Thomas Shey
Legend
@Thomas Shey I didn't know 6th ed had gone and gotten a hero point system. I haven't actually read the 6th ed rules except for Fantasy Hero Complete, which I admit I only skimmed. But I have definitely borrowed some 6th ed concepts for my homebrew HERO. e.g. got rid of figured characteristics.
Its an optional rule, and like I said, its pretty weaksauce (same for its power stunting system). My guess would be that Steve Long or whoever put them in did so reluctantly (which I can understand a little better with the Power Stunting; at some point you have to decide that its not going to be a cheap VPP. Most of the games that do one have it fueled from a metacurrency which keeps it in hand. As I recall, Hero just does it off a skill roll.)
4th ed has some details about things like fires (from house to forest to chemical), electricity, and chemical spills. But as far as I remember there was nothing specific about ways to run a natural disaster. But, as others have suggested, disasters are the perfect chance to run a skill challenge. Certainly how'd I'd run it nowadays.
I distinctly remember something about tidal waves and earthquakes. Of course, given my age and general memory, I could be conflating it with a different system, too.
