Just about the time that Kenneth Arnold lost sight of his objects, Fred Johnson, listed as a prospector, reported watching 5 or 6 disk shaped craft as they flew over the Cascade Mountains.
He said they were round with a slight tail and about 30' in diameter. They were not flying in any sort of formation and as they banked in a turn, the sunlight flashed off them.
As they approached, Johnson noticed that his compass began to spin wildly.
When the objects finally vanished in the distance, the compass returned to normal.