An east wind - See Exodus 10:4. Moses is careful to record the natural and usual cause of the evil, portentous as it was both in extent and in connection with its denouncement.
Related Commentaries of Exodus 10:13
Exodus 10:13
13 And Moses stretched forth his rod over the land of Egypt, and the LORD brought an east wind upon the land all that day, and all that night; and when it was morning, the east wind brought the locusts.