While wind shears in the upper atmosphere are usually vertical, they tend to be horizontal closer to the runway. Horizontal wind shears can create eddies or swirls, of air that cause turbulence. A microburst is a type of wind shear associated with a thunderstorm and caused by a current of sinking air.
Apple Music. Not to be confused with Apple Records. Apple Music is a music-streaming service, developed by Apple Inc. Users select music to stream to their device on-demand, or they can listen to existing, curated playlists.
Mac and PC users can also access Apple Music, while Android and Apple TV owners will have to wait until the autumn. 14.30 . Welcome to The Telegraph's live blog of the launch of Apple's new music streaming service, Apple Music, which is due to launch at 16.00 GMT this afternoon.