Adam Rose Quoted on Disaster Alert Failures - New York Times/Reuters

In California last month, two young children and their great-grandmother died in a wildfire that family members say they never saw coming. 

In January, thousands of people were panic-stricken in Hawaii by a false alarm that a ballistic missile was about to strike the islands.

These and other critical failures have prompted a review of disaster alerts in the United States, which largely operate at a local level, underlining the potential need for a nationwide system, as scientists warn changing weather may bring more hurricanes and wildfires. Read more.