▁ass essed ▁peak ▁ 1 ‑ min ute ▁wind s ▁of ▁ 1 2 0   km / h ▁( 7 5   m ph ), ▁equivalent ▁to ▁a ▁minimal ▁h urr icane . ▁By ▁that ▁time , ▁the ▁storm ▁had ▁turned ▁more ▁to ▁the ▁south - s out heast , ▁and ▁began ▁to ▁weak en ▁on ▁January   1 6 . ▁Two ▁days ▁later , ▁Al ison ▁weak ened ▁to ▁tropical ▁de pression ▁status ▁and ▁diss ip ated . ▁ ▁Trop ical ▁Cy clone ▁B ella ▁ ▁Similar ▁to ▁Al ison , ▁B ella ▁origin ated ▁on ▁January   1 8 ▁from ▁a ▁sur ge ▁in ▁the ▁mon so on ▁tr ough ▁to ▁the ▁south west ▁of ▁Sum atra . ▁For ▁several ▁days , ▁the ▁system ▁remained ▁weak ▁as ▁it ▁moved ▁generally ▁west - s outh west ward . ▁On ▁January   2 5 , ▁it ▁intens ified ▁to ▁tropical ▁storm ▁status , ▁but ▁B ella ▁took ▁three ▁more ▁days ▁to ▁intens ify ▁to ▁tropical ▁cy clone ▁status , ▁or ▁with ▁ 1 0 ‑ min ute ▁maximum ▁sust ained ▁wind s ▁of ▁ 1 2 0   km / h ▁( 7 5   m ph ). ▁The ▁cy clone ▁att ained ▁peak ▁intensity ▁on ▁January   2 9 , ▁officially ▁reaching ▁wind s ▁of ▁ 1 5 5   km / h ▁( 1 0 0   m ph ). ▁The ▁J TW C ▁uno fficial ly ▁estimated ▁wind s ▁of ▁ 2 4 0   km / h ▁(