988 FXUS66 KEKA 262037 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 137 PM PDT Sat Jul 26 2025 .SYNOPSIS...Thunderstorm chances drop off for the weekend. Near normal to slightly below normal temperatures expected into early next week. Temperatures trend slightly upward towards the later parts of next week. && .DISCUSSION...The upper low that brought convection to mostly Trinity County on Friday moves to the east Saturday, taking most mid-level moisture with it. As a result, thunderstorm chances significantly decline into the weekend; however, isolated thunderstorms could still occur in the afternoon to evening hours in the Trinity Horn region both Saturday and Sunday with chances significantly less on Sunday. Late this weekend and into the middle of next 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 next week. This thunderstorm potential will be monitored. && .AVIATION...(18Z TAFs) IFR conditions are clearing to MVFR (and potentially VFR) conditions through the morning. An upper level trough will increase mixing allowing ceilings to lift and scatter through the daylight hours. Light winds are expected today as coastal eddies spin keeping winds variable. The upper level trough will keep the marine layer deep and moist through the night allowing for IFR conditions to return to the coastal areas and river valleys. Inland, fog is currently evaporating and will give way to VFR conditions with light winds through the day. In Trinity County, there is about a 10-20% chance for Thunderstorms this afternoon with potential dangerous downburst winds up to 40kts and heavy rain. && .MARINE...A weak pressure gradient between an offshore ridge and an inland trough will keep winds gentle to moderate through the weekend. Northerlies will accelerate around Cape Mendocino and result in a narrow band of gusts around 25 kt through Saturday. Seas around 3 to 5 feet are expected, with the lowest waves expected nearest the coast. The sea state will be dominated by 2 to 5 foot wind waves and a small long period southerly swell. Northerly winds are forecast to increase early to mid next week to fresh breezes over the outer waters and in the lee 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