It's a Breeze: How Air Pressure Affects You - From NASA
 
Edheads Weather Activities - Play an interactive game to learn how to report and predict the weather.

National Weather Service – Playtime for Kids

The Disaster Area (FEMA for Kids) - Learn how to keep safe from floods, hurricanes, tornadoes, and thunderstorms

Hurricane: Storm Science
From the Miami Museum of Science.  Learn how to track a hurricane, what it is like inside a hurricane, and some "killer" hurricanes like Andrew and Camille.

Make Your Own Weather Station
From the Miami Museum of Science.  Use ordinary household objects to make a weather station at home.

Kids' Lightning Information and Safety
Written by a kid who was hit by lightning.