![]() ![]() An F1 tornado was a weak tornado and an F5 tornado was a violently strong tornado. The possible tornado intensity ratings were F0, F1, F2, F3, F4 and F5. On the decommissioned Fujita Scale, tornadoes were also given one of six ratings.Prior to February 1st, 2007, tornadoes were rated using the Fujita Scale (F-Scale) created by Ted Fujita and Allen Pearson.An EF0 is a weak tornado and an EF5 is a violently strong tornado. The possible tornado intensity ratings are EF0, EF1, EF2, EF4 and E5. On the Enhanced Fujita Scale, tornadoes are given one of six ratings.Tornadoes are rated using the Enhanced Fujita Scale (EF-Scale) which rates tornadoes by the damage they cause.states within or have parts within tornado alley are Iowa, Kansas, Nebraska, Oklahoma, South Dakota, and Texas. In the United States, most tornadoes occur within a region known as tornado alley.The United States experiences 1,200+ tornadoes on average every year, more than all other countries combined.On average, there are over 2,000 tornadoes each year, with the most occurring in North America and Europe.Strong low-level rotation detected by Doppler weather radar can also be cause for issuing a tornado warning. A tornado warning is issued by meteorologists when a funnel cloud or tornado has been reported.A tornado watch is issued by meteorologists when the weather conditions are favorable for tornado formation.A tornado outbreak occurs when single weather system produces multiple tornadoes. ![]()
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