The jet stream has been further north than usual allowing high pressure to develop without being swept away

Sweden

At least 11 wildfires are raging inside the Arctic Circle

UK

Amber ‘heat

health watch’ warning issued

High

pressure

Greece

Dozens killed by devastating wildfires

Direction of jet

stream

West-to-east winds

travelling at high-

speed at 25,000 feet

Sweden

At least 11 wildfires are raging inside the Arctic Circle

UK

Amber ‘heat

health watch’ warning issued

Direction of jet stream

West-to-east winds

travelling at high speed

at 25,000 feet

High

pressure

North

Atlantic

Ocean

Greece

Dozens killed by devastating wildfires