Tornadoes in the U.S. are rated on the Enhanced Fujita scale (or the original Fujita scale fore tornadoes Prior to February 2007), which runs from EF0 at the weakest to EF5 at the strongest. Ratings are based on wind speed estimates derived from the severity of the damage done. About 60% of tornadoes are rated EF0.
Most waterspouts have a a more tubelike appearance while most land based tornadoes are more funnel shaped. This has mostly to do with the fact that most waterspouts form and are driven by a different mechanism than most land tornadoes.
There was never a "mother ship tornado." The thunderstorms that most often spawn tornadoes, called supercells, will sometimes take on a "mothership" shape, with clouds that appear to consist of stacked disks. Without more specific information, is is impossible to know which event this question refers to.
Actually it is called tornado alley. It is the wide strip in the Midwest of the US where tornadoes are most likely to form.
There is flooding, that kills the most people, the wind can bring trees down and they can also make tornadoes
Tornadoes don't have names, hurricanes do, and Iowa does not get hurricanes. Tornadoes are referred to by where they hit in most cases. For example, one of the worst tornadoes to hit Iowa in recent years was the Parkersburg tornado, which destroyed part of the town of Parkersburg.
There were 51 tornadoes in Iowa in 2011.
There were 105 tornadoes in Iowa in 2008.
There were 33 confirmed tornadoes in Iowa in 2010.
The center part of the U.S. from Texas to Iowa has the most tornadoes. Florida is also a hot spot.
There were 33 confirmed tornadoes in Iowa in 2010.
There were 105 tornadoes that hit Iowa in 2008.
Tornadoes are most common in the region called Tornado Alley, which stretches roughly from Texas to South Dakota and Iowa.
Oklahoma has had the most F4 and F5 tornadoes. Though it is tied with Texas, Iowa, and Alabama in terms of F5 tornadoes in the past 60 years.
Tornadoes can occur in almost any biome, but appear to be most common in grassland regions.
Tornadoes appear to be most common in the eastern and central portions of North Carolina.
There have been three tornadoes in Davenport Iowa since records began in 1950.