Tuesday, October21, 2014 L-36.com


Marine Weather and Tides
Dillon Beach, CA

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6/10/2014 - Marine Zones updated. Some zones have changed. Edit your Marine Forecast section to check.

Sunrise 7:25AMSunset 6:25PM Tuesday October 21, 2014 9:43 AM PDT (16:43 UTC) Moonrise 4:18AMMoonset 4:21PM Illumination 4% 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- 921 Am Pdt Tue Oct 21 2014
Today..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 10 to 13 ft at 14 seconds.
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 9 ft at 12 seconds.
Wed..N winds 10 kt...becoming se in the afternoon. Wind waves 2 ft or less...becoming 3 ft in the afternoon. NW swell 7 to 9 ft at 12 seconds.
Wed night..S winds 10 kt. Wind waves 2 ft or less. W swell 8 to 10 ft at 13 seconds. Slight chance of rain after midnight.
Thu..SE winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. W swell 8 to 10 ft at 12 seconds. Chance of rain.
Fri..SE winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 7 to 9 ft. Chance of rain.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. W swell 8 to 10 ft. Chance of rain...then slight chance of rain.
PZZ500 921 Am Pdt Tue Oct 21 2014
Synopsis for the central california coast and bays including Monterey bay national marine sanctuaries.. Northwest winds over the coastal waters will increase today as high pressure builds over the eastern pacific. The strongest winds will be near the coast south of point sur. Large moderate period northwest swell will continue to move through the waters today before decreasing tonight.

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 211627
afdmtr
area forecast discussion
national weather service san francisco bay area
927 am pdt Tue oct 21 2014

Synopsis Dry weather with seasonable temperatures are expected
both today and Wednesday. The next storm will bring a chance of
rain to the north bay Thursday. Another system will bring a good
chance of rain to most of the district Friday or Saturday.

Discussion As of 09:21 am pdt Tuesday... The ongoing forecast
remains on track for today. Made only a few minor updates to
reflect current trends across the region. For more details... See
the forecast discussion below.

Prev discussion As of 3:00 am pdt Tuesday... Generally clear
start to the day with fairly light winds and drier air has lead to
a cooler start. Temps have dropped into the 40s to lower 50s in
many spots (which is 6 to 12 degrees cooler than Monday morning at
this time). Highs are forecast to be close to what we saw
yesterday -- mid 60s to lower 70s in most locations. Similar
weather is forecast for Wednesday although with a slight increase
in 500 mb heights, highs should warm a few degrees.

By Thursday a shortwave trough associated with an area of low
pressure over the gulf of alaska will approach norcal. Rainfall
will generally stay to the north of our area, although some rain
could make it down into the north bay on Thursday. Amounts should
be light although locally 1/3" is possible over the north bay
mountains. Almost all of the guidance has rainfall amounts
dropping off to near zero down to around san francisco, so
expectations are it will be very limited in area. Worth noting
that the gem solution remains the most bullish with rainfall
amounts and coverage (even bringing some down to monterey bay).

This is a big outlier from the other models (including how the
end of the NAM is trending by Friday morning), so will discount
it for now.

Things get more interesting for Friday and Saturday as the main
cold front associated with the low moves to the coast. It has
been fun to watch the evolution of the models with this system. A
few days ago, all indications were the rain would stay to our
north and the front would fall apart near our area. Run after run
has gotten wetter and now all of the main operational models show
a fairly impressive band of moisture moving through our area some
time between Friday night and Saturday. The ECMWF which had been
the driest of the solutions is now notably wetter than even just
24 hours ago. It brings 1/3"-1/2" around sf with locally more
than 2/3" over the north bay. GFS is showing similar numbers
while the gem brings 1-2" to the north bay with around 1/2" to sf
and monterey bay. Still a few days out, so would like to see some
of the higher resolution models before advertising healthy
rainfall amounts. However, pops were increased due to the better
model agreement. Winds could also be gusty ahead of the front
with 20-30 mph possible especially for SW facing spots near the
coast.

Quiet weather returns for Sunday through at least Tuesday as the
storm track shifts back to the north.

Aviation As of 04:30 am pdt Tuesday... Mostly clear skies this
morning in the wake of the cold front yesterday. Patchy high
clouds to move through later today. Light winds continue through
the day. High confidence.

Vicinity of ksfo...VFR through the forecast period. Mostly light
winds this morning... Increasing to around 15 kt out of the west in
the afternoon.

Ksfo bridge approach... Similar as ksfo.

Monterey bay area terminals...VFR. Mostly light winds... Offshore
in the morning before switching onshore in the afternoon.

