Cape Mendocino to Point Arena CA from 10 NM to 60 NM Marine Forecast
| Rest Of Tonight...N Wind 15 To 20 Kt. Seas 7 Ft. Wave Detail: Nw 7 Ft At 8 Seconds And S 4 Ft At 14 Seconds. |
| Mon...N Wind 15 To 20 Kt. Seas 7 Ft. Wave Detail: Nw 7 Ft At 7 Seconds And S 4 Ft At 14 Seconds. |
| Mon Night...N Wind 20 To 25 Kt. Seas 7 Ft. Wave Detail: Nw 7 Ft At 7 Seconds And S 5 Ft At 14 Seconds. |
| Tue...N Wind 15 To 20 Kt. Seas 7 Ft. Wave Detail: Nw 7 Ft At 8 Seconds And S 4 Ft At 13 Seconds. |
| Tue Night...N Wind 10 To 15 Kt. Seas 6 Ft. Wave Detail: Nw 5 Ft At 8 Seconds And S 4 Ft At 12 Seconds. |
| Wed...N Wind 5 To 10 Kt. Seas 6 Ft. Wave Detail: Nw 5 Ft At 8 Seconds And S 4 Ft At 11 Seconds. |
| Wed Night...N Wind 5 To 10 Kt. Seas 6 Ft. Wave Detail: Nw 5 Ft At 8 Seconds And S 3 Ft At 11 Seconds. |
| Thu...N Wind 10 To 15 Kt. Seas 6 Ft. Wave Detail: Nw 3 Ft At 7 Seconds And S 3 Ft At 12 Seconds. |
| Thu Night...N Wind 15 To 20 Kt. Seas 7 Ft. Wave Detail: N 4 Ft At 7 Seconds And S 4 Ft At 11 Seconds. |
| Fri...N Wind 20 Kt. Seas 7 Ft. Wave Detail: N 6 Ft At 7 Seconds And S 3 Ft At 9 Seconds. |
| Fri Night...N Wind 20 To 25 Kt. Seas 8 Ft. Wave Detail: N 7 Ft At 8 Seconds And S 2 Ft At 8 Seconds. |
| Area Forecast Discussion ...CORRECTED National Weather Service Eureka CA 247pm PDT Sunday September 6 2026 .KEY MESSAGES... * Convective potential remains low (up to 15% chance) and limited to northern Trinity and far interior Del Norte through early evening. * Expanding high pressure aloft and compressing marine air will drive a sharp warming trend Tuesday through Thursday, bringing increased HeatRisk potential and temperatures 10-15 degrees above early September normals across interior valleys. Synopsis An exiting mid-level disturbance moving into Siskiyou County is keeping isolated shower and thunderstorm chances near the Oregon border through this evening. Atmospheric high pressure centered over the Desert Southwest will build westward starting Monday, initiating a pronounced warming trend through mid-week. Offshore flow on Wednesday will clear coastal low clouds temporarily before marine air moderates conditions late in the week. Water vapor imagery shows a shortwave trough axis shifting east of the forecast area. Mid-level lapse rates around 7.5 C/km across northeastern Trinity and interior Del Norte are providing modest mid-level instability. The NBM maintains a low probability (under 15%) for rainfall up to 0.05 inches, with moderate west-southwesterly steering flow carrying isolated convective cores rapidly into adjacent forecast areas. As the trough exits tonight, upper-level heigheights build across northern California under the expanding ridge. Subsidence under the ridge will compress the coastal inversion while interior surface pressure falls steepen the zonal onshore pressure gradient between the eastern Pacific surface high and the interior thermal low. Inland valley maximum temperatures will rise into the 98 to 102 degree range Tuesday through Thursday. Following operational coordination with the Weather Prediction Center, interior maximum temperature grids for Tuesday through Thursday were lowered 3-5 degrees relative to raw NBM guidance to align with ensemble bias trends. By Wednesday, a thermal trough positioning near the coast turns low-level flow offshore, bringing an 80% probability of coastal highs exceeding 70 degrees around Humboldt Bay before the marine layer re-establishes late Thursday. Marine An offshore high-pressure system interacting with the coastal thermal low continues to drive northerly winds, strongest across the southern marine zones. For the Northern Inner Waters, north winds of 10 to 15 knots with gusts to 20 knots will persist through Monday. Combined seas will average 4 to 6 feet, composed of a dominant northwest wind wave of 4 feet at 8 seconds and a long-period southerly swell of 2 to 3 feet at 15 seconds. For the Northern Outer Waters, northerly winds will range from 15 to 20 knots. Wave steepness remains marginal with dominant periods around 9 seconds. This decision is deferred to the upcoming midnight shift as sea state criteria remain marginal. For the Southern Inner Waters, a Small Craft Advisory remains active through 5am Monday for north-northwest winds of 15 to 25 knots and wave heigheights of 6 to 8 feet at 8 seconds. For the Southern Outer Waters, a Small Craft Advisory continues through 5pm Monday for north winds of 20 to 25 knots, gusts to 30 knots, and steep seas of 7 to 9 feet at 9 seconds. Additionally, a south-southwest swell of 3 to 5 feet at 15-16 seconds from Hurricane Marie will decay across all waters through Monday night. A thermal trough positioning over the coastline Wednesday will briefly reduce wind speeds across all waters before northerly flow re-strengthens Thursday evening. .EKA WATCHES/WARNINGS/ADVISORIES... CA... Beach Hazards Statement through Monday evening for CAZ104- 109. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 5am PDT Monday for PZZ455. Small Craft Advisory until 5pm PDT Monday for PZZ475. For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png |
Eureka CA Radar
Pacific Southwest Radar