Name _______________________________________
Everybody talks about…the weather. You may have heard the expression, “Everyone talks about the
weather, but no one ever does anything about it.” Well, we do talk about weather all the time, because
this powerful force of nature affects everything we do. As sophisticated as the modern world is, we are
still pretty much at the mercy of the weather. We cancel picnics when it rains and sometimes get a day
off from school when it snows. Warm, sunny days and rain help crops grow, but too much of either
kills them. A storm like a tornado can cause millions of dollars in damage and take many lives.
Rain, snow, hot sunny days,
wind…what creates these
and all the other events we
call weather? Heat from the
Sun.
The Sun heats up the
land and water on the Earth’s
surface; this heat rises up and
warms the atmosphere. All
this air movement gives us
weather in all its great variety,
from the wildest storms of winter
to the most pleasant, sunny
days of summer.
Weather happens in the
atmosphere, a layer of air
wrapped around our planet.
Almost all our weather happens
in the lowest part of the
atmosphere called the
troposphere. It’s like a gigantic
mixer, churning up all the
ingredients – air pressure,
temperature, wind, and humidity –
to make different types of weather.
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Temperature
The land and water on Earth’s surface absorb heat energy from the sun. Some of this
heat energy then warms the atmosphere above the surface. The amount of heat
that is absorbed by the Earth’s surface and then released into the atmosphere
changes from hour to hour and day to day.
The sun is lowest in the sky early in the morning. When the sun is low in the sky, sunlight
strikes Earth’s surface at a low angle. The sunlight is spread out so the ground warms
up less. At noontime, when the sun is highest in the sky, sunlight strikes Earth’s surface
like a more focused beam. The light is more concentrated. Earth’s surface heats up
more. A few hours later, much of this heat has warmed the atmosphere. That’s why
temperatures are usually highest in mid-afternoon.
Different surfaces heat up at different rates. Grass heats up very slowly and does not
hold heat well. That’s why grass feels cool to your bare feet on a hot day. Water
heats up slowly, but holds heat longer than grass. Roads, especially black tar roads,
heat up quickly and can get very hot on a sunny day. They cool down quickly during
the night.
Wind
Wind is moving air. Air moves because Earth’s surface is heated unevenly. On a hot
summer day at the beach, the land heats up faster than the water. The air above the
land becomes warmer than the air above the water. The warmer air above the land
rises. It is replaced by cooler air moving in from above the water. This wind is called a
sea breeze.
After sunset, the land cools faster than the water. Now the air above the water is
warmer than the air above the land. The warm air above the water rises. It is
replaced by cooler air moving in from above the land. This wind is called a land
breeze.
Wind speed is
measured with
an anemometer.
The wind pushes
against the cups
and makes them
spin around. The
faster the wind is
blowing, the
faster the cups
spin.
Weather
(Eyewitness video)
1. The _________________________ changes when
sunshine, air, and water interact on the ground and in
A wind vane shows wind
direction. The arrow
points to the direction
the wind is coming from.
In this picture, the wind
is blowing from the west,
so the arrow points west.
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the sky to produce clouds and wind.
2. Scientists who study the weather are called _______________________________________
3. The blanket of air that surrounds Earth: _________________________________________
4. Moving air that blows from high to low-pressure areas: _______________________________
5. Air has weight, it pushes on things in all directions, and this is called ______________________
6. Air always moves from ________________ pressure to ________________ pressure areas.
7. Energy from the Sun causes liquid water to turn into a gas called __________________________
8. The change of liquid water into an invisible gas called water vapor: _______________________
9. The water vapor rises into the atmosphere and cools as it rises, joining with dust or smoke particles along the
way. As it cools, the invisible water vapor collects into tiny water droplets that form
_____________________________________________
10. The droplets in clouds keep combining, causing the clouds to _________________________
11. Eventually, the droplets get so large; they can no longer remain up in the air,
_____________________________ pulls them down toward the Earth’s surface.
12. When moisture returns to the Earth’s surface it is called ________________________________
13. Precipitation can be in the form of: ________________________________________________
14. A tool that measures in what direction the wind is moving. _____________________________
15. A tool that measures how fast the wind is moving. ____________________________________
16. The _____________________________ is a strong, fast-moving river of wind high in the atmosphere that
blows from west to east around the world.
