Friday, November21, 2014 L-36.com


Marine Weather and Tides
Dillon Beach, CA

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6/17/2014 - I reported slow load times to NOAA and they quickly resolved the problem. Sorry for any inconvience. NOAA had some stuck processes on two servers. This was a problem on 5 to 10% of the requests.
6/10/2014 - Marine Zones updated. Some zones have changed. Edit your Marine Forecast section to check.

Sunrise 6:58AMSunset 4:55PM Friday November 21, 2014 2:01 AM PST (10:01 UTC) Moonrise 6:02AMMoonset 4:43PM 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- 906 Pm Pst Thu Nov 20 2014
Tonight..S winds 5 to 15 kt...becoming E after midnight. Wind waves 1 to 3 ft. W swell 7 to 9 ft at 10 seconds.
Fri..SE winds 10 kt. Wind waves 2 ft or less. W swell 7 to 9 ft at 13 seconds. Chance of rain in the afternoon.
Fri night..S winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 6 to 8 ft at 12 seconds. Rain likely in the evening...then rain after midnight.
Sat..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 8 to 10 ft at 12 seconds. Rain likely in the morning...then showers likely in the afternoon.
Sat night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 9 ft at 14 seconds. Slight chance of showers in the evening.
Sun..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 8 to 10 ft.
Mon..NW winds 10 kt. Wind waves 2 ft or less. W swell 8 to 10 ft.
Tue..N winds 5 kt. Wind waves 2 ft or less. W swell 5 to 7 ft.
PZZ500 906 Pm Pst Thu Nov 20 2014
Synopsis for the central california coast and bays including Monterey bay national marine sanctuaries.. Light winds with a few lingering showers overnight. On Friday southerly winds will develop again ahead of a stronger system passing to our north. That front will drop into the waters Saturday morning with rain and increasing winds. Behind the front stronger nw winds will develop Saturday afternoon into Sunday along with building nw seas.

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 210549
afdmtr
area forecast discussion
national weather service san francisco bay area
949 pm pst Thu nov 20 2014

Synopsis Scattered showers will continue across the southern
portion of the region through about midnight Thursday night. Dry
weather is then forecast from late Thursday night through most of
Friday. The next storm system will spread rain across the region
from north to south from late Friday through midday Saturday. Dry
weather will return by Sunday and continue through thanksgiving
day.

Discussion As of 9:00 pm pst Thursday... Today's 00z oak
sounding illustrates just how unstable the airmass was late this
afternoon behind a departing cold front... Showing an LI of minus 3
and a CAPE value of 780 j/kg. Widespread shower activity was
observed across our area from late afternoon through early
evening. The most intense shower activity was over the coastal
waters between the golden gate and monterey bay... Inland across
southern san mateo county... And locally over and near san
francisco bay. In these areas isolated thunderstorms also
developed. Rain rates were heavy in these showers and
thunderstorms. The la honda raws station... Located south of
highway 84 in southern san mateo county... Picked up nearly 7
tenths of an inch of rain over two hours late this afternoon.

Shower activity continues to taper off from north to south at the
present time... With nearly all convective activity now from santa
cruz county southward. Also... Intensity of these showers has
decreased. The 00z NAM indicates all shower activity will end by
about midnight and this looks good given recent radar trends. A
forecast update from earlier this evening included a removal of
rain chances for most areas after midnight tonight. Forecast
update also added patchy fog for portions of the north and east
bay valleys overnight and into Friday morning. The visibility at
the sonoma county airport has already dropped to 1/4 mile.

Friday is shaping up to be a partly cloudy and dry day. The models
agree that the next system... Currently developing off the coast of
the pacific northwest... Will not begin to spread rain into our
forecast area until late Friday afternoon... And only then across
the northern reaches of the north bay. Rain is then expected to
spread slowly south across the north bay to near san francisco by
late Friday night and then south to the monterey bay area by late
Saturday morning. This timing is somewhat slower than previously
thought and the forecast update from earlier this evening included
a reduction of pops for Friday afternoon and Friday night. This
Friday night/Saturday system looks similar in strength to the one
that is currently exiting our area... Although it is expected to
have somewhat more moisture to work with. Rain totals from late
Friday through late Saturday are forecast to be in the quarter to
half inch range across most of the sf bay area and south into santa
cruz county... Except locally an inch or more in the north bay
mountains. Farther to the south... In monterey and san benito
counties... Rainfall totals are expected to mostly be less than a
quarter of an inch.

Precipitation is forecast to end by late Saturday evening and the
second half of the weekend will be dry. Dry and mild weather is
then forecast to continue through at least thanksgiving day as the
persistent west coast ridge once again dominates our weather.

Aviation As of 9:49 pm pst Thursday... For 06z tafs. Last shower
activity currently over kmry and ksns and should be ending
overnight. Some 1/4 mile fog has already developed at ksts and
will likely stay in place through early morning hours. Cloud
heights in general throughout the bay area are above 3000 feet.

