Thursday, April9, 2020
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Marine Weather and Tides
Manila, 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 6:44AMSunset 7:51PM Thursday April 9, 2020 3:44 PM PDT (22:44 UTC) Moonrise 9:10PMMoonset 7:04AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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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PZZ410 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 244 Pm Pdt Thu Apr 9 2020
Synopsis for northern california waters..Northerly winds will continue to slowly diminish tonight, then increase again Friday night into the weekend. Steep short period seas will persist over the outer waters, along with a couple small long period swells from both from the nw and s.


7 Day Forecast for Marine Location Near Manila, CA
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location: 40.83, -124.16     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 092217 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 317 PM PDT Thu Apr 9 2020

SYNOPSIS. Dry weather is expected to prevail through most of next week as an upper ridge dominates. Temperatures will generally remain above normal in the interior. Persistent marine air will bring periods of low cloudiness and onshore winds, keeping coastal areas cooler.

DISCUSSION. With an inverted surface trough shifting just offshore last night, deepening marine layer cloudiness flowed quickly northward to Crescent City by mid-morning today. With that, any hopes of another sunny and mild afternoon were dashed for most of our coastal locations. The lone exceptions are a few spots to the north of coastal headlands and mountainous terrain, such as Fortuna and Ferndale. Meanwhile, with a very deep marine layer intrusion across Mendocino County, cloudiness has been slow to break or scatter even around Ukiah, where temperatures have struggled to get into the 60s. Portions of the Klamath, Trinity, and upper Mad River valleys that were protected from the southerly flow of marine air have managed to rise into the 70s once again this afternoon.

Heading into tonight, we'll look for marine cloudiness to thicken and expand once again in those areas where cooler marine air intruded last night and today. The rest of the interior including most of Trinity County will remain clear. Expect the marine layer cloudiness to be quite deep; from 2000 to 3000 feet for Humboldt and Del Norte, but even up to 4000 feet across Mendocino and Lake counties. Combined with mid and upper-level ridging aloft, clouds will be slow to erode back toward the coast on Friday. As surface winds shift toward the northwest and onshore for the afternoon, we are thinking that only limited breaks of sun will be found along the coastal plain, outside of the Lost Coast area adjacent to the King Range around Shelter Cove. That said, most interior valleys including those across Mendocino and Lake Counties should see a fair amount of sun tomorrow and temps into the 60s, with even low to mid 70s along the Trinity River.

This weekend should bring a shallower marine layer, with stronger northwest winds pushing onshore and inland during the afternoons and evenings, which should promote more widespread afternoon clearing of the marine stratus and fog. Otherwise, strong upper- level high pressure locked in place across the eastern Pacific will effectively block Pacific moisture and any storm systems from threatening our area through next week. Some upper- level troughs rounding the top of the ridge and diving across the northern Rockies could possibly clip our area at times over the next 7 days. It is not outside of the realm of possibility that one of these may trigger a couple stray interior mountain showers, perhaps specifically on Sunday afternoon, but at this point the chance looks low enough to leave out of the forecast. With that, expect dry conditions, with seasonable coastal temperatures and inland temperatures mainly staying well above seasonal averages for the weekend into next week. /AAD

AVIATION. A rather complex cloud pattern exists across the area this afternoon. Southerly cloud-level flow continues to push low- level moisture and stratus into the coast from Cape Mendocino northward. There are some breaks in this cloudiness along portions of the immediate coast, but moisture continues to pile up on the windward side of the coastal terrain. Per coastal profiler data, the marine layer appears to be about 3500 feet deep at ACV and 5000 feet deep S of the area at Bodega Bay. Models indicate that the marine layer will continue to deepen along the Redwood Coast to 5000 feet later tonight and on Friday before dropping back closer to 3000 feet on Saturday. Expect clouds to lower at both KACV and KCEC through the evening hours with the chance of visibility reductions later in the forecast period. Ceilings may once again hold in for the day on Friday with slowly rising ceiling heights. Winds will be generally light, with some gusts to around 15 kt at KCEC into the evening hours.

At KUKI, ceilings have risen to over 4000 ft, but skies remain broken to overcast. Expect ceilings to drop back to MVFR levels later tonight. No significant visibility reductions are anticipated at this time. Southerly winds will gust to 15 to 20 kt through the early evening hours. /SEC

MARINE. The interior thermal trough has pushed W a little closer to the coast today and disrupted the surface pressure gradient. This has induced a brief weakening trend in the persistent northerly wind regime which has dominated the past several days. A Small Craft Advisory continues across the outer waters. The S advisory will end at 6 PM, while the N advisory is expected to expire Friday morning. The lull in the northerlies will be short-lived as the coastal gradient tightens again and northerlies re-intensify from late Friday afternoon into the weekend. /CB&SEC

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until noon PDT Friday for PZZ470.

Small Craft Advisory until 6 PM PDT this evening for PZZ475.



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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 5 mi75 min 51°F1017.8 hPa
NJLC1 6 mi105 min WSW 25 G 29 53°F
46244 - Humboldt Bay, North Spit, CA 11 mi75 min 52°F8 ft
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 21 mi65 min SSW 14 G 18 53°F 50°F
46213 - Cape Mendocino, CA (094) 48 mi75 min 53°F6 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, CA12 mi52 minSW 610.00 miOvercast55°F48°F80%1018.5 hPa
Fortuna Rohnerville Airport, CA19 mi50 minN 1510.00 miA Few Clouds61°F51°F72%1016.6 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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Last 24hrNW6W55S6SE6SE5SE4SE4E4SE3E4E3CalmE3E3CalmS5SE3S6SW9W5CalmSW6SW6
1 day agoSW4W6W5W5NW5NW3W3W4SE3S4S5CalmN5NE4CalmS3NE3S3NW6W6NW5W6SW6S7
2 days agoN16
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NW13N11N7CalmE3CalmE3CalmSE4E4E5E4E3E4NE4E3NW3W7W8NW743

Tide / Current Tables for Samoa, Humboldt Bay, California
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Samoa
Click for Map
Thu -- 01:33 AM PDT     8.22 feet High Tide
Thu -- 06:46 AM PDT     Sunrise
Thu -- 07:50 AM PDT     -0.67 feet Low Tide
Thu -- 08:03 AM PDT     Moonset
Thu -- 02:22 PM PDT     7.01 feet High Tide
Thu -- 07:50 PM PDT     1.22 feet Low Tide
Thu -- 07:50 PM PDT     Sunset
Thu -- 10:10 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.28.18.17.25.43.21.1-0.3-0.7-01.33.14.96.376.85.94.32.71.61.21.83.14.8

Tide / Current Tables for Humboldt Bay Entrance, California
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Humboldt Bay Entrance
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Thu -- 01:05 AM PDT     7.12 feet High Tide
Thu -- 06:46 AM PDT     Sunrise
Thu -- 07:50 AM PDT     -0.67 feet Low Tide
Thu -- 08:04 AM PDT     Moonset
Thu -- 01:54 PM PDT     5.91 feet High Tide
Thu -- 07:50 PM PDT     1.22 feet Low Tide
Thu -- 07:50 PM PDT     Sunset
Thu -- 10:11 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.67.16.85.74.12.30.7-0.4-0.7-01.334.55.65.95.54.63.52.31.51.21.834.6

Weather Map
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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 (18,4,5,8)
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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.