One Sky, Many Voices
This eight week program for middle school from the University of Michigan explores basic weather concepts through the gathering and posting of local data, data comparisons and communicating with mentor scientists and peers. You can learn more about the projects here and find out how your class can participate.
Intended Audience: General Reading Level: Middle School Teacher Section: N/A Searchable: No

Weather One
This site from the University of Illinois Extension has basic overviews of seasons, clouds, wind, and severe weather and activities for students.
Intended Audience: Students/Teachers Reading Level: Middle School Teacher Section: N/A Searchable: Yes

Watch Out...Storms Ahead
You can download Owlie Skywarn's Weather Book from NOAA here. This is very large pdf file.
Intended Audience: Students/Teachers Reading Level: Elementary School Teacher Section: N/A Searchable: No