shw[24] - jet stream for wet and cool summer 2024

The air masses affecting weather the UK experienced in summer 2024.
The white "streak" marks the junction between the two zones indicated, and is [very approximately] the route of the upper air "jet" stream - which tends to pull weather systems across into Europe. The wiggles in the jet stream tend to determine if the air masses are cooler or warmer - air flowing to the UK from the south tends to be warmer than that from the north.
.
Not my Image : fair use & public education