Spectacular undulatus clouds over Mt. Triglav, Slovenia on April 7

While ascending Mt. Triglav, the highest peak of the Julian Alps and Slovenia (2864 m), Simon Petrič captured these amazing undulating clouds. The clouds formed due to forced lifting as strong southwesterly winds hit Mt. Triglav. Note the amazing speed of the airflow over the mountain.

Mr. Petrič also captured these fine photographs of the event:

For more of his photographs visit his Facebook account.