We know hurricanes need warm ocean temperatures to get going. But how can you get them to slow down? That's hard, Judt explains. To really stop a hurricane from forming, he says, you'd need to cool down the ocean, suck the humidity from the air, or blow strong winds against the grain of the storm. And the jury is still out on what really causes smaller storms to turn into hurricanes. Some smaller disturbances can peter out, but others get out of control quickly. The factors that tip the balance either way aren't entirely clear. "We're not really sure yet," he says. "About 90 percent of precursor disturbances do not become hurricanes."