Thursday, June21, 2018 L-36.com


Marine Weather and Tides
Westhaven-Moonstone, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:42AMSunset 8:53PM Wednesday June 20, 2018 9:57 PM PDT (04:57 UTC) Moonrise 12:37PMMoonset 12:36AM Illumination 53% Phase: First Quarter Moon; Moon at 8 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- 806 Pm Pdt Wed Jun 20 2018
Tonight..N winds 5 kt. Waves nw 3 ft at 4 seconds...and W 3 ft at 11 seconds. Patchy fog.
Thu..N winds 5 to 10 kt. Waves nw 3 ft at 4 seconds...and W 3 ft at 11 seconds. Patchy fog.
Thu night..N winds 5 to 15 kt. Waves nw 4 ft at 5 seconds... And W 2 ft at 10 seconds. Patchy fog.
Fri..N winds 10 to 20 kt. Waves nw 5 ft at 7 seconds...and N 2 ft at 11 seconds.
Fri night..N winds 10 to 20 kt. Waves nw 7 ft at 8 seconds.
Sat..N winds 10 to 20 kt. Waves nw 9 ft at 9 seconds.
Sun..NW winds 5 to 15 kt. Waves nw 7 ft at 7 seconds.
Mon..NW winds 10 to 20 kt. Waves nw 7 ft at 8 seconds...and nw 3 ft at 12 seconds.
PZZ400 806 Pm Pdt Wed Jun 20 2018
Synopsis for northern california waters..North winds will increase through the end of the week as high pressure strengthens offshore. Gale force winds and steep hazardous seas are likely Friday through Monday.

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 202109
afdeka
area forecast discussion
national weather service eureka ca
209 pm pdt Wed jun 20 2018

Synopsis A warm up is expected for the interior late this week
into the weekend. Northerly breezes and marine air will keep coastal
areas seasonably cool. Also, a brief thunderstorm will be
possible through early this evening in far northeast trinity
county.

Discussion Cumulus clouds have been sprouting up with daytime
heating over the interior mountains once again today. Any storms
that fire up with limited moisture and CAPE over NE trinity county
will likely move off very quickly into siskiyou county. Strong
southwesterly flow aloft is typically not favorable for storms
across NW california mountains unless there is much more
instability and or larger scale forcing. The pva MAX that has been
tracking across the area this afternoon may provide some larger
scale ascent, however this vort MAX has been moving rapidly
northeast and will be out of our forecast during peak heating.

Confidence we are going to receive isolated strikes remains low,
but will continue to mention a slight chance of storms around the
horn for early this evening.

Stratus remained firmly entrenched over coastal areas today
due to strengthening onshore flow associated with the passage of
a mid level shortwave trough. The trend over the next couple of
days will be for a gradual decrease in stratus as northerlies ramp
up offshore and temperatures aloft warm up each day. The stronger
adiabatic compressional heating should eventually smash down the
marine layer for longer lasting clearing. An offshore flow
pattern will start to emerge Friday night which should limit the
stratus coverage. Typically the marine air pools north of cape
mendocino and spreads back toward the del norte county coast
during the night time hours. Thus will not be overly optimistic
with absolutely no stratus clouds for the north coast. Overall,
it does look sunnier for coastal areas this weekend. The
mendocino coast will fair better with limited stratus coverage
over the weekend. The GFS continues to hint at a wind reversal on
Sunday. If this wind reversal develops stratus will return to the
mendocino coast as early as Sunday. It is still outside the range
of the high resolution models, so confidence remains low that
stratus will return to mendocino county shores on Sunday.

By far, the main concern Friday through Sunday will be the
interior heat, as an upper level ridge builds over the area. The
strong adiabatic compressional heating should propel daytime highs
well into the 90s with some sites reaching 100f or more.

Initially the brisk northerlies may keep temperatures from getting
too toasty on Friday. On Saturday and Sunday, models indicate
better offshore wind flow. This should cut off the marine air and
allow high temperatures to warm well into the 90s to around 100.

