What’s a depression?
UNIT 5.5
Lesson objectives
You should be able to
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●
●
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Explain the term depression
Identify a depression on a weather chart and a satellite image
Outline how a depression forms
Describe the weather brought by a depression
Recap
● What is an atmospheric pressure?
● What is an area of low pressure?
● What is a weather front?
● What are warm front, cold front and occluded front?
● What is a coriolis effect?
What is a depression?
A depression is a low pressure system
that usually brings unsettled weather,
including strong winds, bands of
cloud and rain, and even snow in
winter.
You can recognise a depression on a
weather chart:
●
●
the isobars are below 1000mb and
are packed closer together
a warm front (red line) is followed
by a cold front (blue line)
Depressions
Handout - wb pg. 36
Diagram of a
depression
● How many weather
fronts are?
● Why are the fronts
moving from west
to east?
● Do you see many
types of clouds?
● What is the weather
like as the
depression passes?
How do depressions form?
*polar jet stream
https://drive.google.com/file/d/1iEmI9jii4w5t9E4YE7eY5f6bDr87fBcD/view?usp=drive_link
Complete Question 2 in your workbook handout pg. 36!
What
weather do
you expect
in a
depression?
What weather do you expect in a depression?
● The low pressure of a depressions causes clouds and rainfall to form.
● Depressions therefore bring unsettled weather and rain.
● Winds are normally stronger, shown by the isobars being closer
together.
● Depressions usually form over the Atlantic Ocean and are carried
across Britain by westerly winds and move in an anticlockwise
direction.
Quick review - WW exercise
https://wordwall.net/play/74234/291/182