weather systems in mid- latitudes and their interaction with human environments i)frontal...
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Weather systems in mid-latitudes and their interaction
with human environments
i) Frontal depressions and associated weather
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Polar Front: occurs when Tm meets Pm, it is along this front that depressions form
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Life Cycle of a Depression
• Stage 1 : Embryo Depression- Waves form due to friction
between 2 air masses- Warm air bulges into cold air- As air rises it spirals
anticlockwise- The greater the diff bet the
warm & cold air masses, the stronger a depression develops
- Move NE due to upper westerlies (PFJS)
Tm
Pm
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Stage 2 : Mature Depression
-increased amplitude of wave-pressure continues to fall as warmssector is forced to rise-pressure gradient steepens-wind strength increases-rising air cools to dew point, large amount of latent heat released-clouds form, precipitation falls
Warm front – band of rain up to 150km wide
Cold front – greater intensity & shorterduration of rain (band only 10-50km wide) – Max wind strength due to greater temp difference
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Stage 3 : Decay Depression
-Cold front catches up the warm front toform an occlusion or occluded front
-No warm sector left at ground level
-Less uplift – less condensation – lesslatent heat – less ppt – less cloud – pressure rises – winds decrease
-Colder air replaces the uplifted air and ‘infills’ the depression
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High clouds : Ci – cirrus, Cc – cirrocumulus, Cs – Cirrostratus, Cb – Cumulo-nimbus
Middle clouds : Ac – altocumulus, As – altostratus, Cu – cumulusLow cloud : St – stratus, Ns – nimbostratus, Sc - stratocumulus
CLOUD ASSOCIATED WITH A DEPRESSION
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WEATHER ASSOCIATED WITH A DEPRESSION
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Bird’s eye view & cross section of depression
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Synoptic Chart & Satellite Image
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Synoptic Chart & Satellite Image
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Describe weather conditions at O & S.Explain why the weather is like this, think about - time, air pressure.
• Explain how and why weather conditions have changed.
• Why is O now 5 degrees warmer?
• How would weather conditions have affected activities on the ground over these tow days?
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‘The Great Storm’ 16 Oct 1987, read page 232-233 of text book plus handout materials. Make a list of the causes of the storm and the effects of the storm.
Complete the noting activities on the second page of handout.
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Complete Q,15, 16, 17, 18 on page 258 of your text book. Make sure you have enough detail to
cover the marks allocated.
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Tasks on depressions:
• 1. Complete Q,15, 16, 17, 18 on page 258 of your text book. Make sure you have enough detail to cover the marks allocated.
• 2. This task is very important, it looks at the effect that depressions have on peoples lives:
• ‘The Great Storm’ 16 Oct 1987, read page 232-233 of text book plus handout materials. Make a list of the causes of the storm and the effects of the storm. Complete the noting activities on the second page of handout.
• 3. Make a list of all the ways that a typical depression could affect people’s lives