How does a tornado start?

How does a landspout tornado start?

• Answer:

  Known officially as tornadoes" by the National Weather Service, they form during the growth stage of convective clouds by the ingestion and tightening of boundary layer vorticity by the tower's updraft. most often occur in drier areas with storms and considerable instability. They generally are smaller and weaker than tornadoes, though many persist in excess of 15 minutes and some have produced F3 damage. They bear an appearance and generative mechanism highly similar to that of waterspouts, usually taking the form of a translucent and highly laminar helical tube. Like waterspouts, they are also technically considered tornadoes since they are defined by an intensely rotating column of air in contact with both the surface and a cloud. Not all are visible, and many are first sighted as debris swirling at the surface before eventually filling in with condensation and dust.