What Does Exodus 10:13 Mean?

So Moses stretched out his staff over the land of Egypt, and the LORD drove an east wind upon the land all that day and all that night. When it was morning, the east wind had brought the locusts. The Locust plague arrives via an east wind that blows all day and all night.

The east wind (Hebrew: ruach kadim) in the ancient Near East was the desert wind from the Arabian desert, which blew hot, dry, and powerfully: and which carried desert locusts from their breeding areas east and south of Egypt into the Nile Delta region. YHWH uses a natural meteorological mechanism (the east wind) to accomplish the supernatural result (unprecedented locust swarms at the announced time). The theological claim is not that locusts are impossible naturally but that this swarm arrives exactly when predicted, is unprecedented in extent, and departs at Moses' prayer in a way no natural locust swarm does.

The "all that day and all that night" duration of the east wind is the delivery mechanism: a full 24-hour east wind of sufficient strength to transport a locust swarm the distance required to reach Egypt and deposit it there by morning. The precision, blow all night, swarm arrives at morning, matches the "about this time tomorrow" precision of the announcement in verse 4. YHWH does rather than predict locusts but predicts their arrival time, and the east wind is deployed to deliver them on schedule.

The use of meteorological means (east wind) for the divinely determined outcome is consistent with the hail plague's use of a natural thunderstorm (thunder, hail, lightning running along the ground) for a supernatural result. YHWH does not always bypass natural processes; he can direct natural processes to accomplish his purposes with the precision and timing that distinguishes the divinely directed from the merely natural.

The plague sequence operates through a range from direct divine action (livestock plague, boils without staff gesture) to meteorologically mediated action (hail, locust wind), demonstrating YHWH's authority over both the direct and the indirect.