Oh thank goodness...I heard that thing so off and it was SO loud and went on forever. I had no idea what it was. All the dogs in my neighborhood were howling like crazy. Glad to know it was only a test. At least when it happens again I will know what it is. Question though...how do we know the difference between a test and a real emergency? I haven't lived in SOMD very long and have never lived anywhere near a plant like that. I suppose if everything starts glowing it wasn't a test huh?