Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Muir Beach, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:23AMSunset 7:53PM Saturday April 21, 2018 8:39 AM PDT (15:39 UTC) Moonrise 10:16AMMoonset 12:04AM Illumination 37% Phase: Waxing Crescent; Moon at 6 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- 222 Am Pdt Sat Apr 21 2018
.small craft advisory in effect through late tonight...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 3 to 5 ft at 15 seconds and S 3 ft at 18 seconds.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. Mixed swell W 3 to 5 ft at 15 seconds and S 3 ft at 16 seconds.
Sun..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 3 to 5 ft at 14 seconds.
Sun night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 14 seconds.
Mon..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 13 seconds.
Tue..W winds 10 kt. Wind waves 2 ft or less. W swell 4 to 6 ft.
Wed..SW winds 10 kt. Wind waves 2 ft or less. W swell 5 to 7 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 5 to 7 ft at 12 seconds. Across the bar...combined seas 6 to 8 ft at 12 seconds. Maximum ebb current of 3.6 knots at 07:19 am Saturday and 1.2 knots at 09:31 pm Saturday.
PZZ500 222 Am Pdt Sat Apr 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Continued breezy northwest winds are expected over the coastal waters this weekend as high pressure remains over the eastern pacific. Steep wind waves and fresh swell will result in hazardous seas likely over the weekend and possibly into early next week.

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 211527
afdmtr
area forecast discussion
national weather service san francisco bay area
827 am pdt Sat apr 21 2018

Synopsis A warming trend and dry weather are forecast through
the weekend. Cooler temperatures are expected next week as a low
pressure system develops over the eastern pacific.

Discussion As of 08:27 am pdt Saturday... For much of the bay
area this morning clear skies prevail. The big exception is
monterey bay and the salinas valley. A marine stratus layer
developed overnight and moved up the salinas valley. The ft ord
profiler puts the marine layer depth at about 1500 feet, but
metars at kmry ksns show lower cloud decks at 300-400 feet. Latest
hi-res models keep the low clouds through mid morning before
eroding back to the coastal waters. Did a quick update to the
forecast to better reflect latest trends from satellite.

Otherwise, pleasant weather expected around the bay area today
with above normal temperatures.

Prev discussion As of 3:20 am pdt Saturday... Satellite imagery
shows a patch of coastal stratus covering the monterey bay and
extending partially into the salinas valley. Current temperatures
are running warmer than last night's and are in the lower 50s for
the most part. Weak high pressure building over the state today
will bring warmer temperatures to the area today. Highs today are
forecast to be in the 60s to lower 70s at the coast and the upper
70s to mid 80s inland.

A weak upper trough is progged to brush across northern california
on Sunday which will bring a little cooling to the area. Mild
temperatures will continue through about midweek with highs
generally in the 60s coast to lower 80s inland.

Medium range models continue to indicate a cut-off low forming
over the eastern pacific by midweek. This low is not expected to
bring rain to the area, but will likely bring cooler weather and
possibly more low clouds. Confidence remains low, however, given
the uncertain nature of cut-off lows.

Aviation As of 4:27 am pdt Saturday for 12z tafs. Infrared
satellite imagery shows some areas of stratus situated over the
monterey bay and the salinas valley. Outside these locations,
skies remain mostly clear to clear withVFR conditions expected to
prevail. Onshore winds will increase by the afternoon to around
10 to 20 kt.

Vicinity of ksfo...VFR conditions expected to prevail. Light winds
in the morning will increase through the day to around 20 kt in
the afternoon (with higher speeds quite possible, like yesterday).

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr and even lifr ceilings have been
reported as low clouds swirl over the monterey bay, impacting kmry
and ksns. At this time think the stratus will mix out sometime
around mid-morning with a return toVFR conditions. Clouds may
again impact the terminals sometime in the evening overnight hours
heading into early Sunday.

Marine As of 2:22 am pdt Saturday... Continued breezy northwest
winds are expected over the coastal waters this weekend as high
pressure remains over the eastern pacific. Steep wind waves and
fresh swell will result in hazardous seas likely over the weekend
and possibly into early next week.

