Scholastic
Scholastic: Dirtmeister's Science Lab: Weather or Not
Simple experiments for exploring clouds and cloud formation. You'll find out whether dust in the air helps cloud formation and discuss how dust helps meteorologists make weather predictions.
Science Education Resource Center at Carleton College
Serc: Investigating Three Main Ingredients Needed to Create a Cloud in a Bottle
In the science lab, students will create and observe the conditions necessary to make a cloud in a bottle.
University Corporation for Atmospheric Research
Ucar: Web Weather for Kids: Create a Portable Cloud
Using six common objects you can make a portable cloud. Get all the directions you need at this site.