The National Hurricane Center warned that wind hitting upper floors will be stronger than those in most storms during Irene. New York (CNN) -- The National Hurricane Center on Saturday warned residents of tall structures in the path of Hurricane Irene that the wind hitting upper floors will be stronger than those in most storms. "As Irene moves through areas with high-rise structures, these structures will experience winds significantly stronger than indicated by the advisory intensity," forecasters said. "Winds at the 30-story level will likely be 20% higher than at the surface. And winds 80-100 stories up could be about...