Weather and Climate Revision
by Charlotte Goulut
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Weather and Climate Revision
Big Picture of weather and Climate
Weather is the state of the
atmosphere around us.
(Warm,Wet, Windy). It
can change from hour to
The main causes of weather
are the sun, and water vapor.
Climate is the average weather
in a place- what is usually like
Climate changes from place to place, because
of the factors such as distance from the equator,
and from sea
Two main causes that create weather
the sun heats the Earth. but it does not heat it evenly, because
the earth is round. So the top and the bottom don't warm up much.
The Earth in turn heats the air- so the air also warms unevenly.
Warmer air rises. Colder air then moves in to take it's place, as
The sun also warms the oceans. This causes water to evaporate to give a gas,
Water Vapor- the second main cause of weather. the Water Vapor mixes through
the air, helped by wind.So there is some in the air around you even if you are
miles away from water. The water Vapor also rises up to the sky and creates
clouds. Which then cause rain.
New node, New node
meteorologic or weather scientists use data to
write weather reports, and draw weather maps,
and make weather forecast.
DEF- Weather is the state of atmosphere at a
given time. You can tell a lot about it just by
Equipment for measuring the Weather
Anemometer ( wind turns the
cups which turns a counter).
Visibility Meter ( a beam of light is sent
out and a sensor measures how much
Types of clouds
Cumulus Clouds- They are usually the result of warm air
rising fast. for example when the ground heats up the air
quickly on a hot day, or air rises at the side of a
Stratus Clouds- They are the result
of air rising more slowly, over the
wide area. For example when a
warm air mass slides up slowly over
a cold on, leading to frontal rain.
Cirrus Clouds- They are usually
the sign that warm front is
Types of Rainfall
CONVECTIONAL RAINFALL- The air rises because the
ground heats it up. it rises as currents of warm air. We call
these Convection Currents. So we call the rain Convectional
RELIEF RAINFALL- Wind is moving the air. When
the wind meets a line of high hills or mountains
there's only a way to go up! We call this Relief
FRONTAL RAINFALL- As you can imagine, huge blocks of air call
air masses move around the earth. When a warm air mass meets
a cold one, the warm air is forced to rise.So we get rain. This is
called Frontal Rainfall.
Although we can't feel it all the air above is pressing down on us,
giving air pressure. If air pressure if LOW,it means that the air is
rising. If it is high it means that the air is sinking. And each
brings a different weather
An air mass coming from the North Pole will be
cold and dry, so if it moves over the UK you'll
get cold dry weather. An air mass coming from
warm ocean will be warm and dam, and if it
moves over the UK you will get warm dampish
weather.Often, two different air masses will
meet and clash and this causes sudden
changes in the weather.
A Warm Front means a warm
air mass is arriving.
Four other factors that affect
the climate of a place
Distance from the coast. the sea is cooler than the
land in summer, and warmer in winter. So the sea
breeze keeps the coast cool in summer- and warm in
Prevailing wind direction. For example in the UK
the prevailing wind is from the south west. It
brings water vapor from the ocean- and that
Ocean currents. For example a warm ocean
current called north Atlantic Drift warms the west
coast of the UK winter, the the warming wind.
Height above sea level. Or Altitude. The higher
you are above the sea level, the cooler it is. The
temperature falls by about 1 Degres Celsius for
every 100 meters.
The earth travels non stop around the sun. It is tilted as it
travels. And that's why the climate in different places can be
so different, in different months. The tilt gives our planet