Revelation Chapter 16 describes the seven bowl judgments that are poured out during the additional 30 days at the end of Daniel's 70th Week. See Dan 12:11. During this time, God judges the Earth, Antichrist and his followers, and the unholy city of Mystery Babylon. The bowl judgments act to purge and cleanse the Earth of man's destruction and sin, which have defiled the Earth since Adam and Eve were expelled from the Garden of Eden.
The seven bowl judgments will occur with machine gun-like rapidity; a bowl will be poured out approximately every four days. The bowl judgments will produce unimaginable destruction and devastation of the Earth. This will be the most powerful demonstration of God's wrath the world will ever see. John describes each of these bowl judgments in detail, as follows:
The Seven Bowl Judgments:
The First Bowl - Boils on the skin of Antichrist's followers
The Second Bowl - Salt waters turn to blood
The Third Bowl - Fresh waters turn to blood
The Fourth Bowl - Scorching Heat from the Sun
The Fifth Bowl - Jerusalem is plunged into darkness
The Sixth Bowl - The Euphrates is dried up
The Seventh Bowl - The Devastation Earthquake
In Revelation Chapter 16, we also learn of the preparation process, as the world gets ready for Armageddon. Specifically, Antichrist will call forth three frog-like demons to rally the forces of evil together for a final confrontation with Christ in Israel at Armageddon. The frog demons will call upon the kings of Antichrist's Empire, who will march their troops through the dried Euphrates to Jerusalem.
The seven bowl plague judgments are similar to the plagues on Egypt. However, the bowl judgments are more severe and they extend to the entire earth (the Trumpet judgments extended to only one-third of the earth). This judgment is beyond anything ever mentioned before in Scripture.