Thursday, April22, 2021
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Marine Weather and Tides
Shelter Cove, CA

Version 3.4
NOTICE
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 6:24AMSunset 8:05PM Thursday April 22, 2021 7:15 PM PDT (02:15 UTC) Moonrise 1:58PMMoonset 3:22AM Illumination 85% 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- 254 Pm Pdt Thu Apr 22 2021
.small craft advisory in effect through Friday morning...
Tonight..NW winds 15 to 25 kt. Waves N 9 ft at 8 seconds. Patchy fog.
Fri..NW winds 10 to 20 kt. Waves N 7 ft at 7 seconds.
Fri night..W winds 5 to 15 kt. Waves N 5 ft at 7 seconds... And S 2 ft at 20 seconds. Slight chance of rain.
Sat..S winds 5 to 10 kt. Waves nw 4 ft at 10 seconds...and S 3 ft at 19 seconds.
Sat night..S winds 5 to 15 kt. Waves W 5 ft at 10 seconds... And S 3 ft at 18 seconds.
Sun..W winds 5 to 10 kt. Waves W 6 ft at 9 seconds...and S 3 ft at 17 seconds.
Mon..NW winds 5 to 10 kt. Waves W 5 ft at 10 seconds...and S 3 ft at 15 seconds.
Tue..NW winds 5 kt. Waves W 4 ft at 9 seconds...and S 2 ft at 15 seconds.
PZZ400 254 Pm Pdt Thu Apr 22 2021
Synopsis for northern california waters..As gale force winds ease hazardous seas follow, particularly in the southern outer waters. Fresh to strong north winds and steep seas will then prevail. Winds will become southerly by Saturday morning as a low pressure system approaches. Otherwise, a small westerly swell and a small southerly will impact portions of the waters this weekend.


7 Day Forecast for Marine Location Near Shelter Cove, CA
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location: 40.03, -124.07     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 222237 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 337 PM PDT Thu Apr 22 2021

SYNOPSIS. Interior northwest California will be dry and warm through Friday, while cooler marine air will linger near the coast. Progressively cooler and wetter weather is in store for the weekend, with widespread rain and high mountain snow expected Sunday.

DISCUSSION. A few patches of marine layer stratus have lingered into the mid afternoon hours around Humboldt Bay and the lower Eel River Delta, as well as along the southern Mendocino Coast. We'll look for low clouds to start filling back this evening as onshore breezes relax. Those northerly winds are not as strong as yesterday, but still are keeping coastal areas on the cool side. Meanwhile, sunny and warm conditions persist throughout interior northwest California, with high temperatures in the 70s to around 80 degrees in the warmest interior valley locations.

An upper-level ridge axis will cross the West Coast as it shifts eastward Friday, resulting in continued dry and stable conditions. Offshore surface high pressure will weaken on Friday, allowing the pressure gradient to relax, which will limit afternoon northerly breezes, along with diurnal mixing, particularly near the coast. That probably won't help our chances for sunshine along the coast, as marine layer stratus will be less apt to clear out, while high clouds advect in aloft in advance of our approaching storm system. It should remain mostly sunny and warm across the interior on Friday, but not quite as warm as Thursday, as mid-level temperatures begin to cool. The leading shortwave and surface cold front will quickly approach Friday evening, ahead of an upper- level low tracking southeastward from the Aleutians. Spotty light rain will overspread much of our region as a result on Friday night, with the best chances closer to the Oregon border. Occasional light rain will last into Saturday, with mostly cloudy skies and much cooler high temperatures. A more substantial shot of beneficial rain will arrive for Saturday night through Sunday with the aforementioned upper low. With progressively colder air aloft, atmospheric profiles will favor a transition to showery precipitation Sunday afternoon and evening. Have not added it to the forecast yet, but would not rule out small hail or thunder during that time. Low-level temperatures may limit any small hail showers from being too impactful. Meanwhile, snow levels lowering toward 4000 feet on Sunday will allow for some mountain snow, with significant accumulations and travel impacts likely for Scott Mountain Summit on Highway 3, while most of our other highway passes remain wet.

