Strong's Hebrew #6051, ``anan, (aw-nawn') refers to a cloud (as covering the sky), i.e. the nimbus or thunder-cloud:--cloud(-y).
According to Zodhiates Lexical Aides to the Old Testament Strong's #6049 is a root intimating 'to cover'; gather clouds (Gen 9:14); to act covertly, to practice magic (Deu 18:10,14; II Kgs 21:6; Isa 2:6; 57:3; Mic 5:12); to soothsay, to divine (when used as a part.) a sorcerer, an enchanter. Belief that there's any connection between occultism and clouds has generally been abandoned.
Strong's #6050 `anan (an-an') is the Aramaic correlate to the Hebrew #6051 meaning cloud and it use is exclusively restricted to Dan 7:13.
Strong's #6051 is a noun having origin in #6049 and is a cloud (covering the sky), a thunder cloud, a crowd, a host, a very large army (Eze 30:18; 38:9) A morning cloud was used as a timage of something transient (Hos 6:4; cf. Job 7:9). About 3/4 of the occurance of #6051 refer to the pillar cloud that directed the Israelites through the desert. It represented the presence of God over the tabernacle (Exo 13; 14; 16; 33; 40; Num 9-12; 14; 16) In Num 9:15-22 alone, #6051 is used eleven times. The cloud was present in or over the Temple of Solomon (cf. I Kgs 8:10,11; II Chr 5:13,14). Clouds accompanied God's presence at Mt. Sinai (Exo 19:9, 16; 24:15,16,18; Deu 4:11; 5:22; Psa 97:2). They have eschatological importance (Eze 30:3; 32:7; Joe 2:2; Zep 1:15, cf. Dan 7:13; Mat 17:5; 24:30; 26:64; Act 1:9; I Cor 10:1,2; I Ths 4:17; Rev 1:7; 10:1; 11:12; 14:14-16)
According to Adam Clarke's Commentaries re: Lev 19:26, Nor observe times גגשה אל (alw velo teonenu), ye shall not divine by clouds, which was also a superstition much in practice among the heathens, as well as divination by the flight of birds. What these prohibitions may particularly refer to, we know not.
It is obvious, given two of Satan's titles, e.g. god & Prince of this World, and Prince of the power of the air, its clear that diviniation based on meteorological phenomena, e.g., clouds, rainbow, sundog, sun & moon halo, sun pillars, arc, etc. would prudently be shunned.
Furthermore, I believe that the context would intimate that divination of the timing of anything would be included in this admonition, e.g., the appearance of eclipses, or astronomical phenomenon such as comets & meteor showers, conjunction of planets, etc., including earthquakes, plagues, abundance or famine as being auspicious omens and portends.
Looks like “astrology” would be covered here.