So let's break down the verse of Matthew 24
1.) Matthew 24:30 (a) “Then will appear the sign of the Son of Man in heaven.
What is the sign of the son man, and can people from earth, see it in heaven?
2.) Matthew 24:30 9 (b) And then all the peoples (φυλαὶ) of the earth (γῆς)
c will mourn
Note, that all the peoples of the earth can be translated as all the tribes of the land. In the Septuagint, the greek root words for 'land/earth' and 'peoples/tribes/families' found in zechariah 12, are from the same greek root words used in matthew 24:30
Zechariah 12:12 καὶ κόψεται ἡ
γῆ κατὰ
φυλὰς φυλάς· φυλὴ οἴκου Δαυὶδ καθ᾿ ἑαυτὴν καὶ αἱ γυναῖκες αὐτῶν καθ᾿ ἑαυτάς, φυλὴ οἴκου Νάθαν καθ᾿ ἑαυτὴν καὶ αἱ γυναῖκες αὐτῶν καθ᾿ ἑαυτάς
,
And the land shall lament in separate families, the family of the house of David by itself, and their wives by themselves; the family of the house of Nathan by itself, and their wives by themselves;
So it is definitely appropriate to interpret this as all the families/tribes of the land, specifically, Israel, as Jesus is drawing from this prophecy.
3.) Matthew 24:30 (c) when they
see the Son of Man coming on the clouds of heaven, with power and great glory
The definition of the greek word for see is: 3708 horáō – properly, see, often with metaphorical meaning: "to see with the mind" (i.e. spiritually see), i.e. perceive (with inward spiritual perception). It can mean: I see, look upon, experience, perceive, discern, beware.
A better translation of Matthew 24:30 would be:
"Then will appear the sign of the son of man in heaven, and then all the tribes/families of the land (of Israel) will mourn when they perceive/understand/spiritually discern, the son of man coming on the clouds with power"
It is also important that we understand the OT language of the coming of God in order to understand that by Jesus saying he was coming on the clouds, he is proclaiming that he is God:
Did God literally part the heavens, come down with his feet on the clouds, mount on a cherubim, and fly around earth when he delivered David from his enemies and from the hand of saul?
2 Samuel 22:1, 10-11
David sang to the Lord the words of this song when the Lord delivered him from the hand of all his enemies and from the hand of Saul.
He parted the heavens and came down; dark clouds were under his feet. He mounted the cherubim and flew; he soared
d on the wings of the wind.