This map shows all sirens located in Johnson County along with their buffer zones. To view the interactive map, please visit  AIMS Interactive Map.

This map (from the June 2025 Tornado Warning) shows how Johnson County uses polygon-based warning activation for outdoor sirens. Instead of sounding sirens countywide or by zone, sirens are only activated within or intersecting the National Weather Service's tornado warning polygons (shown in red). This ensures alerts are targeted, accurate, and reduce false alarms, helping keep the public better informed and responsive during severe weather.