Friday, November17, 2017 L-36.com


Marine Weather and Tides
Weaverville, 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 6:58AMSunset 4:51PM Friday November 17, 2017 4:52 PM PST (00:52 UTC) Moonrise 6:03AMMoonset 4:54PM Illumination 1% Phase: Waning Crescent; Moon at 29 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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This is a Weather Statement Zone, please check the Date to see if it has expired
PZZ410 754 Am Pdt Thu Sep 7 2017
.a strong Thunderstorm over the waters... The areas affected include... Coastal waters from pt. St. George to cape mendocino ca out to 50... At 751 am pdt...doppler radar indicated Thunderstorms... Capable of producing local winds to around 30 knots and small hail. These storms are moving to the northwest at 25 knots. These Thunderstorms will continue through at least mid morning. Precautionary/preparedness actions... 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 4174 12417 4160 12410 4114 12416 4104 12412 4077 12423 4076 12423 4081 12418 4081 12417 4069 12422 4071 12426 4065 12431 4063 12428 4062 12426 4061 12433 4045 12441 4052 12578 4178 12499 4178 12426
PZZ400 218 Pm Pst Fri Nov 17 2017
Synopsis for northern california waters..Marine conditions will continue to improve through tonight as a decaying swell becomes the dominate wave group, with generally low seas lingering through the weekend. Winds will remain light to moderate and from the north through Saturday, and then shift to the south by Saturday night. The next storm system is expected to bring near gale to gale force winds and steepening seas Sunday night into Monday.

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 172206
afdeka
area forecast discussion
national weather service eureka ca
206 pm pst Fri nov 17 2017

Synopsis A colder and drier air mass will develop over the
region tonight through Saturday as high pressure builds across the
area. A front will approach during the late weekend into early
next week, and will aid in moderate rain and strong winds Sunday
night and Monday. Wet and unsettled weather will likely continue
through the middle of next week.

Discussion Friday afternoon satellite imagery showed an upper
trough moving east across the northern rockies, and a ridge
building over the west coast. Surface high pressure was
strengthening in between these two features, and was aiding in dry
stable conditions over nwrn ca. This regime is expected to favor
relatively cold over night lows. Thus, frost advisories have been
maintained for much of the immediate coast, and freeze warnings
for the interior.

A pattern change is forecast to take place late this weekend into
early next week as an upper ridge gradually amplifies over the
wrn CONUS and a positive tilt longwave trough becomes positioned
from roughly the gulf of alaska southwest toward hawaii. As this
occurs, model guidance shows an anonymously moist tropical airmass
becoming entrained within the warm conveyor belt of the trough,
with this airmass subsequently spreading northeastward toward the
west coast of the united states.

This large-scale evolution could potentially favor one or more
heavy rain events during the next week... Though uncertainty in
timing and magnitude is large due to mesoscale variability. At
this time, model guidance is in general agreement with the first
round of rain occurring over northwest ca during Sunday night-
Monday, with a second wave of rainfall occurring Tuesday. Strong
wind gusts, particularly across exposed ridges, will also be
possible with each rain event.

Aviation A weather system, over the last couple of days, moved
through the region overnight morning. Post trough passage: cold
and dry air under a building dome of high pressure filtered into
northwest california basically bringing mostlyVFR and clear skies
to the region... And to most airport airfield sites. However,
several inland valleys developed patchy and shallow fog... Enough
to drop uki into ifr this morning. Tonight tomorrow: during the
afternoon 24 hour TAF period, the main weather issue at the coast
will the possibility of frost, which will inhibit fog development.

Therefore, expect acv & cec airports to remainVFR, although
pockets of mifg may form near the coast. Inland areas will
maintainVFR conditions except across some local river valleys in
the morning. Ta

Marine Northerly winds and subsiding seas will be observed
tonight into Saturday due to the development of surface high
pressure offshore of ca. Marine conditions are forecast to become
more hazardous late Sunday into Monday as a storm system brings
increasing southerly winds to the region... With gales possible
over the northern coastal waters. Steep seas will develop due to
the strengthening winds, and then fluctuate through the work week
as additional storm systems move across the forecast area.

Eka watches warnings advisories
Ca... Frost advisory from 3 am to 8 am pst Saturday for caz102>106-109-
112-113.

Freeze warning from 3 am to 8 am pst Saturday for caz102-104>106-
112-113.

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 81 mi52 min 55°F6 ft

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Wind History from O54 (wind in knots)
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Last 24hrW6W7SW9S5SW5S5SW7CalmNE3NE3NE3N4CalmCalmCalmW3SW5SW7
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1 day agoW6NW3SW3S7SW5N3NE3CalmN3NE3CalmCalmCalmCalmCalmCalmS8SW7W7
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2 days agoSW3W5SW5CalmNE3CalmNE3CalmCalmCalmCalmCalmCalmCalmCalmSW4W7CalmSW3SW7
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Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Fri -- 05:12 AM PST     2.23 feet Low Tide
Fri -- 06:08 AM PST     Moonrise
Fri -- 07:06 AM PST     Sunrise
Fri -- 11:18 AM PST     7.47 feet High Tide
Fri -- 04:56 PM PST     Sunset
Fri -- 04:59 PM PST     Moonset
Fri -- 06:06 PM PST     -0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.85.44.63.62.72.22.53.34.55.86.97.47.36.453.31.60.4-0.20.21.12.53.95.1

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Fri -- 04:53 AM PST     2.28 feet Low Tide
Fri -- 06:08 AM PST     Moonrise
Fri -- 07:06 AM PST     Sunrise
Fri -- 11:13 AM PST     8.26 feet High Tide
Fri -- 04:56 PM PST     Sunset
Fri -- 04:59 PM PST     Moonset
Fri -- 05:47 PM PST     -0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.45.84.83.62.62.32.73.85.26.57.78.286.95.23.21.30-0.30.31.534.55.7

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 (19,4,5,8)
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Ground Weather Radar Station Medford, OR
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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.