A northbound hurricane •Hurricane Sandy is moving slowly toward the north-northeast but is expected to turn to the north and west later Sunday and Monday, forecasters say. At some point, it's expected to become what's known as an extratropical storm. Unlike a tropical system like a hurricane, which gets its power from warm ocean waters, extratropical systems are driven by temperature contrasts in the atmosphere.
Although Sandy is currently a hurricane, it's important not to focus too much on its official category or its precise path (current models show it making landfall over New Jersey or Delaware sometime early Tuesday). It's a massive system that will affect a huge swath of the eastern U.S., regardless of exactly where it hits or its precise wind speed. For example, tropical storm-force winds can be felt more than 500 miles from the storm's center, according to the National Hurricane Center. It's already caused some minor flooding in North Carolina's Outer Banks and has prompted evacuations elsewhere. The Federal Emergency Management Agency has personnel and supplies spread as far west as the Ohio River Valley, said Craig Fugate, the agency's director.
Early winters storm •Sandy is expected to merge with a wintry system from the west, at which point it will become the powerful superstorm that has forecasters and officials across the eastern U.S. Winds from that system will pull Sandy back toward the U.S. mainland.