Keratan info: They are most common when an advancing storm front causes moist air to rise, then cool to the point where it becomes a cloud known as the dew point.
When this happens along a front, a roll cloud can form, often with air actually circulating along the horizontal axis of the cloud.
Although it looks like a sideways tornado, these clouds cannot become one.
Photographer Daniela Eberl took this snap at Las Olas Beach in Maldonado, Uruguay.
Nota : Mulanya saya ingat imej photoshop ke apa ni. Then saya pergi cari kat youtube ada banyak video awan ni. Imej dari Nasa pun ada. Subhanallah. Kejadian berlaku awal Januari 2010 yang lalu. Info atas ni bertarikh 6 Jan-maybe it's happened on 5 Jan 2010.Subhanallah Maha Suci Allah, Allah Hu Akbar.