http://news.bbc.co.uk/1/hi/world/europe/6914490.stm#maps
In a 'normal' summer, the Atlantic jetstream directs areas of low pressure, which bring cloud and rain, to the north of the UK. High pressure systems over Europe and the Atlantic bring warm, settled conditions.
Pressure chart: 29/6/06. Source: Met Office
This summer, the jetstream is flowing further south allowing low pressure systems to sweep straight over the centre of Britain. It is also pulling in warmer air from the sub-tropics and Africa which is sweeping over south-eastern Europe.
Pressure chart: 24/07/07. Source: Met Office
Up to 500 people have died in the past week from a heatwave in Hungary, a top health official has said.
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