In the movie, several tornadoes devastate Los Angeles' downtown and the surrounding area. Although it's not mentioned by any character, a tornado is measured by its destructive force with the Fujita's Scale. It was named after Tetsuya Fujita, who in 1971, in collaboration with Allan Pearson, created a scale to differentiate a twister according the wind speed: F0: 60-117 km/h or 45- 72 mph (light damage). F1: 117-181 km/h or 73-112 mph (moderate damage). F2: 181-250 km/h or 113-157 mph (significant damage). F3: 250-320 km/h or 158-206 mph (severe damage). F4: 320-420 km/h or 207-260 mph (devastating damage). F5: 420-510 km/h or 261-308 mph (incredible damage). F6: 510-610 km/h or 309-379 mph

Film

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