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.
Tornadoes start as a funnel cloud, becoming a tornado when they reach the ground.
A tornado that does not touch the ground is a funnel cloud.
No particular sky color necessarily indicates tornado activity. It is commonly state that a greenish sky indicates a tornado, but it doesn't need to be gray for a tornado to occur, nor does a green sky necessarily mean there is a tornado, just a severe thunderstorm. In a tornadic storm the clouds may appear green, gray, yellow, or black.
Yes
The Tuscaloosa-Birmingham tornado of 2011 was on the ground for about 90 minutes.
The tornado is a twister before it hits the ground, it just spins in the sky, kind of
The "fire tornado" forms from the fire; it doesn't really matter how the fire starts. Also, a "fire tornado" is more properly called a fire whirl as it technically isn't a tornado.
A tornado is considered a tornado when it reaches the ground
Tornadoes start as a funnel cloud, becoming a tornado when they reach the ground.
A tornado that does not touch the ground is a funnel cloud.
A tornado becomes a tornado when the circulation reaches the ground.
No particular sky color necessarily indicates tornado activity. It is commonly state that a greenish sky indicates a tornado, but it doesn't need to be gray for a tornado to occur, nor does a green sky necessarily mean there is a tornado, just a severe thunderstorm. In a tornadic storm the clouds may appear green, gray, yellow, or black.
A tornado often appears dark were it is touching the ground be cause the powerful winds of the tornado lift dirt from the ground.
tornado
Yes
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.
The intensity of a tornado is rated based on damage done on the ground.