Some showers may linger into Monday as a trailing shortwave passes through, but otherwise expect a drying trend with moderating temperatures through mid-week. Ensemble guidance through next weekend shows a substantial amount of spread, so while the bulk of guidance keeps us fairly mild with limited rainfall, do not have much confidence in any more specifics beyond that. /AAD

AVIATION. Marine stratus and low clouds have receded off of the coastal terminals this afternoon, shifting flight categories from IFR to MVFR or better. Winds at CEC will be northerly and gusty through this evening, but not nearly as strong as yesterday. MVFR to IFR ceilings will return tonight, and linger much of Friday, while winds will tend light and southerly. Expect similar conditions for ACV, with VFR conditions lasting into this evening before marine stratus returns toward 06Z. Fog and low clouds did advect up the Russian river this morning to briefly hinder visibility at KUKI, which looks to happen again overnight into Friday morning as a southerly push appears to be in the guidance. VFR/MVFR at KUKI until late tonight or early Friday morning as Fog makes its way up the valley. /EYS

MARINE. Gale force winds have weakened although a Hazardous Seas Warning is in place for the southern outer waters as conditions remain elevated. Northerlies will continue to be rather strong, ranging from fresh to strong breezes over most of the coastal waters. N winds will be generally weaker nearshore and Small Craft Advisories have been hoisted to cover that hazard. Winds will become southerly by early Saturday morning as a low pressure system approaches. Latest guidance shows southerlies topping out as fresh breezes over the northern outer waters. The sea state will likely remain chaotic through the rest of today as winds slowly weaken and some steep, short-period seas linger. Otherwise, a small westerly swell and a small southerly swell will impact portions of the waters this weekend. /JAW /EYS

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 10 AM PDT Friday for PZZ450-455.

Small Craft Advisory until noon PDT Friday for PZZ470.

Hazardous Seas Warning until 6 PM PDT this evening for PZZ475.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46213 - Cape Mendocino, CA (094) 40 mi49 min 50°F7 ft
HBYC1 - 9418767 - North Spit, CA 52 mi39 min 53°F1016.8 hPa

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fortuna Rohnerville Airport, CA36 mi25 minWNW 12 G 167.00 miA Few Clouds50°F46°F88%1016.3 hPa

Link to 5 minute data for KFOT

Wind History from FOT (wind in knots)
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Tide / Current Tables for Shelter Cove, California
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Shelter Cove
Click for Map
Thu -- 02:12 AM PDT     2.62 feet Low Tide
Thu -- 04:22 AM PDT     Moonset
Thu -- 06:27 AM PDT     Sunrise
Thu -- 07:24 AM PDT     4.99 feet High Tide
Thu -- 02:22 PM PDT     0.14 feet Low Tide
Thu -- 02:57 PM PDT     Moonrise
Thu -- 08:02 PM PDT     Sunset
Thu -- 09:12 PM PDT     5.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.32.82.62.73.23.94.654.94.53.62.51.40.60.20.20.81.72.83.94.75.154.4

Tide / Current Tables for Punta Gorda, California Current
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Punta Gorda
Click for Map
Thu -- 03:12 AM PDT     0.00 knots Slack
Thu -- 04:23 AM PDT     Moonset
Thu -- 05:48 AM PDT     0.61 knots Max Flood
Thu -- 06:28 AM PDT     Sunrise
Thu -- 08:32 AM PDT     -0.00 knots Slack
Thu -- 11:40 AM PDT     -1.13 knots Max Ebb
Thu -- 02:58 PM PDT     Moonrise
Thu -- 03:31 PM PDT     0.00 knots Slack
Thu -- 06:36 PM PDT     1.02 knots Max Flood
Thu -- 08:03 PM PDT     Sunset
Thu -- 09:49 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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-0.6-0.5-0.4-0.10.30.50.60.50.2-0.2-0.7-1.1-1.1-0.9-0.7-0.30.20.7110.80.4-0.1-0.6

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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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