Emergency radios provide critical information and communication in a disaster. Radios can provide an early warning system. In a addition, two aspects of communication can have a significant influence on your post disaster experience. Your radio should allow you to signal others and receive up-to-date information on what is happening in your area. Radios with AM, FM, Shortwave, and NOAA weather channels can provide psychological comfort after a disaster as well, by providing you with valuable information about rescue and relief efforts.