Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Mendocino, 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 6:59AMSunset 7:11PM Thursday September 21, 2017 12:42 PM PDT (19:42 UTC) Moonrise 7:27AMMoonset 7:24PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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PZZ455 Cape Mendocino To Pt Arena Out 10 Nm- 858 Am Pdt Thu Sep 21 2017
Today..NW winds 10 to 20 kt. Waves nw 5 ft at 5 seconds...and nw 8 ft at 11 seconds.
Tonight..NW winds 5 to 15 kt. Waves nw 7 ft at 8 seconds.
Fri..NW winds 10 to 20 kt. Gusts up to 30 kt. Waves nw 8 ft at 7 seconds.
Fri night..N winds 5 to 15 kt. Waves N 4 ft at 5 seconds... And nw 6 ft at 10 seconds.
Sat..N winds 5 to 15 kt. Waves N 5 ft at 6 seconds...and nw 3 ft at 10 seconds.
Sun..NW winds 5 to 15 kt. Waves N 4 ft at 6 seconds...and nw 2 ft at 11 seconds.
Mon..N winds 5 to 15 kt. Waves N 5 ft at 7 seconds...and nw 2 ft at 13 seconds.
PZZ400 858 Am Pdt Thu Sep 21 2017
Synopsis for northern california waters..The large northwesterly swell will subside through the rest of the week. Building high pressure will bring increasing northerly winds tomorrow and into the weekend.

7 Day Forecast for Marine Location Near Mendocino, CA
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location: 39.3, -123.8     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 211159
afdeka
area forecast discussion
national weather service eureka ca
459 am pdt Thu sep 21 2017

Synopsis Cool weather will persist through Friday as a cold
air mass from the gulf of alaska drops south before translating
eastward into the great basin tonight. A few showers will linger
today and then wind down on Friday. High pressure will rebuild
this weekend leading to a warming and drying trend that will last
into the early portion of next week.

Discussion Isolated showers and low topped thunderstorms
over the coastal waters have been paralleling the coastline
through the night. The upper trough has been digging southwestward
which has prevented the showers and storms from moving onto the
coast and over land. Models continue to indicate instability
arising from the cold air over the warmer waters through early
morning. Thus will keep isolated tstms in the waters til 8am.

The storms should end by then.

A weak trough offshore the SW oregon coast will shift eastward
later today and may produce isolated showers for del norte and far
northern humboldt counties as winds shift around to the NW after
the trough moves onshore. Most all the deterministic models have
this wave dampening out significantly today and generate no
precip. The ECMWF is the only model that still generates light
qpf. Also, the air aloft will be cold today, around -20c to
-25c. Forecast lapse rates are steep and suspect we will see a
fair amount of cumulus clouds sprouting up with the heating of the
day. A few light terrain driven showers will be possible.

Skies have been partly cloudy to clear across eastern trinity and
northern mendocino counties through the night. Temperatures were
still above 36f as of 4am, but slowly falling. Dew points have
been fairly high at these locations. The advisory may need to be
cancelled around 6am if temperatures do not fall to 36f or less.

It is interesting to note that several raws above 3000 feet have
been in the mid to upper 30s.

The threat for frost will continue tonight into early Friday
morning as the cold trough aloft heads into the great basin.

Stronger subsidence will promote greater drying tonight in the
interior valleys. It looks even colder tonight. Another frost
advisory will be necessary for eastern trinity and northern
mendocino counties. A few valley sites below 3000 feet in
central eastern trinity county may dip to 32f or less. Early
morning minimums should moderate on Saturday, however a few
valley sites may still dip into the mid to upper 30s as dew
points decrease each day and skies remain mostly clear.

High temperatures will start to trend upward this weekend as an
offshore ridge builds closer to the coast. Offshore flow this
weekend will limit coastal stratus and fog development. So coastal
areas will see warming as well. Sea breezes in the afternoon
should keep coastal temps in the mid 60s to lower 70s. Even with
warmer air over the region this weekend, early mornings will be
very fall like and a tad chilly especially across the interior
valleys. The warm up will likely peak around Mon or Tue as the
mid level ridge axis transitions across the forecast area. The
models are starting to latch onto upstream shortwave energy that
will likely buck up against the ridge around mid next week. These
shortwaves may not be sufficient to break the ridge down, but
should generate occasional high clouds and perhaps an increase in
coastal stratus.

