"No provision of these rules prevents the use by an amateur station of any means of radio communication at its disposal to provide essential communication needs in connection with the immediate safety of human life and immediate protection of property when normal communication systems are not available." ― FCC Part 97 Rules & Regulations : Subpart E : Sec. 97.403
The Amateur Radio Emergency Service® (ARES) consists of licensed amateurs who have voluntarily registered their qualifications and equipment, with their local ARES leadership, for communications duty in the public service when disaster strikes.
SKYWARN® is a volunteer program with between 350,000 and 400,000 trained severe weather spotters. These volunteers help keep their local communities safe by providing timely and accurate reports of severe weather to the National Weather Service.
CERT curriculum addresses disaster preparedness for a variety of hazards and trains participants in basic disaster response skills, such as fire safety, light search and rescue, team organization, and disaster medical operations. CERT volunteers can assist others in their community following a disaster when professional responders are not immediately available to help.