| 单词 | roll cloud |
| 释义 | > as lemmasroll cloud roll cloud n. Meteorology a low, horizontal, tube-shaped cloud associated with a cold front, thunderstorm gust front, or line squall, but detached from the main cloud mass. ΚΠ 1890 C. Abbe Preparatory Stud. Deductive Methods Storm & Weather Predict. 92 Roll clouds attend the advancing fronts of northers, blizzards, thunder-storms, Pamperos, Solanos, and other winds of this class. 1942 W. H. Wenstrom Weather & Ocean of Air xix. 418 Tornadoes may appear out of an exceptionally violent and fast-moving line squall, as the horizontal vortex of the roll cloud or squall head breaks away. 2004 Chicago Tribune (Midwest ed.) 13 June i. 20/1 The roll cloud is associated with the storm's strong, gusty, cool outflow winds. < as lemmas |
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