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Rain to return this week with chance of thunderstorms and flooding
Forecasters said 15mm to 20mm could fall in an hour, with thunderstorms and hail also expected to disrupt travel and services.
The Met Office issued yellow thunderstorm warnings across England and Wales for Wednesday and Thursday, anticipating intense rainfall that could bring travel disruption and flooding after a summer of record-breaking heatwaves.
Baked ground from summer's heatwaves struggles to absorb water, significantly increasing surface flooding risk as heavy rain falls, according to Met Office senior meteorologist Craig Snell.
Forecasters expect accumulations of 20-30 mm in three hours, with up to 50 mm possible over 12 hours in some locations, creating hazardous conditions involving lightning and hail.
Motorists face hazardous driving conditions, with heavy showers potentially disrupting travel across the Bank Holiday weekend, as the Met Office warns of sudden flooding and power cuts.
Drier, brighter conditions are expected to return over the weekend, with sunshine forecast for parts of the South on Monday as unsettled weather continues into September.