In This Minecraft 1.6.4 Weather and Tornadoes Mod Showcase:
This Mod adds some of the craziest weather that you could imagine. Huge storms with tornadoes can pick up blocks and throw mobs flying around with ease. The blocks will eventually land back on the ground, but the destruction is deadly. If you step too close it may end out causing your death! This is certainly one of the best Minecraft Mods.