Area Forecast Discussion
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
248 FXUS66 KEKA 152140 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 240 PM PDT Sat Aug 15 2026 .KEY MESSAGES... * Smoke spreading overnight from local and distant wildfires, pushing eastward during the diurnal swing as winds pick up out of the north. * Cooler temperatures as upper wave troughing pattern stalls over the area. && .SYNOPSIS...An upper level troughing pattern has stalled over the greater PACNW. Inland areas can expect cooler temperatures with the coast continuing to have overcast conditions and brief afternoon clearing. Generally mild weather is expected for the next week. && .DISCUSSION...Troughing continues over the area through the weekend and into early next week. This has supported a much deeper marine layer with stratus reaching far inland, along with moderated interior temperatures. Near to below normal temperatures are expected to continue through much of the week as the troughing continues. High pressure may briefly rebuild early to mid week, but models are not showing a significant warm up and interior temperatures are likely to remain near normal (with most valleys in the 90s). Coastal areas are seeing stratus persist through the afternoon,and this is likely to continue so long as afternoon winds remain light. Even then, only partial afternoon clearing is likely. All said, generally mild, seasonable weather is expected for the next week. && .AVIATION...With an extremely deep marine layer, ceilings have lifted despite up stream high pressure filling in after the passing shortwave. The overall synoptic pattern is a stalled open wave upper level trough which will contribute to overnight overcasts conditions but with the deep marine layer, lifting ceilings fairly quickly during the day time transition. MVFR conditions will set in after 18z or so for the coastal terminals, if the current pattern persists. KUKI had a few hours of IFR/LIFR overnight and with moisture and calm winds it could repeat tonight but guidance has low probability of such an occurrence. /EYS && .MARINE...Northerly winds are diminishing in the northern waters with isolated areas south of Cape Mendocino accelerate around the point this evening at 30-33kts. No advisories at this point but that could change by mid week as northerlies build in the southern inner and outer waters. A long-period southerly swell of ~3ft has built into the region and will mix with northerly shorter period waves. However, the overall sea state should remain mixed with these two wave groups through the start of next week. Light to moderately breezy (~20kt) winds are expected through the extended forecast. && .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