TSV
Ten Cloud Genera - TSV
The Ten Cloud Genera is a fundamental cloud classification system established in the International Cloud Atlas published by the World Meteorological Organization (WMO). Based on the Latin nomenclature proposed by Luke Howard in 1803, it classifies clouds into ten genera according to their morphological characteristics. This classification serves as an international standard for meteorological observation worldwide and forms an essential foundation for weather forecasting and meteorological research.
meteorology
clouds
World Meteorological Organization
International Cloud Atlas
weather forecasting
atmospheric science
code slug name description altitudeRange level
Ci cirrus Cirrus Detached clouds in the form of white, delicate filaments with a silky sheen. Above 5,000m High-level cloud
Cc cirrocumulus Cirrocumulus Thin, white patch or layer of cloud composed of very small elements arranged regularly. Above 5,000m High-level cloud
Cs cirrostratus Cirrostratus Transparent, whitish cloud veil of fibrous or smooth appearance that produces halo phenomena. Above 5,000m High-level cloud
Ac altocumulus Altocumulus White or grey patch, sheet or layer of cloud with rounded masses or rolls. 2,000m - 7,000m Middle-level cloud
As altostratus Altostratus Greyish or bluish cloud sheet or layer that reveals the Sun as through ground glass. 2,000m - 7,000m Middle-level cloud
Ns nimbostratus Nimbostratus Grey cloud layer that causes continuous rain or snow and completely blocks the Sun. 2,000m - 7,000m Middle-level cloud
Sc stratocumulus Stratocumulus Grey or whitish patch, sheet or layer of cloud with dark parts and rounded masses or rolls. Below 2,000m Low-level cloud
St stratus Stratus Generally grey cloud layer with a fairly uniform base that may produce drizzle or snow. Below 2,000m Low-level cloud
Cu cumulus Cumulus Detached, dense clouds with sharp outlines developing vertically, with tops resembling cauliflower. Below 2,000m (base) Low-level cloud
Cb cumulonimbus Cumulonimbus Heavy and dense cloud with considerable vertical extent, with the top flattening into an anvil shape. Below 2,000m (base) to tropopause Low-level cloud