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Weather Disturbances

Weather Disturbances. What is a weather disturbance?. Depressions (lows), tropical storms…. Typhoons, hurricanes…. Thunderstorms, tornados…. Mid-Latitude Depression. Polar front + tropical front Start off with a stationary front. Mid-Latitude Depression.

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Weather Disturbances

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  1. Weather Disturbances

  2. What is a weather disturbance? • Depressions (lows), tropical storms…. • Typhoons, hurricanes…. • Thunderstorms, tornados….

  3. Mid-Latitude Depression • Polar front + tropical front • Start off with a stationary front

  4. Mid-Latitude Depression • Westerlies push front into counter-clockwise rotation • At the end, occluded front occurs

  5. Mid-Latitude Depression • Significant amounts of rain • In winter, can cause snowstorms or freezing rain

  6. Thunderstorm/Hailstorm • Warm, moist air forced upward • Severe updrafts and downdrafts within cumulonimbus

  7. Thunderstorm/Hailstorm • Water droplets caught in circulation can turn into hail

  8. Thunderstorm/Hailstorm • Lightning – discharge of electricity • Thunder – lightning superheats air around it, produced a shockwave

  9. Hurricanes • North America: hurricanes • Indian Ocean: Cyclones • China Sea: Typhoons

  10. Hurricanes • Distinctive eye feature (15-50km wide)

  11. Hurricanes • Require warm air and large body of warm water to develop

  12. Hurricanes • Strong winds can pile seawater in a storm surge • Moves slowly, lasts for days

  13. 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

  14. Tornados • Most violent • Winds +500km/hr

  15. Tornados • Very low air pressure • Often generated where polar air meets maritime tropical • Often has hail, rain, lightning

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