Sunday, October22, 2017 L-36.com


Marine Weather and Tides
Lagunitas-Forest Knolls, 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 7:25AMSunset 6:23PM Sunday October 22, 2017 12:22 PM PDT (19:22 UTC) Moonrise 9:04AMMoonset 7:36PM 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- 901 Am Pdt Sun Oct 22 2017
.small craft advisory in effect from 4 pm pdt this afternoon through late tonight...
Today..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 7 to 9 ft at 13 seconds. Patchy fog late in the morning.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 7 to 9 ft at 13 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 6 to 8 ft at 13 seconds.
Mon night..NW winds 10 kt. Wind waves 2 ft or less. NW swell 6 to 8 ft at 13 seconds.
Tue..NW winds 10 kt. Wind waves 2 ft or less. NW swell 5 to 7 ft at 13 seconds.
Wed..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft.
Thu..NW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 7 to 9 ft with a dominant swell period of 13 seconds decreasing to 6 to 8 ft tonight. Across the bar...combined seas 8 to 10 ft with a dominant swell period of 13 seconds decreasing to 7 to 9 ft tonight. Breakers up to 20 feet possible. Maximum ebb current of 1.7 knots at 05:18 pm Sunday and 0.8 knots at 05:54 am Monday.
PZZ500 901 Am 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... 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.

7 Day Forecast for Marine Location Near Lagunitas-Forest Knolls CDP, CA
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location: 37.98, -122.74     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 221748
afdmtr
area forecast discussion
national weather service san francisco bay area
1048 am pdt Sun oct 22 2017

Synopsis The warming trend that got underway across our region
yesterday will continue today. The warming trend will intensify
on Monday when offshore flow develops. Very warm and dry
conditions are forecast across the region on both Monday and
Tuesday. Dry weather conditions will persist through the week.

Gradual cooling is forecast during the second half of the week,
but temperatures will remain above seasonal averages.

Discussion As of 08:59 am pdt Sunday... The region remains in
between a ridge building to our south and a mid upper level system
pushing into the pacific northwest. With this, temperatures are
slightly warmer compared to 24 hours ago, especially over the
central coast where humidity values are lower. In the san
francisco bay area and the north bay, higher humidity this morning
with areas of low clouds and patchy fog (dense at times). The
cloud fog will burn-off through the morning and give way to sunny
conditions region-wide this afternoon. Temperatures are forecast
to slightly warmer for just about all locations as well with a
more robust warming trend still forecast for Monday and Tuesday.

The ongoing forecast looks good at this time and no major updates
are needed. Please see the previous forecast discussion below for
additional details.

Prev discussion As of 3:20 am pdt Sunday... Warming aloft under a
building ridge of high pressure has resulted in the formation of a
shallow marine layer near the coast overnight. However, onshore
flow is very weak and so morning low clouds and fog should remain
patchy and mostly confined to coastal areas. Otherwise, expect a
mostly sunny and mild Sunday with continued warming. Afternoon
highs are forecast to be mostly in the 70s and lower 80s, and
anywhere from 5 to 10 degrees warmer than yesterday.

Offshore flow is forecast to develop tonight as surface high
pressure builds over the pacific northwest and into the great
basin. Moderate and gusty north to northeast winds will develop in
the hills late tonight and continue into Monday morning. The 00z
wrf backed off on the magnitude of wind speeds in the hills late
tonight and Monday morning, and winds will almost certainly
remain below advisory criteria. However, there will be enough wind
and drying by Monday to raise fire weather concerns to some
extent. See the fire weather discussion below for more details.

Offshore flow combined with robust airmass warming under a
strengthening upper ridge will result in much warmer and drier
conditions across our region on Monday and Tuesday. By Monday look
for widespread high temperatures in the 80s and lower 90s... Even
in coastal areas. Tuesday is expected to be the warmest day of the
week with some mid to upper 90s possible across interior monterey
county, and even a few lower 90s near the coast in places like
santa cruz. A few daily record high temperatures are possible.

Heat risks will increase into the moderate category by Tuesday,
especially at higher elevations where there will not be as much
cooling at night. Most lower elevation locations are not expected
to experience significant heat risk due to the long late october
nights which will allow for good overnight cooling.

The upper level ridge is forecast to weaken slightly and shift
offshore by midweek. This will result in gradual cooling during
the second half of the week. Even so, temperatures will remain
well above seasonal averages through at least Thursday.

