Tornadoes happen in Miami for the same reason they happen anywhere else. See the related question for how tornadoes form in general.
This actually did happen at least once. On May 12, 1997 Miami, Florida was hit by an F1 tornado. There was moderate damage to trees and buildings. Fortunately strong tornadoes are rare in Florida.
An area the size of a city is too small for any comprehensive tornado statistics. Miami itself has been hit by tornadoes as strong as F1 while areas not far from the city have had tornadoes up to F3 strength. This means that while strong tornadoes have not struck the city in recent history, it can still happen. As with all areas, most tornadoes in Florida are weak with strong ones occurring less frequently.
Tornadoes can happen in any place that gets thunderstorms.
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.
Tornadoes can happen in Ottawa. Canada does get tornadoes, though not as often as the U.S. due to its cooler climate.
Tornadoes can happen anywhere in the world except cold areas like Antarctica and the north pole. Tornadoes are mostly common in United States.
Yes. Tornadoes, including some significant ones, can and do happen the the Philippines.
Tornadoes happen in the summer every year.
Most tornadoes in the U.S. happen in spring and early summer.
Tornadoes can happen anywhere - they're usually formed from severe thunderstorms.
Sicily Tornadoes happened in 1851.
well tornadoes can happen anywhere any time so yes