Meteorology, Climate, and the Water Cycle

Weather is what the sky and air are like right now or on a certain day.

Weather can change from morning to afternoon, or from one day to the next. It tells us what is happening outside at a time and in a place.

For example, it might be sunny and warm at your school today. But it could be rainy and cool tomorrow. That is weather.

Weather is short-term. That means it is about what happens over a short time, like today, tonight, or this week.

We can describe weather by looking at a few important things.

• Temperature tells how hot or cold the air feels.
• Precipitation is water that falls from the sky, like rain or snow.
• Wind is moving air.
• Clouds show us what the sky looks like.

When we talk about weather, we can ask questions like these:

• Is it hot or cold?
• Is it sunny or cloudy?
• Is rain falling?
• Is the wind blowing?

Weather happens in a certain place. The weather in one town can be different from the weather in another town at the very same time.

For example, one place may have bright sunshine, while another place has dark clouds and rain. Both are kinds of weather.

Meteorology is the study of weather. A person who studies and talks about weather is called a meteorologist. Meteorologists help us know what weather may happen soon.

Let’s learn the main parts of weather more closely.

1. Temperature

Temperature tells us if the air is warm, cool, hot, or cold. On a hot day, you may wear shorts. On a cold day, you may wear a coat.

2. Precipitation

Precipitation is water that falls from clouds. Rain and snow are kinds of precipitation. If rain is falling today, that is part of today’s weather.

3. Wind

Wind is air that moves. A gentle wind may make leaves wiggle. A strong wind may push your hair or hat.

4. Clouds

Clouds help describe the sky. The sky can be clear, partly cloudy, or very cloudy. Cloudy skies can sometimes bring rain.

Weather words help us describe what we notice outside. We might say:

• It is sunny.
• It is cloudy.
• It is rainy.
• It is snowy.
• It is windy.
• It is warm.
• It is cold.

Sometimes weather has more than one part at the same time. A day can be cloudy and windy. Another day can be rainy and cool.

Here is an important idea: weather is about now. If someone asks, “What is the weather today?” they are asking about the air and sky conditions at this time and place.

Let’s look at some examples.

Worked Example 1

Tara steps outside in the morning. The sun is shining. She feels warm. No rain is falling.

What is the weather like?

Answer: The weather is sunny and warm.

We used what Tara noticed outside right then.

Worked Example 2

Ben looks out the window. The sky is gray. Rain is falling. The trees are moving because the air is blowing.

What is the weather like?

Answer: The weather is rainy, cloudy, and windy.

We described the precipitation, clouds, and wind.

Worked Example 3

In one city, children wear coats because the air is cold. In another city, children wear T-shirts because the air is warm.

Can the weather be different in different places at the same time?

Answer: Yes. Weather happens at a certain time and in a certain place. One place can be cold while another place is warm.

Worked Example 4

On Monday it is sunny. On Tuesday it rains.

Did the weather stay the same or change?

Answer: The weather changed.

Weather can change from day to day.

Now let’s think about what weather is not. Weather is not just one thing. It is not only rain, only wind, or only temperature. Weather includes many parts of the air and sky together.

Weather is also not forever. It changes. That is why we check the weather to know what it is like now or what it may be like soon.

You can observe weather by using your senses in a safe way.

• Look at the sky. Is it sunny or cloudy?
• Feel the air. Is it warm or cold?
• Listen. Do you hear wind or rain?
• Notice what falls from the sky. Is there rain or snow?

We can use these clues to describe the weather clearly.

Try It

1. If snow is falling and the air feels cold, the weather is snowy and cold.

2. If the sun is out and the air is moving, the weather may be sunny and windy.

3. If no clouds are in the sky and it feels warm, the weather may be clear and warm.

Remember:

• Weather tells what the air and sky are like.
• Weather happens at a certain time and place.
• Weather is short-term, like today or tomorrow.
• We describe weather with temperature, precipitation, wind, and clouds.

When you go outside, you can be a weather watcher. Look up, feel the air, and notice what is happening. Then you can tell the weather for your place at that time.

