The two had studied the physics - the fluid dynamic, in particular - behind the atmospheric instability that creates unique clouds. Kelvin-Helmholtz instability occurs when there's friction ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Zhe Li, University Corporation for Atmospheric Research (THE CONVERSATION ...

Did you hear thunder overnight? Here's how it happened, as explained by WTOL 11 Meteorologist John Burchfield.