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Fresh weather warnings have been issued for London as forecasters say the south-east is to be hit by more torrential downpours.

The Met Office issued a yellow warning for rain as thunderstorms are to spark more heavy showers today.

Tuesday saw the rain put a dampener on proceedings at Ascot, soaking racegoers and forcing thousands of female guests wearing eye-catching head pieces to hide under umbrellas.

It also delayed the start of play at Queen's Club in London for the tennis Aegon Championships and the bad weather is unlikely to ease until Friday at the earliest.

Forecasters said as much as 25mm could fall in an hour in parts of London and the surrounding area today.

Warnings are also in place for Thursday when lightning is an additional hazard.

Flooding in London 11 show all Flooding in London 1/11 Flooding in at The Bridge, Wallington Surrey 2/11 Submerged: a car after flash floods in south London Paul Jolly 3/11 Flooding under the railway bridge in Wallington Surrey Paul Murrihy 4/11 Flooding in Wallington Surrey Louise Garwood 5/11 Flooding in Wallington Surrey Daniel Robert Cotter‎ 6/11 Flooding in Wallington Surrey Louise Garwood 7/11 The river Wandle flooding into into a back garden https://www.facebook.com/groups/wallingtonsurrey/ Debbie Ritchie 8/11 Flooding in Wallington Surrey https://www.facebook.com/groups/wallingtonsurrey/ Rama S Jeyan 9/11 Flooding in Wallington Surrey @a_secker/PA 10/11 Flooding in Wallington Surrey @a_secker/PA 11/11 A car submerged in floodwater in Wallington, Surrey @a_secker/PA 1/11 Flooding in at The Bridge, Wallington Surrey 2/11 Submerged: a car after flash floods in south London Paul Jolly 3/11 Flooding under the railway bridge in Wallington Surrey Paul Murrihy 4/11 Flooding in Wallington Surrey Louise Garwood 5/11 Flooding in Wallington Surrey Daniel Robert Cotter‎ 6/11 Flooding in Wallington Surrey Louise Garwood 7/11 The river Wandle flooding into into a back garden https://www.facebook.com/groups/wallingtonsurrey/ Debbie Ritchie 8/11 Flooding in Wallington Surrey https://www.facebook.com/groups/wallingtonsurrey/ Rama S Jeyan 9/11 Flooding in Wallington Surrey @a_secker/PA 10/11 Flooding in Wallington Surrey @a_secker/PA 11/11 A car submerged in floodwater in Wallington, Surrey @a_secker/PA

The chief forecaster said: "Rising temperatures will trigger slow-moving heavy showers and thunderstorms.

"Once again, 15mm-25mm are likely to fall within an hour in scattered locations, bringing the risk of flooding, especially across urban areas."

The Environment Agency has issued 21 flood alerts indicating that flooding is possible, and warned people to be prepared.

The alerts cover areas in Cheshire, Merseyside, Derbyshire, Nottinghamshire, Northamptonshire, Oxfordshire, Buckinghamshire, the West Midlands, Staffordshire, Norfolk, Lincolnshire and north-west and north-east Greater London.

The Met Office added that further heavy and thundery showers are expected over the weekend.