SIOUX FALLS, SD (KELO) -- People who live in Minnehaha County, outside the city limits of Sioux Falls, will be hearing warning sirens going off Monday night, but there's no need to worry about the threat of severe weather then. The county will test their warning sirens at 7 p.m. on the first Mond ay of the month from now on, instead of the usual Saturday mornings. The sheriff's office says there are fewer volunteer firefighters available on weekends to ensure the sirens are activated. The City of Sioux Falls will continue its siren testing on the first Friday of the month at 11 a.m. ...read more read less