As tornadoes and straight-line winds blew off roofs and destroyed buildings Tuesday night in Sioux Falls, South Dakota, most of the city’s warning sirens failed to sound.
Sioux Falls Mayor Paul TenHaken said Wednesday that the problem was caused when an employee in the city’s 911 dispatch center didn’t follow the proper procedure to initiate all 77 of the city’s warning sirens, the Argus Herald reported. Instead, only one quarter of them were activated.