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Winds and storms
Содержание
- 1. Winds and storms
- 2. Wind is the movement of air parallel
- 3. In the Northern Hemisphere, for example, northwest
- 4. STORMSA storm is a disturbed state of
- 5. Thunderstorms When hot, moist air is carried
- 6. Windstorms Meteorologists and mariners consider winds to
- 7. Sandstorms Sandstorms and dust storms are dry
- 8. Слайд 8
- 9. Cyclones, hurricanes, and tornadoes The word cyclone
- 10. Cyclones often cover thousands of square miles. The swift winds often bring heavy rain.
- 11. A cyclone is a storm or system
- 12. A tornado is a violent, inland cyclonic
- 13. Tornadoes can tear the roofs from houses.
- 14. Ice storms bring strong winds with ice, cold water and snow.
- 15. Скачать презентанцию
Wind is the movement of air parallel to the Earth's surface. Winds are named according to the direction from which they are blowing. The direction of a wind is significant in
Слайды и текст этой презентации
Слайд 3In the Northern Hemisphere, for example, northwest winds usually indicate
colder, drier weather. Easterly winds mean cloudiness and precipitation, and
southerly winds mean warm, humid weather.
Слайд 4STORMS
A storm is a disturbed state of the atmosphere. It
is marked by strong winds, rain, sleet, hail, and lightning.
Thunderstorms, windstorms, and cyclones are different types of storms.
Слайд 5Thunderstorms
When hot, moist air is carried to great heights by
the strong updraft in a rain-bearing cloud, the water vapor
condenses. Then heavy rain, thunder, and lightning occur along with strong wind, and sometimes hail. This is a thunderstorm.
Слайд 6Windstorms
Meteorologists and mariners consider winds to be at storm strength
when they reach a speed of 73 miles (117 kilometers)
per hour. Windstorms, or gales, have little or no precipitation.
Слайд 7Sandstorms Sandstorms and dust storms are dry windstorms. Sandstorms are associated
with desert areas. They occur when high winds lift particles
of sand into the air and drive them with great force.
Слайд 9Cyclones, hurricanes, and tornadoes The word cyclone or hurricane is frequently
used for any wind with a speed more than 75
miles (121 kilometers) per hour.
Слайд 11A cyclone is a storm or system of winds that
blows toward an area of low air pressure, over which
they rotate in an inward spiral.
Слайд 12A tornado is a violent, inland cyclonic storm. The tornado
has a funnel-shaped trunk that reaches down from a dark
thundercloud and whirls at speeds up to 300 miles (482 kilometers) per hour.
