These tunneling clouds in the skies are... long

The Morning Glory cloud is a special cloud that forms at altitudes of up to two kilometres and stretches for as long as 1,000 kilometers long.

It happens when flowing, moist and cool air meets the inversion layer where air temperature atypically increases with height.

This photo was taken by photographer Mick Petroff from his airplane near the Gulf of Carpentaria, Australia in 2009.