Wednesday, July26, 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 6:07AMSunset 8:25PM Tuesday July 25, 2017 9:41 PM PDT (04:41 UTC) Moonrise 7:43AMMoonset 9:13PM Illumination 7% 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 900 Pm Pdt Tue Jul 25 2017
Tonight..SW winds 10 kt. Wind waves 3 ft in the evening... Becoming 2 ft or less. NW swell 3 to 5 ft at 9 seconds.
Wed..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 8 seconds. Patchy fog in the morning.
Wed night..SW winds 10 kt. Wind waves 3 ft in the evening... Becoming 2 ft or less. NW swell 3 to 4 ft at 8 seconds. Patchy fog after midnight.
Thu..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft at 9 seconds. Patchy fog in the morning.
Thu night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds. Patchy fog after midnight.
Fri..W winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft...increasing to 5 to 7 ft. Patchy fog.
Sat..W winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft. SWell S 3 to 4 ft. Patchy fog.
Sun..NW winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft. SWell S 3 to 4 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a dominant swell period of 10 seconds. Across the bar...combined seas 4 to 6 ft with a dominant swell period of 10 seconds. Maximum ebb current of 1.8 knots at 05:12 am Wednesday and 1.1 knots at 06:30 pm Wednesday.
PZZ500 900 Pm Pdt Tue Jul 25 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak area of low pressure off the california coast will continue to produce a southerly flow today along the immediate coast. West to northwest winds will return tomorrow as high pressure builds over the eastern pacific. SEveral tropical disturbances in the pacific will bring a long period southerly swell to the coastal waters at the end of the week and through weekend.

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 260412
afdmtr
area forecast discussion
national weather service san francisco bay area
912 pm pdt Tue jul 25 2017

Synopsis A gradual warming trend will get underway beginning on
Wednesday and continue through late week. By Thursday and into the
weekend, afternoon temperatures will warm to above seasonal averages
for inland areas while coastal locations remain cooler. Above average
temperatures are then likely to persist into early next week.

Discussion As of 9:12 pm pdt Tuesday... A vertically extensive,
nearly stationary, and dry low pressure area is located near the
bay area this evening. This low is dry except it is responsible
for helping to produce ongoing scattered thunderstorms over the
highest terrain of northern and eastern california.

It was a nice late july day, and temperatures have settled back
and remain comfortable over most if not all locations this evening
with 9 pm temperatures in the upper 50s along the immediate coast
and 60s near the bays and inland valleys. A deep marine layer will
persist tonight into Wednesday with clouds and fog coverage similar
to last night's and early this morning's coverage. The aforementioned
low pressure area will gradually dissipate and move eastward through
mid-week. A mid-upper level high pressure will redevelop and cause
a warming trend into this weekend and next week.

Prev discussion As of 01:38 pm pdt Tuesday... Temperatures across
the region this afternoon are generally running near to a few
degrees above those 24 hours ago. In addition, low clouds have
mixed out well given the deep marine layer in place with mostly
sunny conditions for most coastal and just about all inland areas.

With the marine layer forecast to remain between 2000-2500 feet
in depth overnight, look for low clouds to return to the coast
late this evening and then spread inland through the overnight.

The mid upper level trough and associated low pressure system that
has brought a few days of cooler than average temperatures to the
region will begin to lift northward on Wednesday. This will allow
for the air mass aloft to warm as the upper level high over the
southern portion of the country builds back toward the west coast.

Thus, look for a warming trend to begin by Wednesday afternoon with
temperatures up by about 3 to 6 degrees for inland areas. Meanwhile,
coastal areas will continue to stay around seasonal averages due to
continued onshore flow and marine influences.

Additional warming is expected from late in the week into early next
week as the mid upper level ridge of high pressure builds over the
southwestern portion of the country. There remains model differences
in the placement of the ridge as well as how strong it will become.

Thus, it is difficult at this time to nail down exactly which day
will be the warmest. However, do expect inland temperatures to warm
to above seasonal averages with 90s more widespread in the higher
elevations and in the valleys interior. By late week, will also see
temperatures in the warmest inland areas warming into the 100-105
degree mark. At this time, not expecting widespread heat impacts,
yet will need to monitor given the current level of uncertainty in
the models. With the ridge building aloft, also expect the marine
layer to become more compressed with less inland penetration of
overnight morning low clouds. Also worth noting, conditions near the
coast are not forecast to warm all that much given the persistent
onshore flow and typical influences from the pacific.

Aviation As of 4:55 pm pdt Tuesday... For 00z tafs... Clear
skies prevail across area terminals at this hour with southerly
flow once again along the coast. Will maintain a persistence
forecast similar to Monday. Downsloping will keep CIGS out of
select terminals till later tonight while others will see cigs
return earlier. See tafs for more detailed information.

Moderate confidence.

Vicinity of ksfo...VFR conditions will prevail through late
tonight with MVFR ifr CIGS returning around 11z-12z Wednesday
morning. CIGS will scatter out around 17z Wednesday morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions will prevail through late
this evening over kmry while MVFR CIGS are anticipated to return
to ksns by early evening as a result of the southerly flow along
the coast. Downsloping will keep kmry cloud-free a bit longer
than ksns but the deep 2400 ft marine layer will help bring cigs
back to kmry around 05z. CIGS will scatter out around 17z-18z
Wednesday morning.

