Marine Weather Net

Cape Mendocino to Point Arena CA from 10 NM to 60 NM Marine Forecast


20 - 30


25 - 30


25 - 30


25 - 30

The Marine Weather Forecast In Detail:
PZZ475 Forecast Issued: 248 PM PDT Tue May 30 2023

Tonight...N Winds 20 To 30 Kt. Waves N 10 Ft At 9 Seconds...And Nw 5 Ft At 12 Seconds.
Wed...N Winds 25 To 30 Kt With Gusts To Around 40 Kt. Waves N 12 Ft At 10 Seconds...And Nw 5 Ft At 14 Seconds.
Wed Night...N Winds 25 To 30 Kt With Gusts To Around 40 Kt. Waves N 13 Ft At 10 Seconds...And Nw 4 Ft At 13 Seconds.
Thu...N Winds 25 To 30 Kt. Waves N 13 Ft At 10 Seconds...And Nw 3 Ft At 12 Seconds.
Thu Night...N Winds 25 To 30 Kt. Waves N 11 Ft At 10 Seconds...And Nw 3 Ft At 11 Seconds.
Fri...N Winds 20 To 30 Kt. Waves N 11 Ft At 9 Seconds...And Nw 3 Ft At 11 Seconds.
Sat...N Winds 25 To 30 Kt. Waves N 10 Ft At 9 Seconds...And Nw 4 Ft At 12 Seconds.
Sun...N Winds 20 To 30 Kt. Waves N 13 Ft At 10 Seconds...And Sw 8 Ft At 16 Seconds.
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Area Forecast Discussion
National Weather Service Eureka CA
254pm PDT Tuesday May 30 2023

Murky weather has persisted despite a lifting marine layer along the coast with nearly stationary pulse thunderstorms along the rim of the Sacramento Valley this afternoon. The marine layer is expected gradually shallow and better clear late this week as interior temperatures warm.

Low pressure moving further to the south has shift wind to the southeast. This influence is battling an upper level trough pushing air from the northwest. This, along with lingering instability and moisture, has yielded nearly stationary pulse thunderstorms his afternoon. These storms are overall pretty minor, but trier stationary nature will increase the risk of localized flooding. For example, some back building storms have been stuck along eastern Highway 36 this afternoon, dropping between 0.4 to 0.8 inches of rain according to radar estimates (which are most likely overestimated due to dry air entrainment, the Yolla Bolly station in the area only shows 0.35 inches).

Heading into Wednesday and Thursday, an approaching trough will once again increase instability while turning winds back onshore. Though weakening moisture profiles with PWAT (Precipitable Water) around 0.5 inches drops the NBM chances of thunder below 10% for everyone except the far northeastern corner of Trinity County. Closer to shore, stronger afternoon onshore wind will help push cooler marine air and stratus further up the Eel river valley while limiting its relative extent up the Russian river. The strongest sea breezes are expected Wednesday and Thursday afternoons with NBM showing a 50% chance or more of gusts over 30 mph along the immediate coast. While nighttime stratus will remain extensive, more instability aloft will aid in afternoon clearing compared to today. That said, coastal highs will remain cool, struggling to hit 60 thanks to ocean cooling.

High pressure building later in week will finally bring hotter weather to the interior. NBM has a 70 to 80% chance of interior valleys reaching back near 90 by Saturday. High pressure will shallow the marine layer while maintaining enhanced onshore breezes. Such a setup will increase the marine stratus exposure to local terrain effects and mixing, setting up a pattern of regular afternoon clearing. Indeed, NBM seems to reflect this, increasing coastal highs into the mid 60s this weekend with less cloud cover. In the extended forecast, about 70% of cluster ensemble members bring defined low pressure off the southern California coast. Such as setup would bring a pulse of moisture to the area. Depending on the strength of the pulse, another round of showers and thunderstorms can be expected next week. PWATs (Precipitable Waters) return to over 1.0 inches by Monday according to the deterministic GFS. Interestingly he moisture seems to generate right central and northern California without a clear source region. /JHW

A trend of increasing northerly winds is underway. Advisory level seas and winds remain in the outer waters, and will spread to the inner zones this evening. Gale force gusts will develop in the outer zones by early Wednesday morning. Gale strength gusts to around 40 kts will expand into portions of Northern Inner zone and the majority of the Southern Inner zone by Wednesday afternoon. Gale Watches have been hoisted. Steep, hazardous seas up to 13 will be generated from these winds, and will slowly subside Thursday night and into Friday as the northerlies ease somewhat. The northerlies will strengthen again through the weekend.

.EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 9pm this evening to 5pm PDT Thursday for PZZ450.

Small Craft Advisory from 9pm this evening to 3pm PDT Wednesday for PZZ455.

Gale Warning from 3pm to 10pm PDT Wednesday for PZZ455.

Small Craft Advisory until 5am PDT Wednesday for PZZ470- 475.

Gale Warning from 5am Wednesday to 5pm PDT Thursday for PZZ470-475.