A "double tornado" is scientifically known as a multiple vortex or multivortex tornado. In such tornadoes smaller vortices form within the main vortex of the tornado. These subvortices usually do not last long and individually do not impact the overall tornado very much. Rather than indicating a lack of organization in the tornado, a multivortex structure usually indicates a strong tornado.
The average time for a tornado to stay on the ground is around 10-15 minutes, but they can last anywhere from a few seconds to over an hour, with some particularly long-lasting tornadoes staying on the ground for hours.
Tornadoes are able to stay off the ground due to the incredibly strong updrafts and rotation within the thunderstorm that created them. These updrafts keep the tornado suspended in the air as it moves along the ground.
The tornado is reported to have had a path length of 27 miles and an average forward speed of 35 mph, which works out to a duration of 46 minutes.
It varies widely. The average tornado is on the ground for about 8 kilometers. But some tornadoes are only on the ground for a few meters. At the other end, other tornadoes have had damage paths hundreds of kilometers long. The longest tornado damage path on record is 352 kilometers.
By the meteorological definition a tornado extends from cloud base to the ground. If it does not, it cannot produce damage. However, just because the visible funnel doesn't touch the ground doesn't mean the strong winds don't. It is the vortex of wind which defines a tornado, not the funnel.
several minutes or hours
The average time for a tornado to stay on the ground is around 10-15 minutes, but they can last anywhere from a few seconds to over an hour, with some particularly long-lasting tornadoes staying on the ground for hours.
Tornadoes are able to stay off the ground due to the incredibly strong updrafts and rotation within the thunderstorm that created them. These updrafts keep the tornado suspended in the air as it moves along the ground.
The duration of a tornado can vary greatly, from just a few seconds to several hours. The length of time a tornado stays on the ground depends on various factors such as the speed at which it is moving, the strength of the tornado, and the terrain it encounters.
You would want to go to an under ground celer where the tornado can't reach.
Tornadoes can stay on the ground for anywhere from a few seconds to more than an hour, depending on their size, strength, and the terrain they encounter. The average duration of a tornado on the ground is about 10 minutes.
The average tornado lasts about 10 minutes. However, duration can vary greatly. Some tornadoes last only a few seconds. In rare cases a tornado can be on the ground for an hour of more. The infamous Tri-State tornado of 1925 is believed to have been on the ground for over three and a half hours.
A tornado that does not touch the ground is a funnel cloud.
A funnel cloud that touches the ground is commonly known as a tornado.
A tornado that doesn't touch the ground isn't a tornado; it is a funnel cloud. However if the funnel is pulling debris off the ground or making some other type of contact with the ground it is a tornado.
If there is a tornado emergency, you need to seek shelter immediately. Always seek shelter in a basement or other place low to the ground. Try to stay somewhere where there are no windows.
A tornado often appears dark were it is touching the ground be cause the powerful winds of the tornado lift dirt from the ground.