For I believe they are portentous things Unto the climate that they point upon.
From Casca's recount, Shakespeare presents a chaotic backdrop: "For I believe they are portentous things unto the climate that they point upon", in which connotations to the severe weather is utilised to foreshadow the political turmoil to unfold. Furthermore, atmosphere is created through "portentous things" to illustrate an ominous premonition, wherein the gods are displeased with the conspirators' plotting.