Sunday, August9, 2020
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Marine Weather and Tides
Samoa, 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 6:20AMSunset 8:23PM Sunday August 9, 2020 3:45 AM PDT (10:45 UTC) Moonrise 10:38PMMoonset 11:09AM Illumination 71% Phase: Waning Gibbous; Moon at 20 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;;301382 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 252 Am Pdt Sun Aug 9 2020
Synopsis for northern california waters..Strong northerly winds and large steep seas will persist through tonight across the outer waters and around pt st george. Seas will remain steep and hazardous for the inner waters today through tonight, primarily north of cape mendocino. Brisk northerly winds will prevail across the outer waters through much of next week, with generally lighter winds for the inner waters.


7 Day Forecast for Marine Location Near Samoa, CA
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location: 40.81, -124.19     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 091035 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 335 AM PDT Sun Aug 9 2020

SYNOPSIS. An interior warming trend will continue through Monday, with mild but mostly sunny conditions along the coast. There is a slight chance for thunderstorms over the interior mountains of Trinity and Mendocino Counties on Monday.

DISCUSSION. An upper level ridge remains in place across northern California today, extending from an elongated area of high pressure encompassing much of the eastern Pacific. Associated height rises will support a continued warming trend over the next couple days, with afternoon highs topping out near or slightly above 100 degrees in many of the interior valleys today and Monday. While we may see some scattered showers from building cumulus in the mountains this afternoon, tomorrow afternoon still looks to have a better chance for thunderstorm development as the ridge axis shifts southward and is replaced by weak cyclonic flow on the southern periphery of a developing Pac NW trough. This will introduce an uptick in mid level moisture, which coupled with strong surface heating will generate sufficient conditional instability for a few thunderstorms if capping can be overcome in the 850-700 mb layer. The most favorable areas for initiation will be the higher terrain of the Yolla Bollys and the Trinity Alps, with weak steering flow likely keeping any convection mostly confined to those areas. Have therefore maintained a slight chance of thunderstorms on Monday with this morning's forecast package.

Meanwhile, coastal stratus coverage will remain relatively limited for the next few days as increased subsidence and weak NE flow keeps the marine layer shallow. There will likely still be some periods of southerly surging stratus and fog along portions of the coast, but this should dissipate quickly each day and yield mostly sunny skies through Monday. Increased troughing over the West Coast during the middle of the week will serve to deepen the marine layer and could signal a return to more a of typical late summer diurnal cycle with respect to marine cloudiness after Tuesday. This will also return interior temperatures closer to seasonal normal values for the rest of the week, although afternoon highs will still reach into the 90s in many locations.

AVIATION. Light offshore flow has suppressed stratus development again overnight. Granted light mist and haze will be possible at the coast terminals, but overall VFR is expected to prevail. KUKI and other interior airfields should remain VFR through the period, though smoke from the Red-Salmon complex may create MVFR vsby obscurations and smokey layers aloft. Also, there is a slight potential for low level wind shear at KCEC this morning with NE winds around 25kt at 1000-2000 ft AGL. The primary aviation hazard today will be stratus meandering northward along the Mendocino coast. High resolution models, primarily the ARW, has the stratus and fog rounding Cape Mendocino late tonight and advecting toward KACV and KCEC Monday morning. If this occurs, LIFR conditions will likely spread over or nearby the coastal forecast terminals.

MARINE. A tight pressure gradient between high pressure offshore and a thermal trough along the northern California coast will result in strong northerly winds through tonight. Gale force winds are expected north of Cape Mendocino through tonight, primarily outside 20NM from shore. A Hazardous Seas Warning and Small Craft Advisories remain in effect for the remainder of the coastal waters through tonight. The exception will be for Mendocino nearshore waters, where north winds should abate today and switch to light southerly. Seas will likely remain steep and hazardous through at least this morning, however.

Winds should finally relax somewhat on Monday before picking up again by mid week. Brisk northerlies can be expected to persist for much of next week, strongest across the outer waters.

FIRE WEATHER. Increasing temperatures and corresponding lower RH values are expected through early this week. This combined with a light but persistent offshore flow at night will also contribute to poorer RH recoveries . especially along the upper slopes and ridge tops. Afternoon highs are expected to peak in the low 100s today and Monday. Daytime winds will generally be driven by terrain but backed by a westerly component. Some stronger overnight offshore gusts are also likely across the ridges of Del Norte County through Sunday. In addition, unstable conditions and deep mixing heights will likely develop Sunday and Monday afternoon. A slight chance of thunderstorms will return to the area Monday afternoon, likely remaining confined to the higher terrain of Trinity and eastern Mendocino County. Any lighting may be initially dry.

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 11 PM PDT this evening for PZZ450.

Gale Warning until 3 AM PDT Monday for PZZ470.

Small Craft Advisory until 9 AM PDT this morning for PZZ455.

Hazardous Seas Warning until 3 AM PDT Monday for PZZ475.



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 3 mi69 min 58°F1014.5 hPa
NJLC1 4 mi93 min SSW 5.8 G 5.8 54°F
46244 - Humboldt Bay, North Spit, CA 11 mi49 min 55°F10 ft
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 21 mi25 min N 19 G 23 55°F 55°F1014.5 hPa52°F
46213 - Cape Mendocino, CA (094) 46 mi49 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
Arcata / Eureka, Arcata Airport, CA13 mi52 minE 39.00 miFair51°F48°F92%1014.5 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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Last 24hrCalmE3CalmE3CalmW4W4W4W5NW8NW9NW10NW10N10N13
G20
N9--SE6S5SE7SE5CalmE3E3
1 day agoCalmE3CalmCalmCalmCalmW44W5NW6NW5NW15NW15NW14NW16N11NW6S5SE6SE5SE5SE5CalmE3
2 days agoCalmCalmCalmCalmCalmNW6N6NW3NW9NW14NW17NW16NW14NW12N13NW11NW9N6CalmS4SE4E3NE3Calm

Tide / Current Tables for Eureka, Humboldt Bay, California (2)
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Eureka
Click for Map
Sun -- 04:23 AM PDT     5.68 feet High Tide
Sun -- 06:21 AM PDT     Sunrise
Sun -- 10:26 AM PDT     1.38 feet Low Tide
Sun -- 12:09 PM PDT     Moonset
Sun -- 05:15 PM PDT     6.43 feet High Tide
Sun -- 08:21 PM PDT     Sunset
Sun -- 11:21 PM PDT     2.13 feet Low Tide
Sun -- 11:38 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.93.74.65.35.65.654.1321.51.5234.25.36.16.46.35.74.73.62.62.2

Tide / Current Tables for Fields Landing, Humboldt Bay, California
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Fields Landing
Click for Map
Sun -- 03:56 AM PDT     5.30 feet High Tide
Sun -- 06:21 AM PDT     Sunrise
Sun -- 10:17 AM PDT     1.33 feet Low Tide
Sun -- 12:09 PM PDT     Moonset
Sun -- 04:48 PM PDT     6.00 feet High Tide
Sun -- 08:21 PM PDT     Sunset
Sun -- 11:12 PM PDT     2.05 feet Low Tide
Sun -- 11:38 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.93.74.55.15.35.14.43.62.61.81.41.52.13.14.35.25.865.754.13.12.42.1

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 (6,6,7,8)
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Ground Weather Radar Station Eureka, CA
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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.