Thursday, March30, 2017 L-36.com


Marine Weather and Tides
Mendocino, 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 6:58AMSunset 7:35PM Wednesday March 29, 2017 11:41 PM PDT (06:41 UTC) Moonrise 7:20AMMoonset 8:44PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 908 Pm Pdt Wed Mar 29 2017
.small craft advisory in effect until 3 am Thursday...
Tonight..NW winds 15 to 25 kt. Waves nw 11 ft at 15 seconds. A chance of rain.
Thu..N winds 15 to 25 kt with occasional gusts to 35 kt. Waves nw 11 ft at 14 seconds.
Thu night..N winds 20 to 30 kt with occasional gusts to 35 kt. Waves nw 8 ft at 8 seconds...and W 7 ft at 14 seconds.
Fri..N winds 10 to 20 kt. Waves nw 9 ft at 13 seconds.
Fri night..N winds 10 to 20 kt. Waves nw 6 ft at 8 seconds... And nw 7 ft at 14 seconds.
Sat..N winds 10 to 20 kt. Waves nw 12 ft at 15 seconds.
Sun..NW winds 15 to 25 kt. Waves nw 14 ft at 15 seconds.
Mon..NW winds 10 to 20 kt. Waves nw 12 ft at 16 seconds.
PZZ400 908 Pm Pdt Wed Mar 29 2017
Synopsis for northern california waters..A westerly swell will continue propagating across the waters this week. A weak cold front will move across the waters tonight...shifting winds to the north and leading to steeper seas.

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 292301
afdeka
area forecast discussion
national weather service eureka ca
401 pm pdt Wed mar 29 2017

Synopsis
Showers and higher elevation snow showers will persist through
mainly Thursday morning, before drier conditions return for the
weekend. However, a change in the weather pattern may offer
increased rainfall potential for portions of next week.

Discussion
Short term
(tonight through Thursday evening)
as a cold front crosses the region, shower coverage should increase
some overnight, with the highest rainfall amounts found over
interior portions of humboldt and del norte counties. With the
resultant increased cloud cover, low temperatures tonight will be a
few degrees warmer than last night, with near seasonal values
expected.

Precipitation will become more showery while decreasing in coverage
on Thursday. Colder air aloft will briefly filter into the region,
dropping snow levels down to near 4000 feet. Precipitation amounts
will be light with mixing ratios averaging about 6:1. Still, a light
dusting on a few area passes can't be ruled out. Otherwise, look for
decreasing cloud cover as we head through the day, with afternoon
highs topping out in the mid 50s to mid 60s, warmest across
mendocino county. With mainly clear skies and light winds, some
frost may develop across portions of the interior mendocino valleys
Thursday night/Friday morning.

Another forecast challenge will be the strength of the northerly
winds behind the front on Thursday and then again on Friday as high
pressure builds toward the coast. With northerly flow stacked up
from the surface to 500mb, there is a potential for breezy (15-
25mph) and locally windy (20-30mph) conditions at the coast.

Long term
(Friday evening through Wednesday)
the ridge will flatten out and weaken on Saturday in response to
another short-wave trough. The models continue to struggle on what
to do with this shortwave. The GFS continues to be the most bullish
with driving the shortwave through the ridge and generating showers
over the interior with daytime heating on Sunday. The ECMWF has the
trough developing farther east on Sunday with much less potential
for showers. For now will continue to maintain fairly low shower
chances considering the high level of uncertainty. Another front
should approach around mid next week and bring a new chance of rain.

/pd/db

Aviation
A passing cold front will continue to result in light to
moderate rain across humboldt/del norte counties through this
evening. This will result in oscillations between ifr and MVFR
conditions at cec and acv, both due to low ceilings and reduced
visibility, with occasional dips to ifr at cec. Uki may see a few
very light showers, with a brief period of MVFR ceilings overnight
tonight.VFR conditions are expected to tomorrow morning at all
terminals, after perhaps some patchy localized fog in some areas.

/brc

Marine
A 10 ft... 15 second northwest swell continues to be the
dominant wave group throughout the waters today as winds remain
mostly light. This swell will continue to propagate through the
waters over the next few days, gradually decaying as it does so.

However, while the northwest swell will gradually subside, winds
will turn to the north as a cold front passes, and will gradually
increase to around 15 to 25 kt by tomorrow morning. While there will
be minor fluctuations in wind speeds throughout the next several
days, this will more or less remain constant through late Monday,
allowing steep northerly seas to develop in addition to the decaying
swell. Meanwhile, another long period northwest swell will build
into the waters late in the weekend, further adding to the sea
state. The end result will be that combined wave heights will remain
in the 9 to 12 ft range through roughly Sunday, but with a mix of
periods ranging from 6 to 8 seconds out of the north, to 13 to 16
seconds out of the northwest. Seas will increase to 12 to 15 feet as
the previously mentioned larger swell builds early next week. /brc

Eka watches/warnings/advisories
Ca... None.

Northwest california coastal waters... Small craft advisory until 9 pm pdt this evening for pzz450-455.

Small craft advisory until 3 pm pdt Friday for pzz470-475.

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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 mi31 min WNW 5.8 G 9.7 55°F 1021.5 hPa55°F
ANVC1 - 9416841 - Arena Cove, CA 27 mi41 min Calm G 1 55°F 52°F1022.4 hPa (+0.0)

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah, Ukiah Municipal Airport, CA34 mi45 minNNW 910.00 miOvercast58°F48°F72%1020 hPa

Wind History from UKI (wind in knots)
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Last 24hrCalmCalmCalmCalmNW3CalmE3CalmN4NW3N34N10N8NW7CalmNW11
G15
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N8N9NE6N4N6N9
1 day agoCalmNW3CalmSW3CalmCalmCalmCalmNW4N3CalmCalmCalmW13
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2 days agoN4S3NW3CalmN4N4CalmCalmCalmCalmSE3CalmN4NW8NW9
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N5N5N3CalmCalm

Tide / Current Tables for Mendocino, Mendocino Bay, California
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Mendocino
Click for Map
Thu -- 01:08 AM PDT     6.05 feet High Tide
Thu -- 07:02 AM PDT     Sunrise
Thu -- 07:36 AM PDT     -0.21 feet Low Tide
Thu -- 09:00 AM PDT     Moonrise
Thu -- 01:59 PM PDT     4.98 feet High Tide
Thu -- 07:32 PM PDT     1.19 feet Low Tide
Thu -- 07:37 PM PDT     Sunset
Thu -- 10:54 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.665.84.93.520.7-0.1-0.20.41.42.73.94.754.73.92.81.91.31.31.82.84

Tide / Current Tables for Point Cabrillo, California Current
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Point Cabrillo
Click for Map
Thu -- 01:45 AM PDT     -0.00 knots Slack
Thu -- 04:51 AM PDT     -1.47 knots Max Ebb
Thu -- 07:02 AM PDT     Sunrise
Thu -- 08:26 AM PDT     0.00 knots Slack
Thu -- 09:00 AM PDT     Moonrise
Thu -- 11:26 AM PDT     1.19 knots Max Flood
Thu -- 02:45 PM PDT     -0.00 knots Slack
Thu -- 05:20 PM PDT     -1.07 knots Max Ebb
Thu -- 07:37 PM PDT     Sunset
Thu -- 08:34 PM PDT     0.00 knots Slack
Thu -- 10:54 PM PDT     Moonset
Thu -- 11:32 PM PDT     0.97 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.4-0.1-0.8-1.3-1.5-1.2-0.8-0.20.30.81.21.10.90.4-0.2-0.7-1-1-0.7-0.20.20.60.9

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 (2,6,7,8)
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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.