Tornado chasers there spent seven hours and 150 miles (240 kilometers) tracking the supercell thunderstorm that produced this cloud formation.

那里的龙卷风追风人历经七小时，行程240公里，追逐这个由超级单体雷暴形成的云体，拍下了精彩的图片。

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There were many chasers in the field that day.

CNN: Why we chase storms

Oklahoma is considered the "mecca of storm chasing, " Tim Samaras told National Geographic just last month, and there are often hundreds of storm chasers lining the roads.

NPR: Storm Chasing Critical, Profitable And Dangerous

"There are aspects of it where storm chasers and storm trackers are always going to play a vital role in the warning process, " Armstrong said.

NPR: Storm Chasing Critical, Profitable And Dangerous