Snow flakee Hail

• Snow crystals form when tiny supercooled cloud droplets (about 10 μm in diameter) freeze. Once a droplet has frozen, it grows in the supersaturated environment.

• Water droplets are more numerous than the ice crystals the crystals are able to grow to hundreds of micrometers in size at the expense of the water droplets.

• Hail forms in storm clouds when supercooled water droplets freeze on contact with condensation nuclei, such as dust or dirt.

• The storm's updraft blows the hailstones to the upper part of the cloud.

• The updraft dissipates and the hailstones fall down, back into the updraft, and are lifted again.