LOUISVILLE, Ky. (AP) — Heavy rains and dangerous flooding have struck the Southeast U.S. as much of the East endured a renewed round of harsh, soggy weather, with at least one fatality reported in Kentucky. Water has submerged cars and buildings in Kentucky and mudslides have blocked roads in Virginia. Both of the states were under flood warnings, along with Tennessee and Arkansas. The National Weather Service has warned residents to stay off the roads. Forecasters also have predicted weekend snowstorms in the Northeast and the threat of tornadoes for the Mississippi Valley. Heavy snow is expected to blanket much of New England. Meteorologists are also warning the U.S. could get its coldest polar vortex stretching event this season in the northern Rockies and northern Plains.