This unit is enough to make you completely INSANE. If there is a way to set this thing to go off for ONLY tornado warnings I have not found it. This thing goes off nonstop. I am in Kansas right now, about 3 miles from the Missouri river. Between the thunder storm warnings, the flood warnings, the canceled warnings, etc the stupid thing goes off every few minutes during a storm. I DON'T care about the small stream flood warnings, the thunder storm warnings, etc. especially at 3 am. It goes off so much that we often give up and unplug the stupid thing. Currently there is a massive storm outside and this stupid thing has gone off at least a dozen times in the last hour. We gave up and unplugged it. I was so annoyed by the dumb thing I had to get online to post a warning. Make sure when you pick a unit that you can set it to ONLY warn you when there is a tornado or some REALLY sever weather, especially in the middle of the night.