Kenneth Arnold sighting
A pilot reported nine crescent objects near Mt Rainier, coining 'flying saucers'.
1947 CE · 46.85, -121.76 · status: unexplained
The account
Businessman-pilot Kenneth Arnold described objects moving 'like saucers skipping on water'; a reporter's shorthand gave the era its name.
The sceptical view
Suggestions range from a formation of meteors to lenticular clouds or aircraft; the case launched the modern UFO age.
The researched reading
A sincere, prompt report by an experienced pilot, whose striking speed depends on an uncertain distance. Birds or aircraft at a closer range are the most likely explanation, but the case is not closed.
| Explanation | Weight | Why |
|---|---|---|
| Something known, misidentified | 40% | Arnold’s high speed depended on his estimate of the objects’ distance; if they were nearer, they could have been a formation of birds such as pelicans catching the light, or distant aircraft glinting in the sun, and he himself first thought they were jets. |
| Genuinely anomalous | 15% | An experienced mountain pilot timed the objects between landmarks in clear air and described an unusual shape and flight; no proposed explanation fits every detail. |
| Secret human technology | 13% | Flying-wing aircraft were under development (Northrop XB-35), but nine in formation near Mt Rainier with no record and at such speed is unlikely. |
| Perception, memory or mind | 12% | Distance and size judgments of bright points against snow are unreliable, and reflections on the cockpit glass can mislead; the "saucer" shape grew partly from press reporting. |
| A known natural phenomenon | 8% | Mirages over the mountain ridges, or snow blown off peaks, have been proposed. |
| A poorly understood natural phenomenon | 5% | A rare atmospheric optical effect cannot be ruled out. |
| Undetermined | 5% | The share a generic explanation had beyond what has been shown for this case: it fits many cases like this one, but has not been demonstrated for this one. |
| A hoax or fabrication | 2% | Arnold reported promptly, gained little, and kept to his account; fabrication is very unlikely. |
Official position: Project Blue Book listed it as a mirage in its files, while popular accounts treat it as the founding sighting of the UFO age.
How the account grew
Kenneth Arnold's 1947 report of nine fast, flat objects near Mount Rainier was first described as weaving 'like a saucer skipped across water'; headline writers turned that into 'flying saucers', and Arnold himself moved from hoping they were Army craft to calling them unearthly, while skeptics offered a string of shifting explanations.
| Year | Who | Added |
|---|---|---|
| 1947 | Kenneth Arnold; Bill Bequette and Nolan Skiff, East Oregonian | Nine shiny 'saucer-like' objects in echelon passing Mount Rainier at an estimated 1,200 mph, weaving 'like the tail of a Chinese kite'; he also calls them flat like a pie pan and somewhat bat-shaped. |
| 1947 | US newspaper headline writers | From 26–27 June the terms 'flying saucer' and 'flying disc' appear; hundreds of similar reports follow within weeks. (dropped: Arnold later says his 'saucer' comparison described the motion, not the shape.) |
| 1947 | Kenneth Arnold to AP and the Chicago Times | On 7 and 19 July he says that if they are not Army craft they may be from another planet. (dropped: His first hope that they were secret US aircraft.) |
| 1947 | Army Air Forces | Investigators find Arnold credible; the formal public conclusion is that he saw a mirage. |
| 1949 | Saturday Evening Post | Arnold is quoted saying the objects were aircraft of strange design and material 'unknown to the civilization of this earth'. |
| 1950 | Edward R. Murrow interview | Arnold says he has had three more sightings since 1947, now calling them spacecraft. |
| 1953 | Donald Menzel | Snow blown from mountain ridges; in 1963 he proposes wave clouds, and in 1971 water spots on the windows. (dropped: Each earlier Menzel explanation is replaced by the next.) |
| 1970 | Herbert Strentz | A study of press coverage concludes 'flying saucer' probably came from an editor or headline writer rather than from Arnold or Bequette. |
Connections in the atlas
- José Higgins, Bauru
- Kenneth Arnold’s report to the Army Air Forces
- Kenneth Arnold
- The Coming of the Saucers
- ▶ Jung and the modern myth
- Flying saucer
- Sluiskin and the summit of Takhoma
- The Twining memo
- Donald Menzel
- Kenneth Arnold’s sighting near Mount Rainier
- ▶ The government UFO files
- Portland flying discs, 4 July 1947