Marine As of 2:21 pm pdt Tuesday... A weak area of low pressure
off the california coast will continue to produce a southerly
flow today along the immediate coast. West to northwest winds will
return tomorrow as high pressure builds over the eastern pacific.

Several tropical disturbances in the pacific will bring a long
period southerly swell to the coastal waters at the end of the
week and through weekend.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 10 pm
public forecast: canepa rgass
aviation: cw
marine: anna
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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 mi42 min 57°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi52 min SE 3.9 G 5.8 56°F 55°F4 ft1015.3 hPa (+0.6)
FTPC1 - 9414290 - San Francisco, CA 11 mi42 min W 6 G 9.9 59°F 59°F1015.4 hPa (+0.9)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi42 min WSW 11 G 16 60°F 1014 hPa (+0.9)
PXSC1 15 mi42 min 61°F 57°F
RCMC1 - 9414863 - Richmond, CA 17 mi42 min SSW 5.1 G 9.9 61°F 63°F1014.8 hPa (+1.2)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi42 min W 7 G 9.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi42 min W 8.9 G 11 61°F 1015.1 hPa (+1.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi42 min SW 9.9 G 12 62°F 1015.2 hPa (+1.1)
OBXC1 18 mi42 min 61°F 58°F
AAMC1 - 9414750 - Alameda, CA 20 mi42 min WNW 8.9 G 12 62°F 69°F1015.6 hPa (+1.1)
LNDC1 21 mi42 min NW 4.1 G 6 62°F 1015 hPa (+0.9)
PRYC1 - 9415020 - Point Reyes, CA 22 mi42 min E 1.9 G 4.1 61°F 58°F1015.3 hPa (+0.9)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi42 min SW 12 G 16 62°F 1014.4 hPa (+1.7)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi52 min SE 7.8 G 9.7 58°F 57°F6 ft1014.6 hPa (+0.6)
RTYC1 - 9414523 - Redwood City, CA 31 mi42 min N 7 G 8 63°F 74°F1014.1 hPa (+1.4)
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi42 min W 16 G 19 63°F 69°F1014.3 hPa (+1.6)59°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi42 min WSW 8.9 G 13 64°F 71°F1014.1 hPa (+2.0)
46214 - Point Reyes, CA (029) 44 mi42 min 57°F6 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi42 min WNW 11 G 15 71°F 1013.1 hPa (+1.7)
SFXC1 - San Francisco Bay Reserve, CA 45 mi57 min WNW 8 65°F 1013 hPa57°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi32 min NE 3.9 G 3.9 57°F 58°F1016 hPa57°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 mi46 minWNW 810.00 miA Few Clouds67°F54°F63%1014.5 hPa
Half Moon Bay Airport, CA21 mi47 minS 610.00 miOvercast59°F55°F88%1014.9 hPa
Oakland, Metro Oakland International Airport, CA24 mi49 minNNW 910.00 miA Few Clouds61°F57°F87%1014.8 hPa

Wind History from SFO (wind in knots)
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Last 24hrS9SE5SE6SE5CalmSW4S8S63S4S7S4NE7NE6N10N10N9SW11W11SW9W10W11W8W8
1 day agoNW9NW8W8W7W7W5W6W5W5S3CalmE5NE6NE7N8NE4S11
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2 days agoW10W9W10W8W12W7W11W8W8W8NW6NW6NW10NW11NW13NW16NW17NW20NW20NW17W19
G27
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Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Wed -- 01:15 AM PDT     5.99 feet High Tide
Wed -- 06:09 AM PDT     Sunrise
Wed -- 07:48 AM PDT     -0.52 feet Low Tide
Wed -- 09:48 AM PDT     Moonrise
Wed -- 02:49 PM PDT     5.41 feet High Tide
Wed -- 08:12 PM PDT     2.02 feet Low Tide
Wed -- 08:24 PM PDT     Sunset
Wed -- 10:48 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.565.853.620.6-0.3-0.5-0.10.823.34.45.25.454.23.22.422.22.73.5

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Wed -- 02:42 AM PDT     -0.01 knots Slack
Wed -- 05:41 AM PDT     -2.00 knots Max Ebb
Wed -- 06:09 AM PDT     Sunrise
Wed -- 09:11 AM PDT     0.01 knots Slack
Wed -- 09:47 AM PDT     Moonrise
Wed -- 12:13 PM PDT     1.65 knots Max Flood
Wed -- 03:53 PM PDT     -0.01 knots Slack
Wed -- 06:16 PM PDT     -1.33 knots Max Ebb
Wed -- 08:23 PM PDT     Sunset
Wed -- 09:28 PM PDT     0.00 knots Slack
Wed -- 10:47 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.310.5-0.3-1.2-1.9-2-1.6-1-0.20.71.41.61.61.20.7-0.1-0.9-1.3-1.2-0.9-0.30.30.9

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.