Welcome 
Theme - I chose weather for my theme. It is for fourth grade students. I think it would be best used in the spring due to erratic changes in the weather. Possible standards that might be addressed include:
describe the causes for Earth’s seasons.
Background Information
Lesson Plans
Student Pages
Cloud Background, http://www.geocities.com/Paris/Cafe/3094/weather/weather.html May 23, 2002