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 6:59AMSunset 7:03PM Sunday September 24, 2017 9:27 PM PDT (04:27 UTC) Moonrise 10:17AMMoonset 9:02PM Illumination 21% Phase: Waxing Crescent; Moon at 4 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- 813 Pm Pdt Sun Sep 24 2017
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds.
Mon night..NW winds 10 to 20 kt. Wind waves 2 to 4 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 10 seconds.
Tue night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 5 ft at 10 seconds.
Wed..W winds 5 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
Thu..NW winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 3 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 0.8 knots at 06:54 am Monday and 1.4 knots at 07:18 pm Monday.
PZZ500 813 Pm Pdt Sun Sep 24 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific and a thermal trough over the california interior will keep northwesterly winds going over the coastal waters. The strongest winds will be over the northern outer waters with generally lighter winds and seas over the near shore waters.

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 250000
afdmtr
area forecast discussion
national weather service san francisco bay area
459 pm pdt Sun sep 24 2017

Synopsis A gradual warming trend will continue through the first
half of the workweek as high pressure across the eastern pacific
builds over california. While slightly cooling is expected late in
the week, temperatures are forecast to remain above seasonal
averages.

Discussion As of 01:58 pm pdt Sunday... Sunny conditions
persist over the region this afternoon as the air mass aloft warms
in response to weak offshore flow and building high pressure over
the eastern pacific. Meanwhile, at the surface, winds along the
coast remain light and slightly onshore while portions of the
interior are experiencing weak north northeast winds. These
conditions have resulted in a region- wide warming and drying
trend that will continue into the midweek time frame.

Look for temperatures overnight to remain on the cool side of
average for most valley and coastal locations while a more noticeable
warming trend begins in the hills. Temperatures region-wide will
continue on a warming trend Monday and ramp up Tuesday into
Wednesday as surface flow becomes predominantly offshore. By
midweek, 850 mb temperatures are forecast to approach 20 deg c and
will allow for afternoon high temperatures to reach into the
mid upper 80s at the coast with widespread 90s inland. However, even
the warmest inland areas are likely to stay below 100 degrees and a
more uniform temperature spread in the 80s to mid 90s appears most
likely Tuesday through Thursday. With this said, the threat for
heat related illnesses will likely remain in the low to moderate
category given decent overnight cooling.

Slight cooling is then forecast by Friday as weak onshore flow
returns to the coast in response to a mid upper level trough pushing
inland over the pacific northwest. However, the ridge of high
pressure does not completely get replaced and temperatures region-
wide will remain at or slightly above seasonal averages. The medium
to longer range forecast models agree that an upper level ridge will
once again become the dominate weather feature across our region by
late next weekend. This will likely lead to another warming trend by
next Sunday into Monday.

Aviation As of 4:59 pm pdt Sunday... Sct-bkn cirrus cloud coverage
associated with upper level divergence quickly sweeping SE with the
mid-latitude jet stream late this afternoon. High confidenceVFR
forecast for tonight through Monday as dry offshore flow and very
good visibilities prevail.

Vicinity of ksfo...VFR. A few westerly wind gusts to 20-25 knots until
04z this evening. Light surface wind shifting over to n-ne late tonight
into early Monday afternoon. Westerly winds are forecast to resume
from 22z Monday through Monday evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Onshore winds becoming light and shifting
over to e-se direction late tonight and Monday morning. Onshore wind
returns Monday afternoon and evening.

Fire weather As of 3:30 am pdt Sunday... Northerly winds have
eased in the hills since yesterday, but models indicate that
north winds will increase this morning and peak during the late
morning hours. Winds are expected to be strongest across the
north bay, although locally gusty winds are also likely in the
east bay hills. Relative humidity recoveries have been poor in the
hills overnight, with rh values remaining below 30 percent on the
higher peaks and ridges. Poor overnight humidity recoveries and
periods of moderate and gusty north to northeast winds are
forecast to persist through at least Tuesday morning. The most
critical fire weather conditions will remain over the north bay
mountains, particularly on Monday night and Tuesday morning when
winds are forecast to be at their strongest. A red flag warning
remains in effect for elevations above 1000 feet in the north bay
through Tuesday morning.

Marine As of 4:40 pm pdt Sunday... High pressure aloft will
allow a thermal trough to develop at the surface over the coastal
waters. This will keep the strongest northerly winds over the
northern outer waters, west of point reyes with lighter wind and
seas over the near shore waters. Generally light wind and seas are
forecast in the bays the next few days. The upper ridge will stay
in place through the week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
public forecast: rgass
aviation: canepa
marine: rww
fire weather: dykema
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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 mi58 min 60°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi38 min NW 7.8 G 12 59°F 59°F4 ft1013.9 hPa (-0.0)
FTPC1 - 9414290 - San Francisco, CA 11 mi40 min WSW 5.1 G 8 62°F 61°F1014.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi46 min WSW 1.9 G 2.9 67°F 1012.5 hPa
PXSC1 15 mi40 min 67°F 49°F
RCMC1 - 9414863 - Richmond, CA 17 mi40 min S 1.9 G 2.9
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi40 min NW 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi40 min WNW 6 G 7 65°F 1013.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi40 min SSW 5.1 G 8 66°F 1013.9 hPa
OBXC1 18 mi40 min 67°F 54°F
AAMC1 - 9414750 - Alameda, CA 20 mi40 min NNW 1 G 1.9 68°F 68°F1014 hPa
LNDC1 21 mi40 min N 4.1 G 6 67°F 1013.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi40 min NW 12 G 15 64°F 58°F1013.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi40 min SW 2.9 G 5.1 72°F 1013.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi38 min NW 9.7 G 14 62°F 62°F5 ft1014 hPa (+0.5)
RTYC1 - 9414523 - Redwood City, CA 31 mi40 min NW 5.1 G 6 68°F 68°F1013.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi40 min WNW 5.1 G 6 71°F 67°F1013.7 hPa44°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi40 min SW 5.1 G 7 69°F 68°F1013.2 hPa
46214 - Point Reyes, CA (029) 44 mi28 min 60°F5 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi40 min NNW 2.9 G 2.9 70°F 1013 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi103 min NW 1.9 67°F 1012 hPa42°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi28 min NW 19 G 23 60°F 60°F1013.7 hPa (+0.0)56°F

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, CA20 mi32 minWNW 1210.00 miFair65°F46°F51%1013.6 hPa
Half Moon Bay Airport, CA21 mi33 minWNW 310.00 miFair59°F0°F%1013.5 hPa
Oakland, Metro Oakland International Airport, CA24 mi35 minWNW 510.00 miPartly Cloudy65°F57°F76%1013.6 hPa

Wind History from SFO (wind in knots)
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Last 24hrW8W6CalmW6W6SW3S4W3SW3CalmCalmS3NE3NE3N5NE5E4W16W16W20
G25
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1 day agoW7W6W6W4W4W3W4W4W4S3CalmCalmCalmN9NE74W13W14W17W23W19W19W14NW10
2 days agoW19
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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 (0,6,7,8)
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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.