Atmospheric Temperature Tracking means watching how hot or cold the air is. We can do this by using a thermometer. A thermometer helps us measure air temperature.

Temperature tells us if the air feels warm, cool, or cold. When we track temperature, we check it again and again over time. This helps us notice weather patterns.

We can measure temperature during the day and at night. We can also measure it in different seasons, like summer and winter. Then we can compare what we see.

Introduction: What is a thermometer?

A thermometer is a tool that shows temperature with numbers. The numbers help us know how warm or cold the air is outside.

Some thermometers have a line that goes up and down. Some have a screen with numbers. No matter what kind it is, a thermometer helps us read the air temperature.

Main Teaching Point 1: Reading a thermometer

When we read a thermometer, we look at the number it shows. That number is the temperature.

A bigger number means the air is warmer. A smaller number means the air is cooler.

• If the thermometer says 80, the air is warmer.
• If the thermometer says 50, the air is cooler.

We can compare temperatures with math words:

• Greater than means warmer when we compare two temperatures.
• Less than means cooler when we compare two temperatures.

For example, \(70 > 60\). That means 70 is warmer than 60.

Main Teaching Point 2: Tracking temperature over time

Tracking means writing the temperature down each time we check it. We can make a simple temperature log.

A temperature log can tell us:

• if the day got warmer
• if the night got cooler
• if one day was warmer than another day

We can check the temperature at the same times each day, like morning and night. This helps us make a fair comparison.

Here is a simple way to log temperatures:

• Write the day.
• Write the time.
• Write the temperature number.

For example:

• Monday morning: 60
• Monday night: 50

Main Teaching Point 3: Day and night temperatures

During the day, the Sun helps warm the air. At night, there is no sunlight, so the air is often cooler.

This means the temperature is often higher in the day and lower at night.

But weather can change, so we use a thermometer to check instead of guessing.

Main Teaching Point 4: Seasonal temperatures

Seasons can change air temperature too.

• Summer is often warmer.
• Winter is often colder.
• Spring and fall can be in between.

When we track temperature in different seasons, we can see that temperatures do not stay the same all year.

Main Teaching Point 5: Comparing temperatures

We can compare two temperatures to see which is warmer or cooler. We can also find how much the temperature changed.

To find the change, we subtract the smaller number from the bigger number.

For example:

$$70 - 60 = 10$$

This means the temperature changed by 10 degrees.

Worked Example 1: Reading one thermometer

A thermometer shows 65. What is the air temperature?

Step 1: Look at the number.

The number is 65.

Answer: The air temperature is 65 degrees.

Worked Example 2: Comparing day and night

In the afternoon, the thermometer says 72. At night, it says 58. Which time is warmer?

Step 1: Compare the numbers.

\(72 > 58\)

Step 2: The greater number is warmer.

Answer: The afternoon is warmer.

Worked Example 3: Finding how much the temperature changed

In the morning, the temperature is 55. In the afternoon, it is 67. How much warmer did it get?

Step 1: Subtract the smaller number from the bigger number.

$$67 - 55 = 12$$

Answer: It got 12 degrees warmer.

Worked Example 4: Looking at seasons

One winter day is 40 degrees. One summer day is 85 degrees. Which season is warmer?

Step 1: Compare the numbers.

\(85 > 40\)

Answer: Summer is warmer.

Try These Ideas When You Track Temperature

• Check the thermometer at the same time each day.
• Write the number carefully.
• Compare today’s number to yesterday’s number.
• Look for patterns, like warmer days and cooler nights.

Why temperature tracking is useful

Tracking temperature helps us understand weather. It helps us know if the air is getting warmer or cooler.

It also helps us notice patterns over many days. We may see that afternoons are often warmer than mornings. We may also see that winter temperatures are often lower than summer temperatures.

Brief Summary

A thermometer measures how hot or cold the air is. We can track temperature by writing down the number at different times, like day and night, or in different seasons.

When we compare temperatures, bigger numbers mean warmer air and smaller numbers mean cooler air. Tracking temperature helps us learn about daily weather and seasonal changes.

Precipitation Variants are the different kinds of water that fall from the sky.

