Objectives
1. Students should know what anticyclones
are
2. Students should recognise the link
between anticyclones and lapse rates
and upper air flow in the Westerlies.
3. Students should know what weather
conditions result from anticyclones.
Describe in full the weather
characteristics of the past 5
days
Anticyclones
1. Compare figure 9.47 the satellite image with
the synoptic chart beneath
2. What are the main characteristics of an
anticyclone? Include information on pressure
gradients, winds and lapse rates.
3. Explain the formation of an anticyclone in a
flow chart
4. Explain all of the different weather conditions
anticyclones bring in;
• Winter
• Summer
5. Describe and Explain what is happening in
figure 9.48. Mention what is happing in the
upper Westerly flow.
The source of air in an anticyclone is the upper atmosphere, where the amount of available moisture is limited
The air starts to sink towards the Earth’s surface.
As the air sinks towards the Earth’s surface......
Because air sinks over a wide area there are few variations in pressure so
Demonstrate understanding
• Complete the heat wave research task on
anticyclones that is on the Geog web.
Homework
• Complete the reading sheets on El Nino
and Hurricanes
• Complete the anticyclones web task.
• June 2003
• Outline the conditions which lead to the
formation of mid-latitude depressions. (5)
• Examine the varied impacts of mid-latitude
depressions on the weather of the British
Isles. (20)