Cape Mendocino to Point Arena CA out 10 NM Marine Forecast
| Rest Of Today...Nw Wind 10 To 15 Kt. Seas 7 Ft. Wave Detail: Nw 7 Ft At 8 Seconds And Sw 2 Ft At 15 Seconds. Patchy Dense Fog. A Slight Chance Of Rain. |
| Tonight...Nw Wind 10 To 15 Kt. Seas 5 Ft. Wave Detail: Nw 5 Ft At 8 Seconds And Sw 2 Ft At 15 Seconds. |
| Fri...Nw Wind 5 To 10 Kt. Seas 4 Ft. Wave Detail: Nw 4 Ft At 7 Seconds And Sw 2 Ft At 15 Seconds. Patchy Dense Fog. |
| Fri Night...N Wind 5 To 10 Kt. Seas 4 Ft. Wave Detail: Nw 4 Ft At 7 Seconds And S 2 Ft At 16 Seconds. Patchy Fog. |
| Sat...Nw Wind 5 To 10 Kt. Seas 4 Ft. Wave Detail: Nw 4 Ft At 7 Seconds And S 3 Ft At 16 Seconds. Patchy Fog. |
| Sat Night...N Wind 5 To 10 Kt. Seas 4 Ft. Wave Detail: Nw 3 Ft At 7 Seconds And S 3 Ft At 17 Seconds. Patchy Fog. |
| Sun...Nw Wind 5 To 10 Kt. Seas 4 Ft. Wave Detail: Nw 3 Ft At 8 Seconds And S 3 Ft At 16 Seconds. Patchy Fog. |
| Sun Night...N Wind 5 To 10 Kt. Seas 4 Ft. Wave Detail: Nw 3 Ft At 8 Seconds And S 3 Ft At 15 Seconds. Patchy Fog. |
| Mon...Nw Wind 5 To 10 Kt. Seas 4 Ft. Wave Detail: Nw 3 Ft At 7 Seconds And Sw 3 Ft At 15 Seconds. Patchy Fog. |
| Mon Night...N Wind 10 To 15 Kt. Seas 4 Ft. Wave Detail: Nw 3 Ft At 7 Seconds And S 3 Ft At 14 Seconds. |
| Area Forecast Discussion National Weather Service Eureka CA 455am PDT Thu August 13 2026 /issued 250am PDT Thu August 13 2026/ KEY MESSAGES... * Cooler temperatures are likely late week into the weekend. * Smokey conditions likely from the MP18 Fire, focused in the Trinity River Valley and Trinity County. * Slight chance of interior thunderstorms today into Saturday. SYNOPSIS...Interior temperatures trend below normal to end the work week. Coastal areas continue to have overnight stratus with afternoon clearing chances and breezy northwest winds. There is a slight chance for dry thunderstorms each afternoon from today and into Saturday for the interior. Smoke from the MP 18 fire continues to impact air quality over Northern California, particularly in the interior valleys of Humboldt and Trinity counties. Depending on fire containment, expect a similar pattern to carry through the week. The low level inversion is showing signs of weakening as a synoptic trough pattern develops. This feature combined with some atmospheric instability will help clear out the smoke more efficiently over the coming afternoons. Upper level troughing will also result lower daytime temperatures for the interior. Temperatures will be below normals through the extended forecast. The marine layer is deepening and extending farther inland, and will be conducive to producing light drizzle over the coming days especially for communities directly on the coast. The broad troughing and embedded shortwave disturbances will also create low chances for rainshowers or perhaps thunderstorm activity through the end of the week. A weak surge of monsoon moisture associated with a shortwave disturbance may clip portions of the southern zones Thursday, but even the most aggressive models continue to keep the bulk of the moisture SE of Lake County at this time. However, dry lightning potential exists through Trinity County (5-10%), especially if the moisture flux ends up more north than the high resolution models are suggesting. A secondary wave will move NE over Northern California Friday into Saturday morning. This disturbance will carry higher instability and moisture (though still meager), giving a slightly higher chance for some thunderstorm activity. This is mainly expected in western Siskiyou County, but could impact portions of surrounding counties (5-10% over Trinty County northward through far eastern Del Norte County, and 10-15% over Siskiyou County and far northeast Del Norte). There would be a potential for nocturnal activity late Friday as well if storms occur at all. That said, this is still a very low confidence forecast; however, it will still be watched very closely due to historical poor model handling of the setup type and the impact even a little lightning would have regarding fire potential over the very dry vegetation. Smoke from the ongoing MP18 fire near Hoopa will likely dampen instability (CAPE) over the afternoon hours. Marine Strong northerlies with gale conditions continue in the outer waters. These winds are generated steep and hazardous seas up to 12 ft at 10 to 11 seconds. These larger seas travel into the inner waters creating steep waves and leading to a small craft advisory. This afternoon,northerly winds will drop below 25kts as troughing enters the region disrupting the surface pressure gradient between the sea and the land. The northerlies will drop even more substantially Friday and especially through the weekend as troughing continues to weaken the pressure gradient. Seas will lower into and through the weekend. Fire Weather A troughing pattern is taking effect over the west coast, leading to good recoveries and also increases chances for a deepened marine layer to infiltrate farther into the interior. Increased mixing with local and general winds will create continued afternoon gusts, especially for major valleys. A weak surge of monsoon moisture associated with a shortwave disturbance heading north up the Valley has the potential to interact the mountain creating localized afternoon storms. However, even the most aggressive models keep the bulk of moisture SE of Lake County at this time. That said it's crucial to pay attention for building clouds today as any storms could send wind gusts channeling through terrain impacting ongoing fire operations. This becomes especially if the moisture flux nudges northwest beyond what the higher resolution models are suggesting. A secondary shortwave will move NE over Northern California Friday into Saturday morning. This disturbance will carry higher instability and moisture (though still meager), leading to a slightly higher chance for some thunderstorm activity (5-10% over Trinty County northward through far eastern Del Norte County, and 15% over Siskiyou County and far northeast Del Norte). There would be a potential for nocturnal activity late Friday as well if storms occur at all. Storm movement Friday would be to the north/northeast around 20 mph. Smoke from the ongoing MP18 fire near Hoopa will likely dampen instability (CAPE) over the afternoon hours, further lowering confidence on thunderstorm coverage. .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 3pm PDT this afternoon for PZZ450-455. Gale Warning until 9am PDT this morning for PZZ470-475. For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png |
Eureka CA Radar
Pacific Southwest Radar