The sky was alive with clouds and streaks. The sky will show signs. Signs of the devil's activity, signs of man's presence and power and end time signs of the coming of the Lord.
Eph_2:2 Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
We were subject to the prince of the power of the air, the devil and sin. God broke this power over us by coming as Jesus, the Son of God to destroy the work of the devil and to redeem us with his shed blood. He gave us a great commission.
Act 1:8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
Signs of two angels , a dead tree (the cross) and a cloud.
Act 1:9 And when he had spoken these things, while they beheld, he was taken up; and a cloud received him out of their sight.
Act 1:10 And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel;
Act 1:11 Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.
Jesus is coming in the clouds. Do you hear the sound of a trumpet?
1Co 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
1Co 15:53 For this corruptible must put on incorruption, and this mortal must put on immortality.
Luke 21:25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
Luke 21:26 Men's hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.
Luke 21:27 And then shall they see the Son of man coming in a cloud with power and great glory.
Luke 21:28 And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.