The most violent tornadoes generally occur in North America.
Most violent tornadoes (F4 and F5) occur in the months of March-June.
Tornadoes are not "common" anywhere in Australia, but they do occur. They are more likely to occur in the southwestern region of Western Australia, and the southeast, such as southeastern South Australia and western Victoria, where temperature changes can be sudden and dramatic. they have also been known to occur in southeast Queensland, and northeastern New South Wales. On the whole, Australia-wide, tornadoes occur on an average of about 16 a year. These are nowhere near as violent and damaging as tornadoes in the USA.
Yes. Tornadoes as strong as F4 have been recorded in South Africa.
A tornado anywhere is a violent event. If you mean by the technical definition of a violent tornado, one rated EF4 or EF5, such tornadoes do occur fairly regularly in Tornado Alley, but make up a very small minority of the tornadoes that occur there. As with most places, most of the tornadoes in Tornado Alley are rated EF0 or EF1.
Violent tornadoes have been recorded in most states east of the Rockies. However, most of the violent tornadoes occur on the Great Plains in the central part of the country.
Yes, generally, they are, though that does not mean that Canada does not get violent tornadoes.
Violent tornadoes (those rated F4 and F5) most often strike in late spring or early summer. However, they can occur at any time of year.
The year with the most violent tornadoes on record was 1974, with a total of 36 tornadoes rated as violent.
Avalanches and tornadoes are both violent natural events that can be very deadly and destructive and can occur suddenly. Aside from that, they are completely different.
Weak tornadoes (EF0 and EF1) are by far the most common accounting for 89% of all tornadoes. Strong tornadoes (EF2 and EF3) are next, accounting for about 10% of tornadoes. Finally come violent (EF4 and EF5) tornadoes, which account for less than 1% of all tornadoes.
Tornadoes are more common than people realise in Australia, but they are not on the scale as that seen in parts of the US. There is no restriction on where they occur, as they have been reported during storms in each of the states, from sub-tropical Queensland down to dry South Australia.