单词	cirrostratus
释义	cirrostratus /ˌsɪrəʊˈstrɑːtəs / /ˌsɪrəʊˈstreɪtəs/ noun [mass noun] Cloud forming a thin, more or less uniform semi-translucent layer at high altitude (usually 5 to 13 km, 16,500 to 45,000 ft).The cloud most suited to halo formation is cirrostratus, which is most commonly observed well ahead of a developing frontal system.... Halos form when light from the sun or moon is refracted by ice crystals associated with thin, high-level clouds (like cirrostratus clouds). Stratosphere air contains little water vapor or dust; only wispy cirrostratus clouds streak the distant sky. Rhymes altostratus, nimbostratus, stratus
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