It is unclear what you mean by "how long" a mile wide tornado produces damaging winds in a roughly circular diameter of one mile (1.6 km). Such large tornadoes tend to last longer than smaller ones, often more than half an hour.
The path of a tornado is usually less than a mile wide, with most tornadoes ranging from 50 to 100 yards wide. However, some very large tornadoes are over a mile wide, and a handful of tornadoes have had paths over 2 miles wide.
Thus Tuscaloosa-Birmingham tornado of 2011 varied in width, but at its maximum the tornado was about a mile and a half wide.
Tornadoes can vary in width from as little as 10 yards to over a mile wide. The length of a tornado can range from a few hundred yards to over 50 miles, with most tornadoes typically travelling a path of a few miles.
It varies. The average tornado is 50 yards wind, but some are under 10 yards wide. Very large tornadoes can be up to a mile wide or more at the ground. The widest tornado ever recorded was 2.6 miles wide.
The average tornado is about 50-200 feet wide and can vary in height from a few feet to over a mile, with an average height of about 100 feet. However, tornadoes can range greatly in size, with some reaching widths of over a mile and heights of several miles.
The Tri-State tornado had a path of 219 miles long and 3/4 mile to 1 mile wide across 3 states and numerous mining towns.
The Tri-State tornado was a mile wide and traveled 219 miles.
The Waco tornado of 1953 was about one third of a mile wide.
The Joplin, Missouri tornado of May 22, 2011 tornado was 3/4 mile to 1 mile (1.2 to 1.6 km) wide.
The Waco tornado of 1953 was a third of a mile wide had a path length of 23 miles. Data does not appear to be available on how long it lasted.
The Flint, Michigan tornado of June 18, 1953 was about half a mile wide.
There is no specific type or rating for a tornado of a given size, though a mile wide tornado is likely to be very strong. The general term for a very large tornado (though not necessarily a mile wide), is "wedge."
The Waco, Texas tornado traveled 20 miles and was 1/3 of a mile wide.
Mile Wide Tornado Oklahoma Disaster - 2013 TV was released on: USA: 2 June 2013
The path of a tornado is usually less than a mile wide, with most tornadoes ranging from 50 to 100 yards wide. However, some very large tornadoes are over a mile wide, and a handful of tornadoes have had paths over 2 miles wide.
An F4 tornado can be a quarter of a mile wide, but that is by no means a requirement. Tornado ratings are based on the severity of the damage, not the size of the tornado. There is a tendency for violent tornadoes to be large, but they don't have to be. A path width of 1/4 mile would not be uncommon for an F4, but sizes have ranged from as small as 100 yards to as wide as 2.5 miles.
It was just under 1 mile wide and was rated EF5.