When water falls from clouds, it is called precipitation. Precipitation can look different depending on how warm or cold the air is.

In this lesson, we will learn about four kinds of precipitation:

• rain
• snow
• sleet
• hail

Let’s learn how each one forms and how to tell them apart.

1. Rain

Rain is liquid water that falls from clouds. Rain happens when the air is warm enough so the water does not freeze.

Rain looks like drops of water. It can be light, like a sprinkle, or heavy, like a big storm.

If you go outside and feel wet drops that are not frozen, that is rain.

2. Snow

Snow is frozen water that falls from clouds. Snow happens when the air is cold.

Snow falls as soft flakes. Snowflakes can look tiny and light. They can cover the ground in white.

If the air stays cold, the snow does not melt before it reaches the ground.

3. Sleet

Sleet is made of small ice pieces. It is not soft like snow and not wet like rain.

Sleet can happen when water falls through cold air and freezes into little ice bits before it lands.

If you hear tiny icy taps and see little frozen pieces falling, that may be sleet.

4. Hail

Hail is made of balls or lumps of ice. Hail is usually harder and bigger than sleet.

Hail forms in storm clouds. Strong winds push ice up and down inside the cloud. More ice builds up, and then the hail falls when it gets too heavy.

Hail can be very small or sometimes much bigger. Hail is hard ice, not soft flakes.

How Temperature Changes Precipitation

The big idea is this: temperature matters.

• If the air is warm, water falls as rain.
• If the air is cold, water can fall as snow.
• If water freezes into tiny ice pieces, it can fall as sleet.
• If ice grows into hard balls in a storm cloud, it falls as hail.

You do not need to know exact numbers. Just remember: warmer air makes rain more likely, and colder air makes frozen precipitation more likely.

Ways to Tell Them Apart

• Rain: wet drops of liquid water
• Snow: soft, white flakes
• Sleet: tiny ice pieces
• Hail: hard balls or lumps of ice

Worked Example 1

The sky is cloudy. Water falls in wet drops. Your coat gets wet. The drops are not frozen.

What kind of precipitation is it?

It is rain.

Why? Rain is liquid water. Wet drops that are not frozen are rain.

Worked Example 2

It is a very cold day. Soft white flakes fall from the sky and cover the grass.

What kind of precipitation is it?

It is snow.

Why? Snow falls as soft flakes when the air is cold.

Worked Example 3

You hear little icy clicks on the window. Tiny frozen pieces are falling. They are not soft like snow.

What kind of precipitation is it?

It is sleet.

Why? Sleet is made of small ice pieces.

Worked Example 4

A storm cloud is overhead. Hard balls of ice fall to the ground.

What kind of precipitation is it?

It is hail.

Why? Hail is hard ice that forms in storm clouds.

Let’s Compare

1. Rain is liquid.
2. Snow is soft and frozen.
3. Sleet is tiny frozen ice pieces.
4. Hail is hard ice balls or lumps.

Quick Check

• If it is warm and wet drops fall, it is rain.
• If it is cold and soft flakes fall, it is snow.
• If little ice pieces fall, it is sleet.
• If hard ice balls fall in a storm, it is hail.

Summary

Precipitation is water that falls from clouds. It can fall as rain, snow, sleet, or hail.

The kind of precipitation depends on how warm or cold the air is. Warm air gives us rain. Cold air can give us snow, sleet, or hail.

Now you can look at the sky and think: Is it wet drops, soft flakes, tiny ice pieces, or hard ice balls?

Meteorological Safety and Emergency Preparedness

Weather can change. Sometimes the weather is calm and sunny. Sometimes the weather can be dangerous. We can learn how to stay safe in big storms, very hot weather, and lightning storms.

Being prepared means we know what to do before, during, and after bad weather. When we know the safety rules, we can help keep our bodies safe.

Introduction

Meteorology is the study of weather. Safety means making good choices to protect ourselves. Emergency preparedness means getting ready for weather that may be unsafe.

Grown-ups, teachers, and helpers make plans to keep children safe. First graders can help by listening carefully, staying calm, and following directions right away.

