pattern 模式
International Kite Festival
WEATHER FORECAST
• If you want to know what the weather will be like tomorrow, you can find a forecast in the newspaper, on TV, or on Internet. Until about 150 years ago, however, forecasts were made by people observing their surroundings. They paid a lot of attention to the clouds and the winds.
at least 至少
WEATHER
• Weather affects our lives in many different ways. Airline pilots know how fast and from what direction winds are blowing before they take off and land. People who fish are aware of storms brewing out at sea. Farmers wait for dry weather to start harvesting their crops.
TORNADO
TORNADO
• A tornado is a violent storm whose centre is a cloud in the shape of a funnel(漏斗). Tornados can always make very strong circular winds.
THE RESTLESS AIR
• Your alarm goes off. A new day begins. What will you wear? What will you do?
• Your answers depend on the weather.
WEATHER?
• You probably talk about the weather at least once every day. Just what is weather? In simple terms, weather is what is happening in the air around you.
affect 影响 harvest 收获 crop 庄稼
WEATHER or CLIMATE
• Weather is powered by the sun heating While weather changes from day to day, climate is a region’s general pattern of Earth. This heat energy is responsible for weather over a long period of time. creating different climates in different places on Earth.
• Winds inside a tornado may reach speeds of more than 400 kilometers an hour. A tornado may suck up cars, trees, and even buildings only to smash them back down to Earth. Tornados usually last less than ten minutes. However, they can leave behind a trail of severe destruction.
• Today, forecasting tomorrow’s or next week’s weather is the job of meteorologists (气象学家), scientists who study the weather. Modern weather forecasting depends on collecting enormous amounts of information—all around the world.
Afdo
ADVICE
• WEBSITE TO VISIT: • 1. National Weather Service:

• 2. The Weather Channel: