America's present heat wave is so big you can see it from space

If you live anywhere on the eastern half of the United States, you’ve probably been sweating it out over the past several days in what certainly feels like the warmest week yet for the season. The cause of the oppressive weather? A large mid-level ridge centered over the Ohio Valley — large enough to be easily visible… » 7/18/13 6:40am 7/18/13 6:40am