Fernand has weakened since it made landfall in Mexico. However, flooding remains a major concern.
A widespread frost and freeze is expected Monday night and Tuesday morning from New York to North Carolina.
River flooding ongoing from Michigan to Tennessee has led to record crests along parts of several major rivers.
A band of heavy snow will drop up to a foot of accumulation on parts of Iowa, Minnesota, Wisconsin and Michigan.
Ernesto will continue to track through the Caribbean into early this week before taking a turn toward the Belize and the Yucatan.
Moisture has been streaming northward into the southwestern quadrant of the U.S. over the last few days.