Homes have been flooded in Pontypridd, four train lines are blocked and bus services are delayed.
Image source, Met OfficeHeavy rain and strong winds across Wales has caused power cuts and flooding to properties and roads.
The National Grid says 110 homes in Wales are without power.
South Wales Fire and Rescue Service says five of its crews are dealing with flooding incidents, with Porth and Pontypridd, Rhondda Cynon Taf as the worst affected areas.
A yellow rain warning remains place until 17:00 GMT on Thursday across 16 of Wales’ 22 counties.
The fire service added that a number of hillside and low-lying properties have been affected from run-off water and blocked culverts.
Natural Resources Wales has issued 26 Flood Warnings and 45 Flood Alerts as of 07:00 GMT on Thursday.
They said there is no widespread flooding from major rivers at present.
Dairy farmer Abi Reader from Wenvoe, in the Vale of Glamorgan, described overnight conditions on her farm.
“It’s been a wild night,” she told Radio Wales Breakfast.
“We’ve had electricity flickering on and off. The milking parlour had about a foot of water in it which we’ve had to pump out.
“There is flooding on the roads, we’ve got about 3 inches of water rolling across the roads.”
Meanwhile, the National Grid said power outages include 37 customers who have lost supply in the Llanelli area and 34 without power in Kenfig Hill, Bridgend.
Image source, Getty Images
Among the flood warnings in place from Natural Resources Wales, there are eight warnings for stretches of the River Severn in north Powys, four warnings for different stretches of the River Taff from Merthyr Tydfil to Pontcanna in Cardiff, and three warnings on the River Cynon.
The M48 Severn Bridge is closed in both directions between Chepstow and Aust in Gloucestershire.