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UNSW : UNSW Atmosphere Study Guide
Atmosphere Study Guide 9 Bolt from the blue A lightning bolt strikes the ground beneath an isolated supercell at sunset near Medicine Lodge, Kansas. A supercell is a long-lived (greater than one hour) storm that feeds off an intense rotating updraft called a mesocyclone. Most large and violent tornadoes come from supercells. Break the ice Rain and hail originate from cloud droplets or ice crystals that form around microscopic particles, such as dust. Hail forms when an ice crystal is caught in the up-draught of a thunderstorm and grows rapidly by capturing super-cooled water. Large hailstones cycle around the cloud many times in order to reach their size. Smash and grab Extreme weather photographer Mike Theiss clutches a road sign during Hurricane Katrina in Gulfport, Mississippi on 29 August 2005. Hurricane Katrina was the deadliest storm ever to hit the U.S ., with a death toll of more than 1,800. It was also the sixth strongest hurricane ever recorded in the world, causing an estimated US$75 billion in damage. Engage