Thursday, September29, 2016 L-36.com


Marine Weather and Tides
Dillon Beach, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:04AMSunset 6:56PM Thursday September 29, 2016 8:10 PM PDT (03:10 UTC) Moonrise 4:49AMMoonset 5:32PM Illumination 2% Phase: Waning Crescent; Moon at 28 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- 805 Pm Pdt Thu Sep 29 2016
.small craft advisory in effect through Friday evening...
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. Mixed swell nw 5 to 6 ft at 9 seconds and S 3 to 4 ft at 16 seconds. Patchy fog after midnight.
Fri..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. Mixed swell nw 4 to 6 ft at 10 seconds and S 3 to 4 ft at 15 seconds. Patchy fog in the morning.
Fri night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. Mixed swell nw 4 to 6 ft at 11 seconds and S 3 to 4 ft at 16 seconds. Patchy fog after midnight.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw 3 to 4 ft at 10 seconds and S 3 ft at 16 seconds. Patchy fog in the morning.
Sat night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw 4 to 6 ft at 10 seconds and S 3 ft at 16 seconds. Slight chance of rain after midnight.
Sun..W winds 10 kt. Wind waves 2 ft or less. Mixed swell W 4 to 6 ft and S 3 ft. Chance of showers and slight chance of Thunderstorms.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft. S swell 3 ft. Chance of showers.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft. Slight chance of showers.
PZZ500 805 Pm Pdt Thu Sep 29 2016
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds increase early Friday for the north coast and strengthen through the day. The strongest winds will be located along the sonoma coast north of pt reyes and along the big sur coastline by tomorrow afternoon. Strong winds will persist along the big sur coast...especially around point sur through Saturday. Winds decrease Sunday morning. Small mixed swell with a long period southerly swell through the period.

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 300021
afdmtr
area forecast discussion
national weather service san francisco bay area
521 pm pdt Thu sep 29 2016

Light rain returns for northern parts of our area starting on
Sunday...

Synopsis A cooling trend will continue through the weekend as
the marine layer and onshore flow become better established with a
trough deepening along the west coast. In addition, a dry cold
front will move through on Friday leading to breezy conditions. A
system will drop down from the north over the weekend which will
bring rain to our area especially over the north bay.

Discussion As of 1:38 pm pdt Thursday... Satellite imagery
shows most of the low cloudiness has cleared to the coast.

Exceptions include most of san francisco, point reyes, and much of
the monterey bay area. Afternoon temperatures are running much
cooler than those yesterday at this time with many readings in the
60s and 70s, with some areas as many as 16 degrees cooler than 24
hours ago. Locations right along the immediate coast are
struggling to hit 60 degrees, while even the warmest, well-inland
locations have only warmed into the 80s.

The cooling trend will continue Friday and into the weekend as an
upper level trough approaches the coast. A dry cold front will
move across the district on Friday resulting in an increase in
wind speeds, mainly over the coastal waters and areas near the
coast as well as in the near-coastal hills. Wind speeds of 15 to
25 mph with some higher gusts are possible in these areas during
the afternoon and evening.

On Sunday, the main upper trough will move through bringing rain
chances to mainly the north bay but some showers could occur from
around monterey bay northward. The proximity of the upper low will
also give the possibility of thunderstorms with these showers
late on Sunday. Rainfall estimates of around 0.20" in the north
bay still look reasonable, with around a tenth of an inch across
much of the san francisco bay. A few post-frontal showers are
expected to linger into Monday.

A flat ridge will rebuild over the west into the middle of next
week and possible longer bringing a slight warming trend to the
area. The 12z run of the ECMWF brings another round of showers to
the district possibly by next Sunday. Low confidence in that at
this time.

Aviation As of 5:21 pm pdt Thursday... Area-wide lower level
cooling will persist through Friday night. Presently, the marine
inversion is 1,200-1,500 feet. 3c-4c cooling at 925 mb tonight
with an additional 4c-5c cooling Friday will be sufficient to
completely erode the already weakened marine inversion, probably
by early Friday morning at the latest.

A moderate onshore wind driven by a 3.6 mb sfo-sac gradient gradually
subsides tonight then increases again to 4 mb Friday afternoon and
evening.

Peak of diurnal driven sea-breeze will coincide with the arrival
of a dry cold frontal passage moving south-southeast over the forecast
area Friday afternoon; gusty w-nw post-frontal winds expected mostly
later Friday into Saturday morning.

Vicinity of ksfo... Low-moderate confidenceVFR holds til 04z-05z.

West winds gusting into the 20 knot range til 04z-05z. Lighter
winds tonight, then gusty W winds to 30-34 knots Friday afternoon
and evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS due to stratus redeveloping this
evening between 02z-06z. Ifr tonight then clearing returning by
mid-late morning.

