The skies above us offer a dynamic theater of shifting colors, boiling thunderheads, scatterings of ragged white patches adrift on a changing cerulean canopy, beams of light, spectral halos, and flashing lightning. This is the sky of Earth. Although we will see hints of our weather on other worlds, our skies are unique. Before we can truly understand alien skies, we need to first understand Earthly weather and what makes it tick. In an odd cosmic twist, by studying and comparing our weather to others we’ll actually learn about how our own world works.