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 ...

High pressure often represents stable air, while low pressure can signify instability. On a cold, sunny day there will be a significantly higher atmospheric pressure than when a big storm is ...

(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 ...