628 FXUS66 KEKA 030549 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1049 PM PDT Thu Oct 2 2025 .SYNOPSIS...Cool conditions will persist for one final day Wednesday even as skies begin to clear. Warmer and drier conditions will build across the interior this weekend with a weak diurnal marine layer right along shore. && .DISCUSSION...After several of persistent rain showers crossing the area, the final cold front has finally crossed the coast and will gradually exit the interior by early Friday with the few remaining showers gradually dissipating. In aggregate, generally 1 to 2 inches of rain have fallen across the area in the last 3 to 4 days with 0.5 inches of rain even for the far southern most parts of the area in Lake County. Most of the rainfall on Monday and Tuesday. The back end of an upper level trough will linger over the area Friday, generally keeping conditions cool and moist despite clearing skies with interior highs generally only in the 70s. High pressure building along shore will contrast with the trough, helping to create consistent northerly and onshore winds near the coast with some afternoon wind gusts near 20 mph in exposed areas. Increasing stability and onshore flow will promote a lower, ragged marine layer in comparison to the higher clouds over the past several days. High pressure will gradually continue to build across the area this weekend. This will bring increasingly strong north wind near shore with some gusts over 25 mph pushing into shore in the afternoon, especially for the Mendocino Coast. Otherwise, interior conditions will gradually warm and dry out with interior valley highs returning to the mid 80s. That said, increasingly short days will limit the potential high end of warming. Coastal weather will come to be controlled mostly by weak, diurnal marine influence. There is high confidence that general high pressure will dominate the weather pattern through most of next week. The interior will generally remain warm and clear with only a modest increase in diurnal north winds early in the week. A burst of offshore flow may weaken marine influence for the coast around Monday an generally increase highs, but otherwise, a regular diurnal marine pattern will persist. There is general agreement that low pressure of some kind will impact the area by next weekend. The impact of this system, however, is variable with most models keeping conditions dry but about 30% showing light wetting rain potential. /JHW && .AVIATION...(6Z TAFs)...Showers have largely began to taper off across the area, with most shower activity limited to Trinity County for the rest of the night. Generally IFR to MVFR ceilings are expected tonight with widespread low clouds. Light offshore flow is being observed at the coastal terminals, which may keep ceilings elevated (MVFR) through the rest of the night. Some brief scattering or clearing along the coast is possible too. Skies are likely to clear by the late morning or early afternoon across the area. Breezy northwesterly winds are possible in the afternoon, especially at CEC where gusts may exceed 20 kts. HREF is showing high probabilities for stratus to return in the evening around Humboldt Bay and ACV. JB && .MARINE...Combined seas have finally dipped below 10 ft across the waters as winds remain light. Northerlies fill back in today with gusts peaking around 20-25 kts this afternoon in the outer waters and nearshore Mendocino. Winds nudge further upward Saturday, bringing localized gale force gusts in the waters in the lee of Cape Mendocino. Peak gusts elsewhere range from 20-30 kts. Gale potential expands late Saturday into Sunday with NBM showing a 30-50% chance for gales, however this may be short lived. Short period seas will dominate the sea state, with steep waves of up to 7-9 ft currently forecast by the weekend. These will likely propagate into the inner waters, even as winds remain lighter. High pressure weakens by late Sunday into early next week, and winds are likely to ease. JB && .FIRE WEATHER...Wetting rain showers are finally winding down across the area. Still cool, but much clearer and drier conditions will begin to build in Friday. Conditions will continue to warm and dry this weekend with low elevation highs returning to the mid 80s and daytime RH drying to below 30 percent. Thermal belts will also strengthen throughout the weekend, maintaining very high overnight RH recoveries in valleys but greatly drying overnight conditions at upper and midslopes with overnight RH below 40 percent by early Monday. Winds will mostly be very gentle and terrain driven, with a notable exception around Monday when moderate to strong northeast flow gusting over 20 mph should be expected late Sunday night into early Monday. Warmer and drier conditions will persist much of next week. /JHW && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 3 PM Friday to 11 PM PDT Saturday for PZZ455. Small Craft Advisory from 11 AM to 11 PM PDT Saturday for PZZ470. Gale Watch from Saturday evening through Sunday morning for PZZ470. Small Craft Advisory from 3 PM Friday to 3 PM PDT Saturday for PZZ475. Gale Watch from Saturday afternoon through Sunday morning for PZZ475. && $$ NOTE: The full forecast discussion is now regularly issued between 10 am/pm and 1 pm/am. Additional updates will be issued as needed. Visit us at https://www.weather.gov/eureka Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png