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Forms of Severe Weather Thunderstorms • Occur when warm, moist air rises quickly • Forms cumulonimbus clouds • Drops collect, fall as rain, causing downdrafts of air (heavy winds) as well Lightning • Rapid rising of air causes clouds to build up charge • When charge jumps from cloud to cloud or from cloud to ground, it makes a lightning bolt • Heats air to around 30,000°C (hotter than the sun) • Quickly expanding air is heard as thunder Thunderstorm Videos • https://www.youtube.com/watch?v=jM8h60S1GsM • https://www.youtube.com/watch?v=LF1WhJJTDDY Tornadoes • Violent, whirling wind that moves in a narrow path • Occurs along fronts • Wind blowing at different speeds causes rotation to start • Combine with an updraft of air, you have a tornado Tornado Videos • Scales • https://www.youtube.com/watch?v=0G0UrkAsecY • https://www.youtube.com/watch?v=7KDz6dGQ5RE Hurricanes • Most powerful of all storms • Large, swirling low pressure systems forming over tropical ocean • Powered by warm, moist ocean air Hurricane Videos • https://www.youtube.com/watch?v=zP4rgvu4xDE • Difference Between Hurricane and Tornado • https://www.youtube.com/watch?v=W0LskBe_QfA Warning vs Watch • Severe weather watch • Stay tuned, and make preparations • Conditions are favorable • Severe weather warning • Take shelter, it’s here