The jet stream is a powerful ribbon of fast-moving westerly winds located approximately 9 to 16 kilometers (30,000 to 52,000 feet) above Earth's surface in the upper levels of the atmosphere. Acting as a dynamic barrier between contrasting air masses, the jet stream plays a crucial role in shaping global and regional weather patterns.
In the UK the position and strength of the jet stream are particularly significant during the winter months. When it is strong and situated close to the British Isles, it often directs low-pressure systems toward the region, resulting in unsettled and stormy conditions. Conversely, when the jet stream weakens and shifts southward, air masses from northern latitudes can dominate, leading to colder and calmer weather periods.
Understanding the behavior of the jet stream is key to predicting long-term weather trends and preparing for sudden shifts in conditions.
The following weather forecast charts are often requested
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