COMET MetEd: This is a free collection of hundreds of training resources intended for the geoscience community.
http://www.meted.ucar.edu/
Lesson plans and activities for teaching about weather to kids in upper elementary and middle school. Developed by National Center for Atmospheric Research and University Corporation for Atmospheric Research.
http://www.eo.ucar.edu/educators/KC_guide_intro.html
The Clouds Outside My Window!
A
picture book on clouds created by a National Weather Service Meteorologist with a
template to make your own!