Yesterday in Ireland, on one of the warmest days of the year so far, Dubliners were treated to a natural wonder.
The skies above Dublin city filled with altocumulus lenticularis – clouds that bear a striking resemblance to flying saucers.
Lenticular clouds normally form perpendicular to the direction of the wind, in conditions where stable, moist air collides with mountains or large man-made structures.
Satellite imaging offered a birds-eye view of the clouds above Dublin yesterday.
The unique shapes the cloud formation takes on are thought to be one of the most common explanations for apparent UFO sightings.
Have you ever seen lenticular clouds in person? Let us know in the comment section, below.