17. The never ending process that recycles Earth’s water supply by using energy from the sun.
______________________________________________________
18. A cloud on the ground. ________________________________
19. Thunderheads…these clouds grow very large and dark and they bring storms, heavy wind and lightning:
_______________________________________________
How’s the weather?
http://www.brainpop.com/search/search.weml?keyword=weather “Weather”
The answer to this question depends on what kind of air mass is passing over your
region. Air masses are large bodies of air. The main characteristics of an air mass are
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its temperature and humidity. Humidity is a measure of the moisture in the air. An air
mass can be cold and dry, warm and dry, cold and moist, or warm and moist. Air
masses tend to travel around the globe in big chunks that cover thousands of square
miles. Air masses get their particular characteristics from the Earth surface over which
they form. Warm, wet areas like the Gulf of Mexico produce warm, humid air masses.
Cold, dry areas like northern Canada produce cold, dry air masses. Air masses take
on the temperature and humidity of the area over which they form.
Air has mass. Because it has mass, it has weight. Air pressure is the
weight of air pressing on everything around it. Air presses on objects
from all sides, not just down on them. Air pressure is measured with
barometer. When the air pressure changes, you can tell that the
weather will change. Rising air pressure means clearer weather is
coming. Falling air pressure means unsettled or wet weather is coming.
The air in a high-pressure center is under high pressure, like air in a bicycle tire. Highpressure centers usually bring stable, fair weather, which may be bitter cold and
sunny or warm and sunny depending on the season. Clouds and precipitation are
usually found in areas where air pressure is low, low-pressure centers. But it doesn’t
last forever because air masses are always on the move, bumping into each other as
they travel around the globe.
Movement in Air Masses Change Our Weather
When one air mass collides with another, the line that separates them is called a front. Weather
changes at fronts. A warm front means a warm air mass has caught up with a cold air mass. A warm
front brings steady light precipitation followed by a rise in temperature. A cold front means a cold air
mass has caught up with a warm air mass. A cold front brings a sudden change in the weather: heavy
precipitation – thunderstorms or snowstorms – and a drop in the temperature.
It’s pretty easy to understand why Hawaii is warm (because it’s near the equator, of course!). But
knowing what you do about air masses and fronts, why do you think the Northeast is rather stormy?
The Pacific Northwest rainy? The Southwest so dry? The Northeast is stormy because cold air from
Canada often collides with warm ocean air from the tropics; the Pacific Northwest is often covered by
moist air masses from the Pacific Ocean; the Southwest gets dry air masses from Mexico.
4
The Jet stream, a band of air high above the Earth, moves
air masses from one area to another. This steady worldwide wind
blows from west to east 7 to 8 miles above the Earth’s surface. Its
speed is usually about 40 miles per hour in the summer and about
80 miles per hour in the winter.
The jet stream separates cooler air to the north from
warmer air to the south. It usually shifts southward in winter
bringing freezing weather as far south as Florida and moves
northward in the summer bringing warmer weather up north.
When the jet stream dips south over the U.S., it pulls cold air down
from Canada. When the jet stream moves north, it pulls warm air
up from the Gulf of Mexico.
http://www.brainpop.com/search/search.weml?keyword=weather “Wind”
Precipitation
http://www.brainpop.com/search/search.weml?keyword=water+cycle
The atmosphere contains water vapor. When air gets cooler, water vapor condenses.
That means it changes to tiny droplets of liquid water. Water droplets clump together
to form a cloud.
As more water vapor condenses, the droplets grow larger. When the drops get too
large and heavy, gravity pulls them to the Earth’s surface. Water that falls to Earth’s
surface is called precipitation. There are different types of precipitation.
Bill Nye Video
5

1. To forecast a storm, you must know which way the _________________ is blowing.
2. Sunny, calm weather usually comes with high _______________________.
3. When a _______________ shows falling pressure, stormy weather might be coming.
4. The liquid in this weather tool expands consistently when it is heated and contracts consistently
when it cools. This tool is used to measure temperature and it is called a
__________________________
5. Fahrenheit Scale: Freezing = ______
Water will boil at ___________
6. Celsius Scale: Water will freeze at ________ Water will boil at __________
7. A person who studies the weather is called a _________________
8. Some houses have a wind ______________ on the roof to give the wind direction.
9. This layer of the atmosphere, the ____________________, is about 8 miles thick; this is where the
weather happens.
