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Extreme weather and my weather report

الأسبوع 21 · الوحدة الثالثة، المفهوم 2.3 (ج): الظواهر الجوية القاسية ومشروع «تقارير خبراء الأرصاد الجوية» · 3 دروس
3

My five-day weather report

Science P6: Term 2, Unit 3, pp. 32–36
GoalRecord real weather for five days, compare it with a forecast and explain what the results show.
New words
forecast · a prediction of the weather to comedata table · a table where we record measurementssea level · the height of the sea surface
Explanation

A meteorologist compares forecasts with real weather to see how good the forecast was. You can do the same for five days. First, a grown-up finds a five-day forecast for your town. Then, starting on the same day, you record the real temperature, rain, wind and a word such as sunny or cloudy in a table. After five days, compare each day: did the forecast match what really happened? Forecasts are usually better for tomorrow than for five days away, because small errors grow. Your own measurements are evidence, so write what you saw, not what you hoped. There is also a long-term problem. Over many years the world is slowly getting warmer, ice melts and warm sea water expands, so sea level rises a little. Low coasts, such as parts of Egypt’s northern coast, may face more flooding in the future. Scientists and engineers are studying this and planning ways to protect coasts.

Day 1Day 2Day 3
Forecastsunny, 28cloudy, 26rain, 22
Realsunny, 29sunny, 27cloudy, 24
Worked examples
Look at the table: on Day 3 the forecast said rain, but it was only cloudy. The forecast was wrong for that day, but right about the cooler weather.
Day 1ForecastRealDifference
Temperature30322
Youssef’s forecast says 30 degrees on Day 1. His thermometer in the shade shows 32. The difference is 2 degrees. He writes both numbers.
Why must Youssef start recording on the same day the forecast starts? So that each forecast day matches the real day.
Class activity

My five-day weather report. With a grown-up, find a five-day forecast and copy it into a table with columns for temperature, rain, wind and a weather word. Over the next five days, write the real weather in a second row. Never look at the Sun. Circle the days when the forecast was close. Write two sentences about how good it was.

Practice
1
Why compare a forecast with real weather?
2
What four things can you record each day?
3
What happens to sea level when ice melts and warm water expands?
4
A forecast says 25 degrees and the real temperature is 27. What is the difference?