392 FXUS66 KEKA 271935 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1235 PM PDT Sun Jul 27 2025 .SYNOPSIS...Thunderstorm chances remain for Sunday afternoon. Near normal to slightly below normal temperatures expected into early this coming week. Another upper low could bring chances for thunderstorms mid week. && .DISCUSSION...Some mid-level moisture remains in the area making isolated thunderstorms possible for Sunday afternoon to evening in the Trinity Horn region. Chances of thunderstorms are less than 25%. Chances drop off for early this week. High pressure is expected to generally remain east of the area. This will keep temperatures near seasonal normals with highs in the upper 80s to low 90s. Coastal stratus is expected to form each night during this time with the potential for some clearing into the afternoons. Thunder potential generally looks to remain low. Ensembles are hinting at another upper-low forming right off the coast, which may return thunderstorm chances by mid this coming week. This thunderstorm potential will be monitored as the threat approaches. && .AVIATION...(18Z TAFs) VFR will prevail during the daylight hours along the North Coast. IFR to return (50-60% probability) this evening with ceilings around 500-800ft. Mendocino Coast expected to have persistent fog due to coastal trapped eddies. Winds to remain light and from the W/NW. Inland, deep cumulus convection is forecast for Trinity County during the afternoon and evening. Moderate turbulence and low level shear, gusty outflow winds and heavy precip rates will also be possible in and around thunderstorms. VFR conditions will be present away from storms. && .MARINE...A weak pressure gradient between an offshore ridge and an inland trough will continue to maintain a gentle to moderate wind regime through Sunday. Stronger winds with gusts to 25-30kt are likely in the lee of Cape Mendocino. Seas are forecast to remain low and dominated by 2 to 5 foot wind waves and a 1 to 2 foot long period southerly swell. Highest wind waves will remain over the outer waters and in the lee of Cape Mendocino. Northerlies are forecast to increase next week, strongest over the outer waters and downwind of Cape Mendocino. && .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