The site records the wind strength of hurricane and tropical storm winds, and strike probabilities.

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The hurricane is expected to have wind strength of around 65 mph, according to National Weather Service.

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The wind gains strength from the thermal energy of the ocean, eventually condensing vapors and circulating air fast enough to form high-speed wind and heavy rain.

CNN: graphic

The researchers then used this "proxy" to assess the probable strength of wind needed to produce those features.

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The offshore project, called Neart na Gaoithe (meaning "strength of the wind" in Gaelic), would occupy an area of around 65 sq miles.

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The Met Office's "feels like temperature" takes into account expected air temperature, relative humidity and the strength of the wind at around 5 feet (1.5m) - the typical height of a person's face.

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Tornados are rated on several scales for strength based either on wind speed, pressure drop, or damaged caused, but the updated Enhanced Fujita Scale is the presently accepted scale in the United States.

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The strength and direction of the wind plays a big part.

BBC: HOW FULL BORE EVENTS UNFOLD

Group member Paul Madden said visitors to the island had also signed the petition but the strength of feeling about the wind turbines issue was such that group could "easily have doubled" the number of signatures.

BBC: 8,000 sign Anglesey petition against wind turbines

The most persuasive evidence that Voyager 1 has crossed the termination shock is its measurement of a sudden increase in the strength of the magnetic field carried by the solar wind, combined with an inferred decrease in its speed.

BBC: Voyager impression (Nasa)