Friday, November16, 2018 L-36.com


Marine Weather and Tides
Westhaven-Moonstone, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:04AMSunset 4:57PM Friday November 16, 2018 11:49 AM PST (19:49 UTC) Moonrise 2:00PMMoonset 12:05AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 841 Am Pst Fri Nov 16 2018
Today..SW winds 5 kt. Waves nw 3 ft at 7 seconds...and nw 8 ft at 12 seconds. Haze and patchy smoke.
Tonight..S winds 5 to 10 kt. Waves nw 3 ft at 7 seconds...and nw 6 ft at 12 seconds. Haze and patchy smoke.
Sat..S winds 5 kt. Waves nw 3 ft at 6 seconds...and nw 7 ft at 13 seconds. Haze and patchy smoke.
Sat night..SE winds 5 kt. Waves W 6 ft at 14 seconds.
Sun..NW winds 5 kt. Waves W 5 ft at 13 seconds.
Mon..W winds 5 kt. Waves W 4 ft at 11 seconds.
Tue..S winds 5 to 10 kt. Waves S 2 ft at 3 seconds...and W 4 ft at 13 seconds.
PZZ400 841 Am Pst Fri Nov 16 2018
Synopsis for northern california waters..Northerly winds will continue to diminish today. Southerly winds are expected for the weekend peaking around 15 kt. A long period W to nw swell will diminish today with another long period swell building in on Sunday.


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 161241
afdeka
area forecast discussion
national weather service eureka ca
441 am pst Fri nov 16 2018

Synopsis Dry fall weather with mild afternoons and chilly
nights will continue through the weekend. Portions of northwest
california will experience periods of haze and lingering smoke
during the next couple of days that may yield poor air quality.

Otherwise, rain is expected to spread across the region during the
middle to later portions of next week.

Discussion An upper trough was positioned early Friday morning
from the alaska peninsula south toward the ncntrl nern pac. An
upper ridge was amplifying downstream from the trough, and is
forecast to move east across the west coast during the weekend.

Dry weather and large diurnal temperature swings will occur as a
result over nwrn ca. Meanwhile at the surface, weak low pressure
was beginning to develop offshore from the eka cwa. As that
feature continues to advance west across the ocean, marine
stratus currently located near the coast will temporarily be
shunted west through Friday night due to light offshore winds.

Thereafter, model guidance shows low-level southerlies developing
along the eastern periphery of the previously mentioned low. Those
southerlies will cause stratus to surge north along the coast
during Saturday and Sunday.

Going into next week... A pattern change appears probable. First,
the weekend ridge will shift east toward the intermountain west as
upper troughing develops over the nern pac. A cut-off low is
forecast to detach from the trough and enter cntrl SRN ca by
Monday night... Which will likely yield continued dry weather for
nwrn ca. However, model guidance shows a stronger trough
continuing to advance east toward nwrn ca during Tuesday and
Wednesday, with additional upper waves impacting the region during
the remainder of the week. At this time, model guidance is in
generally good agreement showing these mid to late week waves
producing periods of rain, with the onset of precipitation
occurring Tuesday night into Wednesday morning.

Aviation This morning most of the areas remainsVFR or MVFR as
of 3am. There is some stratus off the mendocino coast, but that
has only come onshore in one small area near point arena. Offshore
flow is keeping the rest of it off the coast. Some areas are
still seeing some slight vis reductions due to haze and mist. Some
of this stratus could move onto the mendocino coast this
afternoon, but confidence is low on this. Smoke from the "camp
fire" is expected to spread across the area again around midday.

This could bring MVFR or local ifr conditions this afternoon,
although the sea breeze may keep the coast in slightly better
conditions. Tonight continued east winds should keep most of the
stratus off the coast, but could bring additional smoke and haze.

Mkk

Marine Currently the main waves in the waters are a 9 to 10
foot swell around 13 seconds. This will continue to diminish
through the day, although it seems to be diminishing slower than
the enp model is showing. So have made some adjustments to the
model forecast. The northerly winds over 5 kt are confined to the
northwest quadrant of of the northern outer waters. Wind close to
the coast will be light and variable through the evening.

Tonight the swell will continue to diminish to around 4 feet at
11 seconds. Winds will start to become more southerly, but remain
light. Saturday the southerly winds will start to increase, but
only to around 15 kt. Southerly winds of 10 to 15 kt are expected
to continue through Sunday. Also on Saturday a long period swell
starts to move into the waters. Current models are showing it
around 5 feet at 16 seconds on Saturday afternoon. This will
increase the sneaker wave threat and a beach hazard statement may
be needed.

Monday high pressure briefly returns and brings some light
northerly winds to the area. Tuesday through Friday a fairly
significant pattern shift is starting to look more likely. This
should bring southerly winds and rain to the waters. There is good
general agreement on southerly winds through much of this period,
but the timing is all over the place on when the strongest winds
will be. It looks like there may be at least a short period of
southerly gales. Mkk

Fire weather Weak low pressure is forecast to develop offshore
from northwestern ca during the next couple of days. This feature
will favor modest east winds, with nocturnal gusts at ridgetop
level ranging from 10-15 mph. These winds combined with min rh
values from 20-30 percent, followed by poor to moderate overnight
recoveries, will yield locally elevated fire weather
conditions through the weekend... Particularly during Saturday
night.

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... Small craft advisory until
10 am pst this morning for pzz470.

Small craft advisory until 4 am pst early this morning for
pzz475.

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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 mi49 min 53°F8 ft
HBYC1 - 9418767 - North Spit, CA 21 mi73 min SW 4.1 G 4.1 52°F 50°F1018.1 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 32 mi29 min Calm G 3.9 54°F 55°F1018 hPa47°F
CECC1 - 9419750 - Crescent City, CA 48 mi37 min SW 1 G 1.9 52°F 51°F1017.1 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 mi56 minW 34.00 miFair with Haze56°F43°F62%1018.1 hPa

Wind History from ACV (wind in knots)
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Last 24hrW3NW4W3NW4NW4CalmCalmE4E3CalmE3E4CalmE5E4E5E3CalmE3E4CalmCalmCalmW3
1 day agoNW4NW5NW5NW4CalmS4CalmE3CalmCalmCalmNE3E3E3CalmE3E4NE4CalmE3E3CalmSW3NW5
2 days agoS4W6CalmCalmCalmCalmN5NE4NE3CalmE6CalmE4E3E4CalmCalmE3CalmE3E5CalmCalmN6

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Fri -- 12:05 AM PST     Moonset
Fri -- 06:52 AM PST     5.64 feet High Tide
Fri -- 07:05 AM PST     Sunrise
Fri -- 12:51 PM PST     3.24 feet Low Tide
Fri -- 01:59 PM PST     Moonrise
Fri -- 04:56 PM PST     Sunset
Fri -- 06:06 PM PST     4.88 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.62.33.24.255.55.65.44.94.33.73.33.23.43.84.34.74.94.74.33.62.82

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Fri -- 12:05 AM PST     Moonset
Fri -- 12:50 AM PST     1.07 feet Low Tide
Fri -- 07:04 AM PST     Sunrise
Fri -- 08:00 AM PST     5.75 feet High Tide
Fri -- 01:42 PM PST     3.27 feet Low Tide
Fri -- 01:59 PM PST     Moonrise
Fri -- 04:57 PM PST     Sunset
Fri -- 07:03 PM PST     5.14 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.11.42.13.14.155.55.75.65.14.43.83.43.33.544.555.154.53.72.8

Weather Map and Satellite Images
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wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Eureka, CA (14,3,4,5)
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Ground Weather Radar Station Eureka, CA
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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.