Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Weaverville, 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 7:23AMSunset 4:44PM Thursday December 13, 2018 11:58 AM PST (19:58 UTC) Moonrise 11:55AMMoonset 10:46PM Illumination 37% Phase: Waxing Crescent; Moon at 6 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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PZZ410 730 pm pdt Tue mar 13 2018 a marine weather statement has been issued for the following areas... Coastal waters from pt. St. George to cape mendocino ca out 10 nm... Humboldt bay bar... At 729 pm pdt, doppler radar indicated a shower, capable of producing winds to around 30 knots. This shower was located 9 nm north of cape mendocino, moving northeast at 20 knots. Precautionary/preparedness actions... Water spouts are possible along with stronger Thunderstorms...locally higher waves...and lightning strikes. Boaters should seek safe harbor immediately until these storms pass. Mariners can expect gusty winds to around 30 knots...locally higher waves...and lightning strikes. Boaters should seek safe harbor immediately until this storm passes. && lat...lon 4080 12411 4080 12418 4075 12419 4073 12423 4070 12421 4068 12422 4070 12427 4071 12427 4065 12431 4063 12429 4063 12424 4062 12426 4063 12432 4047 12439 4057 12459 4095 12437 4086 12417 4076 12423 4085 12416 4082 12409
PZZ400 846 Am Pst Thu Dec 13 2018
Synopsis for northern california waters..A cold front will move across the waters by Friday morning, generating a period of gale force southerly winds. Another bout of strong winds are forecast this weekend as a second storm approaches. A series of westerly swells will spread into the waters today through Monday, resulting in large and hazardous seas.


7 Day Forecast for Marine Location Near Weaverville, CA
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location: 40.78, -122.83     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 131313
afdeka
area forecast discussion
national weather service eureka ca
513 am pst Thu dec 13 2018

Synopsis High pressure will allow for another dry day with
plenty of sunshine across northern california. A cold front will
bring a quick shot of rain, gusty winds, and modest mountain snows
on Friday. Another cold front will pass through on Sunday.

Discussion One more quiet day of weather for northern
california before the pattern turns more active, starting with a
fast-moving cold front set to swing through on Friday. Thin but
fairly widespread high cloudiness has continued to drift eastward
over our region overnight, which has limited fog to the shallow
and patchy variety, but still allowed temperatures to cool some 5
to 10 degrees lower compared to Wednesday morning. The high clouds
will give way to mostly sunny skies today, and with building high
pressure aloft, high temps will end up several degrees warmer than
yesterday. A fair amount of coastal spots and some of the warmer
inland valleys, especially in mendocino, will reach the 60s.

Little has changed with our expectations for Friday's cold front.

Model guidance has come together in good agreement with respect
to the timing of the frontal passage and arrival of heavier rain
and gusty southerly winds. Rain will push onshore along the
redwood coast sometime around 8 am, and last until around midday.

Rain will hold off until late morning in eastern trinity and
mendocino, and last through mid-afternoon or so. A few showers may
linger behind the main band of rain, otherwise expect a rather
abrupt end Friday afternoon and evening. Still looking at
0.50-1.00 inches of rainfall for most, but closer to a third of an
inch in the valleys of mendocino and eastern trinity. Have
hoisted a wind advisory for coastal del norte and the adjacent
higher terrain above 1500 ft in del norte and humboldt. Models
still showing 50 kt of wind in a low-level jet as low as 1000 or
1500 ft above msl. This will translate to 40 to 45 mph gusts
around cec, and 40 to 50 mph gusts over the exposed terrain above
1500 ft. Locally higher winds will occur over mountain ridges.

Winds will ramp up across these areas after midnight tonight,
likely peaking around 7 or 8 am just as the rain is arriving,
then tailing off fairly quickly during the late morning and
afternoon hours. Additionally, a few inches of snow will be
possible over scott mountain summit on highway 3, with the other
major mountain passes below 4500 or 5000 ft just getting wet, as
opposed to white.

Saturday will feature a break between cold fronts, with another
front set to swing through on Sunday. However, some moisture from
Friday's front may get hung up around mendocino county. As warm
advection precedes the next front, some spotty light rain may
result. Most of humboldt and del norte will likely end up dry,
though. Expect a fairly cloudy day though, aside from some breaks
of dim sunshine. The next front on Sunday still looks to carry a
widespread 1-2 inches of rain, as it will have a better connection
to deeper pacific moisture. A deeper upper-level trough will
follow, with showers lingering into Sunday night. The cold air
under this trough does not look to be quite chilly enough for a
small hail threat with those showers. Winds ahead of the front will
be gusty, especially in those same areas as with Friday's front,
but expect them to be below advisory criteria. The focus will be
more on the rain this time, and we may need to monitor the burn
scars of the carr and mendocino complex fires. Expect rain rates
will not be quite heavy enough for debris flow, but it bears
watching.

