▁as ▁Trop ical ▁Cy clone ▁ 0 8 S . ▁Dor ina ▁quickly ▁intens ified ▁into ▁a ▁tropical ▁cy clone ▁by ▁January   2 1 , ▁developing ▁a ▁ 4 0   km ▁( 2 5   mi ) ▁eye ▁in ▁the ▁center ▁of ▁the ▁con ve ction . ▁Later ▁that ▁day , ▁the ▁storm ▁became ▁an ▁inten se ▁tropical ▁cy clone , ▁less ▁than ▁three ▁days ▁after ▁its ▁development ; ▁such ▁a ▁quick ▁time ▁to ▁att ain ▁that ▁intensity ▁is ▁unusual ▁for ▁the ▁bas in . ▁At ▁ 1 8 : 0 0   UTC ▁on ▁January   2 1 , ▁Dor ina ▁att ained ▁peak ▁wind s ▁of ▁ 1 7 5   km / h ▁( 1 1 0   m ph ), ▁according ▁to ▁the ▁M FR , ▁and ▁ 1 8 5   km / h ▁( 1 1 5   m ph ) ▁according ▁to ▁the ▁J TW C . ▁ ▁After ▁moving ▁over ▁an ▁area ▁of ▁cool er ▁waters , ▁Dor ina ▁began ▁weak ening , ▁indicated ▁by ▁the ▁previously ▁well - defined ▁eye ▁becoming ▁ra gg ed . ▁On ▁January   2 4 , ▁the ▁cy clone ▁weak ened ▁into ▁a ▁severe ▁tropical ▁storm . ▁The ▁motion ▁became ▁more ▁west - s outh w ester ly ▁after ▁the ▁r idge ▁weak ened . ▁A ▁passing ▁tr ough ▁increased ▁she ar ▁over ▁Dor ina , ▁which ▁caused ▁further ▁weak ening ▁and ▁for ▁the ▁con ve ction ▁to ▁d eter ior ate . ▁However , ▁conditions ▁became