In the aftermath of a storm, banks might not be open and ATMS might be shuttered. One word, well actually four words: cash or traveler's checks. Before a storm hits, go to the bank or ATM and withdraw money. After a storm, some businesses might reopen even though they don't have any power. Without power, the clerk isn't going to be able to swipe your debit or credit cards. If you need to buy extra food, fuel, or other items, having cash in your pocket is the only way you can transact business.