The photo above showing a sensational display of lenticular clouds was snapped near La Rioja, Argentina, at the base of the Andes Mountains, on September 9, 2011. I was doing seismic testing just after sunrise and was taken aback by the gold and tawny wave clouds that appeared across much of the sky. Photographer: Hector Fabian Garrido
The daredevil skiers performed a series of impressive stunts above the clouds. Jumping thousands of feet into the air with the clouds beneath their feet, off Mount Hood in Oregon, USA. Photographer Tyler Roemer
When I first spotted this storm, 17 mi (27 km) north of Fort Morgan, Colorado, it appeared to be a mesacyclone. However, by the time I gathered my photography equipment and drove toward it, I could tell that it had changed quite a bit and was no longer so threatening. Photographer: Debi Bratrsovsky; Debi’s Web site
How does a hurricane form? Although a complete picture is still being researched, insight into this process might be gleaned by watching the above time lapse movie of the formation of Hurricane Irene, a large storm system currently threatening the eastern seaboard of the USA.
It looks like a rainbow, but the colourful spectacle is actually a rare weather phenomenon called a sundog. It is caused when the sun refracts through hexagonal-shaped ice crystals that have formed in clouds. Photographer Robert Arn, spotted the scene in Heyworth, Illinois.
Sometimes it’s night on the ground but day in the air. As the Earth rotates to eclipse the Sun, sunset rises up from the ground. Therefore, at sunset on the ground, sunlight still shines on clouds above. Under usual circumstances, a pretty sunset might be visible, but unusual noctilucent clouds float so high up they can be seen well after dark. Photographer Greg Scratchley