Mtr watches warnings advisories
Tday Sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: mm sims
aviation: rowe
marine: rowe
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 2 mi69 min 53°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi49 min NNW 12 G 14 51°F 51°F8 ft1020.5 hPa (+0.3)
FTPC1 - 9414290 - San Francisco, CA 11 mi51 min Calm G 1
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi58 min Calm 55°F 1021 hPa
PXSC1 15 mi81 min 55°F 49°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi51 min ESE 4.1 G 5.1 53°F 1019.7 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi51 min NNW 1 G 2.9
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi51 min S 1.9 G 2.9 55°F 1021.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi51 min ESE 2.9 G 5.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi51 min SE 2.9 G 5.1 53°F 1020.8 hPa
OBXC1 18 mi51 min 53°F 50°F
AAMC1 - 9414750 - Alameda, CA 20 mi57 min SSE 4.1 G 6 54°F 62°F1020.9 hPa
LNDC1 21 mi51 min SE 6 G 7 54°F 1020.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi51 min WNW 11 G 14 51°F1020.2 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi51 min WSW 4.1 G 6 55°F 1020.4 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi51 min SE 1.9 G 5.1 53°F 62°F1021.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi49 min NNW 16 G 19 53°F 54°F9 ft1020.4 hPa (-0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi51 min WNW 7 G 8 54°F 59°F1020.7 hPa54°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi51 min SW 6 G 8 54°F 59°F1020.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi114 min Calm 48°F 1020 hPa46°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi51 min NW 8 G 12 56°F 1020 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi39 min NNW 18 G 23 52°F 50°F1021 hPa (+0.6)47°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 mi1.7 hrsN 010.00 miA Few Clouds51°F46°F83%1020.3 hPa
Half Moon Bay Airport, CA21 mi44 minN 05.00 miFog/Mist48°F46°F94%1021 hPa
Oakland, Metro Oakland International Airport, CA24 mi46 minN 010.00 miA Few Clouds54°F50°F87%1021 hPa

Wind History from SFO (wind in knots)
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Last 24hrCalmNE4NE4NE4W16W16W21W23W23W24
G28
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W12W12W9W9CalmW7W6W10W5W5CalmCalm
1 day agoW9W13W16W19W21
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W19W18W9W9W7NW3CalmW3W6W3CalmCalmW4Calm
2 days agoW10W8W11W5W12W13W13W11W6W11W8W6W8W9W6NW8NW7W9W8W6W8W5W6W6

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Sat -- 01:04 AM PDT     Moonset
Sat -- 03:11 AM PDT     5.41 feet High Tide
Sat -- 06:27 AM PDT     Sunrise
Sat -- 10:09 AM PDT     -0.58 feet Low Tide
Sat -- 11:16 AM PDT     Moonrise
Sat -- 05:41 PM PDT     4.27 feet High Tide
Sat -- 07:51 PM PDT     Sunset
Sat -- 10:27 PM PDT     2.78 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.84.55.15.45.24.63.420.7-0.2-0.6-0.40.2122.93.74.24.343.53.12.82.8

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Sat -- 01:03 AM PDT     Moonset
Sat -- 01:24 AM PDT     0.81 knots Max Flood
Sat -- 04:26 AM PDT     -0.00 knots Slack
Sat -- 06:26 AM PDT     Sunrise
Sat -- 07:54 AM PDT     -1.73 knots Max Ebb
Sat -- 11:15 AM PDT     Moonrise
Sat -- 11:36 AM PDT     0.01 knots Slack
Sat -- 02:45 PM PDT     1.28 knots Max Flood
Sat -- 06:45 PM PDT     -0.01 knots Slack
Sat -- 07:51 PM PDT     Sunset
Sat -- 08:44 PM PDT     -0.75 knots Max Ebb
Sat -- 11:52 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.80.80.50.2-0.3-1-1.5-1.7-1.5-0.9-0.40.20.81.21.31.10.90.4-0.2-0.6-0.7-0.5-0.3

Weather Map and Satellite Images
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wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (11,2,3,4)
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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.