10. What parts of the Earth are always cold? __________________________________
11. What kind of weather do you find around high-pressure? __________________________
12. Warm air masses are always forming at this location on Earth: ____________________________
13. What makes weather move around the world? _______________________________
14. Why do seasons occur? Earth’s ________________________________________________
15. What does an anemometer measure? __________________________________
16. Falling air pressure indicates that _________________________________ weather is coming.
17. Rotation or spinning of the Earth gives us ___________________________________.
18. Winds are named for where they are coming _____________________________.
19. When the sun is high in the sky the rays are ( spread out OR concentrated ) .
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Some plants, like sunflowers, follow the sun. This response is called heliotropism.
In the United States, most thunderstorms happen around Tampa Bay, Florida, where the air
and water are always warm.
The most tornadoes on Earth happen in the United States in an area from Oklahoma into northern
Texas, called Tornado Alley.
Answer either True or False.
If the question if false, fix the statement to make it true.
20. _______ The wind controls which way weather moves.
21. _______ A thermometer tells you air pressure.
22. _______ Air pressure is measured with a barometer.
23. _______ Low pressure usually means dry, sunny weather.
24. _______ Days and nights are caused by Earth’s rotation (spin).
25. _______ When air is moving, we call it wind.
26. _______ Warm air sinks to the ground.
27. _______ The Earth gets its heat from the land and water heated by the Sun.
28. _______ A barometer tells you the wind direction.
29. _______ The jet stream moves weather around the Earth.
30. _______ Cold air is heavier than warm air and it sinks to the ground.
31. _______ Thermometers tell you how warm the air is.
32. _______ We could live without air.
33. _______ Somewhere on Earth, air is always moving.

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1. Weather occurs in this part of Earth’s atmosphere: _________________________________
2. A tool used to measure the wind’s speed is called an: ________________________________
3. A tool used to measure the wind’s direction: ______________________________________
4. Water vapor in the air is called ________________________________________
5. The “push” of air against objects in every direction is called _________________________________
6. Land heats up quickly during the day and cools down quickly at night. True or False
7. Water heats up slowly and cools down slowly. True or False
8. Changes in the weather are caused by _________.
a. the North and South Poles
b. movement of air masses
c. changes in temperature
9. Movement of air is called ____________________________________
10. Cold fronts cause a sudden change in the weather.
True or False
11. Warm fronts are followed by a rise in temperature.
True or False
12. When a front passes through a region, the weather ___________.
a. stays the same
b. changes
13. Air masses form over the equator and the North and South Poles because _______.
A. cold air is heavier than warm air
B. warm air moves toward the poles
C. the temperature in these areas is either constantly cold or hot
14. The atmosphere is made mostly of these two gases: ______________________ & ___________________
Atmosphere Video
air pressure
ozone layer
precipitation
troposphere
evaporation
day and night
jet stream
ultraviolet rays
Bill Nye
condensation
barometer
shooting star
atmosphere
photosynthesis
seasons
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1. The layers of gases that surround a planetary object: ________________________________
2. Earth’s atmosphere is mostly made of: ______________________ & ______________________
3. The force that air exerts on the Earth’s surface and anything on it: __________________________
4. An instrument that measures air pressure: ____________________________________
5. The lowest part of the atmosphere begins at the Earth’s surface, weather occurs here:
__________________________________
6. A band of high speed, high altitude winds usually found in the Earth’s lower stratosphere; these
winds push Earth’s weather around the globe: ______________________________________
7. Invisible energy waves from the Sun that are potentially harmful: _________________________
8. A protective layer of gases in the Earth’s atmosphere that absorbs many of the Sun’s harmful
ultraviolet rays: ______________________________________________
9. An intense flash of moving light that is caused by small bits of rock and debris crashing into the
atmosphere and burning up in the mesosphere; also called a meteor: _______________________
10. The process by which green plants create breathable oxygen and sugars from sunlight, carbon
dioxide, water, and chlorophyll: _______________________________________________
11. The conversion or changing of liquid water-to-water vapor: _____________________________
12. The conversion of water vapor, water in its gaseous state, to liquid water: ___________________
13. Moisture, water that falls from the clouds as rain, sleet, snow, or hail: ______________________
14. Earth’s tilt and revolution give us __________________________________________
15. Earth’s rotation or spin gives us _______________________________________________
http://www.brainpop.com/search/search.weml?keyword=weather “Clouds”
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When it’s so cold
outside you can see
your breath, what you
are seeing is actually a
little cloud. When steam
rises from a kettle of
boiling water, it’s a
cloud you’re seeing.
When the fog rolls in,
you guessed it…it’s
really a cloud.
