Most likely it was what is known as a hole-punch cloud.
最有可能的是所谓冲孔云。
The cloud's round shape is likely what is known as a hole-punch cloud.
云的圆形很可能就是人们所称的穿洞云。
Hole punch clouds: This picture taken of Rural West Virgina shows cloud cover to the top left.
穿洞云：这幅拍摄西弗吉尼亚乡村地区的图片展示了左上角覆盖上空的云层。
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