A storm system is putting 45 million people from Texas to New York on alert for severe weather on Tuesday, while those in states from Texas to Missouri are bracing for major flash flooding. Here's what you need to know:

Scattered severe thunderstorms, hail and damaging winds are in store for a large stretch of the country on April 29, forecasters said.

A powerful storm system that brought severe weather to the central U.S. on Sunday and Monday will continue to charge east on Tuesday, fueling a 2,000-mile threat zone stretching from the Northeast to Texas.