Friday, August14, 2020
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Marine Weather and Tides
Big Lagoon, CA

Version 3.4
NOTICE
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 6:24AMSunset 8:17PM Friday August 14, 2020 7:17 AM PDT (14:17 UTC) Moonrise 12:45AMMoonset 4:12PM Illumination 19% Phase: Waning Crescent; Moon at 25 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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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 250 Am Pdt Fri Aug 14 2020
Today..N winds 5 to 10 kt. Waves nw 5 ft at 8 seconds. Patchy smoke. Haze.
Tonight..N winds 5 to 10 kt. Waves nw 5 ft at 8 seconds.
Sat..W winds 5 to 10 kt. Waves nw 5 ft at 8 seconds.
Sat night..S winds 5 kt. Waves nw 4 ft at 8 seconds.
Sun..SW winds 5 kt. Waves nw 4 ft at 11 seconds.
Mon..N winds 5 kt. Waves nw 3 ft at 10 seconds.
Tue..N winds 5 to 10 kt. Waves W 4 ft at 9 seconds...and sw 2 ft at 18 seconds.
PZZ400 250 Am Pdt Fri Aug 14 2020
Synopsis for northern california waters..Gusty northerlies and steep, short-period seas which persisted across the outer waters overnight will slowly improve today, and will continue to diminish heading into the weekend.


7 Day Forecast for Marine Location Near Big Lagoon, CA
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location: 41.17, -124.32     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 141155 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 455 AM PDT Fri Aug 14 2020

SYNOPSIS. Above normal temperatures and excessive afternoon heat are expected across interior areas Friday through the middle of next week, with slightly warmer than normal temperatures along the coast at times as well. Isolated thunderstorms are also possible over the weekend across interior areas.

DISCUSSION. A strong upper ridge centered over the Southwestern U.S. will begin to expand northwest over the forecast area today, resulting in significant warming for the interior as well as the coast. Afternoon temperatures are expected to peak around 105 to 110F degrees in many interior valleys, particularly across interior Mendocino, Lake, and Trinity counties today and Saturday. Elsewhere, for interior Humboldt and Del Norte counties high temperatures are also forecast to exceed the century mark, however overnight low temperatures are expected to mitigate the heat risk. Excessive Heat Warnings and Advisories remain in effect today through early Saturday evening. The afternoon heat will be harmful for those spending time outdoors without adequate hydration and cooling. Cloud cover on Sunday may also knock temperatures down several degrees, but it will still be hot in the interior.

Coastal areas will also warm up with afternoon temperatures climbing into the 70s. NBM indicates high probabilities for temperatures over 70F today and over 75F on Sat. It is not completely out of the question for highs in the lower to mid 80s on Sat. Chances for lower 90s are less probable, around 20-25% for inland areas like Fortuna. Southerly flow will develop on Sat, with a well mixed layer near the surface to 2km.

A high precipitable water (PWAT) anomaly (over 1 inch) associated with the remnants of tropical cyclone Elida will spread north over the area today. Radar mosaic has been showing returns offshore the central California Coast overnight, however no lightning activity just yet. The moisture and elevated convection appears to stay mostly offshore today. This will need to be watched as an upper level low meanders around offshore to our west. The forecast may need to be updated later this morning to include storms for Mendocino and Lake counties if the elevated returns offshore central California start producing lightning. BUFKIT soundings indicate slightly better chances of terrain driven storms with daytime heating on Saturday over the Trinity mountains. Another surge of mid/upper level moisture with PWAT over 1 inch will bring another potential for light showers and possible thunderstorms again on Sunday. With extremely parched conditions, the greatest impact from storms will be cloud-to-ground lightning strikes and fire starts. The coverage and duration of storms remains highly uncertain and a fire weather watch will not be hoisted at this time.

Above normal interior heat will continue through at least mid next week, with perhaps moderation toward the latter portion of the week. The potential for interior thunderstorms is non-zero all next week, around 5 to 10%.

AVIATION. In the early morning hours, satellite imagery revealed only some high clouds streaming northward. Beyond some possible highly isolated shallow low cloud layers developing in the early morning hours and through dawn, the area will be mostly void of stratus through Saturday as a dry air mass continues to envelop the column. Given the climatology of the area for this time of year, the words "void of stratus" causes some reserve, but widespread VFR seems likely through the period, including KUKI. Southerly flow throughout the column beginning Saturday will introduce some moisture again. Isolated thunderstorms will be possible around inland areas on Saturday and Sunday.

MARINE. Northerly winds and steep seas will continue to ease in the outer waters as the boundary of strongest winds backs away to the northwest throughout the day. The winds will turn southerly over all waters Saturday afternoon through Sunday, transitioning northerly again into Monday. These northerly winds will tick up around and south of Cape Mendocino on Monday, followed by expansion into the Southern Outer waters. A mid period swell of 3-4 feet at 10 seconds will move into the waters Sunday evening.

