A tropical wave may develop into Gabrielle in the eastern Atlantic Ocean. Meteorologist Rob Shackelford has our latest forecast. | The Weather Channel

It's pretty simple: Flash flooding happens when too much rain falls too fast over the same area. But predicting exactly where and when nearly instant flooding will happen is not so simple. Meteorologist Molly McCollum looks back at "the summer of floods" and what we can learn from some hard, painful lessons: | The Weather Channel