What is network flooding and how does it work?

Tonight, 13 million people are under flood watches or warnings. In Washington state, a truck driver was rescued by U.S. border patrol, which brought in a tractor to get him to safety after floodwaters trapped him in his truck. Rain has washed out a highway in the mountains east of Seattle and in Boulder, Colorado, wind is the problem, with blinding conditions making driving difficult. Across the country today thousands of flights have been delayed and hundreds cancelled. CBS Meteorologist Andrew