The downpour that swept through West Berkshire yesterday (Tuesday) is set to continue after the Met Office extended its warning a further 12 hours.
The Met Office first warned of a 24-hour deluge yesterday morning but the yellow warning for rain - meaning be aware, is now in effect between 12pm and 10pm today.
Forecaster's said: "Further heavy showers will occur across some central and southern parts of England and also southeastern parts of Wales.
"Some of these showers will become slow moving, with hail and thunder possible.
"Be aware of the potential for localised surface water flooding and difficult driving conditions."
The warning, which covers the whole of West Berkshire, comes as major traffic delays have been reported around the district following an earlier road accident which has closed parts of the M4.
The Thatcham Weather Station reported almost 30mm of rainfall in just a few hours today.
A flood alert has since been issued on the River Pang from East Ilsley to Pangbourne and Sulham Brook following two hours of intense rainfall in Newbury town centre.
The Environment Agency said: Property flooding is not currently expected. However, levels on the Pang and Sulham Brook have risen steadily in response to recent rainfall.
"These watercourses will remain responsive to further rainfall and flooding of low lying land and roads is possible this afternoon.
"The weather prospects are for further isolated but heavy showers across large parts of Southern England through this afternoon and evening."
One platform at Newbury Rail Station has also been closed with travel disruption expected as rush hour gets underway.
A spokesperson for Great Western Railway, James Davis, said: "Due to flooding, platform 1 at Newbury is currently out of use.
"Where possible, customers are advised to give themselves extra walking time to catch services from platform 2.
"Trains departing from alternative platforms as per timetabled."
Park Lane in Hamstead Marshall, near to the Milkhouse Road Junction, is reportedly blocked on both directions due to flooding.
West Berkshire residents have also taken to social media following the downpour.
One local resident, Paul Hilton, took to Twitter to say: "Burys Bank Rd at junct with Crookham Hill. Badly flooded. 1 car at a time wading thru it."
Another, Pauline Bellman, wrote on the Newbury Today Facebook site: "Rain all day yesterday and night, three hours dry this morning, now it is hammering down again."
Have you been affected by the flooding? Get in touch with any pictures to: email@example.com