1. Weather National 5 supported study

2. What are the factors that affect the weather?
Starter
What are the factors that affect the weather?

3. Factors affecting the weather
Altitude
Latitude
Distance from the sea
Ocean currents
Aspect
Rainshadow effect
World trade winds (the jet stream)

4. Air masses

5. Air masses Source area Characteristics Land Dry Oceans Wet Tropics
Warm
Arctic
Cold

6. Air masses Name Source area Weather characteristics
Tropical Maritime (mT)
Atlantic Ocean
Warm and wet
Tropical Continental (cT)
Southern Europe and North Africa
Warm and dry
Polar Maritime (mP)
North Atlantic
Cold and wet
Polar Continental (cP)
Northern Europe
Cold and dry
Arctic Maritime (mA)
Arctic Ocean
Very cold. Not always wet due to low humidity.

7. Air pressure

8. Air pressure
n/revision/3

9. Weather symbols

10. Weather symbols
Describe the weather at Lerwick and Land’s End.

12. What do you know about this type of air pressure?

13. Past paper questions

14. Describe the changes in weather that the people of London are likely to see in the next 24hrs.
5KU

15. London will experience changing weather as it is in the middle of a low pressure system.
As London is currently in a warm sector it will be relatively warm and dry (1), it has no fronts above it so there will be a clear sky and no rain (1). As the cold front moves in the temperature will drop (1) and winds will increase (1). The cold front will bring heavy rainfall (1) and possibly thunderstorms. As the cold front passes London will continue to have low temperatures but the rainfall will be less heavy and there will just be some showers (1 or 2). After the fronts have passed there is a band of higher pressure and the sky will be clear with little to no wind.
Model answer