Depressions

1
Depressions
John Harris - Head of Geography - Radley College
- UK mjh_at_radley.org.uk http//atschool.eduweb.co.u
k/radgeog/
2
Depression stage 1

• Depressions form where a warm air mass eg
  Tropical Maritime
• meets a cold air mass eg Polar Maritime

3
Depression stage 2 maturity
Rain often occurs along the warm and cold fronts
where air rises, expands, cools and condenses
4
Warm front
5
Cold front
6
Depression - cross section
7
Depression stage 3 occlusion
The cold front eventually catches up the slower
moving warm front to form an occluded front.
8
Occluded front - cross-section