SCIENCE THURSDAY -- November 8, 2012 at 11:10 AM EDT Louis Uccellini, head of environmental prediction for the National Oceanic and Atmospheric Administration, explains the unique challenges of tracking Hurricane Sandy. Update: 6:15 p.m. ET | As Superstorm Sandy barreled its way west from the Caribbean to the Mid-Atlantic states and then swiveled north up to Canada, forecasters scrambled to understand it. The storm was unusual. It arrived late in the season and was fed by unseasonably warm waters. It was pushed inland by a high-pressure system and then merged with a cold front moving