Area Forecast Discussion
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
765 FXUS66 KEKA 072059 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1259 PM PST Sun Dec 7 2025 .SYNOPSIS...A passing warm front with light rain and drizzle is passing over Del Norte and Humboldt counties today. Generally dry weather conditions are expected to prevail across NW CA this coming week, with periods of light rain/drizzle continuing for the North Coast. Building high pressure will bring much above normal to record high temperatures through the week. && .DISCUSSION...Light showers to light drizzle can be expected to continue along the North Coast, mainly in Del Norte. The far southern periphery of a strong storm system to the north will maintain chances for some showers and and light drizzle through Thursday for these described areas. REFS probabilities for 24 rainfall over 0.1 inch reach 30 to 50% through Monday for Del Norte County. Chances quickly drop to zero further south. Periodic persistent and accumulating light drizzle is likely along the North Coast however. It will remain dry elsewhere with increasing high temperatures. The persistent ridge of high pressure southwest of the region responsible for blocking stronger weather systems will strengthen and nose eastward through the workweek. Significant warming will occur as a result. The current forecast yields high temperatures in the interior reaching 10 to 15 to locally up to 20 degrees above climatological norms mid to late this week and into the weekend. NBM shows a high probability (70 to 80%) for the warmer interior valleys to exceed 70 F Thursday and especially Friday (80 to 90%). This would likely break high temperature records for Ukiah if the forecast holds. Some ensembles are indicating a wetter pattern change through next weekend. There is a great deal of variability, with uncertainty in how quick the ridge weakens, but some (15%) of the ensemble members show over 1 inch of 24 hour rainfall. JJW && .AVIATION...MVFR ceilings are being observed at the coastal terminals as light rain showers periodically impact the area. These will continue through the afternoon. IFR ceilings are possible later this afternoon and evening, especially around CEC, with more consistent rainfall. Little rain is expected outside the Humboldt and Del Norte coasts and generally VFR conditions are forecast through the day. Some interior valleys could see stratus and fog again tonight, but confidence is low on UKI seeing any. JB && .MARINE...Generally light winds are forecast through at least the middle of next week, with south winds forecast north of Cape Mendocino and west-northwest winds forecast south of the Cape. A mid period northwest swell has peaked and has started to decay. Seas subside into early Monday as this swell decays. Another mid-period northwest swell will fill in Monday afternoon and evening, peaking at 7-9 ft at 13 seconds by Tuesday. Combined seas may briefly reach or exceed 10 ft Tuesday. Additional mid-period northwest swells will continue to fill in through the week. JB && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... None. && $$ 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