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The Met Office says the alert - which includes danger of 'flooding and disruption' will be in place from 12pm until 8pm on Tuesday, with the potential for road closures and power cuts.
London and the south-east have been slapped with a yellow weather warning for thunderstorms, with the Met Office warning of a danger of 'flooding and disruption' from 12pm until 8pm on Tuesday.
Forecaster Simon King told BBC R4 Today that 30C remained a possibility, sparking hopes for another sunny day.
Forecasters believe the UK has experienced the last of the heatwave as they expect cooler temperatures, heavy rain and even frost to come.
After a weekend of 30C heat, some parts of England, Scotland, and Northern Ireland are expected to see some grass frost soon, according to the Met Office, which has warned about cooler temperatures