Forecaster: 'Just Can't Pinpoint' Isaac's Track

Forecasters say there's still uncertainty about the path Tropical Storm Isaac will take. It's expected to head toward Florida as a hurricane by Monday, but the National Hurricane Center says it could go further west into the Gulf of Mexico. (Aug. 23) DATELINE: MIAMI, FLORIDA, AUG 23, 2012 SOT Rick Knabb, director, National Hurricane Center: "Isaac is proceeding westward over the eastern Caribbean sea, it's still a low-end tropical storm without really an inner core. And it's going to take some time, it seems, for it to develop a core." SOT Rick Knabb, director, National Hurricane Center: "Overall, the atmosphere environment -- look at this upper level outflow -- there's not much wind shear at all to speak of, to tear apart the thunderstorm activity. So, the waters are warm, the shear is weak, it's just whether or not it develops an inner core, and how much time it spends over land." SOT Rick Knabb, director, National Hurricane Center: "And the models can change over the next few days, so we just can't pinpoint where the...