Marine Weather Net

Cape Mendocino to Point Arena CA out 10 NM Marine Forecast


10 - 20


5 - 10


5 - 10


5 - 15

The Marine Weather Forecast In Detail:
PZZ455 Forecast Issued: 235 PM PDT Mon Sep 25 2023

Tonight...Se Winds 10 To 20 Kt...Easing To 5 To 10 Kt. Waves W 17 Ft At 14 Seconds. Rain And Chance Of Showers.
Tue...S Winds 5 To 10 Kt. Waves W 15 Ft At 15 Seconds. Slight Chance Of Showers.
Tue Night...Ne Winds 5 To 10 Kt. Waves W 14 Ft At 15 Seconds. Slight Chance Of Showers.
Wed...N Winds 5 To 15 Kt. Waves Nw 9 Ft At 13 Seconds.
Wed Night...N Winds 15 To 25 Kt. Waves Nw 9 Ft At 11 Seconds.
Thu...Nw Winds 20 To 30 Kt. Waves Nw 10 Ft At 8 Seconds.
Fri...Nw Winds 15 To 25 Kt. Waves Nw 10 Ft At 11 Seconds.
Sat...N Winds 15 To 25 Kt. Waves N 8 Ft At 8 Seconds.
SHARE THIS PAGE:           
Area Forecast Discussion
National Weather Service Eureka CA
200pm PDT Monday September 25 2023

Moderate to heavy rainfall will impact the Redwood Coast as well as portions of Trinity and northern Mendocino County through this evening. In addition, periods of breezy south winds will occur across exposed ridges and coastal headlands. Showers are then expected through mid week, followed by drier weather during Thursday.

A frontal precipitation band oriented SSW-NNE was moving onshore across NWRN CA this afternoon. IVT values in excess of 500 kg/m/s combined with a slow eastward frontal progression will favor locally heavy rainfall (with rainfall rates up to 0.5 in/hr) over southwest facing terrain across interior Del Norte, Humboldt, Trinity, and NRN Mendocino County through part of the evening. Rainfall will transition to lighter showery activity behind the passing front. In addition, post-frontal showers are not expected to evolve into thunderstorms due to CAPE profiles residing below the -20C level.

Isolated to scattered showers are forecast to occur during Tuesday, and those will be followed by a slightly more organized frontal precipitation event entering NWRN CA during Wednesday morning. Heaviest rainfall totals up to a half inch will likely occur across Del Norte County, with much lighter amounts near zero inch expected in Lake and southern Mendocino County. Multi-model guidance then shows a drier weather pattern developing across the region on Thursday that evolves into an upper trough amplifying significantly over the Intermountain West Friday and Saturday. The bulk of the precipitation with that trough is forecast to occur east of the EKA CWA, with dry breezy north-northeast winds potentially developing over NWRN CA instead.

Southerly winds are quickly easing over the waters this afternoon behind the passing of a front. A large 15 second westerly swell in filling in, and this will solidly maintain Small Craft Advisory condition through Wednesday afternoon when seas are forecast to drop below 10 feet. The swell will peak around 14 to 16 feet early Tuesday morning through Tuesday afternoon. See the Beach Hazards Statement below. A second and much weaker front will move through Tuesday night. This will bring a brief uptick in southerly winds up to 20 kt, mainly focused over the N outer zone 470. Northerly winds will trend up in the S zones late Wednesday, with expansion in all zones Friday and into the weekend. An isolated area of gale strength gusts will develop around Cape Mendocino late Wednesday through Thursday.

Storm total rainfall from 1 to 3 inches is forecast to occur across Del Norte County through late evening, with lower 1-2 inch totals over Humboldt and Del Norte Counties, 0.25-1.0 inch in Mendocino County, and less than 0.5 inch in Lake County. Minor urban and small stream flood potential will persist across Del Norte and Humboldt County going into the evening. In addition, a slight risk of debris flows will exist across area burns scars in Del Norte, Humboldt, and northern Trinity Counties.

.BEACH HAZARDS...A large mid-period westerly swell around 14 to 16 feet is expected to spread across the waters this afternoon into Tuesday, with breaking waves of 19 to 21 feet developing along west-northwest facing beaches. A high surf advisory has subsequently been issued valid 2am to 11am Tuesday due to the early season nature of this potentially hazardous breaking wave event.

.EKA WATCHES/WARNINGS/ADVISORIES... CA... Flood Watch until 11pm PDT this evening for CAZ101-102- 104>106.

High Surf Advisory from 2am to 11am PDT Tuesday for CAZ101-103-104.

Wind Advisory until 1pm PDT this afternoon for CAZ104>108.

NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 4pm PDT Wednesday for PZZ450- 455.

Gale Warning until 2pm PDT this afternoon for PZZ470-475.