A rare red weather warning has been issued for the Vale of Glamorgan coast ahead of Storm Darragh on Saturday morning.
The Met Office says extremely strong winds will develop during the early hours, with gusts of 90mph or more possible over coasts and hills in south and west Wales.
They're also expected to funnel through the Bristol Channel with some very large waves on exposed beaches.
The strongest winds will begin to ease from late morning - with the red warning expiring at around 11am, although it will remain very windy with an amber warning for strong winds in force across the Vale until 9pm, with gusts of up to 70-80mph around exposed coasts and headlands.
Forecasters say the "damaging winds" are expected to cause "significant disruption" and there is a "danger to life" due to flying debris.
Power cuts and travel disruption are also possible, along with damage to buildings and homes.
Met Office chief forecaster Jason Kelly said: "The worst impacts from Storm Darragh will be felt as we go through the early hours of tomorrow morning and throughout Saturday with, in addition to the broad yellow warning, red and amber wind warnings in place from 1 am tomorrow."
He added: "Although there is a lower likelihood of impacts outside of the red and amber warning areas, this doesn’t mean you won’t see them. We are likely to see impacts across the whole of the country and people should keep an eye on the latest forecast details and prepare for the bad weather, especially if planning to be out and about on Saturday."
"Some areas are likely to have a relatively quiet start to Saturday, weather-wise, but winds will quickly increase from the west through the day."
An amber warning for heavy rain has also been issued for the entire county, running from 3am until 6pm on Saturday, with as much as 80-90mm expected throughout.
Dale Hipkiss, duty manager at National Highways, added: "If you're planning to drive over the next few days, prepare in advance for the journey and take extra care on the roads."
"If weather conditions become challenging, adjust your driving behaviour to manage the conditions as safely as possible. It’s also a good idea for drivers to check their vehicles, such as tyres, coolant and oil levels, before heading out to reduce the risk of breakdowns."
Cardiff Airport is advising passengers to take extra care and add extra time to their journey before travelling, while the RNLI is advising people living near or visiting the coast to take extreme caution.
In terms of sport, the FAW has ordered all of Saturday's league fixtures to be postponed - including Barry Town United's televised Cymru Premier game at Bala Town and Llantwit Major's home clash with Penrhiwceiber Rangers in the Cymru South.
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