Friday, January19, 2018 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 7:34AMSunset 5:20PM Friday January 19, 2018 3:28 PM PST (23:28 UTC) Moonrise 9:12AMMoonset 8:02PM Illumination 10% 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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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 245 Pm Pst Fri Jan 19 2018
.small craft advisory in effect through late Saturday night...
.gale watch in effect from late Saturday night through Sunday afternoon...
Tonight..S winds 5 to 10 kt. Waves sw 2 ft at 5 seconds...and W 15 ft at 14 seconds. Scattered showers.
Sat..S winds 5 to 10 kt. Waves W 14 ft at 14 seconds. Isolated showers.
Sat night..S winds 10 to 15 kt...rising to 20 to 25 kt with gusts to around 40 kt. Waves W 11 ft at 13 seconds. Chance of rain.
Sun..S winds 20 to 25 kt. Waves sw 8 ft at 9 seconds...and W 14 ft at 16 seconds.
Sun night..S winds 5 to 10 kt. Waves W 14 ft at 15 seconds.
Mon..SE winds 5 kt. Waves W 12 ft at 14 seconds.
Tue..S winds 10 to 20 kt. Waves S 6 ft at 7 seconds...and W 8 ft at 14 seconds.
Wed..SW winds 10 to 15 kt. Waves S 3 ft at 5 seconds...and W 11 ft at 13 seconds.
PZZ400 245 Pm Pst Fri Jan 19 2018
Synopsis for northern california waters..Long period westerly swell will continue to propagate through the waters through Sat, but heights will gradually subside. Large and chaotic seas are expected on Sun due to a combination of strong southerly winds and building westerly swell. Seas will slowly settle down on Mon as winds decrease. A new front will bring another threat for gale force southerly winds on Tue.

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 191212
afdeka
area forecast discussion
national weather service eureka ca
412 am pst Fri jan 19 2018

Synopsis Showers will persist across the region through
Friday. These showers combined with cold air aloft will yield
mountain snow and possibly coastal hail. A brief period of drier
weather is expected to occur during Saturday, followed by another
round of rain on Sunday.

Discussion A cold upper trough (500 mb temperatures below -30c)
was approaching nwrn ca Friday morning. Increasing ascent and
destabilization occurring with the approaching trough was
yielding widespread shower development (as well as offshore
thunderstorms). These showers are expected to produce several
inches of snow for elevations above 2500 feet, as well as sporadic
instances of accumulating hail across coastal roadways. Showers
are forecast to dissipate tonight into Saturday as midlevel
heights rise and temperatures warm aloft. However, this period of
dry weather will be short-lived as another trough enters the
region Saturday night and Sunday.

A zone of augmented wswly moisture flux will subsequently impact
the coast of nwrn ca south of the previously mentioned trough. A
robust zone of precipitation will occur as a result, with highest
precipitation rates occurring along wsw facing terrain. In
addition, a subfreezing airmass will be in place over ERN del
norte and humboldt counties, and much of trinity county. Thus,
accumulating snow appears probable for elevations above ~3000
feet. Snowfall totals may be headline worthy along highway 3 from
roughly trinity center to scott mountain summit, as well as
portions of highway 36 in southern trinity county.

Beyond Sunday, an active wet pattern is anticipated as another
frontal system moves across the region Monday night Tuesday,
followed by a second disturbance on Wednesday. By the end of the
forecast period (day 7 day 8), model guidance hints at a long wave
pattern that may support the development of an atmospheric river
tapping into subtropical moisture. However, the details with that
evolution are far from certain.

Aviation Scattered convective showers will continue to impact
most terminals through the next 24 hours, particularly at coastal
terminals like cec and acv. Brief periods of heavy rain and low
ceilings will likely result in periodic reductions to MVFR
categories, with prevailingVFR conditions expected otherwise.

