" Clouds are defined as aggregates of innumerable tinny water droplets, ice particles or mixture of both in the air generally much above the ground surface ".

OR

" Clouds are masses of minute water droplets and/or crystals formed by the condensation of water vapour and held in suspension in the atmosphere ".

Clouds are of different types and they can be classified on the basis of their form and height :

(1) High Clouds (above 6 km)

(2) Middle Clouds (above 3-6 km)

(3) Low clouds (below 3 km)

(4) Multi-layer Clouds (Rainy Clouds)

► Alto-cumulus

• These are thick, fluffy, clouds that are a patchy white and grey in colour
• Indicate fine weather/sunny spells

► Alto-stratus

• Clusters of bluish-grey clouds indicates that there may be rain ahead
• Associated with the development of bad weather

(3) LOW CLOUDS

► Cumulus

• Also called " WOOL - CLOUDS ".
• They resembled the head of a Cauliflower.
• They occur mainly in summer and produced by convection
• They indicate sunny weather

► Stratus

• Bring dull weather
• Usually accompanied with a Drizzle 

► Strato-cumulus 

• Indicates fair and clear weather.

(4) MULTI-LAYER CLOUDS

► Nimbo-stratus

• These dark grey, rain or snow bearing clouds cover the sky so completely that one cannot see the sun
• They indicate a long spell of heavy rain or snow

► Cumulo-nimbus

• These clouds produces lightning, thunder, heavy rain, hail, strong wind and tornadoes
• The tallest among all clouds. 

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