Monday, November30, 2020
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Marine Weather and Tides
Trinidad, 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 7:19AMSunset 4:50PM Monday November 30, 2020 8:28 AM PST (16:28 UTC) Moonrise 5:13PMMoonset 7:37AM Illumination 100% Phase: Full Moon; Moon at 15 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- 229 Am Pst Mon Nov 30 2020
.small craft advisory in effect from noon pst today through Tuesday morning...
Today..N winds 5 to 15 kt. Waves nw building to 13 ft at 17 seconds. Chance of rain. Isolated showers.
Tonight..N winds 5 to 15 kt. Waves N 4 ft at 7 seconds...and nw 13 ft at 16 seconds.
Tue..N winds 5 to 15 kt. Waves nw 11 ft at 14 seconds. Patchy fog.
Tue night..E winds 5 kt. Waves nw 8 ft at 13 seconds.
Wed..SE winds 5 kt. Waves W 8 ft at 21 seconds.
Thu..N winds 5 kt. Waves W 13 ft at 18 seconds.
Fri..NE winds 5 kt. Waves W 9 ft at 15 seconds.
PZZ400 229 Am Pst Mon Nov 30 2020
Synopsis for northern california waters..A series of mid to long-period northwest swells will continue through the week, with the largest swell moving through the waters during Thursday. Otherwise, a period of southerlies during the morning will transition to northerlies during the afternoon, and then become gusty during Tuesday.


7 Day Forecast for Marine Location Near Trinidad, CA
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location: 41.06, -124.14     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 301305 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 505 AM PST Mon Nov 30 2020

SYNOPSIS. A weak front will bring clouds and some light rain to Del Norte and Humboldt counties. Another frosty morning is expected for some areas tomorrow as skies clear out with light winds. Persistent high pressure will result in an extended period of dry and mild weather starting on Tuesday and lasting into the weekend.

DISCUSSION. The tail-end of a cold front will clip northern portions of our forecast area with some light rain today, mainly this morning. KBHX radar is beginning to show some light reflectivity in the vicinity of Crescent City, and Brookings has reported rain as of 4 AM PST. Little has changed with the expected amounts, with a tenth to maybe a quarter-inch across Del Norte, dropping off to just trace amounts in southern Humboldt and most of Trinity. Most of interior Mendocino and Lake Counties will have a fair amount of sunshine today as they miss out on any rain. The associated shortwave trough axis will pass quickly east of our area, with rising heights, subsidence and drier air filtering in this afternoon. Most guidance keeps the coast fairly cloudy through sunset, but would not rule out some partial clearing late, especially along the Del Norte coast. Heading into tonight, we have issued yet another Frost Advisory for portions of coastal northern Humboldt County, and portions of Mendocino county may need to be included as well. Lingering moisture and some valley fog development may limit radiational cooling and frost formation, with less than high confidence in the forecast low temperatures. However, there is enough support from the guidance for clearing skies, light winds, and temperatures dropping into the mid-30s for parts of the coast to pull the trigger on an advisory.

Otherwise, the rest of the week and even into next weekend looks extremely quiet, with likely an extended stretch of dry weather for northwest California. A building upper level ridge over California and the Pacific Northwest will take on a Rex Block configuration, which will keep any northern Pacific storm systems from reaching us. One system attempting to run into the ridge may 'split' enough moisture toward northern California for some increased clouds on Thursday. A similar scenario is possible again later in the weekend, but otherwise prospects for rain aren't looking good until the ridge breaks down, perhaps as we head into mid December. High temperatures look unseasonably mild with light winds forecast through the weekend. /AAD

AVIATION. VFR to MVFR conditions are prevailing at the coastal terminals as a cold front system moves across the region. Light rain is expected at KCEC and KACV during this morning as a result. Winds will remain lighter, but marginal low level wind shear will be likely from 14 to 16Z at CEC. Conditions are expected to gradually improve during the afternoon into evening as a high pressure builds once again over the eastern Pacific to favor a dry subsidence conditions. Meanwhile, VFR and mostly clear skies is expected to prevail at KUKI.

