Accept reasonable answers. Possibly by paying more attention to weather forecasts or by not taking chances unnecessarily while driving in flash flood conditions, such as not driving across a road when water is flowing over it. As a small water drop is blown upward inside a cloud, it collides with other supercooled drops, growing larger. The speed of the downdraft determines the speed of the hail. The cloudy ice is caused mainly by rapid freezing, trapping many air bubbles.
Hail comes in strange shapes, sometimes with ragged edges.
Answers should include crop losses, property damage, injury, and possible death. Accept reasonable answers. Losses include damage to mobile homes, roofs, and airplane crashes. Tornadoes are relatively small, while hurricanes cover hundreds of miles. For tornadoes, the updraft must be halted for a while by a layer of warm air just above the ground.