Side-view cross-section of flat country under a low sun. Warm thermals rise from the heated ground and a small cumulus cloud forms where they cool. The cloud keeps growing into a towering storm cloud. A drone that was hovering to the left lands on its pad while the cloud is still building. Rain then falls from the cloud, and the gust front, a wedge of cold outflow air, spreads along the ground ahead of the rain and passes the landed drone. The cloud then fades and the cycle repeats. One label at a time: Thermals, Cumulus, Gust front.
