They don't happen instantly, but they do certainly form quickly compared with other types of storm. This simply has to do with the scale on which they exist. In weather terms tornadoes are microscale weather patterns, referring to things that are less than a few kilometers in size. (The largest known tornado was 4 km, or 2.5 miles wide. Most are much smaller.)
Because of their small size the mechanisms behind microscale systems operate quickly, causing them to form and dissipate in minutes or seconds in most cases. In addition to tornadoes, other microscale systems include turbulence and individual cumulus clouds.
Tornadoes typically start on land, as they form due to the interaction of warm, moist air from the surface and cool, dry air aloft. However, tornadoes can also form over water if certain conditions are met, such as in the case of waterspouts.
Most tornadoes form in a region called Tornado Alley, which includes parts of the central United States like Texas, Oklahoma, Kansas, and Nebraska. This area is prone to tornadoes due to a combination of warm, moist air from the Gulf of Mexico meeting with cooler, drier air from the Rockies.
No, tornadoes do not form from areas of low pressure. Tornadoes form from rotating thunderstorms called supercells, which are unique in their structure and must have specific atmospheric conditions to produce a tornado.
Tornadoes are sometimes divided into "weak" tornadoes "strong" and "violent" tornadoes. Weak tornadoes are those rated EF0 and EF1. Most tornadoes are weak. Strong tornadoes are those rated EF2 and EF3. Violent tornadoes are those rated EF4 and EF5. They are the rarest of tornadoes, only about 1% of tornadoes are this strong.
Tornadoes are often referred to simply as "tornadoes" or "twisters."
No, they start from thunderstorms.
No. A lava flow may trigger convection, but not tornadoes.
Tornadoes start as a funnel cloud, becoming a tornado when they reach the ground.
No. Hurricanes start over water and tornadoes are on land.
Definitely Not
Humans cannot start tornadoes.
Tornadoes start up in the clouds & make their way down to touch land.
tornadoes can start in any continent except Antarctica and in the U.S the Midwest is full of rural areas and grassy lands which makes tornadoes to form often in those areas
Tornadoes can develop just about anywhere in the U.S. but are most common on the Great Plains and in the South.
Tornadoes can occur at any time of year. A few tornadoes will happen in January almost every year, with some tornadoes occurring as early as January 1.
Tornadoes can occur at any time of year but the greatest number occur in spring and early summer.
If general weather conditions favor the formation of tornadoes then a tornado watch is issued.