SALT LAKE CITY—Two Blackhawk helicopters crashed within a few hundred yards of a Utah ski resort Tuesday morning during a training exercise as skiers on a nearby lift watched a huge cloud of snow billow into the air. Amazingly, none of men and women aboard the helicopter or the dozens of skiers nearby were injured, authorities said. Utah National Guard spokesman Jared Jones said that the crash occurred during a standard training exercise on U.S. Forest Service land just outside the boundaries of Snowbird Ski Resort, about 28 miles from Salt Lake City. Joseph Schafer, a 23-year-old from Provo, heard the thud. He said it sounded similar to the blast noise from the explosives ski patrols set off to control avalanches, but realized it was a crash when he saw a helicopter’s rotor fly out of the cloud of powder. He was thankful nobody was seriously hurt, but said skiers …