Tuba (cloud)

Clouds : classification
Genera Cirrus Ci Cirrocumulus Cc Cirrostratus Cs Altocumulus Ac Altostratus As Stratocumulus Sc Stratus St. Cumulus Cu Nimbostratus Ns Cumulonimbus Cb	species calvus cal capillatus cap castellanus cas congestus con fibratus fib floccus flo fractus fra humilis hum lenticularis len mediocris med nebulosus neb spissatus spi stratiformis st uncinus unc volutus vol	Subspecies duplicatus you intortus in lacunosus la opacus op perlucidus pe radiatus ra translucidus tr undulatus un vertebratus ve Special forms arcus arc asperitas asp cauda cau cavum cav fluctus flu flumen flm incus inc mamma mam murus mur pannus pan pileus pil praecipitatio pra tuba tub velum vel virga vir

Tuba ( Latin for "tube, wind instrument in ancient Rome with elongated tube and narrow bell ") denotes, according to WMO , a column or an inverted cone in a cloud that grows out of the cloud base . This makes a strong vortex movement visible (see Trombe ). This special form occurs with Cumulonimbus and less frequently with Cumulus .

Delimitation: A Tuba without ground contact is called funnel cloud ( Funnelcloud called).

Web links

• Karlsruhe Cloud Atlas: Cumulonimbus praecipitatio tuba
• Tuba . In: International Cloud Atlas of the World Meteorological Organization