Lenticular clouds are stationary lens-shaped clouds that form at high altitudes, normally aligned at right-angles to the wind direction.

Lenticular clouds are stationary lens-shaped clouds that form at high altitudes, normally aligned at right-angles to the wind direction.

Lightning branches out from behind a veil of ash clouds at Iceland's Eyjafjallajökull volcano in April 2010

Lightning branches out from behind a veil of ash clouds at Iceland's Eyjafjallajökull volcano in April 2010

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