That's really not at all fair, the NWS has put a lot of effort since the Joplin tornado into localizing warnings as much as possible to the affected area. They

That's really not at all fair, the NWS has put a lot of effort since the Joplin tornado into localizing warnings as much as possible to the affected area. They may geolocate the warning based on the tower rather than the phone, but that's still a long way away from "across the state". And you maybe should look into it, but flash floods have nothing to do with bodies of water. You could be 1k feet above a lake on the side of a mountain, but that mudslide caused by torrential rain might be a problem for you.