CNN CNN Newsroom May 19, 2013 23:51:00
They go to the mall, especially during graduation. >> that's a new term, don. debris ball is a very new term. it's because we have dual pole doppler radar. we used to have doppler radar that would see in one direction. we actually have the wavelengths going in two opposite directions. up and down, the horizontal and also on the vertical. therefore we can term whdetermi we see on radar is not a rain drop. it might be a shingle, could be a leaf, could be a tree limb. it might be any part of a house. the radar knows the size of the stuff and it's saying, the information, this is not a raindrop. t...