The words of Limhi in verses 29-31 are not found in the Old Testament. He is probably quoting an Old Testament prophecy contained on the brass plates. The pattern of the prophecy is consistent with other Hebrew prophets. There is parallelism between verses 30 and 31. The Hebrew idiom, the east wind, is used. This phrase means a destruction or a famine. From Easton's Bible Dictionary, "In Palestine this wind blows from a burning desert, and hence is destitute of moisture necessary for vegetation."
"The east wind is a destructive wind which originates in the east, the symbolic direction of Deity's presence. Also called 'the wind of the Lord' (Hosea 13:15), it is 'prepared' by God (Jonah 4:8) for the purpose of destroying the ungodly and unrighteous. The Lord has stated, 'If my people shall sow filthiness they shall reap the east wind, which bringeth immediate destruction' (Mosiah 7:31). Hence they are 'smitten with the east wind' (Mosiah 12:6; see also Job 27:21)." (Donald W. Parry, Joseph Fielding McConkie, A Guide to Scriptural Symbolism, p. 45)