From The RadioReference Wiki
Alertpage Inc. is a national leader in Public Safety Incident Alert Paging , providing accurate, real-time information about events even the media has not yet begun to cover.
Alertpage supplies News Media, Schools, Institutions, Companies, Local Government and County Officials, as well as the General Public with accurate, real-time Incident Information via Mobile SMS Text and Email 24 Hours a Day, 7 Days a Week, Every Day of the Year.
Alertpage Incident Alert Dispatchers include Public Safety Professionals (911 Operators, Firefighters, Paramedics, EMTs, and Police Officers) familiar with the emergency services response where the incidents take place. Some of the Types of Incidents sent to subscribers include Fire (Structure Fires, Hazmat Incidents, Marine Incidents, Rescues (confined space, high angle, trench, vehicle accident entrapment, etc.), Police (armed robberies, shootings/stabbings, officer in need of assistance, large disturbances/civil unrest), EMS (major trauma, mass casualty, medevacs), Severe Weather (severe storm warnings, tornado warnings) and Traffic (major artery delays and closures due to accidents and other causes).
Incidents are covered Nationwide with subscribers being able to choose their state(s), counties and incident types for the alerts they receive. Subscribers can choose as many states/counties/incident types as they wish and have access to a control panel to change their choices as often as they like. There is also a choice for National Major Incident alerting which includes all 2 Alarm or greater fires, major disasters, major mass casualty incidents, etc.
For a scroll of the National Incident Alerts being sent out right now visit their Live National Alert Page.