Talk about right place right time! As I was pulling out of my parking spot leaving work, I got a twitter IEMbot notification that my county had just gone under a Severe Thunderstorm Warning. Started recording and drove up the road to the nearest siren, and waited for it to sound. The warning was barely clipping the south end of the city, but there were sirens within the warning area and the county does not have polygon-based activation, so all sirens activated. Sirens in Eau Claire county are activated for Tornado and Severe Thunderstorm Warnings.