What share of tornadoes are weak?

81.4% of rated tornadoes since 1950 reached no higher than F1 or EF1. Tornadoes of F4 or stronger are 0.9% of the total and account for 61.4% of the deaths.

At each rating

Share of F0 to F1 and EF0 to EF1 among rated tornadoes by decade, percent

Tornadoes at each rating

F0 or EF0	33,329	46.3	24	1.2	30
F1 or EF1	25,179	35.0	254	3.4	60
F2 or EF2	10,079	14.0	671	7.3	100
F3 or EF3	2,669	3.7	1,498	15.3	200
F4 or EF4	596	0.8	2,542	28.4	440
F5 or EF5	60	0.1	1,350	38.5	592