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发布时间：2006-07-01 08:46     点击：

the weather forecast right away？

　　Well, you Can. The forecast is written in c1ouds. If you can read

that writing，you can tell something about the atmosphere. With some

practice， you can become a pretty good weather forecaster．Who knows，

you might even do as well as meteorologists.

　　Meteorologists use much more information than just the appearance of

the clouds to make their forecast．They collect data from all over the

world． Then they put it into powerful，high-speed computers.

　　This does give meteorologists an advantage，because they can track

weather patterns as they move from west to east across the country.

　　But you have an advantage，too.You can look at the sky and get your

data directly．A meteorologist uses a computer forecast that’s several

hours old to make a 1ocal forecast.

　　What are you seeing when you look at a cloud？”A picture of what

moisture is doing in the atmosphere,” says meteorologist Peter Leavit ．

There’s moisture throughout the atmosphere. Most of the time you don't

see it，because it's in the form of an invisible gas called water vapor.

　　Sometimes，the temperature of the air gets cold enough to cause the

water vapor to change to liquid water．That’s called condensation， and

we see it happen all the time (for example，when humid air from the

shower hits the cold glass of a mirror). When enough water vapor

condenses，droplets form in the air.These droplets scatter light．A cloud is seen.

　　Watching c1ouds over a day or two tells you a lot more than a sing1e

cloud about the weather to come， Changes in clouds show changes in the

atmosphere.

　　You should begin to notice patterns. Certain clouds， fol1owing each

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