▁List ▁of ▁ 2 1 st - century ▁Canadian ▁torn ado es ▁and ▁torn ado ▁out break s ▁ ▁List ▁of ▁North ▁American ▁torn ado es ▁and ▁torn ado ▁out break s ▁ ▁List ▁of ▁dere cho ▁events ▁ ▁List ▁of ▁tropical ▁cycl ones ▁ ▁T orn ado ▁clim at ology ▁ ▁T orn ado ▁intensity ▁ ▁T orn ado ▁myth s ▁ ▁T orn ado ▁records ▁▁ ▁References ▁▁ ▁Gra z ul is , ▁Thomas ▁P . ▁( 1 9 9 3 ). ▁Sign ific ant ▁T orn ado es ▁ 1 6 8 0 - 1 9 9 1 , ▁A ▁Chron ology ▁and ▁Analysis ▁of ▁Events . ▁St . ▁Joh ns bury , ▁V T : ▁The ▁T orn ado ▁Project ▁of ▁Environment al ▁Films . ▁▁ ▁--- ▁( 1 9 9 7 ). ▁Sign ific ant ▁T orn ado es ▁Update , ▁ 1 9 9 2 - 1 9 9 5 . ▁▁ ▁--- ▁( 2 0 0 1 ). ▁The ▁T orn ado : ▁Nature ' s ▁Ult imate ▁Wind st orm . ▁Norman , ▁OK : ▁University ▁of ▁Oklahoma ▁Press . ▁▁ ▁National ▁Ocean ic ▁and ▁At mos pher ic ▁Administration , ▁National ▁Cl im atic ▁Data ▁Center ▁/ ▁Storm ▁Pred iction ▁Center . ▁Storm ▁Data ' '. ▁ ▁External ▁links ▁ ▁Sign ific ant ▁events ▁ ▁Web sites ▁D edic ated ▁to ▁Specific ▁T orn ado ▁Events ▁( SP C , ▁NO AA ) ▁ ▁World ▁W ide ▁T orn ado es ▁( T orn