The air around us is
filled with moisture that
it soaks up from
oceans, lakes, and
rivers. As air rises from
the warmth of the
ground and meets
cooler air above, its
temperature falls. This
causes the moisture to
form microscopic
droplets of water (the
process is called
condensation). Clouds
are made up of millions
of these tiny droplets.
Form in the sky opposite the Sun when sunlight shines on falling rain.
(Raindrops act as prisms for sunlight, bending rays and separating them into their spectral colors.)
The higher the Sun is in the sky, the lower a rainbow will appear.
A Rainy Day, A Snowy Day
Have you ever gone to bed at night thinking it’s going to snow? Maybe you’ll get a day off
from school. You can spend the day sledding and making snow forts. Then you wake up and,
oh no, it’s raining! What happened? It just wasn’t cold enough inside the clouds for snow to
form. Whether it’s snowing or raining, the moisture you see falling to Earth began as zillions of
tiny water droplets in the clouds.
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Why do raindrops keep falling on your head? The answer is gravity. Can you imagine
something as tiny as 1 of an inch in diameter? That’s the size of a water droplet in a
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cloud. It’s so small and light it stays afloat. But inside a cloud, droplets keep bumping into
other droplets and forming bigger droplets. Once a droplet is 1 of an inch in diameter,
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gravity pulls it to Earth…as rain or, if it’s cold enough to freeze, as snow.
The next time you’re disappointed because a ball game or another fun activity is rained out,
remember that all living things, including us, need rain to survive. Crops like corn and wheat
need at least 20 inches of rain or more during a growing season. That’s a lot of water. One
inch of rain falling over an acre of ground equals 27,143 gallons of water. In general, that
moisture in a foot of snow is equal to the moisture in an inch of rain.
Have you ever wondered why hailstorms usually occur in summer? True, hail is moisture that
freezes in the clouds, just like snow. But unlike snow, hail forms inside clouds that cause
thunderstorms, which occur mostly in warm weather. As the hailstones fall toward Earth,
strong winds keep pushing them back up into the colder air, freezing them again with each
up-and-down trip. Sometimes these little ice balls can get really big. The biggest one on
record is a 1.7 pounder that fell on Coffeyville, Kansas, in 1970.
You’ve probably heard the expression “pure as the driven snow.” Actually, snow isn’t all that
pure. Snowflakes form when moisture in clouds clings to tiny bits of dust, clay, sand, and other
debris from the Earth and freezes. A snowflake is one of nature’s most beautiful creations. Of
the zillions of snowflakes that fall to Earth, each one has six sides, but no two are ever alike.
Keeping an Eye on the Weather
Of course, forecasters don’t just look out the window to prepare the weather report
you see on T.V. They use a sophisticated weather information network located all
over…and above…the globe. Satellites orbit the Earth constantly. Planes and balloons
make daily ascents to gather data. Weather stations in almost every country on Earth
contribute data.
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As you’ve noticed, forecasters still make mistakes. That’s because a forecast is only a
prediction of what’s likely to happen, based on what’s happening now. But nature doesn’t
always follow a predictable pattern. So a forecast is only an educated guess, not a
guarantee.
Nature gives us a lot of clues about weather conditions.
They’re not always foolproof, but people were using these natural weather forecasts
long before the Weather Channel went on the air! How many of these do you think really
work?
If a groundhog sees its shadow on Groundhog Day (February 2), the weather will remain cold
for six more weeks. (No, this is groundhog-wash!)
Pine Cones close up when rain is on the way. (True…check it out sometime.)
A ring around the moon means rain or snow is coming. (Sometimes, since the ring can be caused
by thickening moisture in the atmosphere)
Flowers of the morning glory and scarlet pimpernel open when it’s sunny, close when rain is due.
(True…sort of. Sometimes they don’t close up until the rain has started to fall.)
“Red sky at night, sailor’s delight. Red sky in the morning, sailors take warning.”
(Never been proven to be true.)
Cows lie down when bad weather is coming. (Not very reliable, since cows also lie down when
they’re hot or get tired of standing.)
Bill Nye video
1. Water enters the air by _________________________________________
2. Moisture in the atmosphere occurs in three states: ___________, ____________, ____________
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3. Evaporation is caused mostly by _________________ from the __________________________
4. Most of the moisture evaporates from … _____________________________________
5. When water evaporates it turns into a gas called ___________________________
6. Water vapor in the air is called ________________________
7. Which can hold more water vapor, warm air or cold air? ___________________________
8. As water vapor raises up into the atmosphere it (warms up or cools down) ___________________
9. The water vapor molecules cool in the atmosphere and squeeze together to form droplets of ice or
water, this
is called _______________________________
10. The gaseous state of water is called ______________________________________
11. _____________________ form in the atmosphere when water vapor condenses to form droplets.
