Cape Mendocino to Point Arena CA from 10 NM to 60 NM Marine Forecast
| Rest Of Today...Nw Wind 20 To 25 Kt. Gusts Up To 35 Kt This Afternoon. Seas 8 Ft. Wave Detail: Nw 8 Ft At 7 Seconds And S 3 Ft At 18 Seconds. |
| Tonight...Nw Wind 20 To 25 Kt With Gusts Up To 35 Kt. Seas Around 9 Ft. Wave Detail: N 9 Ft At 8 Seconds And S 3 Ft At 17 Seconds. |
| Thu...Nw Wind 25 To 30 Kt. Seas 10 Ft. Wave Detail: N 10 Ft At 9 Seconds And S 3 Ft At 17 Seconds. |
| Thu Night...N Wind 25 To 30 Kt With Gusts Up To 40 Kt. Seas Around 10 Ft. Wave Detail: Nw 10 Ft At 9 Seconds And Sw 3 Ft At 16 Seconds. |
| Fri...N Wind 20 To 25 Kt With Gusts Up To 35 Kt. Seas 9 Ft. Wave Detail: Nw 9 Ft At 8 Seconds And Sw 2 Ft At 16 Seconds. |
| Fri Night...N Wind 20 To 25 Kt. Seas 8 Ft. Wave Detail: Nw 8 Ft At 7 Seconds And Sw 2 Ft At 15 Seconds. |
| Sat...N Wind 20 To 25 Kt. Seas 7 Ft. Wave Detail: N 7 Ft At 7 Seconds And Sw 2 Ft At 15 Seconds. |
| Sat Night...N Wind 20 To 25 Kt. Seas 7 Ft. Wave Detail: Nw 7 Ft At 8 Seconds And S 2 Ft At 15 Seconds. |
| Sun...N Wind 20 To 25 Kt. Seas 8 Ft. Wave Detail: N 8 Ft At 8 Seconds And S 2 Ft At 15 Seconds. |
| Sun Night...N Wind 20 To 25 Kt. Seas 8 Ft. Wave Detail: N 8 Ft At 8 Seconds And S 2 Ft At 15 Seconds. |
| Area Forecast Discussion National Weather Service Eureka CA 1206am PDT Wednesday July 8 2026 KEY MESSAGES * Persistent Stratus: Seasonably cool conditions along the immediate coast will alternate with typical night and morning low clouds and fog. * Building Interior Heat: A robust ridge of high pressure will maximize temperature anomalies across all inland valleys, including Lake, Trinity, and interior Mendocino counties, starting late this week. Synopsis A strong surface high pressure system over the eastern Pacific interacting with an intense inland thermal trough will maintain a shallow marine layer along the coast, bringing overnight low clouds and localized dense fog. Inland areas will remain dry and hot under a building upper-level ridge. Triple- digit heat will become widespread across the interior valleys of Trinity, Mendocino, and Lake counties by Thursday. The 500 mb analysis shows a building upper-level ridge over the southwest U.S. extending into California. The persistent coastal marine layer is a result of a tight low-level onshore pressure gradient between the offshore marine high and the interior thermal low. Widespread IFR/LIFR ceilings and some visibility restrictions will impact coastal areas through the morning hours. Expect partial afternoon clearing along the immediate coast as daytime heating deepens the mixing layer slightly, though low stratus will return rapidly after sunset. Inland areas will experience significant heating as the upper ridge strengthens and moves westward. Subsidence will compress the marine layer, keeping it shallow and confined to the coast and immediate valleys. High temperatures on Wednesday will reach the 90s to near 100 degrees across the interior valleys of Trinity, Mendocino, and Lake counties. By Thursday, triple-digit heat will expand across all interior zones, with the highest values expected in the deepest valley floors. Marine The pressure gradient between the offshore high and the inland thermal low is tightening across the waters. Winds south of Cape Mendocino are sustained at 20 to 25 knots, producing steep, wind-driven seas that warrant a continuation of the Small Craft Advisory for the southern inner and southern outer waters. In the northern outer waters, wind speeds are modeled to increase to 20 to 25 knots with wave heigheights reaching 9 feet at a short 8- second dominant period late tonight. These waves will be steep and choppy. A Small Craft Advisory may be issued on this shift to address these conditions, or the decision may be deferred to the upcoming midnight shift to see if trends continue. Northern inner waters will remain comfortably below advisory thresholds. .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 3am PDT Friday for PZZ455-475. For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png |
Eureka CA Radar
Pacific Southwest Radar