Monday, June21, 2021
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Marine Weather and Tides
Alderpoint, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:43AMSunset 8:52PM Sunday June 20, 2021 11:47 PM PDT (06:47 UTC) Moonrise 3:17PMMoonset 1:44AM Illumination 86% Phase: Waxing Gibbous; Moon at 11 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- 830 Pm Pdt Sun Jun 20 2021
Tonight..S winds 5 to 10 kt. Waves nw 7 ft at 10 seconds... And S 2 ft at 17 seconds. Areas of fog.
Mon..SE winds 5 to 10 kt. Waves nw 6 ft at 9 seconds...and S 2 ft at 16 seconds. Patchy fog.
Mon night..SE winds 5 kt...becoming ne. Waves nw 5 ft at 9 seconds...and S 3 ft at 18 seconds. Patchy fog.
Tue..NW winds 5 kt. Waves nw 5 ft at 10 seconds...and S 3 ft at 18 seconds.
Tue night..NW winds 5 to 10 kt. Waves nw 5 ft at 11 seconds... And S 3 ft at 17 seconds.
Wed..NW winds 5 to 10 kt. Waves nw 5 ft at 10 seconds...and S 3 ft at 16 seconds.
Thu..NW winds 5 to 15 kt. Waves nw 6 ft at 8 seconds...and S 2 ft at 15 seconds.
Fri..W winds 5 to 10 kt. Waves N 5 ft at 10 seconds.
PZZ400 830 Pm Pdt Sun Jun 20 2021
Synopsis for northern california waters..Winds and seas will gradually diminish as a trough approaches the region. Seas will subside across the outer waters into Monday morning. Relatively calm conditions are expected Monday through Tuesday, followed by increasing northerly winds on Wednesday.


7 Day Forecast for Marine Location Near Alderpoint, CA
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location: 40.06, -123.52     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 202201 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 301 PM PDT Sun Jun 20 2021

SYNOPSIS. A cooling trend is expected early to mid next week as an upper level low approaches the area. This low will also bring a slight chance of dry thunderstorms Monday evening to the far northeastern mountains of Trinity and Del Norte Counties. Slightly better chances for interior storms are expected Tuesday and especially Wednesday.

DISCUSSION. Hot weather conditions continued across the interior again today. As of 2 PM, temperatures have been trending downward across much of Lake and interior Mendocino Counties. Temperatures have been running about the same to warmer in Trinity, interior Del Norte and interior northeast Humbodlt Counties. The heat risk is moderate with localized areas of high risk today. With the heat waning this evening, will end the heat advisory for the interior. High temperatures will continue to trend downward early to mid week as an upper level low slowly approaches Monday through Tuesday. In addition to the synoptic scale cooling, a deeper marine layer and onshore breezes will aid in the downward trend in temperatures for interior locations.

The offshore low will likely stall offshore on Tuesday and then slowly meander southward or southwestward through the end of the week. Interior thunderstorms will be possible as the flow aloft becomes southeast on Monday. Soundings are not looking very favorable for storms on Monday with high values of convective inhibition. Convective allowing models as well as SREF calibrated thunderstorm probabilities indicate best chances just north of the forecast area. A few lightning strikes will be possible near the border of Siskiyou county, however confidence in even isolated strikes is low.

Chances for storms will increase on Tue and Wed as PWATS, CAPE and instability increases. The greatest threat will be over the interior, likely triggered by the daytime ground heating. The latest GFS and ECMWF indicates southeasterly flow aloft developing on Wed, with convection possibly developing farther west out toward the coast. Soundings show a decoupled atmosphere, with a well defined marine layer over coastal areas. Soundings do show weak elevated CAPE, around 50-100j/kg, but the parcels will need to be lifted from 10-15kft. The marine environment will be very unfavorable for interior storms to propagate out over the coast and coastal waters. Thus, for now will add a mention of showers considering that the GFS has some convective precip by early Wed evening. High resolution model guidance, such as the HREF and HRRR, should shed more light on this in the next couple of days.

