I'm always excited when I find a new, free, online resource for kids. Last night I found SPARK - UCAR Science Education. http://www.eo.ucar.edu
They have a great section on their website called Web Weather for Kids.
Here are some LINKS to pages about CLOUDS that will work great with this Weather Unit. I think the kids will enjoy the last 2 links best! :)
~ Web Weather for Kids Home Page
~ Clouds - Main Page
~ How Do Clouds Form?
~ Cloud Types
~ Cloud Matching Game
~ Cloud Concentration Game