Waves of rain are expected to lash the U.S. this week, with forecasters warning of "generational" rainfall for some areas.

EDT the National Weather Service issued an updated flood warning in effect until Sunday at 6 a.m. EDT for Arenac County.

The National Weather Service released a flood warning at 4:52 a.m. on Tuesday in effect until Friday at 1 a.m. for Columbia County.