12. When the droplets in the clouds get too heavy, they fall back to the Earth’s surface. This is known as
__________________________
13. The four forms of precipitation are: __________, ___________, _____________, _____________
14. The water cycle includes three steps: ________________, _______________, _________________
When you fly in airplanes, your ears pop because of the low pressure in the sky.
Heat from the Sun travels more than 90 million miles through space before reaching Earth.
Many insects, like crickets, become more active when the air is warmer.
Polar
Very cold winters.
Summers are slightly
warmer, but short.
Lots of snow, but
little rain.
Temperate
Moderate rainfall,
with snow in winter.
Warm summers and
cold winters.
Tropical
Very high rainfall.
Very hot and humid
most of the year.
Arid
Very low rainfall. Big
changes in temperature
between day and night
and between summer and
winter.
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How’s the Climate?
http://www.brainpop.com/search/search.weml?keyword=weather “Climate”
If you are suffering through a hot, humid summer day, blame the weather. But if …year after
year…most summer days where you live are hot and humid, blame the climate.
Climate refers to the average weather conditions in a region over a long period of time. For
example, near the equator, some hot, steamy tropical rain forests are drenched by about 160
inches of rain per year – every year. (That’s more than 13 feet!) in Las Vegas, Nevada, on the
other hand, the average rainfall per year is around four inches. In Antarctica, temperatures are
low throughout the year, year after year. They average -70F! However, in Montreal, Canada,
the average temperature in January is 13F, while in July it’s 69F!
Climate varies widely all over the world. Because of this, scientists divide the Earth into
different climate zones. Conditions aren’t exactly the same all over a specific climate zone, but
places in a zone share certain characteristics, like extremely low temperatures or very high
rainfall.
Climate affects many aspects of your life, from the clothes you buy to the outdoor sports you
play to which plants and animals live near you.
Q: Which animal can survive in any climate?
A: You… and all the other humans on Earth. Our bodies react in certain ways (like shivering) to
withstand the cold and in other ways (like sweating) to withstand the heat. But our main survival
advantage comes from our brains. We use our brains to invent things that help us remain
comfortable when it gets too hot or cold and too wet or dry – like air conditioners and fleece
jackets.
Hot? Cold? We’re Flexible! Human bodies can become acclimatized, or used
to, levels of extreme cold and heat. If you visit someplace that’s hotter or more humid
than you’re used to, you’ll feel uncomfortable at first. But after a week or so, your body
will adjust. You’ll start to sweat more, and your temperature won’t rise as much when you
exercise. Our bodies’ ability to adapt is one of the main reasons human beings can live in
so many different climates.
Will it rain? That’s the question on most people’s minds when they check the weather report
(unless it’s really cold out, and they are looking for snow). Watching weather forecasts on TV,
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you see lots of Hs and Ls and bumpy lines on the weather maps. You also hear plenty of strange
phrases like “dew Point” and “barometric pressure.”
To understand weather terms, it’s important to know that its atmosphere - an envelope of air
about a thousand miles deep, surrounds Earth. The atmosphere contains invisible gases such as
nitrogen and oxygen. It also holds the water vapor that makes rain and snow.
About 99% of all weather takes place within the lowest 11 miles of the atmosphere, called the
troposphere. The Sun’s heat keeps gases there churning all the time. That makes a weather
forecaster’s job pretty tricky.
Fronts
A front is the boundary between two masses of air that have different temperatures and levels of
humidity (moisture content). Fronts cause storms. Cold air is heavier than warm air. So when a cold
front moves in, the cold air wedges underneath the warm air, forcing it to rise. This causes clouds to
form and produces rain or snow. A warm front coming in rides up over the cold air. Again clouds form
and rains come.
http://www.brainpop.com/search/search.weml?keyword=weather “Thunderstorms”
Humongous Hurricanes
Dark clouds fill the sky. It’s the middle of the day, but it looks like night. The wind howls.
Rain pelts the ground so hard that holes form in the mud. Tree branches bend and crack.
Whole trees are uprooted and crash down. Store windows break. The roofs of buildings sail
through the air. Electric wires send out sparks and dangle dangerously from broken utility
poles. Signs fly across highways. Water floods the streets. It is no time to be outdoors, that’s
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for sure. You are in the middle of a hurricane – the largest, fiercest storm of nature. How do
these storms start, and how can we protect ourselves from them?
