Wednesday, September22, 2021
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Marine Weather and Tides
Weaverville, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:56AMSunset 7:07PM Wednesday September 22, 2021 5:00 AM PDT (12:00 UTC) Moonrise 7:18PMMoonset 7:35AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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:202103071000;;597834 fzus76 keka 070902 mwseka marine weather statement national weather service eureka ca 102 am pst Sun mar 7 2021 pzz410-415-450-455-470-475-071000- 102 am pst Sun mar 7 2021 a marine weather statement has been issued for the following areas... Coastal waters from cape mendocino to pt. Arena ca out 10 nm... Coastal waters from pt. St. George to cape mendocino ca out 10 nm... Humboldt bay... Humboldt bay bar... Waters from cape mendocino to pt. Arena ca from 10 to 60 nm... Waters from pt. St. George to cape mendocino ca from 10 to 60 nm... At 1259 am pst, doppler radar indicated a line of showers, capable of producing winds to around 30 knots. These showers were located along a line extending from 19 nm west of trinidad head to 34 nm southwest of cape mendocino, moving northeast at 30 knots. Precautionary/preparedness actions... Water spouts are possible along with locally higher waves. Boaters should seek safe harbor immediately until these showers pass. Mariners can expect gusty winds to around 30 knots and locally higher waves. Boaters should seek safe harbor immediately until these storms pass. && lat...lon 4123 12411 4114 12416 4098 12412 4076 12423 4087 12415 4085 12409 4083 12408 4080 12418 4070 12421 4070 12427 4071 12427 4044 12441 4032 12435 4026 12436 4016 12425 3994 12505 4121 12458 4143 12406
PZZ400 314 Am Pdt Wed Sep 22 2021
Synopsis for northern california waters..Northerlies will return over the coastal waters today, ramping up late this afternoon over the outer waters and near headlands. A series of small, mid- period northwesterly swells will continue to roll in this week.


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 212148 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 248 PM PDT Tue Sep 21 2021

SYNOPSIS. Very warm and dry conditions will give way to some modest cooling as winds turn back onshore Wednesday. Inland heat will rebound late week with relatively warm temperatures and quite a bit of sun at the coast as well. No rainfall is forecast through the weekend.

DISCUSSION. As expected, offshore flow has brought very warm temperatures to coastal areas this afternoon. 70s are widespread, with even a few lucky sites near the ocean cracking 80 degrees. Some of the nearby inland valleys like Fortuna and Blue Lake even reached the low 90s in the absence of any marine air, which was at least several degrees warmer than forecast. Interior valleys are still on the rise (and actually cooler than the coast in many spots!), but should reach into the 90s for highs. The ACV profiler clearly depicted offshore flow throughout the lowest few thousand feet overnight, as the thermal trough shifted off the coast. In the wake of that trough, light southerly flow around is turning lightly onshore right along the immediate coast this afternoon, backing temperatures off close to the cold ocean waters. HREF suggests an onshore push of marine air could threaten the coast with some fog or stratus by Wednesday morning. However, past experience with these dry, offshore flow days suggests that the modeling will be a little too fast/aggressive bringing stratus back, and there isn't much sign of it until well offshore. An upper-level trough will pass by on Wednesday, bringing cooler air aloft, but probably just a few higher-level clouds. Additionally, Pacific high pressure building toward the coast with a fresh onshore gradient will allow cooler marine air to filter inland, resulting in highs 5 to 10 degrees lower in the interior, and 10 to 20 degrees cooler at the coast.

That cooling will be short-lived, as a strong upper ridge centered over the eastern Pacific builds back eastward across northern California and the Pacific Northwest Thursday into Friday. Heat will subsequently return to our inland areas, with even some mid to upper 90s around Ukiah and parts of Lake County. While some limited marine layer stratus may return around Wednesday night or early Thursday, otherwise it should be a fairly sunny and warm end to the week. Friday has some potential to be another day in the 70s at the immediate coast, but it appears onshore winds may pick up a little too much, keeping it cooler than today. The weekend will feature continued dry and quiet weather, while the upper ridge 'flattens' and begins to give way to some gradual cooling heading into next week. There continues to be some signs in the ensemble and deterministic guidance of some rain arriving as early as late Monday, or possibly Tuesday. Obviously the details are not going to be clear at this time range, but the pattern favors better chances of wet weather from Cape Mendocino northward. /AAD

