At 2:20 p.m. ET, FEMA is testing its ability to send emergency alerts to cellphones, TVs and radios on a nationwide scale. WSJ looks at why this alert is happening and explains how the technology of the alerts has evolved.
At 2:20 p.m. ET, FEMA is testing its ability to send emergency alerts to cellphones, TVs and radios on a nationwide scale. WSJ looks at why this alert is happening and explains how the technology of the alerts has evolved.