I bought this unit a couple of years ago and we had a bunch of tornado warnings since then. You need to set it up correctly first of course. The instructions are very clear, but some people may have trouble. I set it up so that only visual indicators light up for things like Flood or Severe thunderstorm. However, when there is a Tornado warning, the clock starts screaming so loud, you can hear it anywhere in the house. Works great! I live near a county border, so I have it set up for 2 counties and it alerts when a warning is issues in either of those counties. My only complaint is the display. If there are several alerts at the same time, you have to wait for them to scroll. The night light is so bright, I disabled it.