Low, long-period, ocean swell which commonly precedes the main swell from a distant storm, especially a tropical cyclone.
The Forerunner was a monthly magazine kept by Charlotte Perkins Gilman (mostly known as the writer of The Yellow Wallpaper), from 1909 through 1916. During that time, she wrote every single line of it - all editorials, critical articles, book reviews, essays, poems, stories, and six serialised novels.