Dark thunderstorm clouds form over Merligen, Switzerland warning you of an upcoming thunderstorm. The picture was taken in August, 2008.
Clouds form over Saint Quay sending a warning of an impending thunderstorm. The subsequent thunderstorm caused a lot of damage back in June, 2007.
Breathtaking view of thunderstorm clouds forming in the Grand Canyon over the south rim in Arizona.
The clouds form before a heavy thunderstorm outside the city of Las Vegas on a hot summer night.
A thunderstorm rolling through Sydney, Australia. The picture is taken with a Canon 40d, 17-40 mm f4L lens at 17mm, exposed at f4.0 for six seconds.
A beautiful but frightening view of a thunderstorm in progress. This picture is captured from Janes Island State Park, Maryland.
Thunderstorm with lightning in progress in Engelsdorf, Liebenau, Austria. The lightning brightens up the sky. Picture taken in July, 2008.
Dangerous clouds form amid approaching thunderstorm in Uttsville, PA. Take a note of how low the clouds are. Picture taken in June 2007.
Thunderstorm front formation over Lake Michigan. The picture is captured from Door County, Wisconsin.
Dark thunderstorm clouds ready to burst, loom over the downtown of the City of Bogota, Colombia.
A new year day thunderstorm created a havoc in San Francisco, California. The picture showing fallen tree braches.
Late November thunderstorm approaching Las Vegas, Nevada. The picture showing reddish brown clouds was taken in November, 2007.
A furious thunderstorm in progress. Note the lightning in the dense dark clouds in the picture. The picture was taken in August, 2007.
Dense Thunderstorm clouds form over Lake County in Florida. The picture was taken with an Olympus Camera.
