They haven't and from what I remember reading on WABC's AccuWether Chat Board, Bill Evans and Lee Goldberg had been opposed to 7 day forecasts because of how easily just the 4th and 5th day of 5 day forecasts could change. This was about two or three years ago and they said they didn't believe the technology available then could help make a proper 7 day forecast so, I'm assuming, they feel comfortable with whatever technology they currently have to forecast out to day 7.