Before it reaches the ground a developing tornado is known as a funnel cloud.
Before it reaches the ground a developing tornado is known as a funnel cloud.
Before it reaches the ground, the precursor to a tornado is called a funnel cloud.
A tornado is considered a tornado when it reaches the ground
A funnel cloud.
A tornado becomes a tornado when the circulation reaches the ground.
It becomes a tornado, obviously.
No. A tornado starts in the clouds and extends towards the ground. Until it reaches the ground it is not a tornado but a funnel cloud.
When a tornado first reaches the ground and becomes a tornado it is said to have touched down.
A funnel cloud is a developing tornado that has not reached the ground.
Yes, a tornado is not considered a tornado unless it reaches the ground.
Not technically. It is the beginning of a tornado, but they are categorized differently. It is not considered a tornado until it reaches the ground with damaging winds.
In this case it can be confirmed that the tornado has touched down. The funnel of a tornado does not have to touch down for the tornado to do so, and the vortex actually reaches the ground before the funnel does. The circulation reaching the ground is a more significant event. When the vortex is aloft its updraft can draw in air from directly below. This is no longer possible when the circulation reaches the ground. Since air can no longer be drawn in from below the pressure inside the vortex drops, causing the wind in it to intensify.