Weather in the UK
Transcript of Weather in the UK
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Weather in the UK
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The British Climate
The British Isles has a temperate climate.
This means that it is not too hot, not too cold, not too dry
and not too wet!
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L e a
r n i n g o
b j e c t i v e
s Why is the South of Britain warmer than the
North?
Why are temperatures in January warmer on
the West coast?
Why is there more rainfall in the West?
What is high and low pressure?
Why is the weather in the UK so changeable?
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July temperatures
Isotherms are lines
joining areas ofequal temperature.
‘Iso’ means ‘the
same’.
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1) What is the temperature at A?
16ºC, 15ºC, between 15ºC and 16ºC
3) Which area is the hottest?
Look at your atlas and name this area.
2) What is the temperature at B?
4) Which of the following statements is
true?
a) The North is warmer than the South.
b) The East is warmer than the West.c) The South is warmer than the North.
A
B
July temperatures
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Why is the South of Britain warmer than the North?
Therefore, the sun’s rays are more concentrated in
the South rather than the North of Britain.
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L e a
r n i n g o
b j e c t i v e
s Why is the South of Britain warmer than the
North?
Why are temperatures in January warmer on
the West coast?
Why is there more rainfall in the West?
What is high and low pressure?
Why is the weather in the UK so changeable?
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between 4ºC and 5ºC
Match the letter with the
correct temperature.
January temperatures
A
B
C
4ºC
between 5ºC and 6ºC
Why is B colder than C, even though B is further south?
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Why is it warmer in the West in January?
The North Atlantic Drift is a warm ocean current that
brings higher temperatures to the west of the UK. The
North Atlantic Drift starts its journey in the Gulf of Mexico.
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L e a
r n i n g o
b j e c t i v e
s Why is the South of Britain warmer than the
North?
Why are temperatures in January warmer on
the West coast?
Why is there more rainfall in the West?
What is high and low pressure?
Why is the weather in the UK so changeable?
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Describe the pattern of rainfall in the UK.
Why is there more rainfall in the West of the British Isles?
Rainfall in the British Isles
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Why is there more rainfall in the West?
Many of the mountain ranges in the British Isles occur in
the West.
The West is therefore more likely to experience relief rainfall.
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Why is there more rainfall in the West?
The prevailing wind comes from the SW.
This wind blows over the Atlantic, bringing moisture-ladenair.
The prevailing wind is the most common direction of wind.
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This is a wet day in February.
Explain the following… 1) why C is warmer than B. 2) why it is raining at D.
3) why A is colder than B.
Can you explain?
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L e a
r n i n g o
b j e c t i v e
s Why is the South of Britain warmer than the
North?
Why are temperatures in January warmer on the
West coast?
Why is there more rainfall in the West?
What is high and low pressure?
Why is the weather in the UK so changeable?
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Getting practical
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When air rises, it creates a low pressure system.
Air rising means clouds form and there is a possibility of rain.
Low pressure systems
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When air sinks and warms this causes a high pressure
system. There are clear skies and no rain.
In Summer, clear skies mean that there are no clouds to
stop the sun shining through and so days can be warm.
High pressure systems
Cloud free Europe
At night, however, there are no clouds to stop the heat
escaping so nights can be cool.
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In Winter, high pressure systems give rise to clear,
bright days. However, clear skies also mean that
there are no clouds to stop the heat escaping and
so ice and frost can form.
High pressure systems
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L e a
r n i n g o
b j e c t i v e
s Why is the South of Britain warmer than the
North?
Why are temperatures in January warmer on the
West coast?
Why is there more rainfall in the West?
What is high and low pressure?
Why is the weather in the UK so changeable?
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Why does the British Isles have unpredictable weather?
In the British Isles it can be sunny one minute and raining
the next!
Why is this?
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Why does the British Isles have unpredictable weather?
The answer has a lot to do with air masses…
Air masses are huge blocks of air. They can be damp or
dry, warm or cold, depending on where they came from
and over what type of surface they have travelled.
For example, an air mass that has travelled over the seawill increase its moisture content and be more likely to
produce rainy weather.
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Air masses affecting the British Isles
Many air masses cross the British Isles, which explains
our changeable weather!
Wh t h t th th h th i
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What happens to the weather when the air
masses meet?
Depressions (low pressure system) form when a cold air
mass meets a warm air mass.
The junction between these two different air masses is
called a front. A front is associated with a change in the
weather.
Wh h f ?
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What happens at fronts?
A cold front means that cold air is coming.
At a cold front, cold air pushes under the warm air.
This produces strong winds and heavy rain.
A warm front means that warm air is coming.
At a warm front, warm air is rising over cold air.This usually produces clouds and rain.
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Passage of a depression
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D i
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Depressions
D i th h i th !
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Depressions – the changing weather!
W th d fi iti
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Weather definitions