Monday, March30, 2020
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Marine Weather and Tides
Mendocino, 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 6:57AMSunset 7:36PM Monday March 30, 2020 6:06 AM PDT (13:06 UTC) Moonrise 9:44AMMoonset 12:00AM Illumination 39% Phase: Waxing Crescent; Moon at 6 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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PZZ455 Cape Mendocino To Pt Arena Out 10 Nm- 244 Am Pdt Mon Mar 30 2020
Today..SW winds 5 to 15 kt. Waves nw 5 ft at 11 seconds. Rain.
Tonight..SW winds 5 to 10 kt. Waves nw 7 ft at 11 seconds. Chance of rain.
Tue..NW winds 5 to 10 kt. Waves nw 8 ft at 12 seconds. Chance of showers.
Tue night..N winds 10 to 15 kt. Waves nw 10 ft at 12 seconds.
Wed..N winds 15 to 20 kt. Waves nw 9 ft at 11 seconds.
Thu..NW winds 10 to 20 kt. Waves N 7 ft at 7 seconds.
Fri..NW winds 5 to 10 kt. Waves nw 6 ft at 8 seconds...and S 2 ft at 16 seconds.
PZZ400 244 am pdt Mon mar 30 2020 synopsis for northern california waters..A period of stronger southerly winds will continue early this morning before weakening and turning southwest, accompanied by some briefly rougher seas. A moderate period northwest swell is expected to build in tonight and Tuesday.


7 Day Forecast for Marine Location Near Mendocino, CA
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location: 39.3, -123.8     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 301102 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 402 AM PDT Mon Mar 30 2020

SYNOPSIS. Rain is spreading across the area from north to south this morning and will start to taper off this afternoon. Tonight into Tuesday morning another round of showers is expected. Dry and chilly weather is expected Wednesday and THursday mornings with another chance for rain Friday.

DISCUSSION. A shortwave moving through the mainly zonal flow into the Pacific Northwest and this is bringing a trailing frontal boundary across the area this morning. Light to moderate rain is spreading south and east across the area this morning and most areas will see at least some light rain by sunrise. The exception will likely by southern Mendocino and Lake counties where it may take until mid to late morning for the rain to start. With the cold air well to the north snow levels will be mainly around 5,000 feet. Rainfall amounts today will be around a half inch in most areas with lower amounts in southern Mendocino and Lake counties. Local amounts over 2 inches are possible in the mountains of Humboldt and Del Norte counties. Most highways passes are not expected to see snow. Exposed areas this morning along the Humboldt and Del Norte coasts and over the higher terrain have been seeing gusts to 30 to 40 mph, but the peak is expected to be around this time and they will diminish later today.

Tonight into Tuesday morning a second wave moving through the zonal flow is expected to bring additional rain and snow to mainly Humboldt and Del Norte counties. Once again the cold air remains mainly to the north of the area, but snow levels may fall slightly to around 4,000 feet in Del Norte county with higher levels elsewhere. This could bring some snow to Scott Mountain Pass on Highway 3, but amounts will be fairly light.

Tuesday night into Wednesday will be a chilly morning, but for now it looks like there will be too much lingering fog for frost to be a significant concern. The exception could be southern Mendocino and Lake counties if they don't see much rain. This will need to be watched as it gets closer. Thursday morning fog coverage is expected to be significantly less with another day to dry out. This will allow Mendocino and Lake county valleys to see more widespread frost or freezing temperatures.

Late Friday and into the weekend models are starting to show another weather system moving into the area. There are still a lot of questions on this system, but there is general agreement in the ensembles that we could see a half to one and a half inches of rain in most areas. Ensembles are generally keeping snow levels over 4,000 feet. This system is a fairly big change in the models, but there is pretty good agreement across the ensembles. So have increased pops to chance for Friday and into the weekend. MKK

AVIATION. A front approaches the coast early this morning, bringing some heavier showers, gusty south winds and brief/local MVFR visibilities, primarily for areas north of Mendocino County. Conditions may temporarily worsen to IFR should one of these heavier shower move directly over a terminal, but are then expected to improve this afternoon after the front passes. Yet another front will bring more rain and locally gusty southerly winds late tonight and Tuesday morning, with showers potentially reaching farther toward the south than the front that passed this morning. /TDJ

MARINE. Gusty southerlies are expected to turn westerly and weaken later this morning an approaching front moves onshore. Winds should then veer back toward the southwest late tonight as yet another front approaches the coast. This next batch of southerlies is expected to be below advisory levels, however a moderately fresh NW swell is expected to fill in as they develop. This swell looks to be just shy of 10 ft, bringing combined seas for Tuesday/Wednesday in the 9 to 10 ft range . may end up needing another SCY to cover the potentially hazardous seas. Northerly winds are currently expected to develop late Wednesday and persist for a couple days, bringing near- advisory level conditions to at least the southern waters later this week, with the strongest winds in their usual spot to the south of Cape Mendocino. /TDJ

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 10 AM PDT this morning for PZZ450.

Small Craft Advisory until 9 AM PDT this morning for PZZ470.



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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
46014 - PT ARENA - 19NM North of Point Arena, CA 10 mi36 min SSE 12 G 14 53°F 52°F1022.9 hPa51°F
ANVC1 - 9416841 - Arena Cove, CA 27 mi66 min E 4.1 G 5.1 50°F 53°F1023.5 hPa (+0.6)

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA34 mi10 minN 010.00 miOvercast48°F45°F89%1023.5 hPa

Link to 5 minute data for KUKI

Wind History from UKI (wind in knots)
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Last 24hrCalmCalmCalmCalmSE3SE8SE743SE4S44SE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalm4S6SE6S3SE3SE3S3S3S4S3S4S4CalmCalmCalmE3N3Calm
2 days agoCalmN34Calm3NW4NW7NW6
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Tide / Current Tables for Mendocino, Mendocino Bay, California
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Mendocino
Click for Map
Mon -- 12:53 AM PDT     Moonset
Mon -- 02:54 AM PDT     5.11 feet High Tide
Mon -- 07:01 AM PDT     Sunrise
Mon -- 10:05 AM PDT     0.42 feet Low Tide
Mon -- 10:43 AM PDT     Moonrise
Mon -- 05:25 PM PDT     3.68 feet High Tide
Mon -- 07:37 PM PDT     Sunset
Mon -- 09:46 PM PDT     3.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.94.54.95.14.94.33.32.21.30.70.40.61.11.72.433.43.73.73.53.33.13.13.3

Tide / Current Tables for Point Cabrillo, California Current
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Point Cabrillo
Click for Map
Mon -- 12:53 AM PDT     Moonset
Mon -- 01:06 AM PDT     0.47 knots Max Flood
Mon -- 03:38 AM PDT     -0.00 knots Slack
Mon -- 07:01 AM PDT     Sunrise
Mon -- 07:24 AM PDT     -1.03 knots Max Ebb
Mon -- 10:43 AM PDT     Moonrise
Mon -- 11:19 AM PDT     0.00 knots Slack
Mon -- 02:21 PM PDT     0.66 knots Max Flood
Mon -- 06:01 PM PDT     -0.00 knots Slack
Mon -- 07:38 PM PDT     Sunset
Mon -- 08:03 PM PDT     -0.43 knots Max Ebb
Mon -- 10:53 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.40.2-0.1-0.4-0.8-1-1-0.7-0.4-0.10.20.50.70.60.50.30-0.3-0.4-0.3-0.10

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 (9,2,3,4)
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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.