Weather warnings are in place following heavy downpours across Wales overnight.
43mm, an inch and a half, of rain fell overnight in Tredegar and downpours of 30 to 40mm are widely predicted.
Western Power Distribution told ITV Wales News that 4,500 customers in Wales were hit hit with a power cut. They said power was restored to them shortly before 5.30 pm.
The heavy rain caused a huge leak at a Waterstones bookshop in Swansea in Swansea, forcing it to close.
A staff member discovered a small flood at around 7.30am, but more heavy rain later caused the leak to burst which damaged hundreds of books.
This is the first time the store has shut early in around seven years. The last time was also due to a leak.
Swansea Branch Manager Steve Gain believes the Grade II listed building is vulnerable to flooding due to its flat roof.
The store has now reopened and plans to donate the books that can still be read to charity.
Elsewhere, CCTV captured the moment lightning struck a car in Wrexham. Footage shows a bright flash of light before sparks fly from the car...leaving the vehicle with its lights switched on.
Chloe Farrington, whose CCTV camera captured the moment, said she had thought ''a bomb had gone off.''
The RNLI has issued a warning with the strong winds and heavy rain expected to cause disruption into the weekend.
The Met Office has issued a yellow warning for rain which will be in place across the whole of Wales with the risk of flooding in places.
A warning of strong winds is in force until midnight Saturday.
The RNLI says the weather will create challenging conditions around the coastline with tidal surges, large surf and strong rip currents.