Showers on Friday evening will become more frequent overnight with spells of more persistent showery rain developing after midnight, extending further east through Saturday morning. The rain will be often heavy with a risk of hail, lightning and gusty winds.
Be aware of the likelihood of localised surface water flooding and difficult driving conditions.
Rain and showers will become less heavy towards late afternoon before clearing during the evening.An area of low pressure will drift slowly eastwards through Saturday, bringing heavy showers and more organised bands of showery rain. Cold air passing over the sea, which is still relatively warm in early October, will release large amounts of energy leading to a risk of thunder and hail, especially over coastal counties of south Wales. 30 mm rainfall is possible in 2-3 hours in places, with some locations perhaps seeing 40 mm in less than 6 hours. This brings a risk of surface water flooding, whilst hail, lightning and gusty winds may present additional hazards.The public is advised to take extra care, further information and advice can be found here: http://www.metoffice.gov.uk/public/weather/warnings/