▁Africa ▁on ▁August   2 8 . ▁Similar ▁to ▁the ▁setup ▁that ▁spawn ed ▁Ir win , ▁the ▁northern ▁half ▁of ▁the ▁wave ▁f ract ured ▁and ▁led ▁to ▁the ▁formation ▁of ▁H urr icane ▁Maria , ▁whereas ▁the ▁southern ▁part ▁of ▁the ▁wave ▁continued ▁into ▁the ▁eastern ▁Pacific ▁on ▁September   4 . ▁The ▁disturb ance ▁initially ▁changed ▁little ▁in ▁organization ; ▁an ▁increase ▁in ▁con ve ction ▁on ▁September   1 2 , ▁however , ▁a ided ▁in ▁the ▁formation ▁of ▁a ▁tropical ▁de pression ▁by ▁ 0 0 : 0 0   UTC ▁that ▁day . ▁A ffect ed ▁by ▁moder ate ▁e aster ly ▁she ar , ▁the ▁de pression ▁failed ▁to ▁intens ify ▁into ▁Trop ical ▁Storm ▁J ova ▁until ▁ 0 0 : 0 0   UTC ▁on ▁September   1 5 . ▁The ▁cy clone ▁intens ified ▁at ▁a ▁faster ▁rate ▁there after , ▁att aining ▁h urr icane ▁intensity ▁early ▁the ▁next ▁day ▁as ▁it ▁turned ▁west - s outh west . ▁J ova ▁crossed ▁into ▁the ▁central ▁Pacific ▁early ▁on ▁September   1 8 , ▁where ▁environmental ▁conditions ▁fav ored ▁continued ▁intens ification . ▁As ▁the ▁storm ▁moved ▁into ▁the ▁bas in , ▁it ▁ab rupt ly ▁turned ▁north west ▁toward ▁a ▁weak ness ▁in ▁the ▁subt rop ical ▁r idge . ▁ ▁Near by ▁dry ▁air ▁acted ▁to ▁tempor arily ▁but ▁significantly ▁weak en ▁J ova ' s ▁spir al ▁band ing ▁despite ▁a ▁favor able ▁upper - level ▁environment . ▁By ▁