3 0 , ▁the ▁National ▁H urr icane ▁Center ▁( N HC ) ▁began ▁monitoring ▁an ▁area ▁of ▁dist urbed ▁weather , ▁perhaps ▁in ▁connection ▁to ▁a ▁tropical ▁wave , ▁several ▁hundred ▁miles ▁south ▁of ▁sout he astern ▁Mexico ▁for ▁tropical ▁development ▁within ▁a ▁five - day ▁period . ▁Within ▁an ▁increasing ly ▁favor able ▁environment ▁for ▁formation , ▁the ▁disturb ance ▁was ▁assigned ▁a ▁medium ▁chance ▁of ▁becoming ▁a ▁tropical ▁cy clone ▁within ▁the ▁next ▁ 4 8 ▁hours ▁later ▁that ▁day , ▁and ▁a ▁high ▁chance ▁of ▁development ▁on ▁May   3 1 ▁as ▁it ▁became ▁increasing ly ▁better ▁organized . ▁In ▁conj unction ▁with ▁a ▁ship ▁observation ▁and ▁satellite ▁intensity ▁estimates , ▁the ▁disturb ance ▁acquired ▁enough ▁organization ▁to ▁be ▁de emed ▁a ▁tropical ▁de pression ▁at ▁ 2 1 0 0   UTC ▁on ▁June   2 . ▁ ▁Over ▁the ▁subsequent ▁hours ▁after ▁its ▁formation , ▁little ▁change ▁in ▁organization ▁was ▁noted , ▁with ▁multiple ▁low - level ▁cent ers ▁rot ating ▁within ▁a ▁bro ader ▁circul ation ▁position ed ▁on ▁the ▁south ▁side ▁of ▁the ▁deep est ▁con ve ction . ▁However , ▁a ▁pair ▁of ▁Advanced ▁Sc atter ometer ▁( AS CAT ) ▁passes ▁early ▁on ▁June   3 ▁revealed ▁sust ained ▁wind s ▁just ▁above ▁the ▁tropical ▁storm ▁threshold , ▁and ▁the ▁de pression ▁was ▁subsequently ▁upgrad ed ▁to ▁Trop ical ▁Storm ▁Bor is . ▁Despite ▁initial ▁forec asts ▁of ▁several ▁days ▁over ▁water , ▁the ▁center ▁of ▁circul ation ▁moved ▁quickly ▁north ward ▁in