Hurricanes begin as clusters of thunderstorms that spiral and grow into one giant storm.
Hurricanes feed on warm moist air rising from the ocean near the equator. Warm water
evaporates (turns into water vapor) from the surface of the ocean and rises. As it rises, it
cools. This causes the water vapor to condense (to squeeze together) forming thunderclouds
called cumulonimbus clouds. Strong winds in the atmosphere cause these clouds to swirl. A
cumulonimbus is a very large thunderstorm cloud that extends to a great height, over 50,000
feet! Once these clouds form, the first stage of hurricane development has begun. It gets
bigger and bigger as winds from the continent of Africa blow the storm westward, picking up
more warm moisture. When the wind reaches 74 mph, the storm is called a hurricane. Why
don’t hurricanes ever form in Kansas, Oregon, or Vermont? Why do they always start in the
tropics? It’s because an area of the tropics that lies between five degrees north and five
degrees south latitude of the equator has ocean waters of at least 80F over a large area.
This warm moist air is “food” for the Hurricane.
The storms that form in the Atlantic Ocean are called hurricanes, while those that form in the
northwestern Pacific Ocean are called typhoons. Storms that form over the Indian Ocean are
called cyclones. Australians call these storms willy-willies. Meteorologists call all of these
storms tropical cyclones. Tropical means the storms are formed in areas of oceans near the
equator. No matter what the storms are called, on average, about 80 of them occur
worldwide each year.
Tornado Terrors
A tornado, or twister, is a spinning column of air that sucks up everything in its path. During
thunderstorms, hot air rises and meets cold air. If the air currents whirl around each other, then a
deadly twister is born! Tornadoes are by far the most destructive storms on Earth. Winds in the
whirling black column called a funnel cloud can exceed 300mph. The funnel cloud is like a giant
vacuum cleaner, picking up cars, houses, and everything else in its path.
After a tornado has passed, people notice some strange things. Sometimes, for instance, pieces of
wheat are rammed through trees like arrows, or a school of fish ends up in someone’s front yard.
About 75% of all tornadoes occur in the United States; that’s tornado alley. Anyone living in the areas
between Texas and Illinois can expect an average of 750 twisters a year!
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That’s Weird!
A tornado on a sea or lake is called a
waterspout. It’s a twisting column of spray
and water vapor that sways over the waves
like a snake. Sailors in ancient times
thought that waterspouts were sea
monsters who had come to devour their
ships.
NEVER STAND UNDER a tree or in an
open field during a lightning storm.
Where does lightning come from? Lightning is made inside a huge, dark storm cloud, called a cumulonimbus.
Inside a storm cloud, water droplets and ice crystals rub together. This rubbing makes electricity, which builds
up and builds up. Suddenly, it surges out of the cloud in the huge spark that we call lightning.
And thunder? Thunder is made by lightning. A lightning bolt is amazingly hot – four times hotter than the
surface of the Sun. air around the bolt heats up so quickly that it expands with a mighty rumble. This creates a
massive roll of thunder.
Why the flash before the boom? Thunder and lightning set off together. But light travels so fast that lightning
speeds off. It takes five seconds for sound to travel a mile. Lightning always arrives first. This is why you see
the flash of lightning before you hear the boom of thunder. When you see the lightning flash, start counting the
seconds until you hear the thunderclap. Divide the number of seconds by five to find out how many miles away
the storm is.
http://www.brainpop.com/search/search.weml?keyword=weather “Tornadoes”
1. Tornadoes only happen in the daytime. __________
2. Most tornadoes hurt people. _______
3. Tornadoes last for many hours. _______
4. The United States has the most tornadoes. ________
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5. Tornadoes come from severe thunderstorms. _______
6. Some people call tornadoes “twisters.” ________
7. It’s OK to stay outside during a tornado. ________
8. Tornadoes are bigger than hurricanes. ________
9. The F-Scale measures how slow a tornado is going. ______
10. Mobile homes are safe from tornadoes. _________
About 1,000 tornadoes happen every year in the United States.
Mobile homes don’t attract tornadoes, but they are more damaged by tornadoes than regular
homes.
While most tornadoes don’t hurt people, in 1925, a tornado killed nearly 700 people. It lasted
more than three hours as it moved over 200 miles across three states.
Big tornadoes are not always stronger than smaller tornadoes.
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