Found at the campground. Found two of these that evening. This moth matches size, description, images, flight time and location for Euxoa misturata. Key characteristics of that species are white underwings, smallish orbicular spot with ocellus, and dark shading across entire terminal area. According to description and images at Pacific Northwest Moths, this species can vary significantly in forewing color and presence of transverse lines. Using comparisons of similar species at Pacific Northwest Moths, I was able to rule out the species listed there. Euxoa latro can also appear similar to this moth, however that species does not have white hindwings. Here is a link to the other moth found that evening that appears to be the same species: