The Met office has issued a Yellow warning (high impact) of localised flooding, and Londoners are warned that storms are likely to be 'intense' .
However, the weatherman says where the heaviest rainfall will be concentrated is uncertain at the moment.
The Chief Forecaster's assement is: "Warm, humid air is likely to be pulled northwards from France late on Friday and during Saturday.
"Within this air mass, there is an increasing likelihood that heavy, thundery showers will break out. "
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