The Science Of Why Sandy Is Such A Dangerous Storm

Here are a few reasons government forecasters at the National Hurricane Center and emergency management officials are so concerned about Sandy:

1. Sandy is one of the largest hurricanes ever to strike the U.S. Sandy’s winds cover an area of more than 1,000 miles in diameter. That’s enormous by hurricane standards. So instead of affecting an area a couple of hundred miles across, Sandy will cut a huge swath. That means many millions of people are probably going to be exposed to high winds, heavy rains, and, for those on the coast, powerful storm surge.

2. Sandy is a very slow-moving storm. Sandy was slowing as it turned inland in a northwesterly direction. That means many places could see two full days of heavy winds and rain, not just a few hours. Sandy is now packing winds of more than 90 miles per hour, according to latest update from the National Hurricane Center. Forecasters say some places will get a foot of rain and they expect widespread flooding, wind damage and power outages.