Monday, December16, 2019
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Marine Weather and Tides
Westhaven-Moonstone, 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 7:32AMSunset 4:50PM Sunday December 15, 2019 11:15 PM PST (07:15 UTC) Moonrise 8:38PMMoonset 10:43AM Illumination 79% Phase: Waning Gibbous; Moon at 19 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- 820 Pm Pst Sun Dec 15 2019
.small craft advisory in effect until 3 am pst Monday...
Tonight..SE winds 5 to 10 kt. Waves W 11 ft at 13 seconds. Slight chance of rain.
Mon..S winds 5 to 10 kt. Waves W 8 ft at 12 seconds.
Mon night..SE winds 5 to 10 kt. Waves sw 2 ft at 5 seconds... And W 9 ft at 15 seconds.
Tue..SE winds 5 to 10 kt. Waves sw 2 ft at 6 seconds...and W 8 ft at 15 seconds.
Tue night..SE winds 10 kt. Waves sw 6 ft at 11 seconds...and W 10 ft at 18 seconds.
Wed..S winds 10 to 20 kt. Waves S 5 ft at 9 seconds...and W 11 ft at 16 seconds.
Thu..S winds 20 to 25 kt. Waves S 12 ft at 10 seconds...and nw 10 ft at 19 seconds.
Fri..S winds 15 to 25 kt. Waves sw 8 ft at 10 seconds...and nw 8 ft at 17 seconds.
PZZ400 820 Pm Pst Sun Dec 15 2019
Synopsis for northern california waters..Northwest breezes will shift to the south through this evening, with light to moderate southerlies then persisting through Monday night. Southerly winds will increase on Tuesday. A large, long-period northwest swell will very slowly subside through the middle of the week.


7 Day Forecast for Marine Location Near Westhaven-Moonstone, CA
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location: 41.05, -124.1     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 152255 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 255 PM PST Sun Dec 15 2019

SYNOPSIS. Mainly dry weather is expected through Tuesday. There is the potential for some periods of rain, especially in the north, Wednesday through Friday. There is a better chance for rain on Saturday.

DISCUSSION. High pressure has started building into the area and most of the showers have come to an end this afternoon. Temperatures range from the min 40s inland to low 50s along the coast and in some of the warmer valleys this afternoon. Some high clouds have started to move over the area as a weak warm front approaches the area. This will bring some high clouds to the area tonight. The most recent operational models are keeping the area dry, but it is still possible to see some light rain or sprinkles in the north overnight. The high clouds are not expected to be thick enough in most areas to keep the valley clouds and fog away so expect these will be prevalent across much of the area.

Monday, areas that see low clouds and fog and may struggle to warm up and clouds may not clear until early afternoon. This will likely keep highs in the 40s in many of the interior valleys. Fog is expected again Monday night into Tuesday morning, however southeast flow ahead of the next system may help it to clear out more quickly. This may also help the coastal areas to warm into the low 60s so went above the NBM guidance.

Tuesday afternoon most operational models keep the area dry, however the NBM is showing a slight chance late in the afternoon or evening. Models are showing this system to be a trough approaching the area and then most of the energy going into a cutoff low and and moving into central CA Tuesday night and Wednesday. This is not a high confidence pattern and we could end up seeing more or less rain than currently expected.

Once the previous system moves out of the area the models continue to struggle on the details, but overall the pattern is starting to become clearer. Once the upper low moves out of the area on Wednesday moist west to southwest flow sets up. It looks like a wave moving through will bring some warm frontal precip to the area on Thursday. The main question will be how far south it will make it. The NBM has fairly decent precip amounts in the north, but keeps Mendocino county mainly dry. This boundary could easily move north or south by 100 miles and dramatically change the forecast. Friday there is general agreement that this boundary will shift back north and most of the rain be north of Humboldt county. Saturday at some point it looks like the front will bring widespread heavy rain across the entire area, although it will be fairly short-lived and significant impacts are not expected from this alone. If the northern areas don't see a break in the rain on Friday there is the potential for some flooding, but there is still a lot of uncertainty on this. MKK

AVIATION. Extensive mid to high cloudiness lingers across NW CA this afternoon as showers have tapered off in the wake of yesterday's system. This has left VFR conditions with light winds in place across the area as high pressure builds into the region. Increasing subsidence and residual low level moisture may be enough to generate some patchy shallow fog overnight, but this will also be counteracted by increasing light offshore flow. Therefore, expecting VFR conditions to prevail at the terminals overnight into Sunday, with additional clearing during the day on Monday as the ridge axis moves overhead. /CB

MARINE. Moderate northwesterly breezes behind yesterday's front will give way to generally light southerlies across the area this during the evening. This wind regime is expected to persist through Monday evening, with relatively flat short period seas. The large NW swell which has been moving through the waters for the past several days will therefore remain the dominant wave group through the early part of the week as it slowly decays. The swell is forecast to drop below 10 feet overnight tonight, which should allow to Small Craft Advisories to come to an end by later this evening. Small Craft conditions will then return on Tuesday as southerlies increase ahead of the next system. This looks to be followed by a brief lull on Wednesday before the return of stronger southerlies late in the week. Meanwhile, the next large NW swell will enter the waters by Thursday at around 13-15 ft at 17-18 seconds. This coupled with increasing short period seas out of the south has the potential to create a chaotic and hazardous sea state towards the end of the week. /CB

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 9 PM PST this evening for PZZ450-455- 470-475.



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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 17 mi16 min 53°F10 ft
HBYC1 - 9418767 - North Spit, CA 21 mi40 min 53°F1026.7 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 33 mi26 min ESE 5.8 G 7.8 50°F 54°F10 ft1026.6 hPa47°F
CECC1 - 9419750 - Crescent City, CA 48 mi52 min NNE 4.1 G 5.1 41°F 52°F1026.7 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, CA4 mi23 minE 37.00 miFair41°F37°F89%1027.4 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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Last 24hrSE8SE10SE6SE6SE7SE7SE5CalmE4E5E3SE6S5CalmW5NW5W4CalmE4E4E3E3CalmE3
1 day agoNE3SE3CalmCalmE4E4E5CalmE3SE3SE6SE4SE5S3S5SE6SE10CalmE4CalmS6S5E5SE5
2 days agoE3E4E5S6SE4SE6SE9SE8SE8S8S10S10S4S7S9S7S10S9S8SW12N10N8N4Calm

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Mon -- 03:04 AM PST     6.07 feet High Tide
Mon -- 07:35 AM PST     Sunrise
Mon -- 08:11 AM PST     3.49 feet Low Tide
Mon -- 11:24 AM PST     Moonset
Mon -- 01:50 PM PST     6.90 feet High Tide
Mon -- 04:49 PM PST     Sunset
Mon -- 08:58 PM PST     -0.44 feet Low Tide
Mon -- 09:49 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.44.85.76.15.85.24.53.83.53.64.25.166.76.96.55.542.40.9-0.1-0.4-0.10.9

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Mon -- 04:13 AM PST     5.90 feet High Tide
Mon -- 07:34 AM PST     Sunrise
Mon -- 09:15 AM PST     3.40 feet Low Tide
Mon -- 11:24 AM PST     Moonset
Mon -- 02:48 PM PST     7.12 feet High Tide
Mon -- 04:49 PM PST     Sunset
Mon -- 09:50 PM PST     Moonrise
Mon -- 10:09 PM PST     -0.73 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.53.14.55.55.95.85.24.53.83.43.64.25.26.26.97.16.75.74.22.51-0.2-0.7-0.4

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

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Wind Forecast for Eureka, CA (2,6,7,8)
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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 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.