It appears to have been one tornado.
How many people killed
Because it doesn't get as many tornadoes as tornado alley.
Tornado Alley averages about 700 to 800 tornadoes per year.
The plural of tornado is tornadoes.
The majority of U.S. tornadoes happen in Tornado Alley. However worldwide tornadoes are found in many regions,, though a large portion of these tornadoes are not documented.
The word tornado is the singular noun. The plural noun would be tornadoes.
Tornado Alley.
No. Tornadoes are not named like hurricanes are. Many tornadoes can be referred to by the town or state that they hit, such as the Tri-State tornado or the Joplin tornado.
Tornado Alley itself is not destructive, but the tornadoes that frequent it can be. The tornadoes in Tornado Alley destroy many homes each year.
That is difficult to determine. Many of the longest official tornado tracks were actually tornado families, series of tornadoes forming in succession, rather than individual tornadoes.
The happenings of tornadoes is not limited.
It is not known. The Valletta tornado ocurred in the 1550s, long before accurate records were kept. Give the extremely high death toll, it was likely an F4 or F5, but this is a measure of intensity, not size.