FORT LAUDERDALE, Florida (Reuters) – The threat of an above-average 2010 Atlantic hurricane season has increased over the last month and it now promises to be "very active," two leading U.S. forecasters said on Wednesday. William Gray and Phil Klozbach, who head the respected Colorado State University hurricane forecast team, said they would ramp up their prediction for the 2010 season in a report due out on June 2.