Federal authorities say warmer-than-average temperatures and no rainfall are deepening a drought that's sparking forest fires across the Southeastern U.S., forcing people to evacuate dozens of homes.

Thursday's national drought report shows 41.6 million people in parts of 15 southern states now live in drought conditions. The worst is in Georgia, Alabama, Mississippi and Tennessee, but extreme drought also is spreading into western North and South Carolina.

Most of the large fires Thursday are being fought in Tennessee and Kentucky.

In the Appalachian Mountains of North Carolina, people living on five roads near one roaring blaze were advised to leave their homes, and residents of 38 more homes in another part of the state were told to evacuate ahead of a separate wildfire.