USA Today
Usa Today: How Winter Storms Bring Rain, Ice and Snow
A great diagram of precipitation and what forms at different degrees. A short description on the formation of rain, snow, and sleet.
Other
Chase Day: Hail and Hail Storms
Page provides four links to hailstones, hail fall, hailstorms and punching. Also includes a picture of large hail and more links for further information.
National Earth Science Teachers Association
Windows to the Universe: Hail
Read a paragraph about the formation of hail.
University of Illinois
University of Illinois Urbana Champaign: Hail and Rain
Find out how hail is produced. You will discover the relationship between hail and thunderstorms.
USA Today
Usa Today: Rising Air Creates Spring, Summer Ice
This article gives you basic information on hail. There are links at the bottom of the page to how hail forms, how updrafts breed hail and thunderstorms.