FIRE WEATHER. No changes to previous forecast thinking. Hot and dry conditions will persist through next week. Thunderstorms will be possible, generally a 10-20% chance, each afternoon through Sun. Locally breezy S-SW winds are expected over the weekend.

Previous discussion, issued 334 PM PDT Thu Aug 13 2020, follows:

Over the next several days there are multiple potential concerns pertaining to fire weather.

Firstly, an extended heatwave is expected to begin Friday and continue through at least the middle of next week, with some minor fluctuations in between. Afternoon temperatures are expected to range from anywhere between 5 and 10 degrees above seasonal averages, or in other words, between 100 and 110 degrees across interior lower elevations. Humidity will also remain low, with only moderate to poor overnight recoveries above the valley floor. These hot and dry conditions will persist for several days, and will put considerable stress on local vegetation at a time when fuels are already drier than usual.

Secondly, isolated to potentially scattered thunderstorms will be possible in the region between Friday and Sunday afternoon, although there is considerable uncertainty regarding the coverage and location of storms. While it appears that the most likely opportunity for thunderstorms will be Saturday across the mountains of Trinity, Del Norte, and northeast Mendocino counties, isolated storms will also be possible as soon as Friday afternoon and as late as Sunday afternoon. In any case, any storms that do develop are likely to have high cloud bases and produce only limited rainfall.

Finally, these thunderstorms will be followed by a period of breezy southwesterly winds, along with continued heat and low humidity. Sustained southwesterly winds of between 10 to 15 mph, with gusts to around 20 to 25 mph, will be common along upper slopes and ridges throughout the area, at a direction that is somewhat unusual for the time of year.

As of this writing, a Fire Weather Watch has not yet been issued, mostly due to the fact that thunderstorm coverage remains highly uncertain, and forecast tends indicate that the greatest threat is to the north of our forecast area. However, this will be closely monitored over the next 12 to 24 hours and a Watch remains possible. /BRC

EKA WATCHES/WARNINGS/ADVISORIES. CA . Heat Advisory from noon today to 7 PM PDT Saturday for CAZ102- 104>108.

Excessive Heat Warning from noon today to 7 PM PDT Saturday for CAZ110>115.

NORTHWEST CALIFORNIA COASTAL WATERS . Hazardous Seas Warning until noon PDT today for PZZ470. Small Craft Advisory until 5 PM PDT this afternoon 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
46244 - Humboldt Bay, North Spit, CA 19 mi22 min 54°F6 ft
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 35 mi28 min N 5.8 G 7.8 54°F 53°F6 ft1014 hPa52°F
46027 - ST GEORGES - 8NM West Northwest of Crescent City, CA 47 mi28 min N 12 G 14 54°F7 ft1014 hPa

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Arcata / Eureka, Arcata Airport, CA17 mi25 minE 310.00 miFair50°F48°F96%1013.9 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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Last 24hrCalmNW4N84W5NW6NW6NW6NW5NW5NW5W4W3CalmE3SE3E3CalmCalmE3E3SE3CalmE3
1 day agoS4S5CalmW7SW55NW8NW8NW7NW10NW9--NW5SE3SE4SE4SE4SE3S4SE4CalmSE3CalmCalm
2 days agoS3CalmS3W4W5W7SW7SW85W4NW63NW3CalmCalmCalmE3SE5SE4CalmCalmS3SE4SW4

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Fri -- 01:44 AM PDT     Moonrise
Fri -- 03:05 AM PDT     0.72 feet Low Tide
Fri -- 06:25 AM PDT     Sunrise
Fri -- 09:55 AM PDT     4.49 feet High Tide
Fri -- 02:21 PM PDT     3.46 feet Low Tide
Fri -- 05:11 PM PDT     Moonset
Fri -- 08:15 PM PDT     Sunset
Fri -- 08:30 PM PDT     6.30 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.71.710.70.91.52.33.13.94.34.54.343.73.53.53.94.55.25.86.26.25.84.8

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Fri -- 01:45 AM PDT     Moonrise
Fri -- 04:10 AM PDT     0.69 feet Low Tide
Fri -- 06:26 AM PDT     Sunrise
Fri -- 11:04 AM PDT     4.71 feet High Tide
Fri -- 03:24 PM PDT     3.54 feet Low Tide
Fri -- 05:10 PM PDT     Moonset
Fri -- 08:15 PM PDT     Sunset
Fri -- 09:31 PM PDT     6.78 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.331.910.70.91.52.33.244.54.74.64.23.83.63.644.75.66.36.76.76.3

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Eureka, CA (10,2,3,4)
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Ground Weather Radar Station Eureka, CA
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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.