what is an extreme emergency alert

An extreme emergency alert is a type of Wireless Emergency Alert (WEA) that warns the public of an impending natural or human-made disaster, such as tsunamis, tornadoes, extreme winds, hurricanes, and typhoons. Extreme alerts are sent by authorized government alerting authorities through mobile carriers to mobile devices in the affected area. They are designed to get the attention of the recipient with a unique sound and vibration repeated twice. Extreme alerts are different from severe alerts, which include warnings for flash floods and dust storms. The difference between extreme and severe alerts is not clearly defined, and it may vary depending on the location and the type of emergency.