Wednesday, November22, 2017 L-36.com


Marine Weather and Tides
Westhaven-Moonstone, 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 7:11AMSunset 4:53PM Wednesday November 22, 2017 12:25 PM PST (20:25 UTC) Moonrise 10:36AMMoonset 8:29PM Illumination 17% Phase: Waxing Crescent; Moon at 4 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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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 905 Am Pst Wed Nov 22 2017
Today..S winds 5 to 15 kt. Gusts to 25 kt near cape mendocino. Waves S 5 ft at 6 seconds...and sw 9 ft at 12 seconds. A chance of rain.
Tonight..SE winds 5 to 15 kt. Waves S 5 ft at 6 seconds...and sw 8 ft at 12 seconds. Rain likely.
Thu..SW winds 5 to 15 kt. Waves sw 8 ft at 8 seconds...and nw 5 ft at 14 seconds. Rain.
Thu night..N winds 5 kt. Waves sw 7 ft at 12 seconds.
Fri..NE winds 5 kt. Waves sw 8 ft at 11 seconds.
Sat..S winds 10 to 20 kt. Waves S 7 ft at 7 seconds...and nw 10 ft at 15 seconds.
Sun..SW winds 10 to 20 kt. Waves S 6 ft at 8 seconds...and W 13 ft at 14 seconds.
PZZ400 905 Am Pst Wed Nov 22 2017
Synopsis for northern california waters..Moderate to fresh S winds will persist into Thursday morning with a brief return of light northerly winds for Friday. Seas will be mixed through Thursday, consisting of both steep southerly wind waves and westerly swells with varying periods. Winds will weaken substantially Thursday and Friday, but strong southerlies will return Saturday in addition to an even larger nw swell.

7 Day Forecast for Marine Location Near Westhaven-Moonstone, CA
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location: 41.05, -124.1     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 221616 cca
afdeka
area forecast discussion... Corrected
national weather service eureka ca
816 am pst Wed nov 22 2017

Synopsis A disintegrating frontal boundary has been moving
onshore this morning. Light rain will be possible across humboldt
and del norte counties today. Widespread light rain is expected
tonight with occasional showers Thursday. Friday looks mainly dry
before another system brings rain for the weekend.

Update Based on current radar trends updated weather and
precipitation grids to reflect the precipitation across humboldt
county. Rain showers will remain possible for the rest of the day
across del norte and humboldt counties. Newest high resolution
guidance shows the plume of moisture staying over our area rather
than across our coastal waters as was previously thought.

Prev discussion issued 419 am pst Wed nov 22 2017
discussion... The weakening frontal boundary remains off the ca
coast this morning. Models show this continuing to weaken and
eventually move onshore at some point tonight. The hrrr simulated
radar shows del norte county seeing occasional light rain through
much of the day. Late in the afternoon evening it shows some light
rain moving onshore in humboldt county. The warm temperatures are
expected to continue today due to southerly winds and high
pressure to the east of the area.

Tonight the front finally moves inland, although only light rain
is expected with it. This may linger into Thursday in trinity and
mendocino counties. Another wave will bring additional rain to
del norte county Thursday morning and a few showers may spread
into humboldt county in the afternoon and evening. Temperatures
will start to cool on Thursday, although will remain above
seasonal normals.

Thursday night the rain and clouds will start to move off to the
east of the area. Cooler overnight temperatures expected and
valley fog is likely. This fog may be dense at times, especially
in the interior valleys. Friday is expected to see partial
clearing in the morning in areas without low clouds and fog.

Friday afternoon the next system starts to approach the area. The
gfs and ECMWF show significant differences in the timing of the
warm frontal boundary that moves onshore Friday night from the
southwest. The GFS has moderate rain across much of the area,
while the ECMWF keeps the systems slightly farther offshore with
much lighter rain. Generally favored the GFS in the forecast as
it may have a better handle on warm front due to higher
resolution.

