Thursday, December12, 2019
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Marine Weather and Tides
Big Lagoon, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:29AMSunset 4:49PM Wednesday December 11, 2019 10:27 PM PST (06:27 UTC) Moonrise 4:44PMMoonset 6:53AM 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- 829 Pm Pst Wed Dec 11 2019
.small craft advisory in effect through Friday evening...
Tonight..S winds 10 to 20 kt. Waves S 7 ft at 8 seconds...and W 13 ft at 18 seconds. Rain.
Thu..S winds 10 to 15 kt. Waves W 15 ft at 18 seconds. Rain likely.
Thu night..S winds 5 to 10 kt. Waves W 15 ft at 16 seconds. Rain likely.
Fri..S winds 5 to 15 kt. Waves W 15 ft at 18 seconds.
Fri night..NW winds 5 to 10 kt. Waves W 14 ft at 16 seconds.
Sat..SW winds 5 to 10 kt. Waves W 11 ft at 15 seconds. Showers likely and slight chance of tstms.
Sun..S winds 5 kt. Waves W 12 ft at 13 seconds.
Mon..SE winds 5 to 10 kt. Waves nw 5 ft at 15 seconds.
PZZ400 829 Pm Pst Wed Dec 11 2019
Synopsis for northern california waters..An active weather pattern continues to drive moderate south and southwest winds across the coastal waters. A large, long period west to northwest swell is forecast to impact the waters on Thursday and Friday.


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 112244 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 244 PM PST Wed Dec 11 2019

SYNOPSIS. A period of light to moderate rain is expected tonight. Occasional light rain is expected on Thursday. Another round of rain is expected Friday afternoon and evening. Saturday afternoon showers and lower snow levels are expected. Sunday into early next week a short dry period is expected.

DISCUSSION. Moist zonal flow is continuing to bring clouds and some occasional rain to the area this afternoon. A period of heavier rain is expected late this afternoon and evening as a shortwave moves through the zonal flow. Temperatures will remain fairly warm and snow levels remain high. Rainfall amounts are expected to range from a quarter to a half inch in the valleys and along the coast while, the mountains and south slopes will see over 1.5 to 2.5 inches.

Thursday the warm moist zonal flow continues. At this point it looks like there will be a shortwave moving through bringing rain to mainly Del Norte county, but there may be some rain on the westerly slopes across the area as well. Most areas will only see a tenth to a quarter of an inch, but interior Del Norte county may see upwards of an inch. Friday another shortwave is expected to spread heavier precip across the area in the afternoon. The warm airmass is still in place. Rainfall totals are expected to vary widely. Due to the weakly forced nature the terrain influences on precip amounts are expected to be bigger than normal. River flooding is not expected, however there will be rapid rises on the rivers, especially the Smith river.

Late Friday night into Saturday morning there is expected to be a short break in the rain. Saturday afternoon the pattern starts to slightly change. Flow becomes more northwest and a colder system moves down from the north. This will drop snow levels and bring a more convective regime to the area. This has the potential to bring some thunderstorms and/or small hail to the coastal areas. Currently the GFS is colder and slightly more unstable with around 100 j/kg of cape along the coast. In addition to this snow levels are expected to fall to around 3,000 to 4,000 feet which could impact passes. Currently don't have thunderstorms in the forecast over land, but they may need to be added if the models trend toward the GFS. The NBM thunder probabilities were between 15 and 20 percent along the coast Saturday evening.

