Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Westhaven-Moonstone, CA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:19AMSunset 8:08PM Wednesday April 25, 2018 1:31 AM PDT (08:31 UTC) Moonrise 2:40PMMoonset 3:23AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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- 851 Pm Pdt Tue Apr 24 2018
Tonight..SW winds 5 to 10 kt. Waves S 2 ft at 4 seconds...and W 8 ft at 15 seconds. Patchy fog.
Wed..SW winds 5 to 10 kt. Waves S 2 ft at 4 seconds...and W 6 ft at 14 seconds. Patchy fog.
Wed night..S winds 5 to 10 kt. Waves sw 2 ft at 5 seconds... And W 5 ft at 13 seconds. Patchy fog.
Thu..SW winds 5 kt. Waves nw 5 ft at 12 seconds.
Thu night..SW winds 5 kt. Waves nw 5 ft at 13 seconds.
Fri..S winds 5 kt. Waves nw 6 ft at 15 seconds.
Sat..SW winds 5 kt. Waves W 6 ft at 14 seconds.
Sun..NW winds 10 to 20 kt. Waves nw 6 ft at 7 seconds...and nw 6 ft at 13 seconds.
PZZ400 851 Pm Pdt Tue Apr 24 2018
Synopsis for northern california waters..Light to moderate winds will persist through Saturday as weak low pressure offshore slowly moves toward the coast. Seas will remain dominated by westerly swell and long period southwest swell through Saturday. Northerly winds and steep seas will build 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 242138
afdeka
area forecast discussion
national weather service eureka ca
238 pm pdt Tue apr 24 2018

Synopsis High pressure will maintain mainly sunny skies and
above normal temperatures through Thursday across interior
northwest california, while onshore flow brings cooler weather and
increasing marine stratus to coastal areas. An upper-level low
will likely bring cooler weather and showers Friday into the
weekend.

Discussion The marine layer has expanded while fog and a well
defined stratus deck move north along the mendo coast this morning
reaching CAPE mendocino and gradually making the turn toward
humboldt bay. Expect the low clouds and fog to invade the north
coast tonight bringing an end to the warm afternoons and clear
nights along the near coast. The marine layer will continue to
deepen as onshore flow increases Wednesday, with fairly persistent
clouds and limited afternoon sunshine through Thursday along much
of the northwest california coast. Meanwhile, the persistent but
weak upper level ridge is gradually giving way to an approaching
offshore upper- level low. Inland temperatures will remain above
normal through Thursday; warmest today, then gradually dropping
each day this week. The upper-level low will begin to push onshore
on Friday, with inland high temperatures dropping into the 50s
and low 60s Friday through Sunday, and a good chance of showers
for the bulk of our region. There will continue to be a bit of
model disagreement on the track and depth of the upper-low; for
now favor a blend of the ECMWF and GFS ensemble mean. The
operational GFS and maybe half of the GFS ensemble members have a
weaker and farther north system which would be a drier solution,
especially south of CAPE mendocino. In either case, do not expect
significant rainfall amounts, but something in the tenth to half-
inch range Friday through Sunday. The potential for some
thunderstorms over interior areas would be the more hazardous
threat, but instability numbers are not super impressive and
plenty of cloud cover may inhibit cell growth... Thus will keep
a minimum threat of thunderstorms in the forecast. The general
consensus of model solutions heading into next week advertise an
upper-level ridge building in after the upper-level low passes by,
which would result in warming temperatures and drier weather.

However, the exact timing of that remains uncertain. A secondary
trough or two dropping southeast out of the gulf of alaska may
delay the arrival of that warmer and drier weather early next
week. For now, made little to no change to the forecast Sunday
through next Tuesday. Aad jt

Aviation A ridge of high pressure continued to allow for mostly
vfr weather across the region... And even at the coast north of
cape mendocino through mid-morning. However, the mendocino coast
was blanketed by marine clouds early on as a stratus surge moved
northward. Shortly before 12 noon, stratus clouds had blown into
acv's airport and nearly an hour later into cec's airport. Cigs
and vis rapidly dropped into ifr. Ifr conditions will probably be
tempo along some areas through afternoon before totally becoming
settled over the coastal terminals this evening. Clouds may spread
into local coastal valleys and over nearby hills. Interior
mountain areas will generally remainVFR through Wednesday even
though model guidance is suggesting some lower clouds spreading
into uki in the morning. Right now, uncertainty! Ta

Marine A southerly surge has resulted in gusty winds from 20 to
25 kt today, primarily around CAPE mendo. These gusty southerlies
should die down quickly this evening. Wind fields overall will
remain light (15kt or less) to borderline moderate (20kt), wed
through Sat as a weak surface low offshore maintains diffuse
pressure gradients over NW california waters. It will take til late
Sunday or more likely Monday before northerly winds ramp up to
formidable levels (25kt or more) after the passage of an upper level
trough.

Seas should remain dominated by mid period westerly swell and long
period s-sw swell through much of the forecast period. Any short
period wave generation will remain small (around 2ft or less) until
sun and Mon when northerly wind waves build to significant levels.

Short period seas should reach 10 ft or greater on mon.

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 mi31 min 53°F7 ft
HBYC1 - 9418767 - North Spit, CA 21 mi55 min WSW 1.9 G 1.9 51°F 52°F1017.7 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 32 mi41 min S 7.8 G 12 50°F 52°F8 ft1017 hPa (+0.3)48°F
CECC1 - 9419750 - Crescent City, CA 48 mi49 min S 5.1 G 7 51°F 55°F1017.5 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 mi38 minN 05.00 miFog/Mist53°F48°F86%1017.6 hPa

Wind History from ACV (wind in knots)
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Last 24hrE3E3CalmCalmCalmCalmE3CalmW5W5W5W5W4W6W5W4SW5SW5SW4CalmCalmNW5CalmCalm
1 day agoCalmE3CalmCalmE3E3CalmCalmNW43Calm3W6SW5SW6SW6CalmSW3CalmE3CalmS3SE4E4
2 days agoSE4E4E5E3CalmE4E3E345W6NW17
G23
N14NW19NW20NW12NW13NW9NW7SE3S3S7SE5SE4

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
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Wed -- 02:52 AM PDT     1.97 feet Low Tide
Wed -- 04:23 AM PDT     Moonset
Wed -- 06:22 AM PDT     Sunrise
Wed -- 08:39 AM PDT     5.56 feet High Tide
Wed -- 03:12 PM PDT     0.04 feet Low Tide
Wed -- 03:40 PM PDT     Moonrise
Wed -- 08:07 PM PDT     Sunset
Wed -- 09:47 PM PDT     6.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.72.82.222.3344.95.45.554.12.81.50.500.21.12.33.755.865.6

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Wed -- 03:24 AM PDT     2.18 feet Low Tide
Wed -- 04:23 AM PDT     Moonset
Wed -- 06:22 AM PDT     Sunrise
Wed -- 09:26 AM PDT     6.53 feet High Tide
Wed -- 03:40 PM PDT     Moonrise
Wed -- 03:47 PM PDT     -0.01 feet Low Tide
Wed -- 08:07 PM PDT     Sunset
Wed -- 10:38 PM PDT     6.88 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.142.92.22.32.93.84.95.96.56.45.74.42.81.30.300.51.63.14.65.96.76.8

Weather Map and Satellite Images
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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 (4,6,7,8)
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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.