Point St. George to Cape Mendocino CA from 10 to 60 NM Marine Forecast
| Today...S Wind 10 To 15 Kt, Rising To 15 To 20 Kt This Afternoon. Seas 10 Ft. Wave Detail: S 3 Ft At 4 Seconds And W 10 Ft At 12 Seconds. Rain. A Slight Chance Of Tstms This Afternoon. |
| Tonight...Sw Wind 20 To 25 Kt. Seas 10 Ft. Wave Detail: S 6 Ft At 6 Seconds And W 8 Ft At 12 Seconds. Rain. |
| Wed...N Wind 5 To 10 Kt. Seas 10 Ft. Wave Detail: Sw 3 Ft At 4 Seconds And Nw 7 Ft At 11 Seconds. |
| Wed Night...Se Wind 20 To 25 Kt. Seas 12 Ft. Wave Detail: W 11 Ft At 11 Seconds. Rain. |
| Thu...S Wind 25 To 30 Kt. Seas 11 Ft. Wave Detail: S 9 Ft At 7 Seconds And W 9 Ft At 11 Seconds. Rain. |
| Thu Night...S Wind 25 To 30 Kt With Gusts Up To 40 Kt. Seas Around 12 Ft. Wave Detail: S 9 Ft At 7 Seconds And W 9 Ft At 11 Seconds. Rain. |
| Fri...Sw Wind 25 To 30 Kt. Seas 12 Ft. Wave Detail: Sw 10 Ft At 8 Seconds And W 8 Ft At 11 Seconds. Rain. |
| Fri Night...Nw Wind 5 To 10 Kt. Seas 10 Ft. Wave Detail: Sw 6 Ft At 6 Seconds And W 9 Ft At 12 Seconds. Rain Likely. |
| Sat...Nw Wind 5 To 10 Kt. Seas 8 Ft. Wave Detail: Nw 8 Ft At 12 Seconds. Rain Likely. |
| Sat Night...Se Wind 5 To 10 Kt. Seas 7 Ft. Wave Detail: Nw 7 Ft At 11 Seconds. Rain Likely. |
| Area Forecast Discussion National Weather Service Eureka CA 136am PST Tuesday Dec 16 2025 Synopsis Light to moderate and locally heavy rain is forecast to continue through tonight for mostly Del Norte, Humboldt, Trinity and northern Mendocino Counties. A break in the rain is forecast on Wednesday, followed another high chance for heavy rain either on Thursday or Friday. Another chance for heavy rain and strong winds will arrive for the latter portion of the weekend. A quasi-stationary frontal system has developed over the northern portion of Northwest California overnight. Satellite and radar imagery depicts a secondary pulse of moisture extending westward and quickly approaching the area. Light to moderate rain continues moving onshore from west- southwest across the southern half portion of Humboldt, southern Trinity and far northern Mendocino counties. These showers are expected to increase in coverage and eventually become more widespread stratiform rain this morning with the WAA (Warm Air Advection - the movement of warm air) and moisture plume shifting southward. Localize heavy rainfall (rain rates > 0.25 in/hr) is expected over the southwest windward-facing terrain in Del Norte, Humboldt and southwest Trinity counties. Deeper moisture is expected to arrive this evening, enhancing the potential of heavier rainfall amounts. This will need to be watched for possible urban and small stream flooding and possible rock/mud slides. Additional rainfall of 1 to 2 inches is expected across much of the forecast area from 11 PM Monday to 4am Wednesday, with locally up to around 3.5 inches over the windward- facing terrain in Del Norte and Humboldt counties. Much lighter rain rates are expected for southern Mendocino and Lake Counties with storm total rain around 0.10 to 0.50 inches ending 4am Wednesday. Breezy to gusty southwest winds are expected develop this afternoon along the North Coast. Peak wind gusts at lower elevations will most likely be 20 to 35 mph, with locally up to 40 mph over the more prominent terrain in Del Norte County. Winds gusts will most likely be strongest this evening and tonight with the heavier rain. HREF mean suggest wind gusts increasing to around 30 to 40 mph in the lower elevation from 10PM to 3AM, with 50-75% chance of impactful gusts over 45 mph on high coastal ridges. ECMWF (European Centre for Medium-Range Weather Forecasts) ensemble indicates potential for strongest winds Thursday or Thursday night, though there continues to be large spreads. Above average warmth and fairly high snow levels will severely limit all prospects for significant snowfall except over the highest mountain peaks. There remains generally high confidence (80% chance) that a wet pattern will continue through the end of the week and into the weekend. GFS (Global Forecast System) and ECMWF continues to depict another moist plume impacting the northern most portion of the area on Thursday. Eventually this boundary moves across the area by Friday, though it could speed up or slow down. High pressure and generally drier conditions are expected for Saturday, however another storm in the line up will begin to spin up offshore and may begin to impact the area as early as Sat night or Sun. This low pressure system has the potential to generate strong and damaging winds as well as more heavy rain. Timing is still uncertain. Looking at the chance of IVT > 250 kg/m/s the following week Dec 22-26, confidence is moderate to high in wet weather continuing for latter portion of Dec. CPC's 8-14 day outlook also has NW CA in a high risk for heavy precipitation and a moderate risk for high winds. Stay tuned. /ZVS & DUG Marine Moderate southerly winds will generally weaken for much of Tuesday, but a mid period westerly swell building over 10 feet will maintain moderately steep seas at least for the the northern waters through most of the day. Another storm system will cross the area late Tuesday into early Wednesday. Southerly winds will again only briefly increase over 20 kts and will be mostly restricted to the northern waters. Calmer conditions will arrive again Wednesday afternoon though, once again, a mid period westerly swell up to 10 feet will likely maintain very moderately steep sea in the northern waters. A stronger storm system is expected around Friday. This storm will spread stronger south winds more into the southern waters with near gale gusts in the norther waters, though the potential for proper gales remains low (around 20 percent). A moderate mid period northwest swell will build behind this system with otherwise much more moderate conditions for the weekend. /JHW Hydrology All main stem rivers are forecast to remain below Monitor or Action Stage through mid week. Minor flooding of smaller rivers, creeks and streams with poor drainage will be possible. Soil moisture is expected to continue increase or saturate late in the week into the weekend with additional rain, increasing the risk of rockslides and mudslides, and minor flooding. Chance of main stem river stages exceeding monitor stage will also increase as we head into the following week, Dec 22-28. .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 11am PST Tuesday for PZZ450. Small Craft Advisory until 5am PST Wednesday for PZZ470. For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png |
Eureka CA Radar
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