Sunday and Monday high pressure is expected to return. The inland valleys are expected to see numerous areas of fog and low clouds. Tuesday or Wednesday the wet pattern is expected to return, but confidence is low on the details at this point. MKK

AVIATION. A frontal boundary and associated rain moving through late this afternoon and evening will lower CIGS and VIS to MVFR and locally IFR. This will also bring breezy south winds along the coast with gusts to 25 kt possible. Rain will taper off later tonight, but conditions may remain MVFR into the morning. Thursday another wave moving through will bring additional rain to the area mainly focused on Del Norte county and areas north. The valleys may continue to see low clouds and fog. MKK

MARINE. The Northwest coast will get a mix of wave states tonight as long period westerly swells and southerly wind waves inundate the shoreline. Westerly swells of 8 feet at 16 seconds will merge with the southerly, 8 feet at 8 seconds, until the winds veer west over the southern waters Thursday morning. Strong southerly winds in excess of 22 knots this evening will decouple to 10 knots early Thursday morning. The Westerly swell will dominate the sea state, Thursday through Sunday with 16 foot seas at 16 second periods. Small Craft advisories for Northern outer waters tonight with SCY and SUY through the weekend. /EYS

BEACH HAZARDS. West facing beaches North of Cape Mendocino will be dangerous as the approaching westerly swell arrives. A High Surf advisory is in effect for the northern coastline from 3 am Thursday to 3 pm Friday. Large breaking waves in excess of 20 feet are to be expected. Dominant wave periods in theses ranges can be very dangerous to beachgoers. Be aware and never turn your back to the ocean. /EYS

In addition to the high surf, tides are high this week. The prolonger period of southerly winds have elevated water levels about three quarters of a foot inside Humboldt Bay. This may be enough to bring some minor flooding to King Salmon and the Arcata Bottoms Thursday and Friday mornings.

EKA WATCHES/WARNINGS/ADVISORIES. CA . High Surf Advisory from 9 AM Thursday to 9 AM PST Friday for CAZ109.

High Surf Advisory from 3 AM Thursday to 3 PM PST Friday for CAZ101-103-104.

NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory from 9 PM this evening to 9 PM PST Friday for PZZ450-455.

Small Craft Advisory until 9 PM PST Friday for PZZ470-475.



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 mi28 min 54°F9 ft
HBYC1 - 9418767 - North Spit, CA 28 mi52 min 53°F1018.2 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 34 mi38 min S 19 G 27 56°F 54°F10 ft1018.2 hPa55°F
CECC1 - 9419750 - Crescent City, CA 40 mi64 min S 11 G 14 53°F 51°F1017.5 hPa
46027 - ST GEORGES - 8NM West Northwest of Crescent City, CA 47 mi28 min S 21 G 27 55°F 1017.7 hPa (+0.8)53°F

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 mi35 minSE 32.00 miRain Fog/Mist57°F54°F90%1018.8 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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1 day agoCalmE4CalmE5E6SW3E6SE6E3W6E6CalmE4E5CalmCalmE3SE6SE6S3NE5CalmCalmE4
2 days agoCalmCalmE3CalmCalmCalmE4CalmCalmE3CalmCalmCalmW5W5NW3NW4NW4CalmCalmCalmCalmCalmCalm

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Thu -- 12:00 AM PST     5.74 feet High Tide
Thu -- 04:57 AM PST     3.18 feet Low Tide
Thu -- 07:32 AM PST     Sunrise
Thu -- 07:56 AM PST     Moonset
Thu -- 10:52 AM PST     7.59 feet High Tide
Thu -- 04:48 PM PST     Sunset
Thu -- 05:30 PM PST     Moonrise
Thu -- 06:00 PM PST     -0.88 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.75.54.843.43.23.54.35.46.57.37.67.15.94.32.40.7-0.5-0.9-0.50.62.13.64.9

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Thu -- 01:10 AM PST     5.61 feet High Tide
Thu -- 06:03 AM PST     3.07 feet Low Tide
Thu -- 07:31 AM PST     Sunrise
Thu -- 07:56 AM PST     Moonset
Thu -- 11:53 AM PST     7.73 feet High Tide
Thu -- 04:48 PM PST     Sunset
Thu -- 05:31 PM PST     Moonrise
Thu -- 07:11 PM PST     -1.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.25.65.44.84.13.43.13.34.25.46.67.47.77.36.24.62.70.9-0.5-1-0.80.31.73.3

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 (1,6,7,8)
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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 numerious 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.