While these temperatures are not particularly out of the ordinary
for our interior areas this time of year, a moderate risk of
adverse health effects will be possible for those sensitive to
heat this weekend.

The model data shows falling 500mb heights and a transient mid
level trough approaching the west coast early next week. The
gfs is most aggressive with this trough and most likely
incorrect. A modest cooling trend will most likely begin Monday
and may last through the mid week, although temperatures will
remain quite warm for interior locales. We are heading into late
june and expect diurnal coastal stratus each day.

Aviation Deepened and persistent marine stratus appeared quite
fortified through much of the day along the north coast. The
deepening of the marine layer is attributed to a passing upper
level disturbance swinging through the region. CIGS vs vis had
more of an impact at cec, acv and other near coastal airfields
today, although impact seemed somewhat minimal to flight
operations. In agreement with previous discussion that stratus
will remain mostly locked along the coast. However, early
afternoon vis Sat picture showed a few pockets of binovc which may
allow brief scattering through afternoon. Uki remainedVFR even
as a light south flow brought some clouds to the mendocino sonoma
border. Convection over the trinity alps may pose a few bumps for
locale aviation, butVFR will continue. Ta

Marine (issued at 400 am pdt Wed jun 20 2018) Latest ascat
pass this morning shows light northerly winds in place across the
southern waters with very light to calm winds across the northern
waters. Surface high pressure will continue to build across the
area today which will cause northerly winds to continue to
gradually strengthen. Seas on the other hand, will continue to
gradually subside for the next few days as a westerly and
northerly swell continue to decay.

Winds will begin to strengthen by Thu evening south of cape
mendocino and across all of the waters by Friday. Gale force
conditions are possible across the waters by Saturday, leading to
steep and hazardous seas. Strong winds and steep seas will persist
through at least the middle of next week. Wci

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... None.

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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 mi58 min 54°F3 ft
HBYC1 - 9418767 - North Spit, CA 21 mi82 min N 5.1 G 6 53°F 52°F1019.8 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 32 mi48 min NNE 5.8 G 7.8 55°F 53°F1019.6 hPa52°F
CECC1 - 9419750 - Crescent City, CA 48 mi58 min E 2.9 G 2.9 55°F 50°F1019.2 hPa (+0.6)

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 mi65 minN 710.00 miOvercast56°F52°F87%1019.5 hPa

Wind History from ACV (wind in knots)
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Last 24hrS3S4SE3CalmCalmCalmCalmCalmCalmE3CalmCalmW3NW6W8W7NW8NW8NW8NW8NW9
G20
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1 day agoCalmCalmCalmCalmNE4CalmN4NW3N4NE3W5NW4NW5W6NW6W5NW8NW10NW9NW9NW7NW7--W5
2 days agoS53S3S4S3SW5CalmCalmW4W3SW3W7W4CalmW5W5NW7NW95W3W6NW7NW6W4

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
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Thu -- 01:16 AM PDT     1.62 feet Low Tide
Thu -- 02:06 AM PDT     Moonset
Thu -- 05:44 AM PDT     Sunrise
Thu -- 06:57 AM PDT     4.79 feet High Tide
Thu -- 01:01 PM PDT     0.90 feet Low Tide
Thu -- 02:41 PM PDT     Moonrise
Thu -- 07:45 PM PDT     6.43 feet High Tide
Thu -- 08:52 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.61.82.33.144.64.84.53.82.91.91.20.91.223.14.45.56.36.4653.8

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Thu -- 01:49 AM PDT     1.86 feet Low Tide
Thu -- 02:06 AM PDT     Moonset
Thu -- 05:45 AM PDT     Sunrise
Thu -- 07:42 AM PDT     5.60 feet High Tide
Thu -- 01:37 PM PDT     0.87 feet Low Tide
Thu -- 02:41 PM PDT     Moonrise
Thu -- 08:36 PM PDT     7.45 feet High Tide
Thu -- 08:51 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
32.11.92.233.94.85.45.65.14.12.91.810.91.52.63.95.46.67.37.46.85.6

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 (0,6,7,8)
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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.