Arcus cloud Arcus cloud An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus. Roll clouds and shelf clouds are the two main types of arcus. Arcus clouds most frequently form along the leading edge or "gust fronts" of thunderstorm outflow; some of the most dramatic arcus formations mark the gust fronts of derecho-producing convective systems. Roll clouds also may arise in the absence of thunderstorms, forming along the shallow cold air currents of some sea breeze boundaries and cold fronts. A shelf cloud is a low, horizontal, wedge-shaped arcus cloud. A shelf cloud
Cloud dragon Horrors" (2002) from Necromancer Games. The cloud dragon appeared in Paizo Publishing's book "Pathfinder Roleplaying Game Bestiary 2" (2010), on pages 96–97. Cloud dragon The cloud dragon, also known as the Draco Cumulus Welkin, is a type of dragon in the "Dungeons & Dragons" fantasy role-playing game. The cloud dragon first appeared in the first edition "Monster Manual II" (1983). The cloud dragon appeared in second edition for the Greyhawk setting in the "Monstrous Compendium Greyhawk Appendix" (1990), and is reprinted in the "Monstrous Manual" (1993). A cloud dragon is a neutrally aligned dragon which can take a gaseous form