For earthquakes: Crackle: DUH!
For tornadoes: how about a water marble or drag marbling to make a swirly!
For Cloudy Skies: Start with a dark color and then sponge a lighter color in cloud shapes.
For rain drops: I used a dotting tool and just put a little drag in it to create the drop.
And the last nail is just weird, and I apologize for that, it was supposed to symbolize the eye of the hurricane, but it was kind of a big fail! OOPs!
Oh well, hope you liked these nails! And I hope the weather where you live has been much calmer then here!