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canvas prints cumulonimbus canvas prints thundercloud canvas prints thunderstorm cloud canvas prints precipitation canvas prints rain canvas prints snow canvas prints hail canvas prints sky canvas prints meteorology canvas prints illustration canvas prints diagram canvas prints cloud types canvas prints cloudy canvas prints convection current canvas prints convection currents canvas prints

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Illustration of a cumulonimbus hail storm cloud. Hail is a form of precipitation made up of balls of ice and snow. Hail forms in cumulonimbus clouds due to the violent convection currents present (blue and red arrows). Particles of rain or snow are drawn vertically up through the cloud and collide with supercooled water and other particles. These collisions lead to the particles sticking together. When they become too heavy to be supported by the air currents, they fall to earth. Some hailstones can be over 10 centimeters across.