Saturday, September21, 2019 L-36.com


Marine Weather and Tides
Weaverville, CA

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:54AMSunset 7:10PM Saturday September 21, 2019 3:02 PM PDT (22:02 UTC) Moonrise 10:51PMMoonset 1:11PM Illumination 47% Phase: Third Quarter Moon; Moon at 22 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 1119 Am Pdt Mon Sep 16 2019
.isolated strong Thunderstorms over the coastal waters... The areas affected include... Coastal waters from point saint george to cape mendocino ca out 60 nm... At 1114 am, doppler radar indicated a few strong Thunderstorms, capable of producing wind gusts to around 30 knots, from 5 nm northwest of orick to 45 nm west of patrick's point. These storms are moving southeast at 10 knots. 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 these storms passes. && lat...lon 4174 12416 4145 12406 4123 12411 4114 12416 4105 12415 4106 12414 4102 12411 4070 12426 4071 12426 4058 12435 4083 12572 4096 12565 4178 12460 4178 12426
PZZ400 212 Pm Pdt Sat Sep 21 2019
Synopsis for northern california waters.. Strong northerly breezes and steep waves will continue through this evening. Winds and seas will trend downward Saturday night and Sunday, especially north of cape mendocino, as a trough approaches from the nw. Conditions will start to deteriorate again Sunday night after this trough passes over the area. Strong northerlies will develop over the outer waters Monday through Wednesday.


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 212146
afdeka
area forecast discussion
national weather service eureka ca
246 pm pdt Sat sep 21 2019

Synopsis Clouds will increase tonight with light rain showers
across del norte and northern humboldt counties on Sunday. Warm
and dry conditions will return during the early to middle
portions of next week, with cool and showery weather possible
by late in the week.

Discussion There was less valley cloud cover and fog this
morning. However, there was a patch over humboldt bay and the
adjacent coastal waters that was slow to erode due to the
northerly low-level flow piling moisture into the coastal terrain.

Winds have eased a bit near the coast, and the clouds that linger
are thin and hugging the immediate coast downwind to just offshore
cape mendocino. Expect low clouds to increase over the coastal
waters and adjacent land areas later this evening, along with the
potential for some coastal fog. Some patches of drizzle are also
possible from humboldt bay to CAPE mendocino. High clouds will
thicken and lower after midnight as a weakening frontal system
approaches from the nw.

The bulk of the rainfall with the approaching system will remain
n of the area, and the rains will become more scattered as they
shift s. There may be some weak instability over the N interior
late on Sunday afternoon into Sunday evening, but don't feel there
is much chance of thunder. Due to the progressive nature of this
system and subsidence in the wake of the front, what rains do
occur will rapidly come to an end Sunday evening.

An upper ridge will build over the area early next week, with
warm to hot temperatures returning to the interior. There are
indications that periods of offshore flow will occur early next
week, and this could bring fairly warm temperatures to some
redwood coast areas as well.

Long range models are still in good agreement that a large scale
trough will dig over the W portion of the us late next week. This
will bring cooler temperature and the possibility of more
precipitation. Snow levels are forecast to drop to near 6000 feet
by Friday. Sec

Aviation Vfr conditions will prevail well into the evening across
the area as any stratus and patchy fog which had lingered along the
humboldt coast earlier in the day has mostly dissipated. Breezy
conditions will persist through the afternoon at cec and acv, with
nw winds generally in the 10-15 kt range. Expect patchy stratus and
fog to redevelop along the coast overnight, possibly dropping
coastal terminals into the ifr lifr range through early Sunday
morning. These conditions should improve rather quickly during the
morning as another trough approaches the coast, likely resulting in
MVFR ceilings into early Sunday afternoon. Cb

Marine Strong northerlies will begin to ease up across the
outer waters later this evening as a trough approaches the coast and
helps to relax the surface pressure gradient. This lull will be most
pronounced north of CAPE mendocino, where diminishing winds and
short period seas should allow small craft advisory conditions to
temporarily come to an end tonight into Sunday. Headlines will
remain in place through the weekend for the outer waters south of
the cape, with localized gusty conditions and steeper seas also
impacting the inner waters downwind of CAPE mendocino. Northerlies
will quickly re-intensify Sunday night in the wake of the trough,
with gale watches remaining in place across the outer waters from
Monday through the middle of next week. This prolonged period of
strong northerlies will contribute to treacherous short period seas
building into the 10 to 12 ft range early next week. Will have to
continue to monitor headline potential for the nearshore waters, as
even if the strongest winds remain offshore the steeper seas being
generated will eventually propagate into the nearshore waters and
lead to potentially hazardous conditions in the Monday Tuesday time
frame. Cb

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters...

gale watch from Monday afternoon through late Tuesday night
for pzz470.

Small craft advisory until 9 pm this evening for pzz470.

Gale watch from late Sunday night through late Tuesday night
for pzz475.

Small craft advisory until 5 am Monday for pzz475.

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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 mi87 min 60°F1017.1 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi33 min 61°F6 ft

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Weaverville, CA5 mi68 minW 310.00 miFair75°F39°F27%1017.3 hPa

Link to 5 minute data for KO54

Wind History from O54 (wind in knots)
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Last 24hrSW3W4SW3W3NE3NE3N3CalmN3CalmCalmN3CalmCalmCalmCalmCalmCalmCalmS4W4N4CalmSW4
1 day agoN3CalmCalmNE3NE3N4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS4NW3
2 days agoS7SW8S9
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S6CalmCalmNE3CalmCalmNE3CalmCalmCalmCalmCalmS3CalmCalmCalmS4S4SW4SW7

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Sat -- 12:20 AM PDT     0.86 feet Low Tide
Sat -- 06:53 AM PDT     4.77 feet High Tide
Sat -- 07:02 AM PDT     Sunrise
Sat -- 11:51 AM PDT     3.28 feet Low Tide
Sat -- 02:16 PM PDT     Moonset
Sat -- 05:50 PM PDT     6.51 feet High Tide
Sat -- 07:15 PM PDT     Sunset
Sat -- 07:43 PM PDT     Last Quarter
Sat -- 11:55 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.911.62.53.44.24.64.84.64.23.83.43.33.54.255.86.36.56.25.54.53.32.2

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
Click for Map
Sat -- 06:37 AM PDT     5.09 feet High Tide
Sat -- 07:02 AM PDT     Sunrise
Sat -- 11:09 AM PDT     3.24 feet Low Tide
Sat -- 02:16 PM PDT     Moonset
Sat -- 05:34 PM PDT     6.99 feet High Tide
Sat -- 07:15 PM PDT     Sunset
Sat -- 07:43 PM PDT     Last Quarter
Sat -- 11:56 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.32.13.144.755.14.74.13.63.23.43.94.75.76.46.96.96.45.54.22.81.6

Weather Map
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wmap_P
GEOS 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 (18,4,5,8)
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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.