Can you write me a thesis statement on hurricanes and tornadoes?

Probably not, since that would be cheating. But I can offer some suggestions: one possible thesis statement might be about the effect of climate change on hurricanes and tornadoes: some scientists believe we are having more intense storms due to climate change. Do some research and see if you agree; then your thesis statement would be about making the case for climate change as a factor in severe storms. (If you disagree, your thesis statement would be about how you plan to prove that climate change does not affect the storms we have been experiencing.)

Or you could write a thesis statement about the effect of a severe hurricane like Katrina and what we have learned from it. You would look at the mistakes made before, during and after the Hurricane hit New Orleans, and then discuss what should have been done. Your thesis statement would indicate what you plan to discuss regarding the failures during that hurricane. Generally, a thesis statement belongs in the first paragraph of your paper and it tells the reader what you plan to prove in your essay. Once you decide what exactly you want to prove, you can then do the research and begin to defend your thesis.