ORLANDO, Florida (Reuters) - The noted Colorado State University forecast team expects an above average Atlantic hurricane season and may raise its prediction of 13 tropical storms and seven hurricanes when it updates its outlook next week, the team's founder Bill Gray said on Wednesday. La Nina cool-water conditions in the Pacific and higher sea surface temperatures in the eastern Atlantic are contributing to enhanced conditions for hurricane activity, Gray told Reuters at the U.S. National Hurricane Conference. "We're expecting an above average season," Gray said. "The big question we have is, are we going to raise the numbers from...