Longer range models show no signs of precipitation through the end
of the month.

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
Tday Sca... Pt arena to pt reyes 0-10 nm from 4 pm
sca... Pt reyes to pigeon pt 0-10 nm from 4 pm
sca... Pigeon pt to pt pinos 0-10 nm from 4 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: rgass dykema
aviation: drp
marine: drp
fire weather: dykema
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 13 mi53 min WNW 9.9 G 12 55°F1028.1 hPa
46237 - San Francisco Bar, CA (142) 15 mi53 min 57°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi93 min NW 7.8 G 9.7 54°F 55°F9 ft1028.3 hPa (+0.8)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi61 min NNW 1.9 60°F 1028 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi53 min N 9.9 G 12 62°F 59°F1028.1 hPa
FTPC1 - 9414290 - San Francisco, CA 19 mi53 min E 4.1 G 4.1 59°F 58°F1028.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi53 min NNW 8.9 G 12 66°F 1028.3 hPa
PXSC1 22 mi53 min 59°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi53 min NW 4.1 G 5.1 60°F 1027.1 hPa
OBXC1 24 mi53 min 60°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi53 min NNW 7 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi53 min NNW 8.9 G 11 60°F 1027.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi53 min NW 5.1 G 6 60°F 1028.1 hPa
AAMC1 - 9414750 - Alameda, CA 27 mi53 min NW 4.1 G 7 63°F 61°F1028.3 hPa
LNDC1 27 mi53 min NNW 8.9 G 11 63°F 1027.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi53 min Calm G 0 62°F 62°F1028.5 hPa54°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi43 min WNW 12 G 14 55°F 53°F1028.8 hPa55°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi53 min NNW 2.9 G 2.9 61°F 62°F1028.3 hPa
46214 - Point Reyes, CA (029) 39 mi53 min 54°F9 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi98 min SSW 2.9 62°F 1028 hPa54°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi93 min NNW 12 G 16 56°F 60°F10 ft1027.6 hPa (+0.6)
RTYC1 - 9414523 - Redwood City, CA 43 mi53 min NW 7 G 8 61°F 64°F1027.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi53 min N 2.9 G 4.1 62°F 1028.1 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi48 minNNW 810.00 miFair68°F53°F60%1028.1 hPa
Petaluma Municipal Airport, CA20 mi28 minVar 4 G 1010.00 miFair68°F53°F60%1028.1 hPa

Wind History from DVO (wind in knots)
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Last 24hrNW10
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W8W6SW9
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4CalmNW9
G14
NW12SE5SE4E4CalmCalmCalmCalmCalmS3CalmCalmCalmCalmN9
1 day agoNW7NW12NW7
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N6E7CalmCalmCalmCalmCalmN3CalmCalmN4N8
2 days agoSW10W7
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SW8SW13SW74--SW10S8W16
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CalmN6CalmSW3CalmW3W3N7

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Sun -- 02:05 AM PDT     3.35 feet High Tide
Sun -- 07:26 AM PDT     Sunrise
Sun -- 07:57 AM PDT     1.39 feet Low Tide
Sun -- 10:03 AM PDT     Moonrise
Sun -- 01:17 PM PDT     3.94 feet High Tide
Sun -- 06:23 PM PDT     Sunset
Sun -- 08:36 PM PDT     Moonset
Sun -- 08:37 PM PDT     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.53.13.33.22.92.41.91.51.41.62.22.93.63.93.93.52.821.10.50.10.10.51.1

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Sun -- 02:49 AM PDT     -0.00 knots Slack
Sun -- 05:09 AM PDT     -0.80 knots Max Ebb
Sun -- 07:28 AM PDT     Sunrise
Sun -- 08:37 AM PDT     0.00 knots Slack
Sun -- 10:04 AM PDT     Moonrise
Sun -- 11:20 AM PDT     0.75 knots Max Flood
Sun -- 02:11 PM PDT     -0.00 knots Slack
Sun -- 05:20 PM PDT     -1.26 knots Max Ebb
Sun -- 06:24 PM PDT     Sunset
Sun -- 08:37 PM PDT     Moonset
Sun -- 09:14 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.80.4-0.1-0.6-0.8-0.7-0.5-0.20.10.50.70.70.50.1-0.4-1-1.2-1.2-0.9-0.6-0.10.40.8

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 (15,3,4,5)
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Ground Weather Radar Station Sacramento, 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.