is the size of a tornado directly related to the intensity of the tornado
Tornado intensity Tornadoes vary in intensity regardless of shape, size, and location, though strong tornadoes are typically larger than weak tornadoes. The association with track length and duration also varies, although longer track (and longer lived) tornadoes tend to be stronger.[3] In the case of violent tornadoes, only a small portion of the path area is of violent intensity; most of the higher intensity is from subvortices.[4] In the United States, 80% of tornadoes are EF0 and EF1 (T0 through T3) tornadoes. The rate of occurrence drops off quickly with increasing strengthâ€”less than 1% are violent tornadoes (EF4, T8 or stronger).[5]
Tornadoes in the United States Although favorable conditions for tornadoes in the United States can occur at any time, they are most common in spring and least common in winter.[5][6] Because spring is a transitional period for the climate, there are more chances of cooler air meeting with warmer air, resulting in more thunderstorms. Tornadoes can also be spawned by landfalling tropical cyclones, which usually occur in late summer and autumn. In the United States, thunderstorms capable of producing tornadoes usually form when the temperature is at its highest, typically from 4:00 p.m. to 7:00 p.m.[6][7]