Sky's weather producer Jo Robinson said the second named storm of the season, caused by a "weather bomb" of low pressure in the Atlantic, will be a "mature" storm by the time it reaches Ireland on Saturday morning.
"The south and west of Ireland may see up to 80mph gusts in coastal parts early on Saturday, with an orange 'be prepared' warning issued by Met Eireann (Ireland's meteorological office).
"Along with the strong winds, large waves and coastal flooding will be a concern," she said.
"Much of Wales and southern and western England can expect gusts widely reaching 45 to 55mph, perhaps up to 70mph in coastal parts," she added.
A flood alert has been issued for Saturday morning for the west coast of Dorset.