Snow Crystals
Learn all about the physics of snowflakes and ice crystals at this site from Kenneth G. Libbrecht, Professor of Physics at the California Institute of Technology. You'll also find snowflake watching tips and a guide to snowflake hotspots!
Intended Audience: General Reading Level: Middle/High School Teacher Section: No Searchable: No

Auroras: Paintings in the Sky
This site will show you what auroras look like from space and on Earth, explain how they are created, and show you where they can be found at this site from the Exploratorium in San Francisco.
Intended Audience: General Reading Level: Middle School Teacher Section: Yes Searchable: No

Skyscapes
Do some cloud gazing at this site that features images of clouds.
Intended Audience: General Reading Level: N/A Teacher Section: No Searchable: No