Vapor
'Vapor,' as in Jeremiah 10:13, signifies the ultimate truths of the church.
In Psalm 135:7, this signifies the ultimate, or most external truths of the church. (Apocalypse Explained 304[50])
In Psalm 148:8, this signifies the delights of the loves of the natural man and its external and internal knowledges. This is before a man has been reformed and made spiritual. (Apocalypse Explained 419[15])
(References: Apocalypse Explained 304)
Jeremiah 10:13
13
when he utters his voice, there is a tumult of waters in the heavens, and he causes the vapors to ascend from the ends of the earth; he makes lightnings for the rain, and brings forth the wind out of his treasuries.