Marine Weather Net

Cape Mendocino to Point Arena CA out 10 NM Marine Forecast


5 - 15


15 - 25


20 - 30


10 - 15

The Marine Weather Forecast In Detail:
PZZ455 Forecast Issued: 231 PM PDT Mon Oct 18 2021

Tonight...Se Winds 5 To 15 Kt. Waves Nw 8 Ft At 12 Seconds.
Tue...Se Winds 15 To 25 Kt. Waves Nw 7 Ft At 11 Seconds. Chance Of Rain.
Tue Night...Se Winds 20 To 30 Kt With Gusts To 40 Kt. Waves S 8 Ft At 8 Seconds...And W 5 Ft At 13 Seconds. Rain And A Slight Chance Of Thunderstorms.
Wed...Se Winds 10 To 15 Kt. Waves Sw 10 Ft At 10 Seconds...And W 8 Ft At 14 Seconds. A Chance Of Showers And A Slight Chance Of Thunderstorms.
Wed Night...Se Winds 10 To 20 Kt. Waves W 12 Ft At 14 Seconds.
Thu...S Winds 10 To 20 Kt. Waves S 7 Ft At 9 Seconds...And W 8 Ft At 14 Seconds.
Fri...Sw Winds 5 To 10 Kt. Waves W 15 Ft At 15 Seconds.
Sat...S Winds 10 To 20 Kt. Waves W 11 Ft At 13 Seconds.
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Area Forecast Discussion
National Weather Service Eureka CA
256pm PDT Monday Oct 18 2021

Gusty south winds will develop Tuesday ahead of an approaching frontal system. Heavy rain will then spread across the region Tuesday night into Wednesday, with snow possible across the mountains of northern Trinity County. Otherwise, additional rainfall will be possible Thursday through Sunday.

An upper-level trough currently located over the NERN PAC is forecast to move east across the coast of the PACNW during Tuesday night. An associated surface front will subsequently advance across NWRN CA and aid in the development of moderate to heavy rain impacting coastal counties late Tuesday afternoon and evening, and then interior counties Tuesday evening into the night. A tight surface pressure gradient and southerly coastal barrier jet are forecast to occur ahead of the front Tuesday evening. Those features will favor gusts from 40 to 60 mph across exposed coastal areas and ridges, which supports issuance of a wind advisory. In addition, upslope southerly winds over northern Trinity County will aid in dynamically cooling the airmass over that region and lower snowlevels to around 4500-5500 ft MSL. Snow accumulations to 4 inches may impact travel at Scott Mountain Summit on Highway 3 Tuesday evening through Wednesday morning. Reference the latest winter weather advisory for additional information.

Post frontal showers occurring Wednesday midday are forecast to dissipate during the afternoon as midlevel heigheights begin to rise. Model guidance then shows low to midlevel warm air advection strengthening between an inland ridge and offshore trough Thursday morning, which will likely support prefrontal rainfall spreading north across the EKA CWA by noon Thursday. Frontal rains are then forecast to impact the region Thursday night and Friday morning, with additional frontal rainfall possible Saturday afternoon through Sunday. Current forecast guidance supports seven day rainfall totals ranging from near 4 inches in Lake County to over 10 inches along west facing mountain slopes and ridges. Flooding is not expected at this time, but rises on creeks, streams, and rivers will be likely. In addition, the risk for mountain rock/mud slides will increase due to the prolonged period of rainfall.


Southerly winds will increase this afternoon and evening ahead of an approaching front. Southerly gales are expected for the outer waters Tuesday afternoon into Wednesday morning. Storm force gusts are possible Tuesday night across portions of the northern outer waters. Southerlies will diminish on Wednesday, then increase again late Wednesday night and Thursday as yet another front approaches the area. Have made only very minor tweaks to the existing Small Craft Advisory and Gale Warning headlines. Later shifts will need to keep an eye on the wind forecast for the N waters as occasional gusts to storm force are already expected. Mid- period NW swells will continue.nue through Tuesday, with more westerly mid-period swells later in the week. /SEC

.EKA WATCHES/WARNINGS/ADVISORIES... CA... Wind Advisory from 5pm Tuesday to 2am PDT Wednesday for CAZ101>106.

Winter Weather Advisory from 8pm Tuesday to 11am PDT Wednesday for CAZ107.

NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 9am Tuesday to 9am PDT Wednesday for PZZ450-455.

Small Craft Advisory from 3am to noon PDT Tuesday for PZZ470.

Gale Warning from noon Tuesday to 3am PDT Wednesday for PZZ470.

Small Craft Advisory from 3am to 3pm PDT Tuesday for PZZ475.

Gale Warning from 3pm Tuesday to midnight PDT Tuesday night for PZZ475.