What cloud is it?
stratus
cumulus
cumulonimbus
cirrostratus
Cumulonimbus, from the Latin cumulus ("storm cloud"), is a dense, towering vertical cloud associated with thunderstorms and atmospheric instability, forming from water vapor carried by powerful upward air currents. If observed during a storm, these clouds may be referred to as thunderheads. Cumulonimbus can form alone, in clusters, or along cold front squall lines. These clouds are capable of producing lightning and other dangerous severe weather, such as tornadoes.
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Answers by country
stratus
cumulus
cumulonimbus
cirrostratus
answers
Switzerland
89
Austria
31
Pakistan
11
the United States
70
Germany
181
Australia
15
the United Kingdom
42
Poland
7084
Greece
14
India
27