Weather Disturbances
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Transcript of Weather Disturbances
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Weather Disturbances
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What is a weather disturbance?•Depressions (lows), tropical storms….
•Typhoons, hurricanes….
•Thunderstorms, tornados….
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Mid-Latitude Depression•Polar front + tropical front
•Start off with a stationary front
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Mid-Latitude Depression•Westerlies push front into counter-clockwise rotation
•At the end, occluded front occurs
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Mid-Latitude Depression•Significant amounts of rain
•In winter, can cause snowstorms or freezing rain
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Thunderstorm/Hailstorm•Warm, moist air forced upward
•Severe updrafts and downdrafts within cumulonimbus
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Thunderstorm/Hailstorm•Water droplets caught in circulation can turn into hail
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Thunderstorm/Hailstorm•Lightning – discharge of electricity
•Thunder – lightning superheats air around it, produced a shockwave
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Hurricanes•North America: hurricanes
•Indian Ocean: Cyclones
•China Sea: Typhoons
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Hurricanes•Distinctive eye feature (15-50km wide)
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Hurricanes•Require warm air and large body of warm water to develop
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Hurricanes•Strong winds can pile seawater in a storm surge
•Moves slowly, lasts for days
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Hurricanes•Given names to prevent confusion
•Started in 1953, 6 lists of alphabetical names
•Only time a change made to list is when hurricane is particularly destructive
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Tornados•Most violent
•Winds +500km/hr
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Tornados•Very low air pressure
•Often generated where polar air meets maritime tropical
•Often has hail, rain, lightning