Mammatus clouds above Woodward Oklahoma in June 2012

Don't go on the Eiffel Tower during a thunder storm. It is still quite cool.

The higher the clouds, the more chance of a tornado. Read an article on cumulous cloud formations, and I recall this from that article.

Thick cumulonimbus builds on the plains of red barn in Ellis County Kansas.

lightning strikes a tree, notice the leader on the left side of the main lightning bolt.

Mammatus clouds

.Amazing

Camille Seaman captures the most incredible clouds.

Clouds in the sky? Reflection

Mammatus clouds over Nebraska

storm approaching

Mammatus clouds above northwestern Oklahoma in June, 2012

A rare cloud formation called a mammatus, where clouds take on a bubble-like shape, appeared in the skies above Regina, Saskatchewan in Canada following a thunderstorm on June 26.

A rare cloud formation called a mammatus, where clouds take on a bubble-like shape, appeared in the skies above Regina, Saskatchewan in Canada following a thunderstorm on June 26 [2012 ?], Photo courtesy of Preston Smoke/CBC.CA (Linda)

Severe thunderstorm with lightning approaches a wind farm near Dodge City, Kansas on March 18, 2012. Jim Reed, photographer.

Chile's Puehue Volcanic Eruption June 5, 2011

Nothing more western than a windmill and a good ol' thunderstorm.

testiculatus Clouds during our chase near Chappell, Nebraska (22nd June 2012). Photo by Camille Seaman

stormy night

Mammatus cloud and storm front

A lightning bolt strikes through a rainbow during a thunderstorm