A thin funnel cloud touches down in a field in northwest Iowa.

一个细细的漏斗云接近爱荷华州西北部的一块田地。

Then, all of a sudden, we've seen like a black funnel cloud.

然后，突然间，就看见像漏斗一样的黑云。

A tornado is accompanied by a high-speed rotation of the funnel cloud, in strong wind vortex.

龙卷风是一种伴随着高速旋转的漏斗状云柱的强风涡旋。

Short-band radar strays within a few miles of the developing funnel cloud and gets a good shot of the tornado itself.

波段（短波段）雷达，在距离漏斗云几英里的地方，就近观测龙卷风。

Officials say one funnel cloud measured 450 meters across as it moved through eastern Kansas and western Missouri, blowing roofs off homes and uprooting large trees.

官员们说，一块直径450米的漏斗云在穿越堪萨斯州东部和西部时，将房顶揭起、树木连根拔起。