Storm Claudia – named by the Spanish Meteorological Agency (AEMET) – has already brought heavy rain and strong winds to Spain and Portugal.
But rain associated with this storm will spread quickly north across England and Wales during Friday where it will stall and become persistent for most of the day.
Met Office Amber warnings have been issued for parts of south-east Wales from 12:00 to 23:59 GMT where up to 150mm of rain – nearly 6 inches – is possible over high ground.
An additional amber warning will also come in to effect for the same time across parts of east Wales, the Midlands and towards eastern England.
Widely 50-75mm (2-2.9in) of rain is expected throughout Friday with some places seeing up to 80mm (3in).
Difficult driving conditions and transport disruption is likely and some communities could be cut off from flooding.
A larger Met Office yellow severe weather warning has been issued elsewhere across England and Wales that will come into force from 06:00 GMT Friday, lasting through until Saturday at 06:00 GMT.
Around 30-50mm (1.2-2.9in) of rain is expected quite widely which may also bring some localised flooding and transport disruption.
Strong south-easterly winds will accompany the rain.
Additional yellow warnings for the wind have been issued for the far north-west of Wales and the Pennines.
Gusts up to 50-70mph (80-113km/h) could bring some minor damage and disruption.
