Amateur Radio operators set up and operate organized communication networks locally for governmental and emergency officials, as well as non-commercial communication for private citizens affected by the disaster. Hams are most likely to be active after disasters that damage regular lines of communication, i.e. power outages and destruction of telephone lines.
Many hams are active as communications volunteers with local public safety organizations.
In addition, in some disasters, radio frequencies are not coordinated among relief officials, and hams step in to coordinate communication when radio towers and other elements in the communications infrastructure are damaged. Amateur Radio operators have informal and formal groups to coordinate communication during emergencies. At the state level, hams are often involved with state emergency management operations. The following HF nets have been designated by ARRL Section Leadership officials as primary traffic outlets during section-wide emergencies.