How to make a tornado?

The method of homemade tornado is as follows:

First, the self-made method

1. Add water and pigment into the plastic bottle and stir evenly with a wooden stick.

2. Punch two holes at the same position above the bottle cap, butt the two bottles and fix them with adhesive tape.

Shake the bottle with water on it, and a small vortex appears in the water, just like a mini tornado.

Second, a brief introduction to tornadoes

Tornado is a vertical hollow or funnel-shaped rotating airflow between the bottom of cumulus and the underlying surface, and it is a disastrous weather phenomenon at local scale.

Tornadoes can be found in tropical and temperate regions, including the interior of the United States, western Australia and northeastern India. Tornadoes can occur in spring, summer and autumn, but most often occur in the transitional season of spring and summer or at the turn of summer and autumn (April ~ 10). Tornadoes can be divided into multi-vortex tornadoes, land tornadoes, waterspouts and so on. According to their shape and production environment.

Tornadoes usually have a wind speed of 30 to130m per second, a diameter of less than 2km, an activity range of 0 to 25km and a duration of about10min. According to the enhanced Fujita scale (EF), the intensity of tornadoes can be divided into five grades. Sandstorms and fire cyclones are similar to tornadoes, but they are not tornadoes.

classify

I. Multi-vortex tornado

Multi-vortex tornado is a tornado with secondary vortex. Secondary vortices are usually generated after the main vortex contacts the underlying surface, and the number varies from 2 to 5. They revolve around the main vortex and are difficult to distinguish by observation.

The development of multi-vortex structure is related to the intensity of tornadoes, and tornadoes above EF4 are easy to develop into multi-vortex tornadoes. The formation and disappearance of secondary vortex is dynamic and usually lasts only a few minutes. The destructive power of multi-vortex tornadoes is very great.

Second, the waterspout

A waterspout is a tornado on water, usually a non-supercell tornado. Waterspouts may appear in oceans and lakes all over the world. In the United States, waterspouts usually occur on the southeast coast of the United States, especially in southern Florida and the Gulf of Mexico.

The destructive power of waterspouts is not as good as that of super-unit tornadoes, but they are still very dangerous. Hoses can overturn and destroy ships, and when they move to land, they will cause more damage. When waterspouts may be produced or are already visible in coastal waters, the National Meteorological Administration will issue a maritime warning; When the waterspout moves to land, a tornado warning will be issued.