In this article, the word that is an example of connoative language is gripped.
Connotative language is used in a symbolic or figurative way in order to communitcate information as well as feelings or sensations.
In this case, the word gripped is used to express the drastic and lasting effects the drought had in the region in the 70s. Since the drought cannot literally grip anything, the word is used to symbolize its lasting effects in the area.