exodus 9:18 Behold, to morrow about this time I will cause it to rain a very grievous hail, such as hath not been in Egypt since the foundation thereof even until now. - Free Bible Online

      Ex 9:18-35. PLAGUE OF HAIL.

      18. I will cause it to rain a very grievous hail, &c.--The seventh plague which Pharaoh's hardened heart provoked was that of hail, a phenomenon which must have produced the greatest astonishment and consternation in Egypt as rain and hailstones, accompanied by thunder and lightning, were very rare occurrences.
      such as hath not been in Egypt--In the Delta, or lower Egypt, where the scene is laid, rain occasionally falls between January and March--hail is not unknown, and thunder sometimes heard. But a storm, not only exhibiting all these elements, but so terrific that hailstones of immense size fell, thunder pealed in awful volleys, and lightning swept the ground like fire, was an unexampled calamity.

JFB.