Cape Mendocino to Point Arena CA from 10 NM to 60 NM Marine Forecast
| Today...N Wind 15 To 20 Kt, Becoming Nw 20 To 25 Kt This Afternoon. Seas 7 Ft. Wave Detail: Nw 7 Ft At 11 Seconds And Sw 2 Ft At 15 Seconds. A Chance Of Rain. |
| Tonight...Nw Wind 25 Kt With Gusts Up To 35 Kt. Seas Around 9 Ft. Wave Detail: Nw 9 Ft At 9 Seconds And S 2 Ft At 19 Seconds. |
| Sun...Nw Wind 20 To 25 Kt With Gusts Up To 35 Kt. Seas 10 Ft. Wave Detail: Nw 10 Ft At 9 Seconds And S 2 Ft At 18 Seconds. |
| Sun Night...N Wind 20 To 25 Kt. Seas 9 Ft. Wave Detail: Nw 9 Ft At 8 Seconds And Nw 2 Ft At 16 Seconds. |
| Mon...N Wind 20 To 25 Kt. Seas 10 Ft. Wave Detail: Nw 9 Ft At 8 Seconds And Nw 2 Ft At 15 Seconds. |
| Mon Night...N Wind 20 To 25 Kt With Gusts Up To 35 Kt. Seas Around 10 Ft. Wave Detail: Nw 10 Ft At 8 Seconds And Nw 2 Ft At 14 Seconds. |
| Tue...N Wind 20 To 25 Kt. Seas 10 Ft. Wave Detail: N 10 Ft At 8 Seconds And Nw 2 Ft At 13 Seconds. |
| Tue Night...N Wind 20 To 25 Kt. Seas 9 Ft. Wave Detail: Nw 9 Ft At 7 Seconds And Nw 4 Ft At 12 Seconds. |
| Wed...N Wind 20 To 25 Kt. Seas 9 Ft. Wave Detail: N 8 Ft At 7 Seconds And Nw 5 Ft At 11 Seconds. |
| Wed Night...N Wind 20 To 25 Kt. Seas 8 Ft. Wave Detail: N 7 Ft At 7 Seconds And W 4 Ft At 11 Seconds. |
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Area Forecast Discussion National Weather Service Eureka CA 514am PDT Sat April 26 2025 Synopsis Showers activity continues through the day, tapering off by Sunday afternoon. Breezy northwest winds will develop along the coast and exposed ridges through Sunday. A dry warming trend is expected Sunday through mid next week. As the low becomes a bit more organized about its rotational mass, making its way to the central CA coastline, the PACNW is receiving the top of the ccw easterly meridional flow aloft-delivering moisture in the form of clouds and precipitating into showers. Despite cold air advecting into the area, the clouds will limit the overnight minimum temps. Along with moisture and cloud cover, the likelihood of frost is low Saturday morning. HREF is showing quite a bit of clearing Sunday which could introduce the need for a frost product for overnight lows into Monday morning. Eastern Humboldt and Trinity county are forecast for 33-36F in elevations below 3000ft, along hwy 36 east of Bridgeville and hwy 3 up to Lewiston as well as central Mendocino north of Willits-Sunday late night into Monday before dawn. Otherwise, showers will continue across the northern half of the CWA (County Warning Area) and expand southward toward Mendocino and Lake county by the afternoon today. Rain rates will be moderate with precipitation continuing through to Sunday morning, tapering off as the low proceeds on a southeast trajectory. High temperatures are forecasted to be 5 to 15 degrees below normal today. ECMWF (European Centre for Medium-Range Weather Forecasts) Extreme Forecast Index (EFI) is signaling highs in the 60th-80th percentile with below normal temperatures for the interior areas in southern Humboldt, interior Mendocino and Lake County. Overnight temperatures are expected to remain in the 40s across the valleys due to lingering low level moisture. Breezy northwest winds will developed along the coast this afternoon through Sunday as surface high pressure begins to build, tightening the pressure gradient. Gusts from 25 to 35 mph are forecast for the coastal headlands and exposed ridges, with the strongest winds over the more prominent exposed terrain. HREF probabilities indicates there is a 50 to 75% chance of wind gusts greater than 30 mph for the North Coast this evening, then increasing chances up to 50% across the Mendocino Coast late tonight. Sunday, clearing skies are expected and temperatures will start to warm back up again as high pressure begins to build downstream, in the wake of the trough. Inland areas are expected to see highs in the 60s. Areas with valley fog are expected to develop Sunday night into Monday. High pressure continues to build in through the week with highs around 80 for the inland areas by Wednesday. Ensemble clusters and deterministic models show the high pressure shifting eastward on Thursday. Most of the cluster members (78%) suggest an upper level trough approaching the area next Friday. However, uncertainties exist with the positioning of the low and whether or not this will impact our CWA. /ZVS /EYS Marine Light NW winds continue tonight and will gain strength through the day. Waves are forecasted to build to 9-10 feet or so in the next 24 hours as winds build. These deteriorated marine conditions are forecasted through the weekend and remain hazardous into early next week. On Synoptic scale, a weak surface low pressure center off the Central California coast is moving east-southeastward through the weekend. Surface high pressure will build toward the Pacific NW Saturday afternoon resulting in a tighter pressure gradient over NW CA coastal waters causing an increase in northerly winds. These winds will build to near gale force gusts over much of the coastal waters with localized areas forecasted to reach gale force this afternoon south of Pt. St. George. Wind waves will build to 9-10ft @ 9 seconds through the evening. This is close to the threshold for a hazardous seas warning for primarily the outer waters (10 to 60NM from shore) into Sunday morning, however, a small craft advisory has been issued through the weekend. Winds will remain elevated with near gale gusts expected into the coming work week. .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 3pm this afternoon to 9am PDT Monday for PZZ450-455-470-475. |
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