Yellow warnings for wind and heavy rain have been issued for much of Wales and southern England as Storm Herminia hits parts of the UK.
The Met Office says Herminia – first recorded in Spain and France – brings with it the possibility of damage and disruption, days after Storm Éowyn left two people dead when it battered the UK and Ireland.
Heavy showers and thunderstorms are expected to continue across the UK on Monday, but there is particular concern for flooding in parts of Wales and southern England.
Strong winds have already brought power cuts to thousands in south-west England, while flooding led to a major incident being declared in Somerset.
One Met Office yellow weather warning is in force across southern England until 10:00 GMT on Tuesday and another across south-west Wales until 21:00.
Forecasters warn there could be some flooding, including more rapid flash flooding with the thunderstorms.
A rain warning is also in place until 6am tomorrow covering London as up to 20mm of rain could fall. Forecasters say this increases the chance of flooding in some areas.
There was a flood warning in place for the Ravensbourne tributary of the Thames in South East London. This affects Lewisham and surrounding areas.
Gusts are expected to reach 70mph or more around exposed coasts, while areas inland can expect wind up to 50mph.
This could cause damage to buildings, such as tiles coming off roofs, and cause disruption to transport.