【Science】5th Grade: Changes in Weather
Hello! Let's study "Changes in Weather" together. From "Will it be sunny for our field trip tomorrow?" to "Oh no, it just started raining!"—weather is deeply connected to our daily lives. In this chapter, we will learn how weather changes and the rules behind those changes. It might feel a bit tricky at first, but this guide is packed with tips that will make looking up at the sky so much more fun. Let’s relax and get started!
1. The Relationship Between Cloud Cover and Weather
When you look up at the sky, the amount of clouds determines whether it is "sunny" or "cloudy." In science, we use the ratio of clouds to the entire sky (based on a scale of 10) to determine cloud cover.
- Sunny: Cloud cover of 2 to 8
- Cloudy: Cloud cover of 9 to 10
- Clear: Cloud cover of 0 to 1
【Pro Tip】
It’s surprising, right? Even if there are some clouds, it’s still considered "sunny"! In science, you don't need a completely blue sky to call it sunny; as long as there are few enough clouds, it counts.
【Common Mistake】
Many people think, "The sky is half-covered in clouds (5), so it must be cloudy!" But remember, if it's only half-covered, it’s still "sunny." It only becomes "cloudy" once the clouds cover almost the entire sky (9 or more).
💡 Section Summary:
Weather is determined by cloud cover. If 90% or more of the sky is covered in clouds, it's "cloudy"!
2. In Which Direction Does Weather Move?
Around Japan, there is a very important "rule of movement" for weather. Once you learn this, you'll be able to predict tomorrow's weather!
Weather Moves from "West to East"
In most cases, weather in Japan moves from west to east. For example, when it's raining in Fukuoka Prefecture (in the west), the rain often moves to Hiroshima, then Osaka, and finally to Tokyo (in the east).
【Think of it like this!】
Think of weather like a "train traveling from west to east." Whatever is happening at the station (city) in the west will likely happen at the station (city) in the east after a little while.
【Why West to East?】
High above Japan, there is a strong wind called the Westerly Wind that always blows from west to east. This wind pushes the clouds toward the east.
💡 Section Summary:
Weather in Japan moves from west to east. The reason? It’s the work of the Westerly Wind!
3. Observing Cloud Movement
To understand changes in weather, it's important to watch how clouds move. Besides using our own eyes, we also use some very helpful tools.
Weather Satellite "Himawari"
This is a camera watching Earth from space. It allows us to see the state of clouds all over Japan in a photo. As time passes, you can clearly see large masses of clouds moving from west to east.
AMeDAS (Automated Meteorological Data Acquisition System)
These are observation devices set up in many locations all over Japan. They automatically measure "rainfall," "wind speed," and "temperature." They help us accurately know "where and how much" it is raining.
🌟 Fun Fact: The Origin of the Name "Himawari"
The weather satellite "Himawari" (which means sunflower) was named because, just like the flower that always faces the sun, it is always watching over the Earth (Japan)!
💡 Section Summary:
Himawari watches clouds from space, while AMeDAS measures rain and other factors on the ground. Weather forecasts are created by combining both!
4. Let's Try Predicting the Weather!
Using what we've learned, here is how you can make your own prediction.
Step 1: Check the sky and news to the west!
Look at the weather in cities located further west than where you live using TV news or the internet.
Step 2: Watch the cloud movement!
Check the satellite photos from "Himawari" to see if any large clouds are approaching from the west.
Step 3: Consider the time!
Clouds typically travel hundreds of kilometers in a day. You can predict, "If it's raining in that city in the west this morning, it might reach my town by the afternoon!"
【Pro Tip】
Because of mountains or changing seasons, it doesn't always follow the rules perfectly, but the basic rule is "west to east"!
💡 Section Summary:
If you want to know about tomorrow, first look at the western sky and watch the cloud movement!
✨ Final Advice: How to Get Better at Science
You might get confused at first thinking, "Wait, was it west or east?" When that happens, just remember: "The sun rises in the east, but the weather comes from the opposite direction: the west!" That should help you remember.
Learning about weather changes makes looking at the sky much more fun. As you wonder, "Hmm, I wonder if that cloud will bring rain tomorrow?" make sure to observe the real sky. Let’s do our best, one step at a time!