Heavy showers already affecting the south and east of the Isle of Wight will become more widespread across the warning area through the afternoon, with some thunderstorms also developing. These may be quite slow-moving and last for an hour or two.
Some torrential downpours are possible with a few places seeing 50 mm of rain or more within a few hours. Lightning and hail are also additional hazards. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings