Thursday, October19, 2017 L-36.com


Marine Weather and Tides
Dillon 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 7:23AMSunset 6:27PM Thursday October 19, 2017 2:18 AM PDT (09:18 UTC) Moonrise 6:11AMMoonset 5:52PM Illumination 1% Phase: Waning Crescent; Moon at 29 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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PZZ540 Point Arena To Point Reyes To 10 Nm- 903 Pm Pdt Wed Oct 18 2017
.small craft advisory in effect from Thursday evening through Friday morning...
Tonight..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. Mixed swell nw 4 to 5 ft at 11 seconds and sw 3 ft at 16 seconds. Patchy fog after midnight.
Thu..S winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw 4 to 6 ft at 10 seconds and sw 3 ft at 15 seconds. Patchy fog in the morning. Slight chance of rain in the morning, then chance of rain in the afternoon.
Thu night..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft at 19 seconds...increasing to 13 to 16 ft at 18 seconds after midnight. SWell S 3 ft. Rain in the evening, then slight chance of rain after midnight.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 14 to 17 ft at 18 seconds. Slight chance of showers in the morning.
Fri night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 12 to 15 ft at 16 seconds.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 9 to 12 ft.
Sun..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 8 to 10 ft.
Mon..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 8 to 10 ft.
PZZ500 903 Pm Pdt Wed Oct 18 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An approaching frontal boundary will bring increased winds and seas to the coastal waters beginning Thursday afternoon into Friday resulting in hazardous sea conditions. Winds will ramp up first Thursday afternoon with large long period swells following Thursday night into Friday. The front will also bring a chance of rain across the coastal waters.

7 Day Forecast for Marine Location Near Dillon Beach, CA
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location: 38.25, -122.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 190556
afdmtr
area forecast discussion
national weather service san francisco bay area
1056 pm pdt Wed oct 18 2017

Synopsis A cold front remains on track to push through our
region on Thursday and Thursday night, bringing our first
widespread rainfall event of the season, along with cooler
temperatures. Look for the greatest rainfall to be in the coastal
ranges and across the north bay. Along with cooler temperatures,
breezy onshore winds can be expected through Friday. Dry
conditions will return by Friday and a warming trend is forecast
over the weekend and into the first part of next week.

Temperatures are forecast to be well above seasonal averages
during the first half of next week.

Discussion As of 9:05 pm pdt Wednesday... Cooling occurred in
most areas today as onshore flow increased and a marine layer
became established along the coast. Afternoon highs today were 10
to 20 degrees cooler than yesterday along the coast. Inland areas
experienced more modest cooling, and some of the valleys farthest
inland and the hills above 1500 feet remained warm. But even
those warm areas will cool tomorrow as clouds associated with an
incoming weather system spread across the region and onshore flow
increases further.

Evening IR satellite imagery shows a cold front beginning to push
into the pacific northwest. The models remain consistent on the
timing of this system as it tracks to the southeast tonight and
Thursday. Rain is expected to begin along the sonoma county coast
as early as midday tomorrow, with light rain then expected to
spread across most of the rest of the north bay during the
afternoon. Rain will then develop south and east across the
remainder of our forecast area from early Thursday evening through
late Thursday night. Up until yesterday, the models had been
trending drier with this system. But lately the models indicate
this system may manage to tap into the higher pw air to our
southwest, at least to a limited extent. Consequently, model qpf
has been trending slightly higher. The 00z NAM forecasts local rain
totals up to 0.75" in the north bay mountains tomorrow afternoon
and evening, and up to 0.25" in the santa cruz mountains tomorrow
night. Elsewhere in the hills and north bay valleys, expect rain
totals from 0.10-0.25", while all other valley locations will
likely see a tenth of an inch or less.

Most models indicate that rain will end in all areas by Friday
morning, although the latest WRF shows a few showers lingering
across the southeast portion of our area for a few hours after
sunrise Friday. Otherwise, Friday is expected to be a partly
cloudy and relatively cool day with brisk onshore winds.

A warming trend is forecast over the upcoming weekend as an upper
ridge begins to build over california. That ridge is then expected
to amplify and strengthen along the west coast early next week,
resulting in robust airmass warming over california. 850 mb
temperatures are forecast to climb from only about 3 deg c on
Friday to around 22 deg c by late Monday. In addition, light
offshore flow is forecast to develop by Monday and Tuesday. The
result will be warm and dry conditions across our entire region on
Monday and Tuesday, with widespread highs in the 80s to around 90.

As is often the case with offshore flow this time of year, daytime
temperatures will be just as warm at coastal locations as inland
areas. Models indicate slight cooling at the coast beginning
Wednesday, but warmth continuing inland.

Aviation As of 10:56 pm pdt Wednesday... For 06z tafs. Patchy
low clouds are beginning to impact area terminals with lifr to ifr
cigs. The marine layer remains around 1000 ft and will allow low
clouds to penetrate well inland tonight. Low confidence with
respect to clearing times Thursday morning. Moderate onshore flow
will gradually ease overnight becoming light and locally
variable. An approaching front will bring chance of rain late in
the period Thursday evening and overnight into Friday.

Vicinity of ksfo... Ifr CIGS will prevail through tonight. Low
confidence with respect to clearing times Thursday morning. West
winds will continue through this evening then gradually ease
becoming light and variable early Wednesday morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS will prevail through tonight. Cigs
will continue to drop becoming lifr between 08z and 09z. Low
confidence with respect to clearing times Thursday morning. West
winds will continue through this evening then gradually ease
becoming light and variable early Wednesday morning.