The cut-off low will meander around offshore the California coast through the rest of week. Trend has been for the cut-off low to drift southward offshore the Central California Coast Thu/Fri as a ridge folds over into the Pacific NW. This large scale pattern should promote warming across the region, with interior high temperatures potentially soaring back to 100-108F degrees as we head into next weekend. It is possible for wrap around moisture and convection to spread back over the southern/eastern portions of the forecast area Thu and Fri. The threat for storms could even linger over the weekend if the cut-off drifts back north. WPC 500mb ensemble clusters certainly support this possibility of northward cut-off low drift. The cut-off will most likely drift southwestward away from the area allowing the ridge to come in full force. This latter scenario appears more likely given the strength of the downstream ridge.

AVIATION. A southerly surge moving up the coast has reached the southern OR coast early this afternoon. The KACV profiler now indicates the marine layer is 2000+ feet deep this afternoon. Southerly winds have now developed along both the Mendocino and Redwood Coasts, as marine stratus and fog continues advecting north over coastal waters as expected. At this point, IFR conditions prevail at KCEC while stratus at KACV has burned off to the beach bringing VFR conditions. The VFR conditions at KACV are expected to be short lived as an onshore wind developing breezy west-southwest this afternoon will bring the marine stratus back over KACV. This will lead to IFR conditions at KACV.

Meanwhile, VFR conditions persist at UKI with breezy southerly winds developing once again this afternoon lasting into evening. The deepening marine layer is expected through Monday morning and this will bring IFR to LIFR conditions at both KCEC and KACV. mkn

MARINE. Northerly winds continue to gradually diminish tonight into Monday as a trough approaches the region. A reversal of the wind to southerly has developed along the North Coast in response and will continue to spread to the north through Monday. Seas are subsiding as the northerly wind decreases. There is also a 2 feet long period southerly swell that is moving through the waters. This is expected to build to 3 feet into Tuesday and last through the end of the week.

Monday as the upper low moves through and winds will diminish even more. Relative light winds will develop across all waters to allow short period waves to diminish. Tuesday afternoon winds are expected to become northerly and increase again by Wednesday as the system moves out of the area. Late in the week and into the weekend high pressure is expected to build back in and strengthen the northerly winds once again. mkn

FIRE WEATHER. The threat remains for isolated dry thunderstorms Monday evening in response to a potent vorticity maximum lifting N across Trinity County and some elevated instability. The threat for wetter isolated storms will increase Tuesday and Wednesday, during the afternoons. Lightning activity is expected to be isolated at this time, so we will continue to use headlines in the planning forecast to call attention to the possibility.

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 9 PM PDT this evening for PZZ450.

Small Craft Advisory until 3 PM PDT Monday for PZZ470.

Small Craft Advisory until 3 AM PDT Monday for PZZ475.



Visit us at https://www.weather.gov/eureka

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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 61 mi71 min 53°F1012.6 hPa
46014 - PT ARENA - 19NM North of Point Arena, CA 62 mi37 min S 3.9 G 5.8 53°F 53°F1013.1 hPa53°F

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fortuna Rohnerville Airport, CA47 mi62 minN 00.15 miOvercast50°F50°F100%1012.2 hPa

Link to 5 minute data for KFOT

Wind History from FOT (wind in knots)
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmNW3NW5NW8W9NW11
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Tide / Current Tables for Shelter Cove, California
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Shelter Cove
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Mon -- 03:07 AM PDT     -0.06 feet Low Tide
Mon -- 03:16 AM PDT     Moonset
Mon -- 05:47 AM PDT     Sunrise
Mon -- 09:30 AM PDT     4.31 feet High Tide
Mon -- 02:32 PM PDT     2.04 feet Low Tide
Mon -- 05:35 PM PDT     Moonrise
Mon -- 08:46 PM PDT     6.79 feet High Tide
Mon -- 08:48 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.61.20.3-0.10.20.91.92.93.74.24.33.93.22.52.12.12.73.64.85.86.66.86.35.2

Tide / Current Tables for Westport, California
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Westport
Click for Map
Mon -- 03:02 AM PDT     -0.16 feet Low Tide
Mon -- 03:15 AM PDT     Moonset
Mon -- 05:47 AM PDT     Sunrise
Mon -- 09:38 AM PDT     4.01 feet High Tide
Mon -- 02:27 PM PDT     1.94 feet Low Tide
Mon -- 05:33 PM PDT     Moonrise
Mon -- 08:46 PM PDT     Sunset
Mon -- 08:54 PM PDT     6.49 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.41.10.2-0.20.10.81.72.63.43.943.632.4222.53.44.55.56.26.56.15.1

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GEOS Local Image of CentralWestCoast    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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