Some rail services have already been disrupted.
The Conwy Valley and Heart of Wales lines – which run from Llandudno to Blaenau Ffestiniog and Swansea to Shropshire, via Carmarthenshire and Powys, respectively – will be closed on Saturday and Sunday because of the storm’s expected impact.
Replacement road transport will be in place for the duration.
Other lines are so far operating as normal, but passengers have been advised to check before they travelled.
On the roads, the M48 Severn Bridge has been closed in both directions due to strong winds.
And speed restrictions are in place on the A55 Britannia Bridge between Anglesey and the mainland.
Irish Ferries’ Saturday crossings between Pembroke Dock and Rosslare have been cancelled and Stena Line’s services between Fishguard and Rosslare.
