Subtropical Anticyclones And Assosicated Weather

Question 1

Air in HP cells

Answer 1

Rotates anti-clockwise (SH)
Subsiding
Diverging

Question 2

High pressure belts affecting South Africa (3)

Answer 2

South Atlantic HP
South Indian HP
Kalahari HP

Question 3

South Atlantic HP affect

Answer 3

Cool, dry winds (stable air)
Blow onto south-western Cape

Question 4

South Indian HP affect

Answer 4

Warm, moist winds (unstable air)
Blow onto the east coast

Question 5

Kalahari HP affect

Answer 5

Greatest impact of SA’s climate.
Winter: causes clear skies and warm temperatures because the air is descending and dry.
Summer: causes only summer rainfall occurring on the plateau (KHP weakened by surface heating)

Question 6

Summer: Line thunderstorms and moisture fronts

Answer 6

Cool, dry air from Atlantic Ocean (SW) meets warm, moist air from Indian (NE)

Convergence occurs along the trough line/moisture front

Colder, dense, stable air from SW forces warmer air from NE to rise

Causes cumulonimbus clouds, heavy rain and thunderstorms

Question 7

Winter: coastal low pressures and berg winds

Answer 7

Coastal lows form off the west coast and move towards the east coast

Dry air from interior moves from KHP over the land towards the coastal low

Air descends the escarpment and warms adiabatically

Reaches the coast as a dry, warm Berg wind

Occur mostly during winter and often followed by a cold front