Saturday, January16, 2021
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Marine Weather and Tides
Weaverville, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
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.

Sunrise 7:28AMSunset 5:10PM Saturday January 16, 2021 12:00 AM PST (08:00 UTC) Moonrise 10:06AMMoonset 9:06PM Illumination 9% 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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PZZ415 Expires:201909161915;;886895 Fzus76 Keka 161819 Mwseka Marine Weather Statement National Weather Service Eureka Ca 1119 Am Pdt Mon Sep 16 2019 Pzz410-415-450-470-161915- 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 833 Pm Pst Fri Jan 15 2021
Synopsis for northern california waters..Locally gusty northerly winds will continue near and south of cape mendocino through tomorrow morning, while lighter northerlies are expected north of the cape. Otherwise, seas will continue to build the rest of this evening in response to a long-period westerly swell. Gale force northerlies will develop over the outer waters Sunday and 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 152300 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 300 PM PST Fri Jan 15 2021

SYNOPSIS. Dry and mild conditions will prevail as high pressure ridging expands through Saturday. Northerly to easterly winds will be on the increase Saturday. Hints of a pattern change showing up mid to late next week.

DISCUSSION. Some trace amounts of light rain was observed this morning in isolated coastal areas along with overcast skies as a weak front passes. Radar continued to show light returns in the early afternoon with very little if any light rain reaching the ground. The upper cloud deck will thin out overnight, but the conditions will be favorable for widespread inland valley fog to develop and linger into the late morning hours. Abundant sunshine will be seen away from the immediate coast on Saturday, while northerly ridgetop winds pickup in the evening and overnight, mainly along Cape Mendocino. Temperatures aloft will gradually warm through Saturday, particularly across the southern half of the area where 850 mb temps of 15-17 degrees Celsius will correspond to afternoon highs in the low to mid 70s in the interior valleys of Mendocino and Lake County this weekend.

A shortwave will clip the area on Sunday and then dig south while rapidly deepening with a synoptic positively tilted Great Basin trough. This feature will quickly strengthen the pressure gradient alongside the NEPAC building ridge. The result will be warm, dry, and locally gusty conditions for NW CA through the first half of next week. Winds may occasionally gust over 50 mph over the ridges at times, especially Sunday night. Right now wind advisory conditions look isolated and brief, but will need to be monitored. The trough will cutoff from the flow later Tuesday as high pressure noses back in, easing the pressure gradient. Refer to the fire weather discussion below for additional details.

There is growing confidence the large dominant Pacific ridge will weaken and begin retrograding west by midweek. This will open the window for a pattern shift toward cooler and wetter weather. There is uncertainty in the available moisture at that time if a trough were to dig down, along with other details to be worked out. /JJW

AVIATION. Multi-layered cloudiness has blanket most of the area today, along with a bit of drizzle or very light rain along the North Coast and some patches of fog. Clouds will continue through the night. There is still the potential of fog and IFR ceilings overnight tonight, but higher level cloudiness may continue to impede better radiational cooling. There may be a bit of shallow ground fog at KUKI toward daybreak as well, but have not gone below prevailing 6SM visibility at this time. Winds will be light. /SEC

MARINE. A series of westerly swells will aid in continuing 10 to 15 foot seas through early next week. Combined seas will build further over the outer waters into the 15 to 25 foot range Sunday evening through Monday afternoon as gale force northerlies develop. After Monday, periods of hazardous marine conditions will persist through mid-week as winds remain gusty out of the north. /Garner&SEC

FIRE WEATHER. A shortwave trough will rapidly deepen as it approaches NW CA Sunday evening and then dig southward along the CA coast Sunday night, with another vigorous shortwave dropping through the Great Basin later Monday helping to reinforce large scale troughing from the intermountain west into southern CA. This synoptic setup has the potential makings of an unseasonably strong offshore wind event from Sunday night into Tuesday across parts of Mendocino and Lake Counties, which is further supported by ensemble standardized wind anomalies of 3-4 standard deviations above normal early next week. Critical fire conditions are not expected to be met given the relatively recent widespread rainfall, which has kept fuel moisture in check. CB/JJW

BEACH HAZARDS. A long period swell is forecast to impact west facing beaches through Monday. That swell will aid in a moderate threat for hazardous surf Saturday and again on Monday, while sneaker waves will be possible on Sunday. /Garner&SEC

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 10 PM PST Saturday for PZZ450-455-470.

Gale Watch from Sunday morning through Monday afternoon for PZZ470-475.

Small Craft Advisory until 10 AM PST Sunday for PZZ475.



Visit us at https://www.weather.gov/eureka

Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka

For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HBYC1 - 9418767 - North Spit, CA 74 mi85 min 53°F
46244 - Humboldt Bay, North Spit, CA 81 mi35 min 53°F12 ft

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

Link to 5 minute data for KO54

Wind History from O54 (wind in knots)
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Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Sat -- 03:27 AM PST     6.12 feet High Tide
Sat -- 07:38 AM PST     Sunrise
Sat -- 08:40 AM PST     2.98 feet Low Tide
Sat -- 10:11 AM PST     Moonrise
Sat -- 02:19 PM PST     6.92 feet High Tide
Sat -- 05:15 PM PST     Sunset
Sat -- 09:11 PM PST     Moonset
Sat -- 09:20 PM PST     -0.35 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.74.35.46.165.54.63.73.133.54.45.56.46.96.86.14.83.21.60.3-0.3-0.20.7

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
Click for Map
Sat -- 03:11 AM PST     6.57 feet High Tide
Sat -- 07:38 AM PST     Sunrise
Sat -- 07:58 AM PST     2.94 feet Low Tide
Sat -- 10:11 AM PST     Moonrise
Sat -- 02:03 PM PST     7.44 feet High Tide
Sat -- 05:15 PM PST     Sunset
Sat -- 08:38 PM PST     -0.45 feet Low Tide
Sat -- 09:11 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.75.16.16.66.35.44.33.32.93.24.15.26.37.17.47.164.42.50.8-0.3-0.40.21.4

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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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 numerous 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.