Running at high altitudes, the jet stream is a fast-flowing river of air that acts as the thermal boundary between freezing polar drafts and warm tropical currents.
How the Jet Stream Steers Storm Systems
When the jet stream dips south of the UK, it steers low-pressure Atlantic storms straight over the British Isles, bringing sustained rain and wind.
Blocking Highs and Summer Heatwaves
If the jet stream curves north, it allows warm subtropical high pressure to settle over the country, bringing hot and sunny conditions.
Monitor high-altitude wind shifts. Track changes using UK Weather, and download the UK Weather application.
