Also known as cirrus spissatus cloud, Ci spi, cirrus densus, cirrus nothus, thunderstorm cirrus, false cirrus
cloud species unique to the genus cirrus, of such optical thickness as to appear grayish on the side away from the sun, and to veil the sun, conceal its outline, or even hide it
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密卷云（学名：Cirrus spissatus，缩写： Ci spi )，是卷云的一种。密卷云呈现出斑块状，且较为稠密，朝向太阳的一侧呈现灰色。密卷云在太阳下方经过时，太阳的轮廓会变得模糊。厚度足够大的密卷云甚至能将太阳完全遮蔽。密卷云通常产生自积雨云上部云层的分离。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).