Main Teaching Points

1. Know the kinds of dangerous weather

Some weather can hurt people if they are not careful. Here are some kinds of dangerous weather:

• Thunderstorms have dark clouds, heavy rain, thunder, and lightning.
• Lightning storms can be dangerous because lightning can strike very fast.
• Very hot weather can make our bodies too hot.
• Strong wind and heavy rain can knock things over and make it hard to see.

2. Warning signs in the sky and around us

Weather often gives us clues. We can watch for warning signs and tell a grown-up.

• Very dark clouds
• Loud thunder
• Bright flashes of lightning
• Strong winds that blow trees and trash
• Air that feels very hot for a long time
• Heavy rain that starts quickly

If you see or hear these signs, tell a grown-up right away.

3. What to do in a thunderstorm or lightning storm

Lightning is very dangerous. If you hear thunder, you should go inside right away. A safe place is a house, school, or building.

When there is lightning:

• Go inside.
• Stay away from open fields.
• Do not stand under a tree.
• Get out of pools, lakes, or puddles.
• Listen to your teacher or another grown-up.

If you are already inside, stay there until a grown-up says it is safe.

4. What to do in very hot weather

Hot weather can make people feel tired, dizzy, or sick. Our bodies need water and rest to stay cool.

In very hot weather:

• Drink water.
• Wear light clothes.
• Rest in the shade or inside.
• Tell a grown-up if you feel sick or too hot.
• Do not stay in a hot place too long.

Babies, children, and older people need extra help in very hot weather. Always check with a grown-up.

5. What to do in strong wind or heavy rain

Strong wind can blow branches and other things. Heavy rain can make the ground wet and slippery.

• Go inside if a grown-up tells you to.
• Stay away from windows.
• Do not play in deep water.
• Walk carefully on wet ground.
• Let grown-ups handle the emergency.

6. Safety tools and plans

Families and schools make safety plans. A safety plan tells us where to go and what to do.

A plan may include:

• A safe room or safe building
• A trusted grown-up to listen to
• A flashlight
• Water
• A way to hear weather news

Children do not need to make the whole plan. But children can learn the plan and practice it.

7. Listen, stay calm, and follow directions

During an emergency, it is important to stay calm. Calm means your body and voice are under control. It is okay to feel scared, but we still listen and move safely.

• Stop what you are doing.
• Listen to the teacher, parent, or helper.
• Walk, do not run, unless a grown-up says to hurry.
• Stay with your group.
• Ask for help if you need it.

Worked Examples

Example 1: Hearing thunder at recess

You are outside at recess. You hear a loud boom of thunder.

What should you do?

1. Stop playing.
2. Listen to the teacher.
3. Go inside right away.

Why? Thunder means lightning may be nearby. Inside is safer than the playground.

Example 2: A very hot afternoon

You are playing outside. Your face feels hot, and you feel very tired.

What should you do?

1. Tell a grown-up.
2. Go to a cool or shady place.
3. Drink water.
4. Rest.

Why? Your body may be getting too hot. Water, shade, and rest help keep you safe.

Example 3: Dark clouds and strong wind

You look outside and see dark clouds. The wind is blowing hard. Leaves and small things are moving fast.

What should you do?

1. Tell a grown-up or teacher.
2. Go inside if told.
3. Stay away from windows.

Why? Dark clouds and strong wind can mean a storm is coming. A building is safer than being outside.

Example 4: Choosing the safer place

There is lightning outside. Which place is safer: under a tree or inside the school?

Answer: Inside the school is safer.

Why? Trees are not safe in lightning. A strong building is the safer place.

Easy Safety Reminders

• If you hear thunder, go inside.
• If you see lightning, stay away from trees and water.
• If it is very hot, drink water and rest.
• If wind and rain get strong, listen to a grown-up.
• Always follow the safety plan.

Brief Summary

Dangerous weather can happen, but we can be ready. We watch for warning signs like dark clouds, thunder, lightning, strong wind, heavy rain, and very hot weather.

To stay safe, we listen to trusted grown-ups, go inside when needed, drink water in hot weather, and stay calm. Knowing the safety rules helps protect us during weather emergencies.