The National Park Service on Tuesday identified two men who died in catastrophic weekend flooding at the Grand Canyon as members of a three-person hiking group, one of whom is still missing.

Like clockwork, clouds build up in the afternoon, the wind starts to swirl and the skies darken.

The national park remained open Tuesday but tourists who planned to stay overnight — many traveling long distances for reservations from a year or more ago — have had to scramble to find rooms elsewhe...