Occasional bouts of ifr visibilities and ceilings will be
possible for very brief periods in the vicinity of the strongest
showers, as will brief periods of small hail and minor
accumulations on runways. Showers will be less frequent at uki,
but periodic MVFR ceilings and occasional scattered ifr low clouds
will be possible here as well. Brc

Marine Westerly swell continues to dominate the waters early
this morning, although wave heights have largely dropped to 16 to
18 feet, 15 seconds at all local buoys. Meanwhile, moderate
westerly breezes continue to blow generally in the same direction
as the swell, perhaps with a few wind gusts to 25 or 30 kt in the
vicinity of stronger convective showers. This will more or less
continue through Saturday, although winds will gradually veer to
the northwest early Saturday. As a result, wave heights will very
slowly decrease in height through early Saturday, then decrease
more noticeably late Saturday as winds weaken to around 5 or 10
kt. Still, wave heights are not expected to drop below 10 feet at
any point over the weekend. Hazardous seas warnings will continue
through Saturday morning for now, although this may be downgraded
to a small craft advisory a little bit ahead of schedule if wave
heights continue to fall at their current rate.

On Sunday, an approaching cold front will bring another round of
strong southerly winds, perhaps reaching gale force across the
outer waters. At the same time, a reinforcing surge of westerly
swell will arrive, resulting in a chaotic and hazardous sea state
that will last through at least early Monday morning. Decreasing
winds will allow seas to settle through early Tuesday, but this
active pattern will continue with another cold front later
Tuesday. Brc

High surf While westerly swell continues to result in large
breakers along area beaches, breaking wave heights continue to
steadily fall. The high surf advisory will be allowed to expire at
11 am today, but beachgoers are urged to continue to exercise
caution as breaking waves will remain relatively large through early
Saturday. Brc

Eka watches warnings advisories
Ca... High surf advisory until 11 am pst this morning for caz101-103-
104-109.

Winter weather advisory until 7 pm pst this evening for caz102-
105>108.

Northwest california coastal waters... Hazardous seas warning
until 10 am pst Saturday for pzz450-455- 470-475.

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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 mi59 min 54°F14 ft
HBYC1 - 9418767 - North Spit, CA 21 mi53 min S 6 G 7 47°F 54°F1020.8 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 32 mi39 min S 7.8 G 9.7 49°F 54°F17 ft1019.9 hPa (-0.4)40°F
CECC1 - 9419750 - Crescent City, CA 48 mi47 min 52°F1019.5 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 mi36 minSW 510.00 miMostly Cloudy52°F41°F66%1020.7 hPa

Wind History from ACV (wind in knots)
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Last 24hrSE9S10SE7S7SE5SE7SE3S7SE5SE5S5S6SE6SE8SE7SE7SE7E6SE8SE76NE4SW4SW5
1 day agoSW8S15SE13
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SW11S11S12S8S8SE6SE10SE7SE5SE6SE6S8S63SW12SE6
2 days agoCalmCalmCalmE3CalmCalmE6SE3CalmE5E5E5E3E4E5E5E5SE6SE3SE8SE11
G17
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Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Fri -- 01:31 AM PST     6.00 feet High Tide
Fri -- 06:44 AM PST     3.18 feet Low Tide
Fri -- 07:37 AM PST     Sunrise
Fri -- 09:11 AM PST     Moonrise
Fri -- 12:27 PM PST     6.84 feet High Tide
Fri -- 05:17 PM PST     Sunset
Fri -- 07:22 PM PST     -0.01 feet Low Tide
Fri -- 08:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.35.95.95.44.73.93.33.23.64.45.36.26.86.76.14.93.41.80.600.10.92.13.6

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Fri -- 02:23 AM PST     6.65 feet High Tide
Fri -- 07:21 AM PST     3.38 feet Low Tide
Fri -- 07:36 AM PST     Sunrise
Fri -- 09:11 AM PST     Moonrise
Fri -- 01:18 PM PST     7.87 feet High Tide
Fri -- 05:18 PM PST     Sunset
Fri -- 08:01 PM PST     -0.19 feet Low Tide
Fri -- 08:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.966.66.55.84.943.43.54.25.36.57.47.87.76.85.23.31.60.3-0.20.21.32.8

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 (18,4,5,8)
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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.