The Nationwide Emergency Alert System (EAS) is a communication system in the United States designed to disseminate emergency alerts and information to the public via radio, television, and other broadcast and cable channels. It is a crucial tool for authorities to relay important information during emergencies quickly.

EAS alerts can be activated by various authorized entities, such as the National Weather Service (NWS), local emergency management agencies, and even the President of the United States in the case of a national emergency. These alerts can cover many situations, including severe weather warnings, AMBER Alerts for missing children, public safety threats, and national security alerts.

The frequency of EAS alerts varies depending on the nature and urgency of the situation. Local and state authorities may issue alerts as needed, such as during severe weather events, while national-level alerts are relatively rare. The Presidential Alert, for instance, is meant for use only in the most extreme national emergencies and is rarely activated.

In summary, the Nationwide Emergency Alert System broadcasts important information to the public through various media channels, and its frequency depends on the specific emergencies.