
weather and mostly clear sunny conditions will persist through late
week.

While above average temperatures have been forecast to continue into
the upcoming weekend, the latest forecast models are showing more of
a troughing pattern across the west coast from this weekend into
early next week. Until we see a bit more consistency in the model
solutions in the day 5-8 time frame, will not make any significant
changes to the extended forecast. With that said, if the latest
trends hold true, temperatures will have to be lowed back to below
seasonal averages. The 12z operational run of the ECMWF also brings
a slight chance of precipitation to the region Sunday night into
Monday. Again, will hold of on major changes until we gain better
confidence in the forecast models.

Aviation As of 10:30 am pdt Monday... For 18z tafs. Satellite
imagery this morning showing clear skies across the region
bringingVFR conditions to all sites. Aside from a few high
clouds, expecting relatively clear skies through the period.

Winds generally light with westerly winds 10-15 kt expected this
afternoon.

Vicinity of ksfo...VFR. West winds to 15 kt this afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR with mostly clear skies. Not
expecting any stratus through the period. Generally light winds
this morning with westerly winds this afternoon at around 10 kt.

Fire weather As of 2:57 pm pdt Monday... No real change from
previous forecast. Red flag warnings remain in effect through
weds afternoon for the north and east bay hills. Latest hi-res
models showing winds increasing overnight with decreasing rh.

Typically the window to watch for is late overnight and shortly
after sunrise. Winds will decrease Tuesday afternoon, but temps
will be hot and rh will be low. Hi-res models show another burst
of gusty northeast winds in the north and east bay hills Tuesday
night into early weds. Winds will finally ease by weds afternoon
but by then the fuels will be very dry with low humidity and
likely the hottest day of the week with widespread readings into
the upper 80s and 90s. We are near the peak of bay area fire
season and this is a classic critical fire weather pattern.

Marine As of 08:32 am pdt Monday... Moderate northwesterly
winds will continue over the northern outer waters as high
pressure sits over the eastern pacific and a thermal trough
resides over california. Winds will begin to decrease on Tuesday
as the trough shifts towards the coast.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm until 2 am
sca... Pt pinos to pt piedras blancas 0-10 nm until 2 am
sca... Pt arena to pigeon pt 10-60 nm
public forecast: rgass
aviation: as
marine: as
fire weather: mm rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 2 mi47 min 62°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi87 min WNW 12 G 14 58°F 60°F4 ft1013.1 hPa (-1.4)
FTPC1 - 9414290 - San Francisco, CA 11 mi47 min WSW 8.9 G 17 65°F 61°F1012.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi60 min S 4.1 75°F 1012 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi47 min NNW 1 G 4.1 72°F 1011 hPa
PXSC1 15 mi47 min 77°F 50°F
RCMC1 - 9414863 - Richmond, CA 17 mi47 min S 4.1 G 7 73°F 65°F1011.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi47 min W 4.1 G 5.1
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi47 min SW 8.9 G 11 74°F 1012.3 hPa
OBXC1 18 mi47 min 73°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi47 min WNW 5.1 G 7 68°F 1011.9 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi47 min SW 2.9 G 4.1 73°F 66°F1012.4 hPa
LNDC1 21 mi47 min W 6 G 7 77°F 1011.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi47 min NW 7 G 11 67°F 58°F1012.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi47 min W 5.1 G 6 78°F 1011.4 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi47 min N 4.1 G 5.1 80°F 68°F1011.5 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi87 min NW 16 G 18 61°F 63°F5 ft1012.7 hPa (-1.2)
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi47 min WSW 2.9 G 5.1 80°F 68°F1012 hPa37°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi47 min W 2.9 G 2.9 80°F 68°F1011.5 hPa
46214 - Point Reyes, CA (029) 44 mi47 min 60°F6 ft
SFXC1 - San Francisco Bay Reserve, CA 45 mi92 min WSW 2.9 85°F 1012 hPa42°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi47 min NNE 11 G 13 80°F 1011.2 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi37 min NW 18 G 19 59°F 1013.2 hPa57°F

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, CA20 mi21 minWNW 1110.00 miA Few Clouds79°F50°F36%1011.6 hPa
Half Moon Bay Airport, CA21 mi22 minNNW 1210.00 miFair72°F0°F%1011.5 hPa
Oakland, Metro Oakland International Airport, CA24 mi24 minW 610.00 miA Few Clouds79°F41°F26%1011.7 hPa

Wind History from SFO (wind in knots)
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Last 24hrW16W20
G25
W20W14W11W12W9W7W8W3NW3NW5SW5CalmW3CalmCalmCalmNE5E4NE3E5E6W11
1 day agoW17W23W19W19W14NW10W8W6CalmW6W6SW3S4W3SW3CalmCalmS3NE3NE3N5NE5E4W16
2 days agoW13W10W10W14W11W11W7W6W6W4W4W3W4W4W4S3CalmCalmCalmN9NE74W13W14

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Mon -- 03:34 AM PDT     4.22 feet High Tide
Mon -- 07:01 AM PDT     Sunrise
Mon -- 08:48 AM PDT     2.55 feet Low Tide
Mon -- 12:11 PM PDT     Moonrise
Mon -- 02:56 PM PDT     5.09 feet High Tide
Mon -- 07:02 PM PDT     Sunset
Mon -- 09:39 PM PDT     0.90 feet Low Tide
Mon -- 10:40 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.53.23.84.24.23.93.532.62.62.83.23.84.44.95.14.94.23.32.31.510.91.2

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Mon -- 01:07 AM PDT     1.13 knots Max Flood
Mon -- 04:51 AM PDT     -0.00 knots Slack
Mon -- 07:00 AM PDT     Sunrise
Mon -- 07:05 AM PDT     -0.94 knots Max Ebb
Mon -- 10:16 AM PDT     0.00 knots Slack
Mon -- 12:11 PM PDT     Moonrise
Mon -- 01:03 PM PDT     0.83 knots Max Flood
Mon -- 04:20 PM PDT     -0.00 knots Slack
Mon -- 07:01 PM PDT     Sunset
Mon -- 07:22 PM PDT     -1.42 knots Max Ebb
Mon -- 10:40 PM PDT     Moonset
Mon -- 11:05 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.11.10.80.4-0.1-0.7-0.9-0.8-0.5-0.10.30.70.80.70.50.1-0.4-1-1.4-1.3-1-0.6-0.1

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.