Fujita Classification of Tornadoes

Wind SpeedLength
Force Damagekm/hmphkmmi
  1. light
  2. moderate
  3. considerable
  4. severe
  5. devastating
  6. incredible
  7. * inconceivable
 64-116
117-180
181-253
254-331
332-418
419-512
513-611		 40-72
73-112
113-157
158-206
207-260
261-318
319-380		 <1.6
1.6-4.8
4.8-16
16-50
50-159
159-507
507-1,607		 <1
1-3
3-10
10-31
31-99
99-315
315-999
*Only theoretical; has never reached this level.