The Tornado Force Scale

This scale rates the strength of tornados according to seven categories:

Tornado ( F0 )

Winds are 40 to 72 mph.

Light Damage.

Tornado ( F1 )

Winds are 73 to 112 mph.

Moderate Damage

Tornado ( F2 )

Winds are 113 to 157 mph.

Considerable Damage

Tornado ( F3 )

Winds are 158 to 206 mph.

Severe Damage

Tornado ( F4 )

Winds are 207 to 260 mph.

Devastating Damage.

Tornado ( F5 )

Winds are 261 to 318 mph.

Incredible Damage

Tornado ( F6 )

Winds are 319 and beyond.

Inconceivable Damage.