Hundreds of homes are without power and there is travel disruption as Storm Callum sweeps across Wales.
The Met Office issued an amber warning for heavy rain from Friday morning into Saturday, while most of the rest of the country is covered by a yellow warning.
Winds hit 72mph (116km) at Capel Curig, Conwy, with 15mm (0.6in) of rain falling in three hours near St Davids.
The flood alerts, meaning flooding is possible, are in place in south Wales, including in Cardiff and Swansea.
More than 1,000 homes in Northern Ireland are also without power, while dozens of flights at both Belfast City and Dublin airports have been cancelled.
The A465 Heads of the Valleys road is closed at Hirwaun, Rhondda Cynon Taff, causing about two miles of congestion.
Homes were left without power on Friday morning, with hundreds of properties in Neath Port Talbot, Carmarthenshire, Swansea and Pembrokeshire affected, along with the Whitchurch and Llanishen areas of Cardiff.
Bryngwran School on Anglesey was also closed due to a lack of electricity.
Arriva Trains Wales said a bus replacement service was in place for commuters from Llandudno Junction to Blaenau Ffestiniog in Gwynedd, while trains between Swansea and Carmarthen and Aberystwyth and Newtown have been cancelled on Friday morning.
The A55 Britannia Bridge between Anglesey and the mainland has been closed to high-sided vehicles and the speed restricted to 30mph, while one lane is shut on the M48 Severn crossing.
The A5 at Llanfairpwllgwyngyll and the A454 at Beaumaris on Anglesey have reopened after fallen trees closed both of the roads on Friday morning.
Amber warnings can mean:
- Spray and flooding leading to difficult driving conditions and some road closures
- Delays and cancellations to some train and bus services are likely
- Fast flowing or deep floodwater is likely
- Homes and businesses could be flooded, causing damage to some buildings
- Some communities could be cut off by flooded roads
- Power cuts and loss of other services to some homes and businesses are likely
- Yellow warnings are issued for less severe weather
The worst of the rain is expected to be on south and south-facing hills, with 120mm to 160mm (4.7in to 6.3in) predicted, according to the Met Office.
The yellow warning for wind affects the west of the country and is likely to cause problems on road, rail and ferries.
Meanwhile, the majority of Wales is covered by a yellow warning for rain and motorists have been warned to be prepared for poor driving conditions.
Dyfed-Powys Police has urged motorists to take care on rural roads, particularly on mud run-off near gateways.
Ferry crossings to Ireland are expected to be heavily disrupted. Irish Ferries has cancelled all crossings between Holyhead and Dublin until 14:30 BST on Friday, while Stena Line has also cancelled services.
North Wales Police has tweeted about a fallen tree and phone line causing problems on Bethel Road, Caernarfon, Gwynedd.
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