Tafs will account for some lowering of CIGS by sunrise but then
medium confidence forVFR by 18z Friday for bay area terminals.

Next storm moves into the north bay late Friday night and wont
impact sf bay until Saturday.

Vicinity of ksfo... Expecting CIGS 3000 feet and higher overnight
then lowering to MVFR by 12-14z Friday before mixing out by 17-18z.

Ksfo bridge approach... Similar to ksfo.

Monterey bay area terminals... Lingering -shra til around midnight
then slow clearing overnight into Friday morning. Some concern for
patchy fog around sunrise but wont show in TAF for now.

Marine As of 09:42 pm pst Thursday... Light winds with a few
lingering showers overnight. On Friday southerly winds will
develop again ahead of a stronger system passing to our north.

That front will drop into the waters Saturday morning with rain
and increasing winds. Behind the front stronger NW winds will
develop Saturday afternoon into Sunday along with building nw
seas.

Mtr watches/warnings/advisories
Tngt None.

Public forecast: dykema
aviation/marine: rww
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 mi72 min E 12 G 14 56°F 60°F7 ft1017.2 hPa (+0.4)
PRYC1 - 9415020 - Point Reyes, CA 18 mi32 min NNE 4.1 G 5.1 56°F 58°F1016.6 hPa
46214 - Point Reyes, CA (029) 33 mi51 min 61°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi72 min NNE 3.9 G 5.8 58°F 58°F7 ft1017.4 hPa (+0.5)
46237 - San Francisco Bar, CA (142) 37 mi20 min 58°F5 ft
RCMC1 - 9414863 - Richmond, CA 38 mi32 min NNE 5.1 G 8 55°F 60°F1016.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi32 min NNE 2.9 G 5.1 56°F 1017.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi32 min E 5.1 G 6 55°F 1016.9 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi32 min N 8 G 8.9 55°F 59°F1017.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi32 min NW 4.1 G 5.1 56°F 1016.2 hPa
PXSC1 44 mi32 min 57°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi32 min Calm G 1.9 56°F 1017.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi32 min NNE 1.9 G 1.9
OBXC1 46 mi32 min 56°F 52°F
UPBC1 48 mi32 min ENE 5.1 G 6
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi32 min ENE 4.1 G 5.1 55°F 59°F1016.7 hPa53°F
AAMC1 - 9414750 - Alameda, CA 49 mi32 min NNE 2.9 G 2.9 55°F 60°F1016.6 hPa
LNDC1 49 mi32 min ENE 2.9 G 2.9 56°F 1017 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa (awos), CA20 mi69 minN 71.25 miFog/Mist49°F48°F97%1016.9 hPa
Petaluma Muni, CA20 mi67 minW 47.00 miOvercast46°F46°F100%1018.3 hPa
Novato/Gnoss Field Airport, CA24 mi67 minN 3 miOvercast0°F0°F%1017.6 hPa

Wind History from O69 (wind in knots)
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Last 24hrSW3CalmCalmCalmSE4SE4SE3SE5SE4E4SE5E8
G14
SE5E4SE7E3E4E4SW3NW3CalmCalmNW3W4
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2 days agoE3SE4SE3SE4E4SE5S8SE10
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Tide / Current Tables for Tomales Bay entrance, California
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Tomales Bay Entrance
Click for Map
Fri -- 03:48 AM PST     2.05 feet Low Tide
Fri -- 06:01 AM PST     Moonrise
Fri -- 06:59 AM PST     Sunrise
Fri -- 09:48 AM PST     5.54 feet High Tide
Fri -- 04:43 PM PST     Moonset
Fri -- 04:55 PM PST     Sunset
Fri -- 05:00 PM PST     -0.51 feet Low Tide
Fri -- 11:28 PM PST     3.98 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.63.12.62.22.12.333.94.75.45.55.14.33.11.70.6-0.2-0.5-0.20.51.62.73.53.9

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Fri -- 01:37 AM PST     -0.77 knots Max Ebb
Fri -- 04:54 AM PST     0.00 knots Slack
Fri -- 06:01 AM PST     Moonrise
Fri -- 06:59 AM PST     Sunrise
Fri -- 07:47 AM PST     0.85 knots Max Flood
Fri -- 10:39 AM PST     -0.00 knots Slack
Fri -- 01:52 PM PST     -1.44 knots Max Ebb
Fri -- 04:44 PM PST     Moonset
Fri -- 04:56 PM PST     Sunset
Fri -- 05:48 PM PST     0.00 knots Slack
Fri -- 08:45 PM PST     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.3-0.7-0.8-0.6-0.300.40.80.80.70.3-0.2-0.8-1.3-1.4-1.2-0.9-0.40.10.711.10.90.6

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.