The tropical storm, which is now in the mid-Atlantic, is expected to track towards the United Kingdom over the next few days bringing a spell of windy weather on Monday and Tuesday.
"Helene is expected to bring a period of very strong winds to western parts of the United Kingdom late Monday and for a time on Tuesday", said the forecaster.
Some delays to road, rail, air and ferry transport expected. "Winds are likely to gust 40-50 miles per hour quite widely across the warning area whilst some coasts and hills of southwest England and Wales could have gusts of 55-60 miles per hour".
Experts expected the former hurricane to calm somewhat as it approached the United Kingdom but the Met Office has now sent out a "danger to life" warning as winds are set to hit speeds of up to 80mph.
Throughout Monday night Storm Helene will push north-east before clearing quickly to north Scotland on Tuesday morning.
- Cause some bus and train services affected, with some journeys taking longer.
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Some short term loss of power and other services.
A spokesman for the Met Office said: "Helene is still over the Atlantic but it's weakening and we're a lot more confident of what's going to happen".
"It's possible that the west coast of Wales and Cornwall could get some winds as well, but we will get a clearer picture of what to expect very soon".
Parts of Britain are expected to be battered with winds reaching as high as 65mph as Helene sweeps in from the west. The strongest winds then transfer northwards to be over northern England and, perhaps, the far south of Scotland, during the early hours of Tuesday.
Thursday is now looking like the better of the days with rain clearing to showers and winds easing light southwest to west for a time.