Between 18:00 Mon 17th and 12:00 Tue 18th
Storm Helene is expected to bring a period of very strong winds to western parts of the UK late Monday and for a time on Tuesday.
What to expect
Injuries and danger to life from flying debris are possible.
Road, rail, air and ferry services may be affected, with longer journey times and cancellations possible.
Some roads and bridges may close. Fallen trees may be an additional hazard.
There is a small chance that injuries could occur from large waves and beach material being thrown onto sea fronts.
There is a chance that power cuts may occur, with the potential to affect other services, such as mobile phone coverage
Further details
Storm Helene is expected to push north-east towards the UK late Monday, before clearing quickly to the north of Scotland through Tuesday morning.
There remains large uncertainty in Helene's exact track, however a spell of very strong winds is expected, initially for parts of south-west England and west Wales, then later south-west Scotland and the south-east of Northern Ireland.
Winds are likely to gust to 55-65 mph quite widely in the warning area, with possible gusts of 70-80 mph in exposure.