In a few cases there have been as many as 13 tornadoes on the ground at the same time in different locations.
About 1% of thunderstorms produce tornadoes.
No. Most tornadoes in the northern hemisphere spin counterclockwise in the northern hemisphere. Most southern hemisphere tornadoes spin clockwise. There are also anticyclonic tornadoes, which spin in the opposite direction than is normal for their hemispheres. Only about .1% to 1% of tornadoes are anticyclonic.
Less than 1% of thunderstorms produce tornadoes.
Both. Most tornadoes turn counterclockwise if in the northern hemisphere and clockwise if in the southern. There is also a small percentage of tornadoes (less than 1%) that turn in the opposite direction from what is normal in their hemisphere.
Unlike in the United States, tornadoes in Australia do not kill people every year. It appears that the last time a killer tornado hit Australia was 1990. Records seem to indicate 1 killer tornado in Australia every 5 to 20 years in the later half of the 20th Century.
1 - 2 a year.
About 1% of thunderstorms produce tornadoes. That translates to about 1,000 tornadic storms each year.
Phoenix averages less than 1 tornado per year.
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.
Up through May 1 the United States had 913 tornadoes in 2011 (out of 1692 for the whole year). Worldwide figures are not available.
Tornadoes do not occur in Miami every year. Since 1950 Miami has had 27 tornadoes, which suggests an average of a little less than 1 tornado every 2 years.
It varies widely. Tornado distribution is not even throughout the year and many days go without any tornadoes. The most tornadoes recorded in 1 day is 207 on April 27, 2011. Many tornadoes occur in outbreaks, like this, only smaller. However, for the U.S. given that it has about 1,200 tornadoes in an average year and each year has 365 days, the works out to a mean 3 to 4 tornadoes per day
It varies widely, but since the U.S. averages 1200 tornadoes in 1 year, it would average 2400 in 2 years. Worldwide figures are not available as many countries do not keep records of their tornadoes.
There were 16 tornadoes in Nevada in the years 2000-2010
1 million
No community gets hit with tornadoes every year. Evansville has been hit by a total of 5 tornadoes since official record keeping began in 1950. This works out to an approximate average of 1 tornado every 12 years.