Many conditions need to be present for a tornado to form but, when these conditions are met, a violently whirling mass of air, known as a vortex, forms beneath the storm cloud.A funnel cloud usually develops as the vortex forms due to the reduced pressure in the vortex. "Robert Morrison, Caledonian MacBrayne's director of operations, said: "Weather for the weekend is looking extremely problematic as far as delivering a scheduled timetable. They can be over 2 miles (3.2 km) wide, track for over 60 miles (100 km) and have wind speeds in excess of 300 mph (480 km/h).A large, violent tornado passing through a populated area can lead to total destruction of buildings and property in its path and sometimes loss of life. The tornado then moves across the surface causing severe damage or destruction to objects in its path.A tornado typically has the form of a twisting funnel-shaped cloud between the cloud base and the ground. In the spring and summer, warm air from the Gulf of Mexico meets cool air from Canada in this region, and this leads to the formation of powerful storms known as supercells that, if the conditions are right, can spawn tornadoes.Around 30 tornadoes a year are reported in the UK. This is the shocking moment a mini-tornado was captured in video. Part of the roof collapsed at The Venue bar and nightclub in Perth A funnel cloud was also spotted over Hatton of Fintray shortly after 11am and shows the cone-shaped cloud reaching towards the ground.

Wind speeds typically range from 75 to 100 mph (120 to 180 km/h). "Once the storm passes, we'll inspect both routes with locomotives on Monday at first light for obstructions before reopening. Most tornadoes, although they produce damaging winds, do not lead to the widespread devastation often associated with these weather events in the media. Tornado damage is localised; limited by the track of the tornado. "We will of course be looking keep sailings running when conditions allow. Tornado damage is localised; limited by the track of the tornado.Tornadoes occur in many places around the world, but North America is the continent where they occur most often. Strong inflowing winds intensify, and the spin rate increases as the vortex stretches vertically.
It comes after a yellow weather warning was issued for most of the country including … Ferry services have been affected by the weather A mini-tornado ripped apart a garage in what firefighters described as ‘like a scene from The Wizard of Oz' as Britain was on snow and flood alert. Scotland is on flood alert as rain and high winds sweep in with the onset of Storm Ciara. These are external links and will open in a new window The meteorological phenomena took place in Perthshire, Scotland. They form in very unsettled weather conditions as part of severe thunderstorms. "Network Rail said that winds of up to 90mph were expected on the West Highland Line.The company tweeted: "We expect extreme winds of 80-90mph to affect the West Highland Line & Inverness - Kyle of Lochalsh tomorrow.

Services will be suspended on those routes during the worst of the weather tomorrow. We are doing all we can to keep our customers moving despite the effects of Storm Ciara.
"There is a very high possibility of weather related disruption to services across all 28 of our routes so people should be aware of this before setting off on their journey. The most violent tornadoes are rarely seen anywhere but the USA, Canada and Bangladesh. Tornadoes typically spin anticlockwise in the Northern Hemisphere (cyclonically).Tornado size and intensity vary greatly.