AVIATION. Widespread clear skies with VFR conditions prevailed through this period. A rather translucent elevated smoke layer can be seen on visible satellite making its way northward, just about to enter Humboldt county. Not expecting SFC VSBY obscurations from it as it moves in late this afternoon. Model soundings have been looking more dry for the coastal terminals through this period, with afternoon observations showing low RH values under periods of light offshore flow. Southerly flow over the waters will make an attempt at moistening them up as some stratus may form offshore. A shallow fog layer may try to form out there very early tomorrow morning, but an approaching trough should mix things up/deepen any existing layer as the morning progresses. Overall, leaning VFR through this period. Interior terminals will remain VFR through the TAF period.

MARINE. Light southerly winds have developed today across all the waters, with a local southwesterly wind max forming between Humboldt Bay and Cape Mendocino. Northerlies are expected to return early Wednesday morning and increase through Wednesday afternoon and evening, possibly reaching SCY levels Wednesday night across the outer waters and near prominent headlands. Northerlies then may back off late this week and this weekend, with intermittent southerly reversals nearshore. Locally driven northerly seas follow this pattern as well, building Wednesday night and Thursday before weakening late this week and this weekend. Meanwhile, a series of mid- period NW swells are set to reinforce each other through the forecast period, with new energy showing by Wednesday then fading Thursday and Friday. Another swell should fill in this weekend of similar size but a hair more west and a longer interval. Long-range ensembles are hinting at a trough deepening over the NEPAC early next week, possibly sending us a little more NW energy around mid- week next week.

FIRE WEATHER. Following a night of very poor RH recoveries over the ridges, it is another dry afternoon with widespread teens for RH values across the interior, and even some 20s trying to encroach on the coast. Thankfully, winds are quite light and mainly terrain- driven. That will change tomorrow with the passage of an upper-level trough and an onshore push, with generally westerly up-valley winds picking up in the afternoon. Some gusts over 20 mph are possible in the more wind-prone exposed river valleys, but this will not be anything more exceptional than many 'enhanced up-valley wind days' we have seen this summer. This will also be accompanied by cooler temperatures and a modest uptick in humidity, especially with respect to overnight recoveries. That will be short-lived, however, as the flow turns back offshore heading into Thursday. Am headlining locally critical conditions in fire weather zones 264 and 277, as a push of northeast winds clips our region. This will be similar to Monday but with less strong and more localized winds, restricted to the ridges mainly, but mixing down into some spots around Clearlake Thursday afternoon. These winds will ease heading into Thursday night and Friday. Dry weather will continue through the weekend, but with a gradual cooling trend. /AAD

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . None.

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

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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 mi84 min 53°F1020 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi34 min 53°F5 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
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Wed -- 02:03 AM PDT     6.61 feet High Tide
Wed -- 07:04 AM PDT     Sunrise
Wed -- 08:15 AM PDT     0.83 feet Low Tide
Wed -- 08:40 AM PDT     Moonset
Wed -- 02:27 PM PDT     6.80 feet High Tide
Wed -- 07:12 PM PDT     Sunset
Wed -- 08:22 PM PDT     Moonrise
Wed -- 08:42 PM PDT     0.98 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.26.26.66.35.442.61.40.9123.34.866.76.764.83.321.211.62.7

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
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Wed -- 01:47 AM PDT     7.10 feet High Tide
Wed -- 07:04 AM PDT     Sunrise
Wed -- 07:33 AM PDT     0.74 feet Low Tide
Wed -- 08:40 AM PDT     Moonset
Wed -- 02:11 PM PDT     7.30 feet High Tide
Wed -- 07:13 PM PDT     Sunset
Wed -- 08:00 PM PDT     0.90 feet Low Tide
Wed -- 08:22 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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66.97.16.55.13.41.90.90.81.52.84.35.76.87.375.94.32.61.40.91.32.23.5

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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