Fire weather As of 8:45 pm pdt Wednesday... Relative humidity
values continue to increase in the valleys and along the lower
coastal slopes as light onshore flow persists and a marine layer
becomes established near the coast. However, the airmass in the
hills above 1500 feet remains relatively dry and expect one more
night of poor humidity recoveries in the higher hills. Onshore
winds will continue to gradually increase into Thursday and
moderate and locally gusty winds are expected. Models continue to
move an early season cold front through the district late
Thursday and Thursday night. Rainfall will begin in the north bay
Thursday afternoon and spread across most of the remainder of the
district Thursday night. The models have just recently trended
slightly wetter with this system, although rainfall amounts are
still expected to be mostly light. Wetting rains are most likely
in the north bay mountains and perhaps locally in the santa cruz
mountains. Rainfall should end in most areas by Friday morning.

Friday will be a cool day with brisk northwest winds.

A warming trend will begin over the upcoming weekend as a high
pressure ridge begins to build over california. This ridge will
strengthen into early next week and result in warm and dry
conditions districtwide from Monday through Wednesday. Will need
to be wary of possible gusty offshore winds in the hills by Sunday
night and especially Monday night.

Marine As of 9:00 pm pdt Wednesday... An approaching frontal
boundary will bring increased winds and seas to the coastal waters
beginning Thursday afternoon into Friday resulting in hazardous
sea conditions. Winds will ramp up first Thursday afternoon with
large long period swells following Thursday night into Friday. The
front will also bring a chance of rain across the coastal waters.

Mtr watches warnings advisories
Tngt Sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: dykema
aviation marine: cw
fire weather: dykema
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 17 mi38 min WNW 7.8 G 9.7 53°F 53°F1016.6 hPa53°F
PRYC1 - 9415020 - Point Reyes, CA 18 mi48 min W 5.1 G 9.9 55°F1016.2 hPa
46214 - Point Reyes, CA (029) 33 mi48 min 54°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi88 min WNW 5.8 G 7.8 55°F 55°F5 ft1016.3 hPa (-0.4)
46237 - San Francisco Bar, CA (142) 37 mi48 min 55°F5 ft
RCMC1 - 9414863 - Richmond, CA 38 mi48 min W 2.9 G 5.1 54°F 59°F1016 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 38 mi51 min SW 6 53°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi48 min WSW 1.9 G 2.9 55°F 1016.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi48 min SW 8.9 G 12 56°F 1015.5 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi48 min WNW 8 G 12 54°F 57°F1016.6 hPa
PXSC1 44 mi48 min 55°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi48 min WSW 4.1 G 11 54°F 1015.3 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi48 min WSW 7 G 11 55°F 1016.2 hPa
OBXC1 46 mi48 min 55°F 54°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi48 min WSW 11 G 13
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi48 min WSW 9.9 G 14 55°F 63°F1015.8 hPa53°F
AAMC1 - 9414750 - Alameda, CA 49 mi48 min WNW 5.1 G 8 55°F 62°F1016.9 hPa
LNDC1 49 mi48 min WSW 8 G 11 55°F 1016.3 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA20 mi25 minSSE 310.00 miSmoke50°F48°F93%1014.9 hPa
Petaluma Municipal Airport, CA20 mi23 minWNW 710.00 miOvercast54°F53°F100%1016.3 hPa
Novato / Gnoss Field, CA24 mi43 minN 010.00 miOvercast52°F50°F94%1016.3 hPa

Wind History from O69 (wind in knots)
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Last 24hrCalmCalmCalmNW3CalmN3CalmN3W5NW4W3CalmNW5W10
G17
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5NW4W65W5W7
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1 day agoCalmCalmW4CalmCalm4W4Calm--CalmCalmCalmW3W6NW8
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalm--CalmS533S4CalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Tomales Bay entrance, California
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Tomales Bay Entrance
Click for Map
Thu -- 05:40 AM PDT     1.05 feet Low Tide
Thu -- 07:10 AM PDT     Moonrise
Thu -- 07:25 AM PDT     Sunrise
Thu -- 11:43 AM PDT     5.21 feet High Tide
Thu -- 12:12 PM PDT     New Moon
Thu -- 06:22 PM PDT     0.16 feet Low Tide
Thu -- 06:27 PM PDT     Sunset
Thu -- 06:52 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.54.23.42.61.71.21.11.52.43.44.45.15.24.83.92.81.60.70.20.30.91.92.93.8

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Thu -- 12:28 AM PDT     -0.00 knots Slack
Thu -- 03:10 AM PDT     -1.05 knots Max Ebb
Thu -- 06:43 AM PDT     0.00 knots Slack
Thu -- 07:11 AM PDT     Moonrise
Thu -- 07:25 AM PDT     Sunrise
Thu -- 09:36 AM PDT     1.02 knots Max Flood
Thu -- 12:12 PM PDT     New Moon
Thu -- 12:30 PM PDT     -0.00 knots Slack
Thu -- 03:27 PM PDT     -1.28 knots Max Ebb
Thu -- 06:28 PM PDT     Sunset
Thu -- 06:52 PM PDT     Moonset
Thu -- 07:12 PM PDT     0.00 knots Slack
Thu -- 10:11 PM PDT     1.11 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.3-0.8-1-1-0.8-0.40.20.7110.80.3-0.3-0.9-1.3-1.2-1-0.7-0.10.50.91.11

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 (5,6,7,8)
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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.