This spread in the models continues on Saturday with the ecmwf
continuing with a much drier solution. There is some agreement
that a frontal boundary will move through Sunday bring some rain
to much of the area. Sunday night and Monday the upper level
trough behind the front brings much colder air and showers to the
area. This could bring snow levels down to near 3,000 feet, near
highway pass levels. Drier weather is expected behind this trough
on Tuesday and Wednesday. Mkk
aviation...VFR conditions will persist along the coast through
at least the remainder of the morning. Rain associated with a weak
cold front will slowly move onto the coast during the day, initially
impacting cec during the late morning and eventually working its way
into acv during the evening and overnight. Ceilings will lower as
rain begins, initially to MVFR during daylight hours and perhaps to
ifr overnight. Ceiling and visibility reductions are likely to occur
at cec first, and will be more prolonged here than at acv. Some low
level wind shear is possible at cec and acv early this morning
before surface winds increase after sunrise. At uki, lifr fog will
dissipate by late morning, andVFR conditions are expected the
remainder of the day. Rain and lowering ceilings will arrive
tomorrow morning. Brc
marine... Moderate to strong southerlies will continue to blow
across the waters today and tonight, with the strongest winds
located outside of 10nm from shore and north of CAPE mendocino.

These winds will continue to drive steep southerly seas across the
outer waters, which will combine with both southwest and northwest
swells to create a mixed and uncomfortable sea state. Winds will
begin to weaken Thursday and turn to the north on Friday, allowing
the steep southerly seas to settle. However, the previously
mentioned swells will continue to maintain elevated seas throughout
the waters through the end of the work week.

On Saturday, southerly winds will increase yet again as another cold
front approaches, perhaps briefly reaching gale force. This will
bring the return of steep southerly waves, in addition to both a fresh
westerly swell and a long period northwesterly swell. In a nutshell,
seas will be large, mixed in both period and direction, and
hazardous to mariners late in the weekend. Brc

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... Small craft advisory until 4 am pst Thursday for pzz470.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46244 - Humboldt Bay, North Spit, CA 17 mi26 min 55°F10 ft
HBYC1 - 9418767 - North Spit, CA 21 mi50 min S 14 G 16 62°F 55°F1019.4 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 32 mi36 min S 16 G 19 60°F 56°F9 ft1018.1 hPa (+0.8)55°F
CECC1 - 9419750 - Crescent City, CA 48 mi44 min SSE 5.1 G 8 59°F 53°F1019.3 hPa

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Arcata / Eureka, Arcata Airport, CA4 mi33 minN 010.00 miOvercast63°F57°F84%1019.6 hPa

Wind History from ACV (wind in knots)
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Last 24hrS5S5SW5NE3NE5NE3E6SE5S7S8S5S8E6E5E5S10S5W7E4SE9SW17CalmNE3Calm
1 day agoSE10SE7SE8SE9SE9SE8SE10S7S3E3S6S3SE5SE8E12
G20
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2 days agoCalmNW4CalmE4E3E6E5SE8
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Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Wed -- 02:24 AM PST     5.56 feet High Tide
Wed -- 07:12 AM PST     Sunrise
Wed -- 07:25 AM PST     3.52 feet Low Tide
Wed -- 10:36 AM PST     Moonrise
Wed -- 01:03 PM PST     6.34 feet High Tide
Wed -- 04:52 PM PST     Sunset
Wed -- 08:12 PM PST     0.20 feet Low Tide
Wed -- 08:29 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.25.15.55.55.14.53.93.63.644.75.56.16.36.15.34.22.81.60.60.20.41.12.2

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Wed -- 03:15 AM PST     6.21 feet High Tide
Wed -- 07:12 AM PST     Sunrise
Wed -- 08:01 AM PST     3.75 feet Low Tide
Wed -- 10:35 AM PST     Moonrise
Wed -- 01:54 PM PST     7.36 feet High Tide
Wed -- 04:53 PM PST     Sunset
Wed -- 08:30 PM PST     Moonset
Wed -- 08:52 PM PST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.64.85.86.265.44.743.744.75.76.67.27.4764.52.81.30.300.51.5

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 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.