Chapter 12- Fronts and Depressions

Question 1

42.26.2

Explain what is meant by synoptic meteorology.

Answer 1

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Question 2

42.26.4
Define “air mass” and state the three properties that determine the uniformity of an air
mass.

Answer 2

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Question 3

42.26.6

Explain what is meant by “source region” and; (a) state the location of the predominant global source regions;

Answer 3

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Question 4

42.26.6
Explain what is meant by “source region” and; (b) describe how (source region) anticyclones facilitate air masses to absorb the characteristics of the source region.

Answer 4

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Question 5

42.26.8
List the types of air masses and describe the main characteristics, and typical
meteorological conditions, of each.

Answer 5

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Question 6

42.26.10

Explain what is meant by air mass modification.

Answer 6

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Question 7

42.26.12
Describe the likely weather conditions experienced in Equatorial and Continental
regions during: (a) cold advection;

Answer 7

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Question 8

42.26.12
Describe the likely weather conditions experienced in Equatorial and Continental
regions during: (b) warm advection.

Answer 8

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Question 9

42.26.14

Explain the concept of convergence and divergence.

Answer 9

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Question 10

42.26.16
Explain what is meant by “vorticity advection” and describe its influence on the
formation and development of pressure systems and fronts.

Answer 10

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Question 11

42.26.18
With respect to depressions found in mid latitudes of the southern hemisphere, describe
the development and associated cloud of: (a) the typical mid latitude depression;

Answer 11

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Question 12

42.26.18
With respect to depressions found in mid latitudes of the southern hemisphere, describe
the development and associated cloud of: (b) the polar depression;

Answer 12

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Question 13

42.26.18
With respect to depressions found in mid latitudes of the southern hemisphere, describe
the development and associated cloud of: (c) sub tropical depression.

Answer 13

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Question 14

42.26.20
Describe the effect of the following on the intensity of fronts, and on the extent of
cloud and precipitation: (a) amount of moisture in the warm rising air;

Answer 14

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Question 15

42.26.20
Describe the effect of the following on the intensity of fronts, and on the extent of
cloud and precipitation: (b) stability or instability of the rising air;

Answer 15

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Question 16

42.26.20
Describe the effect of the following on the intensity of fronts, and on the extent of
cloud and precipitation: (c) the slope of the front;

Answer 16

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Question 17

42.26.20
Describe the effect of the following on the intensity of fronts, and on the extent of
cloud and precipitation: (d) the speed of the front;

Answer 17

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Question 18

42.26.20
Describe the effect of the following on the intensity of fronts, and on the extent of
cloud and precipitation: (e) the temperature contrast across the front.

Answer 18

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Question 19

42.26.22

Interpret the symbols commonly used to denote frontal weather on international charts.

Answer 19

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Question 20

42.26.24
Describe the sequence of events with the passage of the ‘idealised’ cold front and warm
front in both hemispheres in terms of: (a) pressure trend;

Answer 20

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Question 21

42.26.24
Describe the sequence of events with the passage of the ‘idealised’ cold front and warm
front in both hemispheres in terms of: (b) temperature trend;

Answer 21

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Question 22

42.26.24
Describe the sequence of events with the passage of the ‘idealised’ cold front and warm
front in both hemispheres in terms of: (c) cloud;

Answer 22

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Question 23

42.26.24
Describe the sequence of events with the passage of the ‘idealised’ cold front and warm
front in both hemispheres in terms of: (d) precipitation;

Answer 23

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Question 24

42.26.24
Describe the sequence of events with the passage of the ‘idealised’ cold front and warm
front in both hemispheres in terms of: (e) visibility;

Answer 24

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Question 25

42.26.24
Describe the sequence of events with the passage of the ‘idealised’ cold front and warm
front in both hemispheres in terms of: (f) dew point trend;

Answer 25

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Question 26

42.26.24
Describe the sequence of events with the passage of the ‘idealised’ cold front and warm
front in both hemispheres in terms of: (g) relative humidity trend.

Answer 26

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Question 27

42.26.26

Explain factors involved in the formation and development of: (a) warm occlusions;

Answer 27

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Question 28

42.26.26

Explain factors involved in the formation and development of: (b) cold occlusions.

Answer 28

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Question 29

42.26.28

State the typical weather conditions during the passage of a warm sector depression.

Answer 29

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Question 30

42.26.30

Explain the associated weather, and factors involved, in the formation and development of (a) an orographic depression;

Answer 30

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Question 31

42.26.30
Explain the associated weather, and factors involved, in the formation and development of (b) a thermal (heat type) depression.

Answer 31

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