To some it looks like a flying saucer.

But those in the know will recognise it as a lenticular cloud.

Andrew Bowley was one of those who spotted it. He took a picture of it over College Estate, Hereford.

According to the Met Office these sorts of clouds sometimes form downwind of hills or mountains.

They look similar to the traditional shape of flying saucers in science fiction, and are believed to be one of the most common explanations for UFO sightings across the world.

They are formed when air blows across a mountain range, and in certain circumstances sets up a train of large standing waves in the air downstream, like ripples forming in a river when water flows over an obstruction.

If there is enough moisture in the air, the rising motion of the wave will cause water vapour to condense, forming the unique appearance of lenticular clouds.

We have included in our gallery some other recent cloud pictures that have got people talking.

Have you spotted some unusual cloud shapes recently? Upload your pictures below.