Pressure Systems

Question 1

High pressure

Rotation

Answer 1

Anticyclone, warming up of the air by compression
Clockwise in northern hemisphere
Ridge, wedge, line of high pressure

Question 2

Low pressure 1

Rotation

Answer 2

Anti clockwise and inward movement
Convergence, rising air, adiabatic cooling
Trough line, line of low pressure
Isobaric through, extends to other pressure system

Question 3

Low pressure 2

Answer 3

Orographic low, due to terrain, leeward side

Polar depression, water doesn’t cool as fast as air
Cold air over warm sea typically

Thermal depression: intense heating of ground surface, rising air, low pressure system forms

Question 4

Warm high

Answer 4

Surface high pressure with warm air at the middle, bubble upward
–> true alt increase

Question 5

Cold high

Answer 5

Surface high pressure with cold air at middle

Question 6

Blocking high or anticyclone

Answer 6

Powerful high pressure blocking weather

Question 7

Temporary cold anticyclone

Answer 7

Super cold high pressure system blocking the progress of the incoming warm air.

Question 8

Flat pressure gradient system

Answer 8

Isobars are widespread
Low wind conditions
Winter: Low clouds, fog, poor visibility
Summer: heat TS