Word: thunderstorms
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Dates: during 1950-1959
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...nuclei are present, snowflakes form on them at a comparatively low level. This condensation releases heat, which makes the air rise faster. The resulting turbulence tears the snowflakes apart. The fragments grow into larger flakes, releasing still more heat. The meteorological "chain reaction" turns the cloud into a violent thunderstorm that dashes torrents of rain on the ground below...