Harvey developed to the east of the Windward Islands, reaching tropical storm status on 17 August until 1 September 2017 (Fig. 2). It passed over the Caribbean Sea from 17 to 23 August and began to rapidly intensify on 24 August, becoming a hurricane the same day. Moving generally northwest, Harvey further intensified on 25 August to become a major hurricane of Category 4 intensity. Hours later, Harvey made
landfall near Rockport, Texas, at peak intensity. The increase in strength and size meant that even after landfall, its circulation extended well out over the Gulf, where a continual flow of moisture fed and prolonged the storm, long after most storms would have died. [P. Klotzbach (personal communication 2018) found in a study that the median time of Texas landfalling hurricanes before weakening below tropical storm strength is 27 hours.]
Certainly, the track of Harvey was unusual but it was likely governed mostly by the synoptic weather situation.