Fire weather As of 3 pm pdt Thursday... The main weather
message will be cooler and wetter conditions heading into the
weekend. The marine layer will deepen as a trough approaches the
region tonight. The biggest fire weather concern the next few days
will be a passing dry cold front Friday afternoon/evening. The
front will be gusty northwest winds 10 to 20 mph with gusts to 30
mph. Despite the cooler/wetter conditions history shows this could
be of concern given the current state of the fuels. Winds will be
peak Friday night and Saturday. Next item of concern will be
precip... Including thunderstorm chances. Loma fire appears more
likely to receive some light precip where the soberanes will be on
the edge. Instability increases Sunday afternoon over the north
bay then spreading south. Slight chc of thunderstorms will be
poss. Lal of 2.

Marine As of 10:53 am pdt Thursday... Weakening pressure
gradient today will bring generally light winds to the coastal
waters today. Winds beginning increase early Friday for the north
coast and strengthen through the day. The strongest winds will be
located along the sonoma coast north of pt reyes and along the big
sur coastline by tomorrow afternoon. Strong winds will persist
along the big sur coast... Especially around point sur through
Saturday. Winds decrease Sunday morning. Small mixed swell with a
long period southerly swell through the period.

Mtr watches/warnings/advisories
Tngt Sca... Sf bay until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt pinos to pt piedras blancas 0-10 nm from 9 pm
sca... Pt arena to pt reyes 0-10 nm
public forecast: sims
aviation: canepa
marine: drp
fire weather: mm
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 mi30 min NW 16 G 21 53°F 53°F1018.3 hPa52°F
PRYC1 - 9415020 - Point Reyes, CA 18 mi40 min WNW 11 G 14 56°F 57°F1018.1 hPa
46214 - Point Reyes, CA (029) 33 mi78 min 56°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi80 min NW 16 G 19 53°F 55°F5 ft1018.1 hPa (-0.6)
46237 - San Francisco Bar, CA (142) 37 mi78 min 57°F4 ft
RCMC1 - 9414863 - Richmond, CA 38 mi40 min WSW 5.1 G 8.9 60°F 63°F1017.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 38 mi51 min SW 11 58°F 65°F1017 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi40 min S 14 G 16 58°F 1017.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi40 min WSW 8.9 G 13 60°F 1016.3 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi40 min WSW 12 G 18 54°F 60°F1017.9 hPa
PXSC1 44 mi40 min 56°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi40 min WSW 2.9 G 11 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi40 min SW 12 G 16
OBXC1 46 mi46 min 56°F 53°F
UPBC1 48 mi40 min WNW 11 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi40 min WNW 9.9 G 11 64°F 68°F1015.6 hPa53°F
AAMC1 - 9414750 - Alameda, CA 49 mi40 min W 2.9 G 6 56°F 67°F1018.3 hPa
LNDC1 49 mi40 min WSW 8.9 G 11 57°F 1017.8 hPa

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA20 mi17 minSSE 810.00 miA Few Clouds53°F48°F86%1016.1 hPa
Petaluma Municipal Airport, CA20 mi15 minWNW 710.00 mi54°F50°F88%1018.6 hPa
Novato / Gnoss Field, CA24 mi35 minNNW 710.00 miFair55°F48°F77%1017.3 hPa

Wind History from O69 (wind in knots)
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Last 24hrNW7W8N3NW3NW5NW4NW4W5NW3N4NW4NW4NW4NW4NW4NW4NW7W9W9W10W9W10NW8
G14
W8
1 day agoNW6NW5NW4CalmCalmCalmCalmCalmNW3NW3N3N3W4CalmNW4NW4W3N3W8W9NW6
G14
W12NW8NW9
2 days agoN3NW3CalmN3N3CalmCalmCalmCalmCalmW3CalmW3CalmCalmS5S4S5W3NW5NW8NW8NW7NW7

Tide / Current Tables for Tomales Bay entrance, California
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Tomales Bay Entrance
Click for Map
Thu -- 05:13 AM PDT     0.47 feet Low Tide
Thu -- 05:48 AM PDT     Moonrise
Thu -- 07:06 AM PDT     Sunrise
Thu -- 11:26 AM PDT     4.78 feet High Tide
Thu -- 05:35 PM PDT     0.99 feet Low Tide
Thu -- 06:32 PM PDT     Moonset
Thu -- 06:56 PM PDT     Sunset
Thu -- 11:31 PM PDT     4.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.43.72.71.70.90.50.61.32.33.44.34.74.74.23.42.41.61.111.52.33.34.24.6

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Thu -- 02:30 AM PDT     -1.14 knots Max Ebb
Thu -- 05:48 AM PDT     Moonrise
Thu -- 06:08 AM PDT     0.00 knots Slack
Thu -- 07:06 AM PDT     Sunrise
Thu -- 09:11 AM PDT     1.06 knots Max Flood
Thu -- 12:04 PM PDT     -0.00 knots Slack
Thu -- 02:55 PM PDT     -1.04 knots Max Ebb
Thu -- 06:27 PM PDT     0.00 knots Slack
Thu -- 06:32 PM PDT     Moonset
Thu -- 06:57 PM PDT     Sunset
Thu -- 09:24 PM PDT     1.00 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.3-0.9-1.1-1.1-1-0.6-0.10.50.91.110.60-0.6-0.9-1-0.9-0.7-0.30.30.8110.7

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 (23,6,7,8)
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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.