I hate to be the bearer of bad news, but the trick floating around the Internet about storing your valuables and documents in the dishwasher during a hurricane isn't one you should heed. If flooding occurs, a dishwasher won't keep things dry.
You should have photocopies or electronic copies of your personal, home and property, estate, medical, and financial documents stored on a flash drive or on a cloud. Think things like Social Security card, stock and bond certificates, home deeds, passport, and estate planning paperwork.
But if you're down to the chase and don't have time, you should put all documents and cash in tightly sealed Ziploc bags to be placed in a grab-and-go lock box. If you've evacuated or are taking shelter away from your home, you may not be able to get back for days — and you'll need these things on your person.