Continued upward growth suggests showers later in the day. Species Cumulus mediocris (V-61) Moderate vertical clouds with flat medium grey bases and higher tops than cumulus humilis. Varieties Opacity-based varieties: None (always opaque) Pattern-based variety Cumulus mediocris radiatus (V-62)(V-60); Moderate cumulus clouds arranged in parallel lines that appear to converge at the horizon. Supplementary features Precipitation-based supplementary features: Virga Accompanied by precipitation that evaporates before reaching the ground. Praecipitatio Produces precipitation that reaches the ground. Cloud-based supplementary feature Mamma Downward facing bubble-like protuberances caused by localized downdrafts within the cloud. Accessory clouds Pileus; Small cap-like cloud over parent cumulus cloud. Velum A thin horizontal sheet that forms around the middle of a cumulus cloud. Mother clouds Genitus and mutatus types are the same as for cumulus of little vertical extent. Low-level stratocumuliform, cumuliform, and stratiform Low cloud forms from near surface to ca. and are generally composed of water droplets. Genus stratocumulus Abbreviation: Sc Clouds of the genus stratocumulus are lumpy, often forming in slightly unstable air, and they can produce very light rain or drizzle. Species Stratocumulus stratiformis Always dividable into opacity-based varieties. Sheets or relatively flat patches of stratocumulus Stratocumulus lenticularis (V-63) Lens-shaped low cloud. Stratocumulus volutus (V-64) Elongated, low-level, tube shaped, horizontal stratocumuliform cloud. Stratocumulus floccus (V-65) Scattered or isolated stratocumulus tufts with domed tops and ragged bases. Stratocumulus castellanus (V-66) Layer of turreted stratocumulus cloud with tower-like formations protruding upwards. Varieties Stratocumuliform opacity-based varieties Stratocumulus stratiformis translucidus (V-67) Thin translucent stratocumulus through which the sun or moon can be seen. Stratocumulus stratiformis perlucidus (V-68) Opaque low clouds with translucent breaks. Stratocumulus stratiformis opacus (V-69) Opaque stratocumulus clouds. Pattern-based variety radiatus Stratocumulus arranged in parallel bands that appear to converge on the horizon; normally associated with stratiformis species. Stratocumulus stratiformis translucidus radiatus (V-70) Stratocumulus stratiformis perlucidus radiatus (V-71) Stratocumulus stratiformis opacus radiatus (V-72) Pattern-based variety duplicatus Closely spaced layers of stratocumulus, one above the other; normally associated with stratiformis and lenticularis species. Stratocumulus stratiformis translucidus duplicatus (V-73) Stratocumulus stratiformis perlucidus duplicatus (V-74) Stratocumulus stratiformis opacus duplicatus (V-75) Stratocumulus lenticularis duplicatus (V-76) Pattern-based variety undulatus Stratocumulus with wavy undulating base; normally associated with stratiformis and lenticularis species. Stratocumulus stratiformis translucidus undulatus (V-77) Stratocumulus stratiformis perlucidus undulatus (V-78) Stratocumulus stratiformis opacus undulatus (V-79) Stratocumulus lenticularis undulatus (V-80) Pattern-based variety lacunosus Sc with circular holes caused by localized downdrafts; normally associated with stratiformis and castellanus species. Stratocumulus stratiformis translucidus lacunosus