The Met Office has issued a yellow weather warning for heavy rain affecting parts of the UK today, particularly in the South West and south Wales. The warning, which began at midnight and lasts until 2pm, spans a significant 14 hours. Areas to the south and west of London are expected to experience travel disruptions due to the forecasted downpours.

Residents in regions such as Devon and Cornwall could see as much as 60mm of rain within just a few hours, which is nearly a month's worth of rainfall. The Environment Agency has also issued flood alerts, advising the public to remain vigilant as river levels are monitored closely.

Rebekah Hicks, chief meteorologist at the Met Office, stated, "We're expecting a band of heavy rain and strong winds to move north-east through the first part of Wednesday, followed by heavy showers and the risk of thunderstorms. Some of these could bring hail and gusty winds, particularly in southern areas."

The warning encompasses a wide area, wrapping around London and affecting regions such as Berkshire and Buckinghamshire. While London itself is not under an official warning, residents can expect grey skies and rain throughout the day, with temperatures peaking at 21C.

The Met Office has cautioned that flooding of homes and businesses is possible, along with potential interruptions to power supplies and travel services. Roads may become hazardous due to spray and flooding, leading to longer journey times for commuters.

In addition to the rain, coastal gales are anticipated, particularly along the English Channel, where winds could reach up to 50mph. The Met Office advises individuals to check local weather forecasts and road conditions before travelling, and to prepare for possible flooding by having an emergency flood kit ready.

Looking ahead, the weather is expected to improve by Friday, with dry and sunny conditions forecasted. However, further rain is anticipated on Thursday, particularly in the morning. Residents are encouraged to stay informed about changing weather conditions as the situation develops.