Model uncertainty remains heading into next week. An atmospheric
river with a better connection to pacific subtropical moisture is
likely to set up, but taking aim at the pacific northwest, to the
north of california. However, there are still questions as to the
southern extent of this moisture, which will determine weather we
have a very wet week, or a relatively dry one. Either way, it
looks relatively mild, with high snow levels. Aad

Aviations Mainly clear skies with just a few high clouds mixed in
are prevailing across the region. The area is in a dry slot ahead
of an approaching storm system expected to impact the CWA later this
evening. MainlyVFR conditions are expected to prevail across all
terminals through the next TAF cycle however gusty southerlies will
develop late this evening ahead of a cold front. Expecting the
strongest surface winds to occur at cec after midnight tonight
ranging from 25 to 35 kts and lasting the the morning hours.

Marine The mid-period large west swell continues to move
across the waters and will fluctuate in heights through the weekend.

A frontal system will move over the coastal waters late tonight
bringing with it gusty southerly winds. Gale warnings are in effect
for the northern waters where winds are expected to peak right
around sunrise on Friday. Winds are forecast to quickly diminish
Friday afternoon, with a switch to westerly expected Friday night.

Another system will move across the area on Sunday, with combined
seas expected to reach around 25 feet. As a result, gusty
southerlies will impact the coastal waters beginning late Saturday
night.

Beach hazards With Friday's cold front, a substantial westerly
swell will result in breaking waves around 20 ft north of cape
mendocino on Friday. A more significant swell is expected late
Sunday into Monday, will build around 20 to 25 feet, which would
result in breaking waves possibly approaching 30 feet. A high
surf advisory or warning will likely be issued as we near that
event. People planning any beach activities should exercise
caution and stay farther back from the surf and off of jetties.

Eka watches warnings advisories
Ca... Wind advisory from midnight tonight to 8 am pst Friday for
caz101.

Wind advisory from midnight tonight to 9 am pst Friday for
caz102-105-106.

Northwest california coastal waters... Small craft advisory until
4 am pst Friday for pzz450.

Gale warning from 1 am to 3 pm pst Friday for pzz450.

Small craft advisory until 9 pm pst this evening for pzz470.

Gale warning from 9 pm this evening to 3 pm pst Friday for
pzz470.

Small craft advisory until 3 pm pst Friday for pzz455-475.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HBYC1 - 9418767 - North Spit, CA 74 mi83 min S 8.9 G 11 51°F 53°F1024.4 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi59 min 56°F15 ft

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Weaverville, CA5 mi84 minN 00.75 miOvercast32°F30°F93%1028.1 hPa

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Last 24hrCalmSW3CalmCalmCalmCalmCalmCalmNE3CalmE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmE3CalmS11
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--W3NE4N3N3NE3CalmCalmCalmCalm
2 days agoW7SW6CalmCalmSW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3SW4SW3

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Thu -- 05:24 AM PST     5.64 feet High Tide
Thu -- 07:32 AM PST     Sunrise
Thu -- 10:37 AM PST     3.61 feet Low Tide
Thu -- 12:00 PM PST     Moonrise
Thu -- 03:48 PM PST     5.72 feet High Tide
Thu -- 04:49 PM PST     Sunset
Thu -- 10:51 PM PST     Moonset
Thu -- 11:03 PM PST     0.68 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.12.23.44.55.25.65.65.24.64.13.73.644.55.25.65.75.44.83.92.81.810.7

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
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Thu -- 05:08 AM PST     6.04 feet High Tide
Thu -- 07:32 AM PST     Sunrise
Thu -- 09:55 AM PST     3.58 feet Low Tide
Thu -- 12:00 PM PST     Moonrise
Thu -- 03:32 PM PST     6.13 feet High Tide
Thu -- 04:49 PM PST     Sunset
Thu -- 10:21 PM PST     0.59 feet Low Tide
Thu -- 10:51 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.72.94.15.15.865.85.24.43.83.63.84.45.15.76.16.15.64.73.52.31.20.60.7

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 (14,3,4,5)
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Ground Weather Radar Station Medford, OR
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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.