Aviation An upper level trough moving over the area this morning.

This is keeping the atmosphere mixed well enough to keep fog from
forming along the coast. Some fog and stratus has likely formed in
some of the northern interior valleys. This fog is expected to lift,
but mid level clouds are expected to return early in the afternoon
in the north. MainlyVFR conditions are expected along the coast.

Tonight fog is possible again in the northern inland areas, but
offshore flow is expected to keep the coast mainly clear. Mkk

Marine The northerly swell continues to slowly diminish this
morning and is currently around 9 feet at 11 seconds. This will
continue to slowly diminish through the weekend. Northerly winds of
5 to 15 kt are currently in impacting the waters. These will persist
through Friday morning. Friday the upper level trough pushes off to
the east and high pressure starts to build into the area. This will
increase northerly winds and steep short period seas through the
weekend and into early next week. Winds will peak near gale force
and steep seas will peak around 11 feet.

Tuesday into Wednesday another shortwave will approach the area and
this is expected to break up the pressure gradient and diminish the
winds and seas. Models are in general agreement on this, although
the ECMWF is a bit slower than the gfs. Generally sided with the
ecmwf and a slower solution. The seas will diminish as well as the
waves are mainly wind driven. Mkk

Eka watches warnings advisories
Ca... Frost advisory until 8 am pdt this morning for caz107-108-110-
111.

Northwest california coastal waters... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46014 - PT ARENA - 19NM North of Point Arena, CA 10 mi33 min N 12 G 16 1014.4 hPa
ANVC1 - 9416841 - Arena Cove, CA 27 mi43 min WNW 12 G 15 58°F 53°F1014.7 hPa (+0.0)

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA34 mi47 minNW 9 G 1410.00 miFair64°F41°F43%1012 hPa

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Last 24hr5NW10
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N6N5W3CalmCalmSW4CalmE3Calm3N46NW9
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N7N5N7N8N7N3N3CalmNW5W3CalmN3CalmCalmSE5Calm6NW8
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NW6N6N9NW9NW8NW10E3NW6NW6N5NW5NW8CalmCalmN5N7N9NW11
G16

Tide / Current Tables for Mendocino, Mendocino Bay, California
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Mendocino
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Thu -- 12:14 AM PDT     5.63 feet High Tide
Thu -- 06:20 AM PDT     0.59 feet Low Tide
Thu -- 07:02 AM PDT     Sunrise
Thu -- 08:26 AM PDT     Moonrise
Thu -- 12:37 PM PDT     5.60 feet High Tide
Thu -- 06:44 PM PDT     0.64 feet Low Tide
Thu -- 07:13 PM PDT     Sunset
Thu -- 08:24 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.65.44.73.52.21.20.60.71.42.53.74.85.55.6542.71.60.80.71.123.14.2

Tide / Current Tables for Point Cabrillo, California Current
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Point Cabrillo
Click for Map
Thu -- 01:00 AM PDT     -0.00 knots Slack
Thu -- 03:47 AM PDT     -1.23 knots Max Ebb
Thu -- 07:02 AM PDT     Sunrise
Thu -- 07:26 AM PDT     0.00 knots Slack
Thu -- 08:26 AM PDT     Moonrise
Thu -- 10:18 AM PDT     1.09 knots Max Flood
Thu -- 01:19 PM PDT     -0.00 knots Slack
Thu -- 04:07 PM PDT     -1.23 knots Max Ebb
Thu -- 07:13 PM PDT     Sunset
Thu -- 07:47 PM PDT     0.00 knots Slack
Thu -- 08:24 PM PDT     Moonset
Thu -- 10:41 PM PDT     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60-0.7-1.1-1.2-1.1-0.7-0.30.30.81.110.70.2-0.5-1-1.2-1.1-0.9-0.40.10.711.1

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