The Met Office has said a tornado could hit western parts of the UK amid Storm Isha.
A "tornado watch" zone was issued for Northern Ireland, as well as parts of Scotland and northern England by the Tornado and Storm Research Organisation (Torro) earlier today.
The warning means a “strong tornado” is possible in those regions.
Met Office forecaster Marco Petagna said: "There is a potential that we could see the odd isolated tornado largely tied in with the squally cold front mainly in western parts of the UK on Sunday evening.
Storm Isha is causing travel chaos across the country
PA
“They can cause some significant damage but often on a very localised scale, they often don’t tend to last very long."
Meanwhile, Network Rail said 50mph speed restrictions will be imposed across most routes as a precautionary safety measure.
Amber warnings for wind have been issued for the majority of the UK.
These warnings are expected to remain in place until 6am tomorrow, Monday.
Commuters waiting at London Euston
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ScotRail ceased rail services early on Sunday and confirmed there would be no Monday morning rush-hour services.
Air traffic control restrictions are in place, leading to some flight cancellations.
A spokesperson from British Airways said: "Like other airlines, we have had to make schedule adjustments due to the adverse weather conditions across the UK and Europe caused by Storm Isha.
"We’ve apologised to our customers for the disruption to their travel plans and our teams are working hard to get them on their way as quickly as possible."
A message displayed on the big screen informing supporters of rail service suspensions due to Storm Isha during the Scottish Cup fourth round match at Celtic Park, Glasgow.
PA
Storm Isha marks only the second time in a UK storm season that the letter I has been reached in the alphabet.
Storm seasons run from the start of September to the end of the following August.