Marine As of 09:21 am pdt Tuesday... Northwest winds over the
coastal waters will increase today as high pressure builds over
the eastern pacific. The strongest winds will be near the coast
south of point sur. Large moderate period northwest swell will
continue to move through the waters today before decreasing
tonight.

Mtr watches/warnings/advisories
Tday Sca... Rough bar advisory for sf bar
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: rgass
aviation: ac
marine: johnson
visit us at weather.Gov/sanfrancisco
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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 mi53 min N 3.9 G 7.8 60°F 62°F13 ft1019.6 hPa (+0.7)
PRYC1 - 9415020 - Point Reyes, CA 18 mi43 min NW 2.9 G 5.1 59°F 60°F1019.7 hPa (+1.0)
46214 - Point Reyes, CA (029) 33 mi32 min 63°F14 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi53 min N 5.8 G 7.8 59°F 61°F10 ft1020.1 hPa (+1.2)
46237 - San Francisco Bar, CA (142) 37 mi31 min 61°F10 ft
RCMC1 - 9414863 - Richmond, CA 38 mi43 min N 5.1 G 7 58°F 64°F1019.9 hPa (+1.4)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi43 min NNE 7 G 9.9 58°F 1020 hPa (+1.3)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi49 min ENE 2.9 G 4.1 55°F 1019.7 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi43 min NNE 4.1 G 5.1 59°F 63°F1020 hPa (+1.3)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi43 min NNW 2.9 G 6 59°F 1018.8 hPa (+1.4)
PXSC1 44 mi43 min 60°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi43 min N 7 G 9.9 58°F 1019.9 hPa (+1.5)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi43 min N 8 G 9.9
OBXC1 46 mi43 min 59°F 53°F
UPBC1 48 mi43 min WNW 6 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi43 min W 5.1 G 7 56°F 66°F1019.1 hPa (+1.3)49°F
AAMC1 - 9414750 - Alameda, CA 49 mi43 min NNW 5.1 G 8 59°F 66°F1019.8 hPa (+1.5)
LNDC1 49 mi43 min N 6 G 9.9 58°F 1019.8 hPa (+1.4)

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa (awos), CA20 mi50 minN 010.00 miPartly Cloudy49°F48°F97%1018.9 hPa
Petaluma Muni, CA20 mi48 minN 09.00 miPartly Cloudy48°F48°F100%1020.7 hPa
Novato/Gnoss Field Airport, CA24 mi68 minNNE 310.00 miFair50°F50°F100%1020 hPa

Wind History from O69 (wind in knots)
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Last 24hrW7W7W10W11W11
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W9W6W6CalmCalmCalmCalmCalmN3CalmNW4N3CalmCalmCalmW3
1 day agoCalmNW4NW4NW4W12
G15
W9NW6NW6NW6NW4NW4NW3NW5NW5N3CalmCalmCalmCalmNE3E3CalmCalmW8
2 days agoCalmCalmSW3W4W4W11
G14
NW8W11NW9NW3W6CalmCalmNW3W4NW3W3CalmCalmNW4CalmNW3CalmW3

Tide / Current Tables for Tomales Bay entrance, California
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Tomales Bay Entrance
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Tue -- 04:26 AM PDT     1.23 feet Low Tide
Tue -- 05:17 AM PDT     Moonrise
Tue -- 07:26 AM PDT     Sunrise
Tue -- 10:32 AM PDT     4.84 feet High Tide
Tue -- 05:08 PM PDT     0.65 feet Low Tide
Tue -- 05:21 PM PDT     Moonset
Tue -- 06:25 PM PDT     Sunset
Tue -- 11:10 PM PDT     4.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.732.31.61.31.31.82.63.54.34.84.84.43.62.61.710.70.81.42.33.23.94.2

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Tue -- 01:45 AM PDT     -0.90 knots Max Ebb
Tue -- 05:18 AM PDT     Moonrise
Tue -- 05:25 AM PDT     0.00 knots Slack
Tue -- 07:26 AM PDT     Sunrise
Tue -- 08:19 AM PDT     0.88 knots Max Flood
Tue -- 11:15 AM PDT     -0.00 knots Slack
Tue -- 02:06 PM PDT     -1.10 knots Max Ebb
Tue -- 05:21 PM PDT     Moonset
Tue -- 05:57 PM PDT     0.00 knots Slack
Tue -- 06:26 PM PDT     Sunset
Tue -- 08:50 PM PDT     0.93 knots Max Flood
Tue -- 11:53 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.8-0.9-0.8-0.6-0.20.30.70.90.80.60.1-0.4-0.9-1.1-1-0.8-0.500.50.90.90.80.5

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 (12,3,4,5)
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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.