Wednesday, April21, 2021
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Marine Weather and Tides
Mendocino, 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 6:25AMSunset 7:57PM Wednesday April 21, 2021 4:08 AM PDT (11:08 UTC) Moonrise 12:49PMMoonset 2:44AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 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- 216 Am Pdt Wed Apr 21 2021
.hazardous seas warning in effect through this afternoon...
Today..NW winds 15 to 25 kt. Waves nw 11 ft at 10 seconds. Patchy fog.
Tonight..N winds 15 to 25 kt. Waves N 11 ft at 9 seconds... And nw 3 ft at 11 seconds.
Thu..NW winds 10 to 20 kt. Waves N 9 ft at 9 seconds.
Thu night..NW winds 15 to 25 kt. Waves N 8 ft at 8 seconds.
Fri..NW winds 10 to 15 kt. Waves N 6 ft at 8 seconds.
Sat..S winds 5 to 10 kt. Waves sw 3 ft at 5 seconds...and S 3 ft at 19 seconds.
Sun..SW winds 5 to 10 kt. Waves W 5 ft at 9 seconds...and S 3 ft at 17 seconds.
PZZ400 216 Am Pdt Wed Apr 21 2021
Synopsis for northern california waters..Gale force northerlies will continue across the outer waters and localized areas of the inner waters, with gusty north winds and steep seas persisting into Thursday morning. Winds will become southerly by midday on Saturday. Otherwise, a small northwest swell will slowly diminish through midday on Thursday.


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 211103 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 403 AM PDT Wed Apr 21 2021

SYNOPSIS. Dry and mild weather is forecast to occur across the interior through Friday, while cool and blustery weather is expected near the coast. After Friday, cooler conditions and widespread rain appears likely Saturday through Monday.

DISCUSSION. A vigorous upper low was moving southeast across the Sierra Nevada Mountains early this morning. Elsewhere, an upper ridge was positioned over the NERN PAC. Large-scale subsidence was occurring in between those two features over NWRN CA. Mainly clear skies were occurring as a result over the interior, while marine stratus was present over Humboldt Bay, the Eel River Valley, and portions of the Mendocino coast. A series of dry mild afternoons with highs in the 70s to low 80s is forecast to occur across the interior today through Friday. Meanwhile along the coast, cooler conditions are probable due to typical marine influences.

The previously mentioned ridge over the Pacific is forecast to breakdown Friday afternoon and night as an upper trough approaches from the west. Increasing ascent with the trough and PWAT values near 0.75 inch will favor rain spreading inland across locations mainly north of Cape Mendocino early Saturday morning. Thereafter, light rain will be possible in Mendocino and Lake Counties during late Saturday morning into the afternoon. This first round of weekend rainfall will feature totals ranging from less than a tenth of an inch south of Cape Mendocino to around a quarter inch in Del Norte county.

After Saturday, a stronger upper disturbance is forecast to approach coastal NWRN CA by 12Z Sunday, which will then move inland across NRN CA during Sunday afternoon. PWAT values will be slightly lower with the Sunday system, but stronger synoptic and orographic ascent will favor heavier rainfall totals near an inch over Del Norte county to around a quarter of an inch over Lake and southern Mendocino counties. In addition, midlevel temperatures are forecast to cool (at or below -8 C at 700 mb) Sunday afternoon and night. Accumulating snowfall will subsequently occur for elevations as low as 4500 feet. Impacts at Scott Mountain Summit on Highway 3 will be possible as a result.

Lingering shower activity is forecast to occur during Monday, followed by a period of drier conditions Monday night. Model spread increases Tuesday and Wednesday, but there is evidence that another precipitating storm system will impact the region by the middle of next week.

Garner

AVIATION. Mostly IFR to MVFR conditions are expected this morning along the coast, with MVFR to VFR conditions forecast to prevail this afternoon. Stratus is expected to return this evening in the vicinity of Humboldt Bay and possibly impact KACV starting late this evening. Statistical guidance also indicates some low clouds may impact KCEC again tonight. Another round of breezy winds are expected at both coastal terminals this afternoon, with gusts topping out around 30 mph or so at KCEC. Otherwise, VFR conditions should prevail at KUKI through the TAF period.

MARINE. Gales will persist over the outer and portions of the inner waters through today and start to ease tomorrow morning. Northerlies will then hover in the moderate to strong breeze range over the waters, with the weaker winds forecast near shore. Though, winds will remain stronger near Point Saint George and Cape Mendocino. Winds will start to shift to southerly late on Friday as a low pressure system approaches Northwest California this weekend. At this time, guidance is showing southerlies mostly in the moderate breeze range, but stay tuned. Seas will remain chaotic through Thursday given the combination of steep, short- period seas and a waning northwest swell. Buoy observations are showing hazardous seas criteria in both inner zones, so Hazardous Seas Warnings have been launched through 22Z and may need to be extended further. A westerly swell is forecast to move through the waters overnight on Friday and peak around 4 feet at 9 to 10 seconds. Otherwise, a longer period southerly swell will begin to impact portions of the waters overnight on Friday.

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Hazardous Seas Warning until 3 PM PDT this afternoon for PZZ450- 455.

Gale Warning until 3 AM PDT Thursday for PZZ470-475.



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

Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka

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 mi39 min 19 G 23 1011.1 hPa
ANVC1 - 9416841 - Arena Cove, CA 27 mi57 min WNW 5.1 G 8.9 48°F 1010.9 hPa

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA34 mi73 minN 010.00 miFair48°F43°F83%1010.2 hPa

Link to 5 minute data for KUKI

Wind History from UKI (wind in knots)
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4N8N9N8NE4CalmCalmCalmNW4CalmCalm
1 day agoCalmCalmCalmCalmCalmCalmNW125N8N7N6NW7
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmNW10NW11W12
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Tide / Current Tables for Mendocino, Mendocino Bay, California
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Mendocino
Click for Map
Wed -- 01:12 AM PDT     3.03 feet Low Tide
Wed -- 03:44 AM PDT     Moonset
Wed -- 06:12 AM PDT     4.59 feet High Tide
Wed -- 06:29 AM PDT     Sunrise
Wed -- 01:28 PM PDT     0.09 feet Low Tide
Wed -- 01:48 PM PDT     Moonrise
Wed -- 07:59 PM PDT     Sunset
Wed -- 08:42 PM PDT     4.52 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.233.13.43.94.34.64.543.22.21.30.50.10.10.61.32.23.13.94.44.54.23.7

Tide / Current Tables for Point Cabrillo, California Current
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Point Cabrillo
Click for Map
Wed -- 02:17 AM PDT     0.00 knots Slack
Wed -- 03:44 AM PDT     Moonset
Wed -- 04:44 AM PDT     0.44 knots Max Flood
Wed -- 06:29 AM PDT     Sunrise
Wed -- 07:21 AM PDT     -0.00 knots Slack
Wed -- 10:40 AM PDT     -1.04 knots Max Ebb
Wed -- 01:48 PM PDT     Moonrise
Wed -- 02:42 PM PDT     0.00 knots Slack
Wed -- 05:53 PM PDT     0.90 knots Max Flood
Wed -- 07:59 PM PDT     Sunset
Wed -- 09:09 PM PDT     -0.00 knots Slack
Wed -- 11:33 PM PDT     -0.65 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.3-0.10.20.40.40.30.1-0.2-0.7-1-1-0.9-0.6-0.30.10.60.80.90.80.50.1-0.4-0.6

Weather Map
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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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