It was the first Atlantic hurricane of the season, and the first to hit the mainland United States in two years.

© Zack Wittman for The New York Times

After making landfall in the Florida Panhandle as a Category 2 hurricane, Isaias weakened considerably and headed north. Now, parts of the Southeast are at risk of flash floods.

© Zack Wittman for The New York Times

After making landfall in the Florida Panhandle as a Category 2 hurricane, Isaias weakened considerably and headed north. Now, parts of the Southeast are at risk of flash floods.

© Zack Wittman for The New York Times