Yesterday in Ireland, on one of the warmest days of the year so far, Dubliners were treated to a natural wonder.

Spotted In Dublin! http://t.co/4XqZyPuE8a pic.twitter.com/a4b0tmeKjx

— 98FM (@98FM) June 30, 2015

The skies above Dublin city filled with altocumulus lenticularis – clouds that bear a striking resemblance to flying saucers.

UFO Clouds are Awesome @LovinDublin @lecooldublin @DublinTown @DublinDiaries @dublin pic.twitter.com/N3xpjjdm7P

— Cathy Burke (@CloudBurke) June 30, 2015

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.

RT @LiveNaasWeather The day #Dublin came under siege of UFOS! Altocumulus Lenticularis Clouds! pic.twitter.com/XFDkcCFZDL

— Adrian Linares (@Adriansweather) June 30, 2015

Satellite imaging offered a birds-eye view of the clouds above Dublin yesterday.

High resolution visible satellite imagery of Dublin lenticular clouds from today. http://t.co/5gEfFlw1sr pic.twitter.com/UMAbty6WsE

— Tim Ballisty (@IrishEagle) June 30, 2015

The unique shapes the cloud formation takes on are thought to be one of the most common explanations for apparent UFO sightings.

Spectacular shot of todays #Lenticular #Clouds over Ballyfermot #Dublin 10 by Amanda Devlin. #Ireland pic.twitter.com/NQix5oraA3

— Kildare Weather (@LiveNaasWeather) June 30, 2015

Have you ever seen lenticular clouds in person? Let us know in the comment section, below.

 

The natural cloud phenomenon altocumulus lenticularis graced the skies above Dublin yesterday.Twitter / Kildare Weather @LiveNaasWeather