This amazing picture shows a rare phenomenon
called a roll cloud which tend to form ahead of a
cold front and can stretch for miles.

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.

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