Inverted Trough Inverted trough: Wind shift axis extending to the NW of a low that brings locally heavy precip. See Norlun Trough. Share this cool post: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Share on Reddit (Opens in new window) Reddit Share on LinkedIn (Opens in new window) LinkedIn Share on Tumblr (Opens in new window) Tumblr Like Loading...