Anvil cloud: At the highest level of a mature thunderstorm, an anvil cloud will form. It is a flat, white cloud that spreads horizontally once it reaches the stratosphere and can no longer grow ...

Positive strikes are the most dangerous because they strike from the anvil cloud, many miles away from the parent thunderstorm.

That cloud is popularly known as an anvil cloud, because of its shape. The technical name for this type of cloud is cumulonimbus incus. It is often associated with lightning and heavy rain or hail.

Did you see a unique-looking cloud over the Houston area on Thursday? Meteorologist Chita Craft explains what you were seeing.

Some viewers may have seen mammatus clouds on the backside of the storms that rolled through yesterday evening, let's take a quick look at how those interesting cloud structures form.

New analysis based on simple equations has reduced uncertainty about how clouds will affect future climate change.

A new analysis based on simple equations has reduced uncertainty about how clouds will affect future climate change.

Mammatus clouds offer a dazzling sight in the sky and usually cause quite the photography frenzy, as evidenced by our inboxes here at the station whenever they make an appearance. They are fairly ...

Mammatus clouds are the billowy clouds that can sometimes form on the underside of a thunderstorm’s anvil cloud.

Dear Tom,I have seen cumulonimbus clouds (thunderheads) with classic anvil formations at the top. What air mass is above the anvil causing it to flatten?Scott, Bloomingdale, Ill. Dear Scott, The tr… ...