Storm Betty to bring very strong winds to Wales
The Met Office is warning of very strong and gusty winds as Storm Betty moves in from the Atlantic.
A yellow wind warning covers parts of west and north-west Wales from 18:00 BST on Friday until 12:00 BST on Saturday.
Carmarthenshire, Ceredigion, Conwy, Gwynedd, Isle of Anglesey and Pembrokeshire are all affected.
Gusts of up to 70 mph (112km/h) are possible along the coast, the Met Office said.
The forecaster warned of injuries and danger to life due to large waves and beach material being thrown onto sea fronts, coastal roads and properties.
It said there could also be disruption to transport, damage to buildings, road closures, and power cuts.
"Given the time of year, with trees in full leaf, as well as likely temporary structures such as tents and marquees, some disruption is likely," said the Met Office.
"Impacts on high-sided vehicles and caravans are also likely."
Irish Ferries has cancelled two ferries from Dublin to Holyhead on Saturday due to the adverse weather conditions.
Storm Betty, named by Met Eireann, is also expected to bring severe weather to large parts of England, Northern Ireland and Scotland.
Analysis by Sabrina Lee, BBC Wales weather presenter
The strongest winds and gales will be in the west and north-west on Friday evening, overnight and into Saturday morning.
The winds will be strong enough to bring down a few trees and power cuts are possible.
In addition there will be heavy rain spreading across the country, with a risk of flooding and thunderstorms.
Whilst we have seen summer storms in the past, it is the time of year where trees are in full leaf and more temporary structures are around including tents and gazebos, creating additional hazards.
Better news for the weekend, with the weather gradually improving through Saturday with sunny spells and scattered showers.
One big reason why it's felt autumnal at times this summer is down to the positioning of the jet stream.
The rest of August looks changeable, with the chance of a heatwave for Wales looking slim.