7 Look, he is coming with the clouds, and every eye will see him, even those who pierced him; and all the peoples of the earth will mourn because of him. So shall it be! Amen.
11 "Men of Galilee," they said, "why do you stand here looking into the sky? This same Jesus, who has been taken from you into heaven, will come back in the same way you have seen him go into heaven."
Jesus' will come with a shout, the voice of the archangel, and with the trumpet of God
16 For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God, and the dead in Christ will rise first. 17 After that, we who are still alive and are left will be caught up together with them in the clouds to meet the Lord in the air. And so we will be with the Lord forever. 18 Therefore encourage each other with these words.
He will come at a day and hour no one knows
Matthew 24:36, 44
36 "No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father.
44 So you also must be ready, because the Son of Man will come at an hour when you do not expect him.
His coming will follow the witness of the Gospel to every nation.
14 And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come.
His coming will follow the revealing of the antichrist and a great apostasy.
II Thessalonians 2:1-8
1 Concerning the coming of our Lord Jesus Christ and our being gathered to him, we ask you, brothers, 2 not to become easily unsettled or alarmed by some prophecy, report or letter supposed to have come from us, saying that the day of the Lord has already come. 3 Don't let anyone deceive you in any way, for that day will not come until the rebellion occurs and the man of lawlessness is revealed, the man doomed to destruction. 4 He will oppose and will exalt himself over everything that is called God or is worshiped, so that he sets himself up in God's temple, proclaiming himself to be God. 5 Don't you remember that when I was with you I used to tell you these things? 6 And now you know what is holding him back, so that he may be revealed at the proper time. 7 For the secret power of lawlessness is already at work; but the one who now holds it back will continue to do so till he is taken out of the way. 8 And then the lawless one will be revealed, whom the Lord Jesus will overthrow with the breath of his mouth and destroy by the splendor of his coming.
His coming will follow a time of tribulation
21 For then there will be great distress, unequaled from the beginning of the world until now-- and never to be equaled again. 22 If those days had not been cut short, no one would survive, but for the sake of the elect those days will be shortened.
His coming will be accompanied by signs in the sky
29 "Immediately after the distress of those days "'the sun will be darkened, and the moon will not give its light; the stars will fall from the sky, and the heavenly bodies will be shaken.'
The church will be gathered at the time of the signs in the sky
29 "Immediately after the distress of those days "'the sun will be darkened, and the moon will not give its light; the stars will fall from the sky, and the heavenly bodies will be shaken.' 30 "At that time the sign of the Son of Man will appear in the sky, and all the nations of the earth will mourn. They will see the Son of Man coming on the clouds of the sky, with power and great glory. 31 And he will send his angels with a loud trumpet call, and they will gather his elect from the four winds, from one end of the heavens to the other.
In Revelation 6 we see the signs in the sky, and people hiding from Christ, followed immediately in Revelation 7 by the church in Heaven.
12 I watched as he opened the sixth seal. There was a great earthquake. The sun turned black like sackcloth made of goat hair, the whole moon turned blood red, 13 and the stars in the sky fell to earth, as late figs drop from a fig tree when shaken by a strong wind. 14 The sky receded like a scroll, rolling up, and every mountain and island was removed from its place. 15 Then the kings of the earth, the princes, the generals, the rich, the mighty, and every slave and every free man hid in caves and among the rocks of the mountains. 16 They called to the mountains and the rocks, "Fall on us and hide us from the face of him who sits on the throne and from the wrath of the Lamb! 17 For the great day of their wrath has come, and who can stand?"
9 After this I looked and there before me was a great multitude that no one could count, from every nation, tribe, people and language, standing before the throne and in front of the Lamb. They were wearing white robes and were holding palm branches in their hands. 10 And they cried out in a loud voice: "Salvation belongs to our God, who sits on the throne, and to the Lamb."
Many will be caught unprepared and will perish
37 As it was in the days of Noah, so it will be at the coming of the Son of Man. 38 For in the days before the flood, people were eating and drinking, marrying and giving in marriage, up to the day Noah entered the ark; 39 and they knew nothing about what would happen until the flood came and took them all away. That is how it will be at the coming of the Son of Man.
Jesus will come in power to smite the nations
11 I saw heaven standing open and there before me was a white horse, whose rider is called Faithful and True. With justice he judges and makes war. 12 His eyes are like blazing fire, and on his head are many crowns. He has a name written on him that no one knows but he himself. 13 He is dressed in a robe dipped in blood, and his name is the Word of God. 14 The armies of heaven were following him, riding on white horses and dressed in fine linen, white and clean. 15 Out of his mouth comes a sharp sword with which to strike down the nations. "He will rule them with an iron scepter." He treads the winepress of the fury of the wrath of God Almighty. 16 On his robe and on his thigh he has this name written: KING OF KINGS AND LORD OF LORDS.