How a heat dome forms and its effect on the jet stream

1

Hot air is blown in from the sea and meets existing warm summer conditions on land

2

The hot air tries to rise but is trapped and compressed by atmospheric high pressure

Atmospheric

high pressure

Compressed hot air

Hot air

rises

Heat intensifies within the ‘dome’

Not to scale

3

The heat intensifies within this ‘dome’, to the point where it diverts the jet stream

Canada

Jet stream

Heat dome

US

4

Heat dome has diverted jet stream northwards, preventing cooler temperatures coming south

1

Hot air is blown in from the sea and meets existing warm summer conditions on land

2

The hot air tries to rise but is trapped and compressed by atmospheric high pressure

3

The heat intensifies within this ‘dome’, to the point where it diverts the jet stream

Atmospheric

high pressure

Hot air rises

Compressed hot air

Heat intensifies within the ‘dome’

Not to scale

4

Heat dome has diverted jet stream northwards, preventing cooler temperatures coming south

Canada

Jet stream

Heat dome

US

Pacific Ocean

Atlantic Ocean