Thursday, February22, 2018 L-36.com


Marine Weather and Tides
Shelter Cove, 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 6:57AMSunset 6:02PM Thursday February 22, 2018 6:31 PM PST (02:31 UTC) Moonrise 11:00AMMoonset 12:10AM 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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PZZ455 Cape Mendocino To Pt Arena Out 10 Nm- 335 Pm Pst Thu Feb 22 2018
.hazardous seas warning in effect until midnight pst tonight...
.small craft advisory in effect through Friday afternoon...
Tonight..N winds 20 to 25 kt with gusts to around 40 kt. Waves N 10 ft at 10 seconds...and nw 5 ft at 15 seconds.
Fri..N winds 15 to 20 kt with gusts to around 30 kt. Waves N 9 ft at 9 seconds...and nw 5 ft at 14 seconds.
Fri night..N winds 10 to 20 kt. Gusts up to 30 kt. Waves N 9 ft at 9 seconds...and nw 5 ft at 13 seconds.
Sat..NW winds 5 to 15 kt. Waves nw 6 ft at 6 seconds...and nw 5 ft at 12 seconds.
Sat night..NW winds 15 kt. Waves nw 6 ft at 7 seconds...and nw 6 ft at 12 seconds.
Sun..NW winds 5 to 15 kt. Waves nw 5 ft at 7 seconds...and nw 8 ft at 13 seconds.
Mon..NW winds 15 to 25 kt. Waves nw 12 ft at 13 seconds.
Tue..NW winds 15 to 25 kt. Waves N 8 ft at 9 seconds...and nw 9 ft at 14 seconds.
PZZ400 335 Pm Pst Thu Feb 22 2018
Synopsis for northern california waters..Northerly gales will bring large, steep seas to the coastal waters today. Gales and steep seas will gradually subside into the weekend yet a northwesterly swell will continue to impact the northwest california coastal waters over the next several days. The next storm system will bring deteriorating conditions once again early next week.

7 Day Forecast for Marine Location Near Shelter Cove, CA
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location: 40.03, -124.07     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 222232
afdeka
area forecast discussion
national weather service eureka ca
232 pm pst Thu feb 22 2018

Synopsis Light snow showers will taper off this evening, but
very cold temperatures may result in icy roads overnight tonight
and Friday morning. Dry but cold weather is expected Friday, with
another round of weak showers and snow showers is expected early
Saturday. A more substantial system will bring rain and snow on
Monday.

Discussion
Thursday night through Saturday night... Snow showers are
quickly weakening throughout the region this afternoon, leaving
only a few very light showers clinging to some interior hills.

While some of these more persistent showers rooted to the terrain
may result in a quick dusting of snow before the end of the night,
most accumulating snow and the potential for small hail has
ended. However, while roadways are improving, some snow may linger
in shady spots and and high elevations through the night.

Meanwhile, overnight low temperatures are expected to be
exceptionally cold, likely dropping well into the teens and low
20s across the interior, and the mid to upper 20s all the way out
to the beach in some places that are sheltered from gusty
northwest winds. As a result, icy patches are a near certainty
overnight, and a hard freeze warning has been issued for coastal
areas from tonight through Friday morning. And as for those winds,
some exposed coastal areas and ridges can expect to see wind
gusts to around 35 mph through the evening and early overnight
hours as well.

Dry but chilly conditions can be expected Friday as dry air and
a brief period of high pressure moves over the area. Some valley
fog may linger in interior areas as well, which could contribute
to icy road surfaces where it persists.

A weak storm system will move through the pacific northwest and
into the great basin early Saturday, and drag a weak cold front
through northwest california as it does. As a result, another
round of weak showers will impact mostly del norte, humboldt, and
trinity counties early Saturday. While the airmass will be cold
yet again, it will likely not be quite as cold as the most recent
event, and showers will likely not be as strong or numerous. As a
result, while some light and low elevation snow accumulations will
be possible, amounts will likely be less than what we saw today.

Brc

Aviation Northerly gales today will result in a large and
steep sea state through early Friday morning. Afternoon buoy
observations showed extremely steep waves northward of cape
mendocino. We expect steep waves to build across the southern
inner waters too as stronger winds shift southward tonight. As a
result, hazardous seas warnings were added to the inner waters
through tonight. Then as high pressure causes the gradient to
relax, north winds and steep seas will gradually subside through
the weekend. A northwesterly swell, however, will continue to
impact the waters through next week helping to keep seas somewhat
elevated. Once gales expire early Friday morning, any wind gust or
sea hazards look to be marginal but we will have to examine the
potential for perhaps a low-end small craft advisory over the
weekend. The next period for more obvious deterioration in the
marine environment will come in the wake of a storm system early
next week. During this period north winds will ramp up and a large
swell will impact the waters. Expect near gales and combined seas
near 11 to 16 feet potentially on Monday through early Tuesday
morning. Confidence has been increasing with the impacts of this
storm system but please stay tuned for possible timing changes.

