Wednesday is a nationwide test of the federal emergency alert system. Cellphones, televisions and radios across the United States will broadcast a test at around 11:20 a.m. Arizona time. FEMA says this year will mark the seventh nationwide test of the Emergency Alert System. Six previous tests were conducted over the years between November 2011 and August 2021. This will be the third nationwide test of wireless alerts, and the second nationwide test transmitted to all cellphones. FEMA officials say no personal data will be collected from anyone’s devices in the process. Wednesday’s test will evaluate the technological capabilities of the national alert system to reach and inform as many people as possible in case of a widespread emergency.