Right now Tropical Storm Isaac has crossed Haiti, killing three, and is headed for Florida; the prediction is that it’ll become a hurricane before it hits the Sunshine State.
Hurricane season runs roughly from June through October every year. The time to prepare for a hurricane is before it’s a cloud on the horizon. Accuweather.com has a decent hurricane-preparedness page.
Since forehandedness is a virtue, here is a list of some previous Making Light posts that deal with the issues. As always most of the value is in the comment threads.
The comment threads there are still open and years-old posts can be active here.