Kml

Marine Looking into the extended forecast, longwave models
predict broad troughing across the western united states to
persist through much of next week. This system will harbor a cold,
polar airmass which will generally keep temperatures slightly
below normal. This pattern will also allow embedded upper-level
shortwaves to bring additional opportunities for rain and lower
elevation snow. The first of which will impact on Sunday with the
heavier band of precipitation by late Sunday night as the cold
front passes overhead. Impactful snow accumulations will be
possible as snow levels fall through Sunday night but an
additional concern will be snow showers (possibly low elevation)
impacting those traveling commuting on Monday morning. Confidence
is increasing with this system with another round of wintry
impacts that will potentially make traveling hazardous. Stay tuned
for updates with this system. Shortwave ridging will bring a
brief break from precipitation for most of Tuesday before another
round of wintry weather conditions arrives through the later half
of next week. Both the GFS and ECMWF are hinting at greater
precipitation accumulations and low snow levels but there are
still discrepancies in the timing and positioning of this late-
week storm system. Kml

Eka watches warnings advisories
Ca... Hard freeze warning from 10 pm this evening to 9 am pst Friday
for caz101-103-109.

Winter weather advisory until 4 pm pst this afternoon for caz102-
104>108.

Northwest california coastal waters... Gale warning until midnight pst tonight for pzz470.

Small craft advisory until 3 pm pst Friday for pzz455.

Hazardous seas warning until midnight pst tonight for pzz455.

Small craft advisory until 3 am pst Friday for pzz450.

Hazardous seas warning until midnight pst tonight for pzz450.

Gale warning until 6 am pst Friday for pzz475.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46213 - Cape Mendocino, CA (094) 40 mi39 min 48°F14 ft
HBYC1 - 9418767 - North Spit, CA 52 mi55 min NNW 27 G 29 45°F 48°F1025.5 hPa

Wind History for North Spit, Humboldt Bay, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fortuna Rohnerville Airport, CA36 mi56 minNNW 15 G 2010.00 miMostly Cloudy41°F32°F70%1025.1 hPa

Wind History from FOT (wind in knots)
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Last 24hrNW4N5N5CalmN10N3N4CalmS4SE4E7SE7S3CalmW4CalmCalmCalmNW5NW13
G20
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1 day agoE10E8E9E8E9S5E7CalmS5SE9SE8SE7SE7SE6SE6S3NW4NW7NW8N7NW10NW12N10NW9
2 days agoN3NW3NW4CalmS3SE3SW4S6SE6SE5SE6SE6SE7SE9SE7SE7SE5SE5SE4SE5CalmW4CalmSE6

Tide / Current Tables for Shelter Cove, California
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Shelter Cove
Click for Map
Thu -- 12:10 AM PST     Moonset
Thu -- 03:18 AM PST     6.12 feet High Tide
Thu -- 06:59 AM PST     Sunrise
Thu -- 10:20 AM PST     1.23 feet Low Tide
Thu -- 11:00 AM PST     Moonrise
Thu -- 04:32 PM PST     4.20 feet High Tide
Thu -- 06:00 PM PST     Sunset
Thu -- 09:33 PM PST     2.54 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
455.76.165.44.53.42.41.61.31.31.82.53.23.84.24.23.93.42.92.62.62.9

Tide / Current Tables for Punta Gorda, California Current
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Punta Gorda
Click for Map
Thu -- 12:12 AM PST     Moonset
Thu -- 01:08 AM PST     0.73 knots Max Flood
Thu -- 04:07 AM PST     -0.00 knots Slack
Thu -- 07:01 AM PST     Sunrise
Thu -- 07:21 AM PST     -1.11 knots Max Ebb
Thu -- 11:01 AM PST     Moonrise
Thu -- 11:17 AM PST     0.00 knots Slack
Thu -- 02:08 PM PST     0.74 knots Max Flood
Thu -- 05:29 PM PST     -0.00 knots Slack
Thu -- 06:01 PM PST     Sunset
Thu -- 07:50 PM PST     -0.65 knots Max Ebb
Thu -- 11:00 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.70.60.40-0.4-0.8-1.1-1-0.8-0.4-0.10.30.60.70.70.50.2-0.2-0.5-0.6-0.5-0.2-0

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 (21,6,7,8)
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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.