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Last week, we looked at rain, wind and clouds. This week we are going to look at weather in different parts of the UK. But first we need to think about what makes one place different from another.

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last week we looked at rain wind and clouds

Last week, we looked at rain, wind and clouds

This week we are going to look at weather in different parts of the UK

slide4
Also air from the sea has more water vapour in it, so it tends to be wetter than inland – remember relief rainfall from last week
what is it like to live by the sea
What is it like to live by the sea?
  • Is it likely to be wetter or drier? Why?
  • Will winters be warmer or cooler? Why?
the next bit is quite hard
The next bit is quite hard …
  • So if you do not understand it, don’t worry about it.
  • The only thing you need to get out of it is that there is a temperature difference between places near the equator and places near the North and South Pole.
  • The next couple of slides explain why that is – but as I said – if you find it too confusing, don’t worry about it.
  • But I thought I had better explain, otherwise some picky soul would be sure to ask why if I didn’t!
slide9

Earth’s Seasons

Tilt of the Earth’s axis towards or away from the sun creates

the seasons

When the north pole tilts toward thesun, it gets more radiation – more warmth

during the summer

SUMMER (Northern Hemisphere)

North Pole

Equator

Earth

South Pole

When the north pole tilts toward thesun, the south pole tilts away

So when it’s summer in the north,

it’s winter in the south

WINTER (Southern Hemisphere)

slide10

Earth’s Seasons

When the north pole tilts away

from the sun, it gets less radiation

So it’s colder during the winter

WINTER (Northern Hemisphere)

North Pole

Equator

Earth

South Pole

When the north pole tilts away from thesun, the south pole tilts toward it…

When it’s winter in the north,

it’s summer in the south

SUMMER (Southern Hemisphere)

britain s climate
Britain’s Climate

Britain’s Climate is:

  • Variable - it changes from day to day
  • Temperate – there are never extremes

e.g it is never too anything

[hot, dry, wet, cold]

  • Maritime- proximity to ocean affects our weather

Britain is renowned for cool summers

and mild winters.

temperatures in britain
Temperatures in Britain

Average JULYTemperatures across the UK

  • Those little lines are called isotherms
  • Iso means equal
  • Therm refers to temperature
  • So isotherms are lines of equal temperature
  • What do you notice about the average July? Why is that?
average january temperatures across the uk
Average JANUARY Temperatures across the UK
  • What do you notice about the isotherms in January?
  • Why do you think that might be?
  • What do you know about the sea cooling and warming up?
slide14
In fact it could be said that we have 4 climates!
  • Imagine a line from north to south through the centre of the country, this is the 5-degree Celsius January isotherm; and another from west to east, again through the centre, is the 15-degree Celsius July isotherm.
  • We’ve now spilt the country into 4 quarters, each having its own characteristic temperature, rainfall and patterns of seasonal change.
where does it rain
The 2 dark blue colours is where there is more than 1300mm of rain a year.

How many cm tall are you? Where would that amount of rain come up to?

What do you notice about where the dark blue bits are?

Any ideas why?

Where does it rain?
why is it wetter in parts of the uk
Why is it wetter in parts of the UK?
  • It is wetter in the west because our prevailing wind is SW ( along with the gulf stream)
  • SW winds come across the Atlantic, picking up lots of water vapour as they travel.
  • But why do the clouds seem to drop most of it when they hit the land? Do you remember what that kind of rainfall is called?
so in summary
So in summary
  • Comparing us with say Belgium or Northern Germany
  • Great Britain is cooler in the Summer, warmer in the Winter, and much wetter in the West.
slide19
Cold winters (<50C) and cool summers and drier

Cold winters and warm summers and drier

Mild winters (>50C) and cool summers (<150C) & wetter

Mild winters and warm summers (>150C) and wetter

If >800 mm it is wet

The red line is the 150Caverage July temp

Blue line is 50C Jan line, E is colder

where do you think this is
Where do you think this is?

What are the red lines for?

January temperature?

July Temperature?

Rainfall?

where do you think this is1
Where do you think this is?

January temperature?

July Temperature?

Rainfall?

where do you think this is2
Where do you think this is?

January temperature?

July Temperature?

Rainfall?

where do you think this is3
Where do you think this is?

January temperature?

July Temperature?

Rainfall?

slide25

Take the south west corner first, Devon, Cornwall and the Scilly Isles. Lets spend the winter there….

slide26

...surrounded by sea and bathed in the

  • warm waters of the North Atlantic Drift,
  • an extension of the Gulf Stream,
  • temperatures very rarely fall below freezing. In fact the Isles of Scilly
  • have a mean January temperature of 8 degrees Celsius and sub- tropical plants flourish!
slide27

Kent and the south east coast of England will be best in summer. Characteristically this quarter experiences both the highest temperatures and the lowest rainfall during the summer months. The area is often overlain by anticyclones or hot, dry air may be drawn in from the Continent, so close to the east.

slide28

The Lakes or the Highlands and Islands of Scotland are kept mild by the same warm ocean current affecting the south west...