Jesus is coming again - Revelation 1:7
Behold, he cometh with clouds; and every eye shall see him, and they also which pierced him: and all kindreds of the earth shall wail because of him. Even so, Amen.
Jesus is coming back to earth in the clouds. When Jesus returns, it will not be local or invisible, as every eye will see Him. All the people of the earth will be plunged into mourning because He will come to judge His enemies and set up His kingdom. Notice the contrast – believers do not dread the return of Christ nor will they mourn when Christ returns.