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Around 30mm to 40mm (1 to 1.5in) of rain is expected to fall in some areas, forecasters say, leading to a chance of flooding.
Usually in August, 63mm (2.5in) of rain falls across south-east England during the entire month.
A yellow warning for thunderstorms has been issued across a large part of the West Midlands and the South of England.
Met Eireann have named #StormBetty
This is the second named storm of this August and is likely to bring very strong winds 🌬️, and some heavy and thundery downpours 🌨️⛈️ to parts of the UK pic.twitter.com/fftgsPw74p— Met Office (@metoffice) August 18, 2023
The Met Office says there is a chance of travel disruption, with the possibility that some homes and businesses could be flooded or hit by lightning as well as a short-term loss of power.
The warning, stretching from Birmingham to London and the whole of the South East and Solent area, is in place from 06:00 BST until 12:00.
Meanwhile, in the coastal areas of north and mid-Wales there is a yellow warning for wind from midnight until 18:00.
High wind speeds also expected in Met Office warning
A period of strong easterly winds could see gusts reach up to 60mph, and more widely around 40-50mph.
The Met Office said: “Bus and train services could be affected and trees and temporary structures like marquees and tents could be damaged.”
Showers should begin to fall in the south-west of England and south Wales before growing in intensity as they move eastwards, according to Met Office meteorologist Rachel Ayers.
🌧️Showers moving northeastwards through the morning, with a risk of thunderstorms for parts of central and southern England 🌩️
💨Breezy, especially to the west of high ground and along western coasts
🌤️Best of the sunshine in northwest Scotland pic.twitter.com/VVmytfDJ8H
— Met Office (@metoffice) August 17, 2023
“Given it is the summer holidays people are more likely to want to be outside and travelling for holidays,” she said.
“There is a chance we could see driving conditions affected, leading to longer journey times.
“Take the advice from our partners such as the RAC with regards to driving in heavy rain if you do make that journey.”
Conditions should brighten up on Saturday with sunshine, accompanied by showers and blustery conditions, with heavy rain likely to be confined to north-east Scotland.