MARINE. A long period NW swell around 13 feet at 17 seconds, is expected to move across the outer water during this morning and then spread to the inner coastal waters by the afternoon. A Small Craft Advisory will be in effect from this morning to cover the conditions. Additional, a small risk of sneaker waves will be likely for the Mendocino coast during the afternoon as a result.

Southerly winds has developed during this morning across the waters, but these will transition to northerlies during the afternoon as a cold front continue moving eastward. Northerlies will gradually increasing during the evening into Tuesday as a high pressure builds further over the region, strengthening the pressure gradient. Seas are expected to diminish Tuesday into Wednesday, but will remain steep across the outer waters. A significant west-northwesterly long period swell will arrive on Wednesday, building into Thursday. This will likely result in a shoaling threat, particularly for northwest- facing portions of the coast.

BEACH HAZARDS. A long period west-northwest swell is still on track to arrive on Wednesday. Little has changed with respect to the high risk of sneaker waves, with light winds and little to interfere with the set behavior. Additionally, sunny skies and mild temperatures will tend to lure folks to the beaches, thus have issued a Beach Hazards Statement to highlight the threat. If anything, the projected timing has sped up a bit, so the risk will begin in the morning and continue into Wednesday night. On Thursday the waves build high enough to keep them from being as 'sneaky', but there still may be some set behavior. /AAD

EKA WATCHES/WARNINGS/ADVISORIES. CA . Frost Advisory until 9 AM PST this morning for CAZ109.

Beach Hazards Statement from Wednesday morning through Wednesday evening for CAZ101-103-104-109.

Frost Advisory from midnight tonight to 9 AM PST Tuesday for CAZ103.

NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory from noon today to noon PST Tuesday for PZZ450-455.

Small Craft Advisory until midnight PST Tuesday night for PZZ470- 475.



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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
46244 - Humboldt Bay, North Spit, CA 16 mi62 min 52°F9 ft
HBYC1 - 9418767 - North Spit, CA 21 mi52 min 50°F1026.7 hPa
NJLC1 21 mi64 min ESE 9.7 G 14 43°F
CECC1 - 9419750 - Crescent City, CA 47 mi58 min SE 12 G 16 49°F 50°F1026.4 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, CA5 mi35 minE 710.00 miOvercast0°F0°F%1026.7 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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Last 24hrCalmCalmCalmW5NW6CalmNW3CalmE3CalmE3E4E4E4E3E4E5E4CalmSE5SE9CalmE6E7
1 day agoCalmN3NW4NW4CalmNW4NW6NW4SW3E4CalmE3CalmCalmE3E4CalmE4SE4E4CalmSE4E3E3
2 days agoSE5CalmCalmSW7W3NW3NW4NW4N4E4E4E5E3SE6E3E3CalmE4E4E3CalmCalmCalmE3

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Mon -- 01:32 AM PST     Full Moon
Mon -- 04:55 AM PST     3.19 feet Low Tide
Mon -- 07:21 AM PST     Sunrise
Mon -- 07:37 AM PST     Moonset
Mon -- 10:48 AM PST     7.11 feet High Tide
Mon -- 04:48 PM PST     Sunset
Mon -- 05:13 PM PST     Moonrise
Mon -- 05:54 PM PST     -0.37 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.55.34.73.93.43.23.54.25.26.26.97.16.65.642.40.9-0.1-0.401.12.43.84.9

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Mon -- 01:06 AM PST     5.53 feet High Tide
Mon -- 01:32 AM PST     Full Moon
Mon -- 06:02 AM PST     3.07 feet Low Tide
Mon -- 07:21 AM PST     Sunrise
Mon -- 07:36 AM PST     Moonset
Mon -- 11:52 AM PST     7.27 feet High Tide
Mon -- 04:49 PM PST     Sunset
Mon -- 05:13 PM PST     Moonrise
Mon -- 07:04 PM PST     -0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.25.55.34.743.33.13.34.15.26.377.36.95.94.42.71.1-0.1-0.5-0.20.82.23.5

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
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.