In terms of atmospheric moisture, what is significant about the formation of hailstones?

The formation of hailstones indeed showcases the interaction between liquid and solid water phases. Hailstones form within strong thunderstorms that have intense updrafts, allowing supercooled water droplets—liquid water that exists at temperatures below freezing—to collide with ice nuclei. This process leads to the growth of hailstones as they acquire layers of ice, eventually becoming heavy enough to fall to the ground.

This interaction is a critical aspect of the water cycle and illustrates how different states of water can coexist and transform under varying atmospheric conditions. The dynamics of hail formation serve as an excellent example of phase changes in weather phenomena, making it a significant event in the context of atmospheric moisture.