Cloud Chart

Cloud Chart thumbnail H1 clouds - Filaments of Ci H2 clouds - Dense Ci in patches H3 clouds - Anvil shaped Dense Ci H4 clouds - Hooked shaped Ci H5 clouds - Cs not reaching 45° altitude H6 clouds - Cs exceeding 45° altitude H7 clouds - Veil of Cs H8 clouds - Cs not increasing or covering entire sky H9 clouds - Cc alone or main cirriform cloud M1 clouds - Thin As M2 clouds - Thick As covering the sun or moon, or Ns M3 clouds - Thin Ac at single level M4 clouds - Thin Ac in patches M5 clouds - Thin Ac in bands usually thickening M6 clouds - Ac from spreading Cu or Cb M7 clouds - Double layered or thick Ac or Ac with As and/or Ns M8 clouds - Ac in form of Cu-shaped turrets M9 clouds - Ac of a chaotic sky, usually at different levels L1 clouds - Cu of fair weather L2 clouds - Cu of considerable development L3 clouds - Cb with tops lacking clear-cut outlines L4 clouds - Sc formed from spreading Cu - bases at same level L5 clouds - Sc NOT formed from Cu L6 clouds - St or StFra (stratus fractus) but with no bad weather L7 clouds - StFra and/or CuFra of bad weather L8 clouds - Cu and Sc with bases at different levels L9 clouds - Cb with cirriform top Cumulonimbus mamatus Tornadoes Wall Cloud Shelf Cloud Wave Clouds

M1 Clouds: Thin altostratus (As)


Cloud code

M1

Cloud symbol
Symbol for M1 cloud
Cloud description
Altostratus, the greater part of which is semi-transparent; through which the sun or moon may be weakly visible as through ground glass.
M1 cloud
Additional Views:
M1 cloud thumbnail
Another M1 cloud image

Notes: Thin altostratus usually evolves from the gradual thickening of a veil of cirrostratus. This means that unlike most clouds which increase in height as they grow, altostratus (and nimbostratus) grow as the base of the cloud lowers.

Altostratus is grayish or bluish color, never white, and the greater part is always translucent enough to reveal the sun (or moon) as through ground glass. Objects on the ground do not cast shadows, and halo phenomena are never seen.

Click symbols (below) for more cloud types
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High
Clouds		 Symbol for H1 cloud Symbol for H2 cloud Symbol for H3 cloud Symbol for H4 cloud Symbol for H5 cloud Symbol for H6 cloud Symbol for H7 cloud Symbol for H8 cloud Symbol for H9 cloud
Mid
Clouds		 Symbol for M1 cloud Symbol for M2 cloud Symbol for M3 cloud Symbol for M4 cloud Symbol for M5 cloud Symbol for M6 cloud Symbol for M7 cloud Symbol for M8 cloud Symbol for M9 cloud
Low
Clouds		 Symbol for L1 cloud Symbol for L2 cloud Symbol for L3 cloud Symbol for L4 cloud Symbol for L5 cloud Symbol for L6 cloud Symbol for L7 cloud Symbol for L8 cloud Symbol for L9 cloud

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