Tropical Storm Isaac is a strange storm. As it steams toward New Orleans today--it's projected to make landfall tomorrow, seven years to the day after Katrina came ashore--it still lacks the kind of coherent organization typical of similar tropical storms. At least, that's what a couple of leading researchers at the National Oceanic and Atmospheric Administration are telling PopSci today. But in its strangeness Isaac isn't really a strange case at all. It's tough to tell what these kinds of weather systems are going to do next, and that's a major problem for forecasters attempting to advise those in the storm's (projected) path. That's why NOAA is sending in the robots.