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13 Cards in this Set

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Define depression
Area of low pressure which usually bring rain, cloud and wind
When do depressions occur
They occur when warm air meets cold air
How long does it take an average depression to pass over the British Isles
Between 1 and 3 days
What is a front
The point at which cold air meets warm air
How many fronts are there in a typical depression
Two;
the warm front being forced to rise over the cold air &
the cold front which follows undercuting the warm air in front of it.
What is the weather like along a front
Usually cloud and rain
What direction do strong winds blow in - clockwise or anti-clockwise
Anti clockwise
Why is there usually cloud and rainfall along a front
This occurs because the warm air cools and condenses when it meets the cold air.
Why do air masses have different densitites
Because they have different temperatures
Is warm air more or less dense than cold air
Warm air is less dense
What is the first sign of an approaching warm front
The formation of high thin clouds (cirrus)
As warm air rises does the atmospheric pressure fall or rise
Rapid fall
As cold air replaces warm air what happens to the temperature and atmospheric pressure
Temperature falls;
Atmospheric pressure rises